TS4657 [STMICROELECTRONICS]
Single supply stereo digital audio line driver with 2.2 Vrms capless outputs; 2.2 Vrms的无电容输出单电源供电的立体声数字音频线路驱动器
| 型号： | TS4657 |
| 厂家： | 
ST |
| 描述： | Single supply stereo digital audio line driver with 2.2 Vrms capless outputs |
| 文件： | 总26页 (文件大小：1414K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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 V range
CC
■ 16- to 24-bit audio data format stereo DAC, 32
Pin connections (top view)
to 48 kHz sample rate
■ I²S, right- or left-justified compatible digital
16
20
audio interface
GNDD
NC
1
15
GNDA
VREGA
VCCA
■ 95 dB SNR A-weighted at 48 kHz, V =5 V
CC
LRCLK
SDAT
BCLK
■ 7.4 mA current consumption at V = 3.0 V,
CC
VOUTL
VOUTR
full operation
5
11
6
10
■ Internal negative power supply to ensure
ground-referenced, capless outputs
■ No external capacitor needed for the negative
power supply generation
Description
■ Integrated structure to suppress pop and click
noise
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.
■ Available in thin QFN20 4 mm x 4 mm package
Applications
One single supply is sufficient for the digital and
analog parts of the circuit, thus eliminating the
need for external regulators.
■ Digital set-top boxes
■ DVD players
■ Digital TVs
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.
■ Notebooks
■ Portable audio equipment
■ Sound cards
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.
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
Power characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Package thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
DAC and output stage performances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3.1
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.4
3.5
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
VREGD
VREGA
VCCA
VCCD
Power
management unit
MCLK
BCLK
VOUTR
VOUTL
DAC
DAC
Digital
Audio
Interface
Digital
filters
LRCLK
SDAT
Control
interface
FORMAT1
FORMAT2 STDBY
GNDD
GNDA
Table 1.
Pin name
Pin description
Pin
I/O
Function
GNDD
NC
1
2
Supply
Digital ground, connected to GND
Non-connected
pin
This pin must remain non-connected.
LRCLK
SDAT
3
4
5
6
7
8
Digital input
Digital input
Digital input
Digital input
Digital input
Digital input
Channel select clock input
Serial audio data input
BCLK
Bit clock input
MCLK
Master clock input
FORMAT2
FORMAT1
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.
STDBY
9
Digital input
Supply
GNDA
VOUTR
VOUTL
VCCA
10
11
12
13
14
15
16
17
18
19
Analog ground, connect to GND.
Analog output Right channel analog output
Analog output Left channel analog output
Supply
Supply
Supply
Supply
Supply
Supply
Supply
Main analog power supply, connected to VCCD
VREGA
GNDA
GNDA
GNDD
VREGD
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
pin
NC
20
This pin must remain non-connected.
3/26
Block diagram and pin description
TS4657
Figure 2.
Typical application schematics
VCCD VCCA
C2
C3
J5
VCCA VCCD
10uF/6V3
1uF
1uF
VCC
3v to 5V5
1
1
C1
C4
C5
J6
GND
1uF
1uF
IC1
C6
3
4
5
6
820
R5
2nF2
LRCLK
SDAT
BCLK
MCLK
J4
J2
LRCLK
SDAT J3
BCLK
Digital
Filters
and
12
11
SMB OUT L
VOUTL
VOUTR
Digital
Audio
J7
Digital Input
J8
DACs
R7
820
Interface
SMB OUT R
C7
MCLK J1
2nF2
Control
Interface
TS4657
Optional
Epad
VCCD
JP1
JP2
JP3
/Stdby
Format1 Format2
User Control
Figure 3.
