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TS4657
Single supply stereo digital audio line driver with 2.2 Vrms capless outputs
Features

Single 3.0 to 5.5 V supply for DAC and line driver Audio line output: 2.2 Vrms for all VCC range 16- to 24-bit audio data format stereo DAC, 32 to 48 kHz sample rate IS, right- or left-justified compatible digital audio interface 95 dB SNR A-weighted at 48 kHz, VCC =5 V 7.4 mA current consumption at VCC = 3.0 V, full operation Internal negative power supply to ensure ground-referenced, capless outputs No external capacitor needed for the negative power supply generation Integrated structure to suppress pop and click noise Available in thin QFN20 4 mm x 4 mm package Pin connections (top view)
VREGD GNDD 20 GNDD NC LRCLK SDAT BCLK 5 6 FORMAT2 FORMAT1 STDBY MCLK 10 GNDA 1 16 15 GNDA VREGA VCCA VOUTL 11 VOUTR GNDA VCCD NC
Description
The TS4657 is a stereo DAC that integrates a high-performance audio line driver capable of generating a 2.2 Vrms output level from a single 3.0 to 5.5 V supply. One single supply is sufficient for the digital and analog parts of the circuit, thus eliminating the need for external regulators. The TS4657 is a low-power consumption device. It features only 22 mW power dissipation at a 3.0 V power supply in full operation. A 16-bit multi-bit sigma delta DAC is used, operating at 256xFs with oversampling digital interpolation filters. The digital audio data can be 16-to 24-bit long and sample rates from 32 to 48 kHz are supported. The output stage signal is ground-referenced by using an internal self-generated negative power supply, and as such external bulky output coupling capacitors are not necessary. The TS4657 is packaged in a small 4 x 4 mm QFN20 package, ideal for portable applications.
Applications

Digital set-top boxes DVD players Digital TVs Notebooks Portable audio equipment Sound cards
March 2009
Rev 1
1/26
www.st.com 26
Contents
TS4657
Contents
1 2 3 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 3.2 3.3 3.4 3.5 Power characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Package thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 DAC and output stage performances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3.1 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Digital filter characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4.1 DAC digital filter response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical measurement curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 Serial audio interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1.1 4.1.2 Master clock and data clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Digital audio input format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 4.3
Power-management unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Recommended power-up and power-down sequences . . . . . . . . . . . . . . 21
4.3.1 4.3.2 Power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Power-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1 QFN20 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6 7
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2/26
TS4657
Block diagram and pin description
1
Block diagram and pin description
Figure 1. Block diagram
VCCA VCCD VREGD VREGA
Power management unit MCLK VOUTR
DAC
BCLK LRCLK SDAT
Digital Audio Interface
Digital filters DAC
VOUTL
Control interface
FORMAT1 FORMAT2 STDBY
GNDD
GNDA
Table 1.
Pin name GNDD NC LRCLK SDAT BCLK MCLK FORMAT2 FORMAT1 STDBY GNDA VOUTR VOUTL VCCA VREGA GNDA GNDA GNDD VREGD VCCD NC
Pin description
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 I/O Supply Function Digital ground, connected to GND
Non-connected This pin must remain non-connected. pin Digital input Digital input Digital input Digital input Digital input Digital input Digital input Supply Analog output Analog output Supply Supply Supply Supply Supply Supply Supply Channel select clock input Serial audio data input Bit clock input Master clock input Selection of the digital data audio format. Selection of the digital data audio format. Input for Standby pin. STDBY=VIL: the TS4657 is in shutdown mode. Analog ground, connect to GND. Right channel analog output Left channel analog output Main analog power supply, connected to VCCD Decoupling pin for the analog part Analog ground, connected to GND Analog ground, connect to GND Digital ground, connected to GND Decoupling pin for the digital part Main digital power supply. Connect to VCCA
Non-connected This pin must remain non-connected. pin
3/26
Block diagram and pin description Figure 2. Typical application schematics
TS4657
VCCD VCCA C2 C3
J5 VCC 1 3v to 5V5 J6 GND
VCCA VCCD 10uF/6V3
C1
1uF
1uF C4 C5 1uF
2 20
18
19
13
14
1
1uF
IC1 VCCD VCCA VREGD VREGA nc nc
LRCLK
J4
3 4 5
LRCLK SDAT BCLK MCLK
Digital Audio Interface
Digital Input
SDAT
J3 J2
Digital Filters and DACs
VOUTL
12
820 R5
R6 10K
C6 2nF2 SMB J7 J8 SMB
OUT L
BCLK MCLK J1
6
100K R1 100K R2 100K R3 100K R4
VOUTR
11
R8 10K
R7 820
C7 2nF2
OUT R
Control Interface
FORMAT1 /STDBY
Optional
TS4657
FORMAT2
GNDD GNDD GNDA GNDA GNDA
VCCD 1 2 3 1 2 3 1 2 3
JP1 JP2 JP3 Format1 Format2 /Stdby User Control
Figure 3.