Typical test schematics
VCCD VCCA
C2
C3
J5
J6
VCCA VCCD
10uF/6V3
1uF
1uF
VCC
GND
1
1
C1
C4
C5
1uF
1uF
IC1
J4
LRCLK
3
4
5
6
LRCLK
SDAT
BCLK
MCLK
Digital
Filters
and
12
11
SMB
J7
OUT L
VOUTL
VOUTR
Digital
Audio
SDAT J3
BCLK J2
MCLK J1
J8
DACs
Interface
SMB OUT R
Control
Interface
TS4657
Epad
VCCD
JP1
JP2
JP3
/Stdby
Format1 Format2
4/26
TS4657
Absolute maximum ratings
2
Absolute maximum ratings
Table 2.
Symbol
Key parameters and their absolute maximum ratings
Parameter
Value
Unit
VCC
Vi
Supply voltage (1)
5.5
V
Digital input voltage
GND to VCC
V
MCLK, BCLK, LRCLK, SDAT, FORMAT1, FORMAT2, STDBY
Toper
Tstg
Tj
Operating free air temperature range
Storage temperature
-40 to + 85
-65 to +150
150
°C
°C
Maximum junction temperature
Thermal resistance junction to ambient
Human body model
°C
Rthja
ESD
ESD
100
°C/W
kV
2
Machine model
200
V
Latch-up immunity
Class A
260
Lead temperature (soldering, 10 secs)
°C
1. All voltage values are measured with respect to ground.
5/26
Electrical characteristics
TS4657
3
Electrical characteristics
3.1
Power characteristics
Table 3.
Symbol
VCC = 3.3 V T = 25° C (unless otherwise specified)
Parameter
Min. Typ. Max. Unit
VCC
Power supply
3.0
5.5
V
Total supply current.
Full operation, RL = 10 KΩ, vstdby ≥ 2.0 V
ICC
mA
7.4
8
9.5
9.8
VCC = 3.0 V
VCC = 5.0 V
Standby current consumption. VCC = 3 V to VCC = 5.5 V
ICCstby
25
50
1000
2000
nA
Vstdby = 0 V
Vstdby = 0.8 V
3.2
Package thermal characteristics
Table 4.
Symbol
Operating conditions
Parameter
Thermal resistance junction to ambient for QFN20(1)
Min. Typ. Max. Unit
40 °C/W
Rthja
1. With heat sink surface = 125 mm2.
6/26
TS4657
Electrical characteristics
3.3
DAC and output stage performances
Table 5.
V
= 3.0 V to Vcc = 5.5 V, Rload = 10 kΩ Cload = 100 pF, T = 25° C
CC
(unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
Operating conditions
Audio data input format
16
32
5
24
48
bits
kHz
kΩ
-
Fs
Sampling frequency
Load resistor
RL
CL
10
Load capacitance
100
150
0.8
pF
Digital input characteristics
VIL
Low-level input voltage
High-level input voltage
V
V
VIH
2
Dynamic parameters
Full-scale output voltage swing
in at 0 dBFS; RL ≥ RLmin; CL=100 pF
VoutRMS
Vrms
V
2.1
2.2
Table 6.
Symbol
V
= 3.3 V, Rload = 10 kΩ Cload = 100 pF, T = 25° C (unless otherwise specified)
CC
Parameter
Min.
Typ.
Max.
Unit
Dynamic parameters
Dynamic range. A-weighted
DR
dB
dB
16-bit data; Vin at -60 dBFS, FS = 48 kHz, Fin = 1 kHz
88
93
Signal-to-noise ratio, FS = 48 kHz, Fin = 1 kHz, referred to
output
SNR
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
89
87
87
94.5
92.5
93
Total harmonic distortion and noise. Fin = 1 kHz
V
V
in at -20 dBFS, 18-bit data input
in at -6 dBFS, 18-bit data input
72
82
81
THD+N
PSRR
dB
dB
74
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
80
71
46
LRiso
Voo
Channel separation. 1 kHz, Vin at 0 dBFS
Output offset voltage
100
dB
mV
dB
-20
20
Gain channel balance
-0.2
0.01
4.5
0.2
twu
Wake-up time
ms
7/26
Electrical characteristics
TS4657
Table 7.
Symbol
V
= 5 V, Rload = 10 kΩ, Cload = 100 pF, T = 25° C (unless otherwise specified)
CC
Parameter
Min.
Typ.
Max.
Unit
Dynamic range; A-weighted
DR
dB
16-bit data; measured at -60 dBFS, FS = 48 kHz, Fin = 1 kHz
88
93
Signal-to-noise ratio, FS = 48 kHz, Fin = 1 kHz, referred to
output
SNR
dB
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
89
74
95
93
93
Total harmonic distortion and noise. Fin = 1 kHz
Vin at -20 dBFS
Vin at -6 dBFS
Vin at 0 dBFS
72
82.5
81.5
THD+N
PSRR
dB
dB
Power supply rejection ratio, Vripple = 200 mVpp
F= 217 Hz
F= 1 kHz
20 Hz < F < 20 kHz
80
73
48
LRiso
Voo
Channel separation. 1 kHz, Vin at 0 dBFS
Output offset voltage
100
dB
mV
dB
-20
-0.2
3
20
0.2
6
Gain channel balance
0.01
4.5
twu
Wake-up time(1)
ms
1. See timing diagram in application information.
3.3.1
Terminology
SNR: signal-to-noise ratio is expressed in dB. The theoretical formula is:
2
VH1
⎛
⎜
⎝
⎞
⎟
⎠
-------------------
2
SNRdB = 10log
Vnoise
where V
signal.
is the integrated noise from 20 Hz to 20 kHz and VH is the fundamental of the
1
noise
For unweighted measurements, the SNR is given by:
2
VH1
----------------------------------------------------------------------
SNRdB = 10log
20kHz
u(f)(vnoise(f)) 2df
∫
20Hz
where v
is the noise spectral density and u(f) is the unweighted filter transfer function
noise
(20 Hz, 20 kHz).
For A-weighted measurements:
2
VH1
----------------------------------------------------------------------
SNRdB = 10log
20kHz
A
A(f)(vnoise(f)) 2df
∫
20Hz
where v
is the noise spectral density and A(f) is the A-weighted filter transfer function.
noise
8/26
TS4657
Electrical characteristics
THD+N: total harmonic distortion and noise-to signal-ratio is expressed in dB. It is given by:
k
2
VHi2 + Vnoise
∑
i = 2
------------------------------------------------
THD + NdB = 10log
2
Voutrms
where VH is the rms value of the harmonic components.
i
SINAD: signal and noise distortion is expressed in dB. The equation is given by:
2
Voutrms
------------------------------------------------
SINADdB = 10log
k
2
VHi2 + Vnoise
∑
i = 2
DR: dynamic range is expressed in dB, with the following equation:
k
VHi2
∑
i = 1
----------------------
2
DRdB = 10log
Vnoise
3.4
Digital filter characteristics
Table 8.
Symbol
V
= 3.3 V T= 25° C (unless otherwise specified)
CC
Parameter
Min.
Typ.
Max.
Unit
-
-
-
Passband edge (-3 dB)
0.48Fs
Passband ripple f < 0.45 Fs
Stopband attenuation f > 0.55 Fs
+/- 0.1
dB
dB
-50
9/26
Electrical characteristics
TS4657
3.4.1
DAC digital filter response
Figure 4.
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
Electrical measurement curves
Figure 7.
Crosstalk vs. frequency
Figure 8.
Crosstalk vs. frequency
FS=48kHz
FS=48kHz
FS=44.1kHz
FS=32kHz
FS=44.1kHz
FS=32kHz
FS=44.1kHz
FS=32kHz
FS=32kHz
FS=48kHz
FS=48kHz
R
L = 10kΩ
RL = 10k
VCC = 5V
VIN = 0dBFS
TAMB = 25°C
Ω
VCC = 3V
VIN = 0dBFS
TAMB = 25°C
FS=44.1kHz
Figure 9.