Typical test schematics
VCCD VCCA C2 C3
J5 VCC J6 GND
VCCA VCCD 10uF/6V3 1
C1
1uF
1 17 10 15 16
8
7
9
Epad
1uF C4 C5 1uF
2 20
19
13
18
14
1
1uF
IC1 VCCD VCCA VREGD VREGA nc nc
LRCLK J4
Digital Input
3 4 5
LRCLK SDAT BCLK MCLK
SDAT
J3
Digital Audio Interface
Digital Filters and DACs
VOUTL
12
SMB J7 J8 SMB
OUT L
BCLK J2 MCLK J1 100K R1 100K R2 100K R3 100K R4
6
VOUTR
11
OUT R
Control Interface
FORMAT1 FORMAT2 /STDBY
TS4657
GNDD GNDD GNDA GNDA GNDA
VCCD 1 2 3 1 2 3 1 2 3
JP1 JP2 JP3 Format1 Format2 /Stdby
4/26
1 17 10 15 16
8
7
9
Epad
TS4657
Absolute maximum ratings
2
Table 2.
Symbol VCC Vi Toper Tstg Tj Rthja ESD ESD
Absolute maximum ratings
Key parameters and their absolute maximum ratings
Parameter Supply voltage (1) Digital input voltage MCLK, BCLK, LRCLK, SDAT, FORMAT1, FORMAT2, STDBY Operating free air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to ambient Human body model Machine model Latch-up immunity Lead temperature (soldering, 10 secs) Value 5.5 GND to VCC -40 to + 85 -65 to +150 150 100 2 200 Class A 260 C Unit V V C C C C/W kV V
1. All voltage values are measured with respect to ground.
5/26
Electrical characteristics
TS4657
3
3.1
Electrical characteristics
Power characteristics
Table 3.
Symbol VCC Power supply Total supply current. , Full operation, RL = 10 K vstdby 2.0 V VCC = 3.0 V VCC = 5.0 V Standby current consumption. VCC = 3 V to VCC = 5.5 V Vstdby = 0 V Vstdby = 0.8 V
VCC = 3.3 V T = 25 C (unless otherwise specified)
Parameter Min. 3.0 Typ. Max. 5.5 Unit V
ICC
7.4 8 25 50
9.5 9.8 1000 2000
mA
ICCstby
nA
3.2
Package thermal characteristics
Table 4.
Symbol Rthja
Operating conditions
Parameter Thermal resistance junction to ambient for QFN20(1) Min. Typ. 40 Max. Unit C/W
1. With heat sink surface = 125 mm2.
6/26
TS4657
Electrical characteristics
3.3
Table 5.
Symbol
DAC and output stage performances
VCC = 3.0 V to Vcc = 5.5 V, Rload = 10 k Cload = 100 pF, T = 25 C (unless otherwise specified)
Parameter Min. Typ. Max. Unit
Operating conditions
-
Audio data input format Sampling frequency Load resistor Load capacitance
16 32 5 10 100
24 48
bits kHz k
Fs RL CL
150
pF
Digital input characteristics VIL VIH Low-level input voltage High-level input voltage 2 0.8 V V
Dynamic parameters VoutRMS Full-scale output voltage swing Vin at 0 dBFS; RL RLmin; CL=100 pF 2.1 2.2 Vrms
Table 6.
Symbol
VCC = 3.3 V, Rload = 10 k Cload = 100 pF, T = 25 C (unless otherwise specified)
Parameter Min. Typ. Max. Unit
Dynamic parameters DR Dynamic range. A-weighted 16-bit data; Vin at -60 dBFS, FS = 48 kHz, Fin = 1 kHz Signal-to-noise ratio, FS = 48 kHz, Fin = 1 kHz, referred to output Vin at -6 dBFS; A-weighted, 18-bit data input Vin at -6 dBFS; unweighted, 18-bit data input Vin at 0 dBFS; A-weighted, 16-bit data input Total harmonic distortion and noise. Fin = 1 kHz Vin at -20 dBFS, 18-bit data input Vin at -6 dBFS, 18-bit data input Vin at 0 dBFS, 16-bit data input Power supply rejection ratio, Vripple = 200 mVpp F= 217 Hz F= 1 kHz 20 Hz < F < 20 kHz Channel separation. 1 kHz, Vin at 0 dBFS Output offset voltage Gain channel balance twu Wake-up time -20 -0.2 0.01 4.5 88 93 dB
SNR
89 87 87
94.5 92.5 93 72 82 81 80 71 46 100 20 0.2
dB
THD+N
74
dB
PSRR
dB
LRiso Voo
dB mV dB ms
7/26
Electrical characteristics Table 7.
Symbol DR
TS4657
VCC = 5 V, Rload = 10 k, Cload = 100 pF, T = 25 C (unless otherwise specified)
Parameter Dynamic range; A-weighted 16-bit data; measured at -60 dBFS, FS = 48 kHz, Fin = 1 kHz Signal-to-noise ratio, FS = 48 kHz, Fin = 1 kHz, referred to output Vin at -6 dBFS; A-weighted, 18-bit data input Vin at -6 dBFS; unweighted, 18-bit data input Vin at 0 dBFS; A-weighted, 16-bit data input Total harmonic distortion and noise. Fin = 1 kHz Vin at -20 dBFS Vin at -6 dBFS Vin at 0 dBFS Power supply rejection ratio, Vripple = 200 mVpp F= 217 Hz F= 1 kHz 20 Hz < F < 20 kHz Channel separation. 1 kHz, Vin at 0 dBFS Output offset voltage Gain channel balance -20 -0.2 3 0.01 4.5 Min. Typ. Max. Unit
88
93
dB
SNR
89
95 93 93 72 82.5 81.5 80 73 48 100 20 0.2 6
dB
THD+N
74
dB
PSRR
dB
LRiso Voo
dB mV dB ms
twu
Wake-up
time(1)
1. See timing diagram in application information.
3.3.1
Terminology
SNR: signal-to-noise ratio is expressed in dB. The theoretical formula is:
VH 1 SNR dB = 10 log ------------------ V noise 2
2
where Vnoise is the integrated noise from 20 Hz to 20 kHz and VH1 is the fundamental of the signal. For unweighted measurements, the SNR is given by:
SNR dB VH 1 = 10 log ---------------------------------------------------------------------20kHz
2
20Hz
u ( f ) ( v noise ( f ) ) df
2
where vnoise is the noise spectral density and u(f) is the unweighted filter transfer function (20 Hz, 20 kHz). For A-weighted measurements:
VH 1 SNR dB = 10 log ---------------------------------------------------------------------20kHz
A
2
20Hz
A ( f ) ( v noise ( f ) ) df
2
where vnoise is the noise spectral density and A(f) is the A-weighted filter transfer function.