Frequency response
Figure 10. Frequency response
FS=48kHz
FS=48kHz
FS=44.1kHz
FS=44.1kHz
RL = 10k
Ω
VCC = 3V
VIN = 0dBFS
TAMB = 25°C
RL = 10k
VCC = 5V
VIN = 0dBFS
Ω
FS=32kHz
FS=32kHz
TAMB = 25°C
Figure 11. Current consumption vs. power
supply voltage
Figure 12. Current consumption vs. standby
voltage
FS=48kHz
FS = 48kHz
FIN = 1kHz
FS=32kHz
VIN = 0dBFS
RL = 100k
TAMB = 25
Ω
FS = 32kHz
FIN = 1kHz
VIN = 0dBFS
°C
Serial Bus = ON (I2S)
RL = 100k
Ω
FIN = 1kHz
Serial Bus = OFF
VIN = 0dBFS
TAMB = 25°C
11/26
Electrical characteristics
TS4657
Figure 13. Output swing vs. power supply
voltage
Figure 14. Power dissipation vs. frequency
VCC = 5V
VCC = 3V3
VCC = 3V
RL = 5kΩ, 10kΩ or 100kΩ
RL = 10k
FIN = 1kHz
Ω
FS = 32kHz, 44.1kHz or 48kHz
FIN = 1kHz
VIN = 0dBFS
VIN = 0dBFS
TAMB = 25°C
TAMB = 25°C
Figure 15. Power supply rejection ratio vs.
frequency
Figure 16. Power supply rejection ratio vs.
frequency
0
-10
-20
-30
0
-10
-20
-30
-40
-40
-50
-60
-70
-80
-90
Ω
Ω
Ω
Ω
Ω
Ω
°
°
-50
-60
-70
-80
-90
20
20
100
1000
10000 20k
100
1000
10000 20k
Figure 17. Power supply rejection ratio vs.
frequency
Figure 18. Signal to noise ratio vs. input level
0
-10
-20
-30
-40
VCC = 3V
A-Weighted
RL = 5k
Ω
FS = 32kHz
Input Data = 16bits
FIN = 1kHz
LPF = 20kHz
TAMB = 25°C
Ω
Ω
Ω
Unweighted
-50
-60
°
-70
-80
-90
-100
20
100
1000
10000 20k
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
VCC = 3V
RL = 5k
A-Weighted
A-Weighted
Ω
Ω
FS = 32kHz
FS = 48kHz
Input Data = 18bits
FIN = 1kHz
Input Data = 16bits
FIN = 1kHz
LPF = 20kHz
LPF = 20kHz
TAMB = 25
°
C
TAMB = 25°C
Unweighted
Unweighted
Figure 21. Signal to noise ratio vs. input level Figure 22. Signal to noise ratio vs. input level
VCC = 3V
RL = 5k
VCC = 5V
RL = 5k
A-Weighted
A-Weighted
Ω
Ω
FS = 48kHz
FS = 32kHz
Input Data = 18bits
FIN = 1kHz
Input Data = 16bits
FIN = 1kHz
LPF = 20kHz
LPF = 20kHz
TAMB = 25
°
C
TAMB = 25°C
Unweighted
Unweighted
Figure 23. Signal to noise ratio vs. input level Figure 24. Signal to noise ratio vs. input level
VCC = 5V
RL = 5k
VCC = 5V
RL = 5k
A-Weighted
A-Weighted
Ω
Ω
FS = 32kHz
FS = 48kHz
Input Data = 18bits
FIN = 1kHz
Input Data = 16bits
FIN = 1kHz
LPF = 20kHz
LPF = 20kHz
TAMB = 25
°
C
TAMB = 25°C
Unweighted
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 = 3V
VCC = 5V
RL = 5k
RL = 10k
Ω
A-Weighted
A-Weighted
Ω
FS = 32kHz
Input Data = 16bits
FIN = 1kHz
FS = 48kHz
Input Data = 18bits
FIN = 1kHz
LPF = 20kHz
LPF = 20kHz
TAMB = 25°C
TAMB = 25°C
Unweighted
Unweighted
Figure 27. Signal to noise ratio vs. input level Figure 28. Signal to noise ratio vs. input level
VCC = 3V
VCC = 3V
RL = 10k
Ω
RL = 10kΩ
A-Weighted
A-Weighted
FS = 32kHz
Input Data = 18bits
FIN = 1kHz
FS = 48kHz