8/26
TS4657
Electrical characteristics THD+N: total harmonic distortion and noise-to signal-ratio is expressed in dB. It is given by:
k
VHi
2
+ V noise
2
i=2 THD + N dB = 10 log -----------------------------------------------2 V outrms
where VHi is the rms value of the harmonic components. SINAD: signal and noise distortion is expressed in dB. The equation is given by:
V outrms SINAD dB = 10 log -----------------------------------------------k
2
VHi
i=2 k
2
+ V noise
2
DR: dynamic range is expressed in dB, with the following equation:
VHi
2
i=1 DR dB = 10 log ---------------------2 V noise
3.4
Digital filter characteristics
Table 8.
Symbol -
VCC = 3.3 V T= 25 C (unless otherwise specified)
Parameter Passband edge (-3 dB) Passband ripple f < 0.45 Fs Stopband attenuation f > 0.55 Fs -50 Min. Typ. 0.48Fs +/- 0.1 dB dB Max. Unit
9/26
Electrical characteristics
TS4657
3.4.1
Figure 4.
DAC digital filter response
DAC digital filter frequency response from 32 to 48 kHz Figure 5. DAC digital filter transition band from 32 to 48 kHz
Figure 6.
DAC digital filter ripple from 32 to 48 kHz
10/26
TS4657
Electrical characteristics
3.5
Figure 7.
Electrical measurement curves
Crosstalk vs. frequency Figure 8. Crosstalk vs. frequency
FS=48kHz FS=44.1kHz FS=44.1kHz FS=32kHz
FS=48kHz FS=44.1kHz FS=32kHz
FS=32kHz RL = 10k VCC = 5V VIN = 0dBFS TAMB = 25C
FS=32kHz
FS=48kHz RL = 10k VCC = 3V VIN = 0dBFS TAMB = 25C
FS=44.1kHz FS=48kHz
Figure 9.
Frequency response
Figure 10. Frequency response
FS=48kHz
FS=48kHz
FS=44.1kHz RL = 10k VCC = 3V VIN = 0dBFS TAMB = 25C
FS=44.1kHz
RL = 10k VCC = 5V VIN = 0dBFS TAMB = 25C
FS=32kHz
FS=32kHz
Figure 11. Current consumption vs. power supply voltage
Figure 12. Current consumption vs. standby voltage
FS=48kHz
FS=32kHz
FS = 48kHz FIN = 1kHz VIN = 0dBFS RL = 100k TAMB = 25C FS = 32kHz FIN = 1kHz VIN = 0dBFS Serial Bus = OFF
Serial Bus = ON (I2S) RL = 100k FIN = 1kHz VIN = 0dBFS TAMB = 25C
11/26
Electrical characteristics
TS4657
Figure 13. Output swing vs. power supply voltage
Figure 14. Power dissipation vs. frequency
VCC = 5V VCC = 3V3
RL = 5k, 10k or 100k FS = 32kHz, 44.1kHz or 48kHz FIN = 1kHz VIN = 0dBFS TAMB = 25C
VCC = 3V RL = 10k FIN = 1kHz VIN = 0dBFS TAMB = 25C
Figure 15. Power supply rejection ratio vs. frequency
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 20 100 1000 10000 20k

Figure 16. Power supply rejection ratio vs. frequency
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 20 100 1000 10000 20k

Figure 17. Power supply rejection ratio vs. frequency
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 20 100 1000 10000 20k

Figure 18. Signal to noise ratio vs. input level
VCC = 3V RL = 5k FS = 32kHz Input Data = 16bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
12/26
TS4657
Electrical characteristics
Figure 19. Signal to noise ratio vs. input level Figure 20. Signal to noise ratio vs. input level
VCC = 3V RL = 5k FS = 32kHz Input Data = 18bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
VCC = 3V RL = 5k FS = 48kHz Input Data = 16bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
Figure 21. Signal to noise ratio vs. input level Figure 22. Signal to noise ratio vs. input level
VCC = 3V RL = 5k FS = 48kHz Input Data = 18bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
VCC = 5V RL = 5k FS = 32kHz Input Data = 16bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
Figure 23. Signal to noise ratio vs. input level Figure 24. Signal to noise ratio vs. input level
VCC = 5V RL = 5k FS = 32kHz Input Data = 18bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
VCC = 5V RL = 5k FS = 48kHz Input Data = 16bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
13/26
Electrical characteristics