Input Data = 16bits
FIN = 1kHz
LPF = 20kHz
LPF = 20kHz
TAMB = 25°C
TAMB = 25°C
Unweighted
Unweighted
Figure 29. Signal to noise ratio vs. input level Figure 30. Signal to noise ratio vs. input level
VCC = 3V
VCC = 5V
RL = 10k
Ω
RL = 10kΩ
A-Weighted
A-Weighted
FS = 48kHz
Input Data = 18bits
FIN = 1kHz
FS = 32kHz
Input Data = 16bits
FIN = 1kHz
LPF = 20kHz
LPF = 20kHz
TAMB = 25°C
TAMB = 25°C
Unweighted
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
VCC = 5V
RL = 10k
Ω
RL = 10kΩ
A-Weighted
A-Weighted
FS = 32kHz
Input Data = 18bits
FIN = 1kHz
FS = 48kHz
Input Data = 16bits
FIN = 1kHz
LPF = 20kHz
LPF = 20kHz
TAMB = 25
°
C
TAMB = 25°C
Unweighted
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
VCC = 3V
RL = 10k
FS = 32kHz
Input Data = 16bits
VIN = -6dBFS
Unweighted
Ω
A-Weighted
Ω
TAMB = 25°C
Unweighted
LPF = 20kHz
TAMB = 25°C
20
20k
Figure 35. Total harmonic distortion and noise Figure 36. Total harmonic distortion and noise
vs. frequency vs. frequency
VCC = 3V
RL = 10k
VCC = 3V
RL = 10k
Ω
Ω
FS = 48kHz
FS = 32kHz
Input Data = 16bits
VIN = -6dBFS
Unweighted
Input Data = 18bits
VIN = -6dBFS
Unweighted
LPF = 20kHz
LPF = 20kHz
TAMB = 25°C
TAMB = 25°C
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
Ω
FS = 32kHz
Input Data = 16bits
VIN = -6dBFS
Unweighted
LPF = 20kHz
TAMB = 25°C
20
20k
Figure 39. Total harmonic distortion and noise Figure 40. Total harmonic distortion and noise
vs. frequency vs. frequency
VCC = 5V
RL = 10k
VCC = 5V
RL = 10k
Ω
Ω
FS = 48kHz
FS = 32kHz
Input Data = 16bits
VIN = -6dBFS
Unweighted
Input Data = 18bits
VIN = -6dBFS
Unweighted
LPF = 20kHz
LPF = 20kHz
TAMB = 25°C
TAMB = 25°C
20
20k
20
20k
Figure 41. Total harmonic distortion and noise Figure 42. Total harmonic distortion and noise
vs. frequency vs. input level
VCC = 3V
VCC = 5V
RL = 10k
FS = 48kHz
Input Data = 18bits
VIN = -6dBFS
Unweighted
RL = 10k
Ω
Ω
FS = 32kHz
Input Data = 16bits
FIN = 1kHz
Unweighted
LPF = 20kHz
TAMB = 25°C
LPF = 20kHz
TAMB = 25°C
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
VCC = 3V
RL = 10k
Ω
RL = 10k
Ω
FS = 32kHz
Input Data = 18bits
FIN = 1kHz
FS = 48kHz
Input Data = 16bits
FIN = 1kHz
Unweighted
LPF = 20kHz
Unweighted
LPF = 20kHz
TAMB = 25°C
TAMB = 25°C
Figure 45. Total harmonic distortion and noise Figure 46. Total harmonic distortion and noise
vs. input level vs. input level
VCC = 3V
VCC = 5V
RL = 10k
Ω
RL = 10kΩ
FS = 48kHz
Input Data = 18bits
FIN = 1kHz
FS = 32kHz
Input Data = 16bits
FIN = 1kHz
Unweighted
LPF = 20kHz
Unweighted
LPF = 20kHz
TAMB = 25°C
TAMB = 25°C
Figure 47. Total harmonic distortion and noise Figure 48. Total harmonic distortion and noise
vs. input level vs. input level
VCC = 5V
VCC = 5V
RL = 10k
Ω