TS4657
Figure 25. Signal to noise ratio vs. input level Figure 26. Signal to noise ratio vs. input level
VCC = 5V RL = 5k FS = 48kHz Input Data = 18bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
VCC = 3V RL = 10k FS = 32kHz Input Data = 16bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
Figure 27. Signal to noise ratio vs. input level Figure 28. Signal to noise ratio vs. input level
VCC = 3V RL = 10k FS = 32kHz Input Data = 18bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
VCC = 3V RL = 10k FS = 48kHz Input Data = 16bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
Figure 29. Signal to noise ratio vs. input level Figure 30. Signal to noise ratio vs. input level
VCC = 3V RL = 10k FS = 48kHz Input Data = 18bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
VCC = 5V RL = 10k FS = 32kHz Input Data = 16bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
14/26
TS4657
Electrical characteristics
Figure 31. Signal to noise ratio vs. input level Figure 32. Signal to noise ratio vs. input level
VCC = 5V RL = 10k FS = 32kHz Input Data = 18bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
VCC = 5V RL = 10k FS = 48kHz Input Data = 16bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
Figure 33. Signal to noise ratio vs. input level Figure 34. Total harmonic distortion and noise vs. frequency
VCC = 5V RL = 10k FS = 48kHz Input Data = 18bits FIN = 1kHz LPF = 20kHz TAMB = 25C
A-Weighted
Unweighted
VCC = 3V RL = 10k FS = 32kHz Input Data = 16bits VIN = -6dBFS Unweighted LPF = 20kHz TAMB = 25C
20
20k
Figure 35. Total harmonic distortion and noise Figure 36. Total harmonic distortion and noise vs. frequency vs. frequency
VCC = 3V RL = 10k FS = 32kHz Input Data = 18bits VIN = -6dBFS Unweighted LPF = 20kHz TAMB = 25C
VCC = 3V RL = 10k FS = 48kHz Input Data = 16bits VIN = -6dBFS Unweighted LPF = 20kHz TAMB = 25C
20
20k
20
20k
15/26
Electrical characteristics
TS4657
Figure 37. Total harmonic distortion and noise Figure 38. Total harmonic distortion and noise vs. frequency vs. frequency
VCC = 5V RL = 10k FS = 32kHz Input Data = 16bits VIN = -6dBFS Unweighted LPF = 20kHz TAMB = 25C
20
20k
Figure 39. Total harmonic distortion and noise Figure 40. Total harmonic distortion and noise vs. frequency vs. frequency
VCC = 5V RL = 10k FS = 32kHz Input Data = 18bits VIN = -6dBFS Unweighted LPF = 20kHz TAMB = 25C
VCC = 5V RL = 10k FS = 48kHz Input Data = 16bits VIN = -6dBFS Unweighted LPF = 20kHz TAMB = 25C
20
20k
20
20k
Figure 41. Total harmonic distortion and noise Figure 42. Total harmonic distortion and noise vs. frequency vs. input level
VCC = 5V RL = 10k FS = 48kHz Input Data = 18bits VIN = -6dBFS Unweighted LPF = 20kHz TAMB = 25C
VCC = 3V RL = 10k FS = 32kHz Input Data = 16bits FIN = 1kHz Unweighted LPF = 20kHz TAMB = 25C
20
20k
16/26
TS4657
Electrical characteristics
Figure 43. Total harmonic distortion and noise Figure 44. Total harmonic distortion and noise vs. input level vs. input level
VCC = 3V RL = 10k FS = 32kHz Input Data = 18bits FIN = 1kHz Unweighted LPF = 20kHz TAMB = 25C
VCC = 3V RL = 10k FS = 48kHz Input Data = 16bits FIN = 1kHz Unweighted LPF = 20kHz TAMB = 25C
Figure 45. Total harmonic distortion and noise Figure 46. Total harmonic distortion and noise vs. input level vs. input level
VCC = 3V RL = 10k FS = 48kHz Input Data = 18bits FIN = 1kHz Unweighted LPF = 20kHz TAMB = 25C
VCC = 5V RL = 10k FS = 32kHz Input Data = 16bits FIN = 1kHz Unweighted LPF = 20kHz TAMB = 25C
Figure 47. Total harmonic distortion and noise Figure 48. Total harmonic distortion and noise vs. input level vs. input level
VCC = 5V RL = 10k FS = 32kHz Input Data = 18bits FIN = 1kHz Unweighted LPF = 20kHz TAMB = 25C
VCC = 5V RL = 10k FS = 48kHz Input Data = 16bits FIN = 1kHz Unweighted LPF = 20kHz TAMB = 25C
17/26
Electrical characteristics
TS4657
Figure 49. Total harmonic distortion and noise vs. input level
VCC = 5V RL = 10k FS = 48kHz Input Data = 18bits FIN = 1kHz Unweighted LPF = 20kHz TAMB = 25C
18/26
TS4657
Application information
4
4.1
4.1.1
Application information
Serial audio interface
Master clock and data clocks
Three external clock signals are applied to the TS4657. The MCLK is the external master clock applied by the audio data processor. The LRCLK is the channel frequency, also called LEFT/RIGHT clock, at which the digital words for each channel are input to the device. The LRCLK clock is the sample rate of the audio data. The ratio MCLK/LRCLK must be an integer as shown in Table 9. The BCLK is the bit clock and represents the clock at which the audio data is serially shifted into the audio port. BCLK is linked to LRCLK. The minimum required BCLK frequency is twice the audio sample rate times the number of bits in each audio word. Refer to Table 10 for the BCLK/LRCLK ratio. MCLK, LRCLK and BCLK must be synchronous clock signals. Table 9. Audio data sampling rates
MCLK (MHz) LRCLK (kHz) 256x 32 44.1 48 8.192 11.2896 12.288
4.1.2
Digital audio input format
The TS4657 receives serial digital audio data through a 3-wire interface. SDAT is the serial audio data input. The data is entered MSB first and is a two's complement. The data can be I2S, right or left justified. The data format is chosen with the control pins FORMAT1 and FORMAT2 as detailed in Table 10. Figure 50 on page 20 summarizes the implementation of the audio data format.
Table 10.
FORMAT2
Digital audio data formats supported by the TS4657
BCLK/LRCLK ratio FORMAT1 Data Format Min Max 256 256 256 256 Right-justified, 16-bit data Data valid on rising edge of BCLK Right-justified, 24-bit data Data valid on rising edge of BCLK Left-Justified, 16-bit up to 24-bit data Data valid on rising edge of BCLK IS, 16-bit up to 24-bit data Data valid on rising edge of BCLK
0 0 1 1
0 1 0 1
32 48 2 x number of bits of data 2 x number of bits of data
19/26
Application information Figure 50. Audio interface formats managed by the TS4657
16-bit Right justified data format: pin FORMAT1 = VIL, FORMAT2 = VIL
LRCLK SDAT LEFT
14 15 16-bit word left data LSB
TS4657
RIGHT
0 MSB
1
0 MSB
1 16-bit word right data
14
15 LSB
BCLK
24-bit right-justified data format: pin FORMAT1 = VIH, FORMAT2 = VIL
LRCLK SDAT LEFT
n-2 n-1 n-bit word left data LSB
RIGHT
0 MSB
1
0 MSB
1 n-bit word right data
n-2 n-1 LSB
BCLK
Up to 24-bit left-justified data format: pin FORMAT1 = VIL, FORMAT2 = VIH
LRCLK SDAT LEFT RIGHT
0 MSB
1 n-bit word left data
n-2 n-1 LSB
0 MSB
1 n-bit word right data
n-2 n-1 LSB
BCLK
Up to 24-bit IS data format: pin FORMAT1 = VIH, FORMAT2 = VIH
LRCLK SDAT LEFT RIGHT
0
1 32-bit word left data
n-2 n-1 LSB
0
1 32-bit word right data
n-2 n-1 LSB
MSB
MSB
BCLK
4.2
Power-management unit
The TS4657 utilizes a power-management unit to supply its internal structures. A self-generated negative supply enables the drivers to be powered from positive and negative supplies, therefore increasing the amplitude of the output signal. This internal negative supply switches at a higher frequency than traditional architectures, derived from the master clock MCLK. This structure uses an original design that enables one to suppress the flying or floating capacitors. Therefore, only four small ceramic X5R 10V 1-F decoupling capacitors are necessary for VCCA/VCCD and VREGA/VREGD. Furthermore, the self-generated negative supply allows the amplifier outputs to be centered around zero, thus the bulky output coupling capacitors can be removed.
20/26
TS4657
Application information
4.3
4.3.1
Recommended power-up and power-down sequences
Power-up
It is recommended to power-up the TS4657 prior to applying logical data in order to ensure correct ESD protection biasing. When the STDBY pin is in a low state (VIL,) the circuit is in standby; when the pin is in a high state (VIH), the circuit is enabled. An internal pull-down resistor will force the STDBY pin to ground if no signal is applied to this pin. The standby signal can be delayed from the power-up phase but simultaneous stimuli are possible, as shown in Figure 51. Figure 51. Standby signal delayed from power-up phase
VCCA VCCD
t=0s min STDBY
t=0s min MCLK BCLK LRCLK t=0s min SDAT 80%
VOUTR VOUTL Twu
The wake-up time (Twu) of the TS4657 is defined as the time between the settlement of the digital input signals STDBY, MCLK, BCLK, LRCLK, SDAT and 80% of the VOUTR/VOUTL amplitude. The Twu of the circuit is typically 4.5 ms. If all digital input signals are settled and an ON/OFF sequence is applied quickly on the STDBY pin, the internal capacitors remain charged and the Twu is around 1 ms.
4.3.2
Power-down
As described in Section 4.2, the MCLK is internally used to supply some blocks. It is therefore recommended not to switch off the MCLK during normal operation. To properly power-down the device, MCLK, BCLK and LRCLK should be switched off after the STDBY signal. The power-down time is very short and can be considered as zero.
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Package information
TS4657
5
Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark.
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TS4657
Package information
5.1
QFN20 package information
Figure 52. QFN20 package mechanical drawing
Table 11.
QFN20 package mechanical data
Dimensions
Ref. Min. A A1 A2 A3 b D D2 E E2 e L ddd 0.18 3.85 1.95 3.85 1.95 0.45 0.35 0.80
Millimeters Typ. 0.90 0.02 0.65 0.25 0.23 4.00 2.10 4.00 2.10 0.50 0.55 0.30 4.15 2.25 4.15 2.25 0.55 0.75 0.08 0.007 0.152 0.077 0.152 0.077 0.018 0.014 Max. 1.00 0.05 1.00 Min. 0.031
Inches Typ. 0.035 0.0008 0.026 0.010 0.009 0.157 0.083 0.157 0.083 0.020 0.022 0.012 0.163 0.089 0.163 0.089 0.022 0.030 0.003 Max. 0.040 0.002 0.040
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Ordering information
TS4657
6
Ordering information
Table 12. Order codes
Temperature range -40C, +85C Package QFN20 Packing Tape & reel Marking K657
Order code TS4657IQT
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TS4657
Revision history
7
Revision history
Table 13.
Date 02-Mar-2009
Document revision history
Revision 1 Initial release. Changes
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TS4657
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