RL = 10k
Ω
FS = 32kHz
Input Data = 18bits
FIN = 1kHz
FS = 48kHz
Input Data = 16bits
FIN = 1kHz
Unweighted
LPF = 20kHz
Unweighted
LPF = 20kHz
TAMB = 25°C
TAMB = 25°C
17/26
Electrical characteristics
TS4657
Figure 49. Total harmonic distortion and noise
vs. input level
VCC = 5V
RL = 10k
Ω
FS = 48kHz
Input Data = 18bits
FIN = 1kHz
Unweighted
LPF = 20kHz
TAMB = 25°C
18/26
TS4657
Application information
4
Application information
4.1
Serial audio interface
4.1.1
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
LRCLK (kHz)
MCLK (MHz)
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
2
I S, 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. Digital audio data formats supported by the TS4657
BCLK/LRCLK ratio
Min
FORMAT2
FORMAT1
Data Format
Max
Right-justified, 16-bit data
Data valid on rising edge of BCLK
0
0
1
1
0
1
0
1
32
48
256
Right-justified, 24-bit data
Data valid on rising edge of BCLK
256
256
256
Left-Justified, 16-bit up to 24-bit data
Data valid on rising edge of BCLK
2 x number of bits of data
2 x number of bits of data
I²S, 16-bit up to 24-bit data
Data valid on rising edge of BCLK
19/26
Application information
Figure 50. Audio interface formats managed by the TS4657
16-bit Right justified data format: pin FORMAT1 = VIL, FORMAT2 = VIL
TS4657
RIGHT
LRCLK
SDAT
LEFT
15
0
1
0
1
14 15
LSB
14
MSB
16-bit word right data
MSB
16-bit word left data
LSB
BCLK
24-bit right-justified data format: pin FORMAT1 = VIH, FORMAT2 = VIL
RIGHT
LRCLK
SDAT
LEFT
n-1
0
1
0
1
n-2 n-1
LSB
n-2
MSB
n-bit word left data
LSB
MSB
n-bit word right data
BCLK
Up to 24-bit left-justified data format: pin FORMAT1 = VIL, FORMAT2 = VIH
RIGHT
LRCLK
SDAT
LEFT
0
1
n-1
0
1
n-2 n-1
LSB
n-2
MSB
n-bit word left data
LSB
MSB
n-bit word right data
BCLK
Up to 24-bit I²S data format: pin FORMAT1 = VIH, FORMAT2 = VIH
RIGHT
LRCLK
SDAT
LEFT
0
1
0
1
n-1
n-2 n-1
LSB
n-2
MSB
MSB
32-bit word left data
LSB
32-bit word right data
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-µF
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
Recommended power-up and power-down sequences
4.3.1
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=0µs min
STDBY
t=0µs min
MCLK BCLK
LRCLK
t=0µs 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.
21/26
Package information
TS4657
5
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
®
®
ECOPACK packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
®
ECOPACK is an ST trademark.
22/26
TS4657
Package information
5.1
QFN20 package information
Figure 52. QFN20 package mechanical drawing
Table 11. QFN20 package mechanical data
Dimensions
Ref.
Millimeters
Typ.
Inches
Min.
Max.
Min.
Typ.
Max.
A
A1
A2
A3
b
0.80
0.90
0.02
0.65
0.25
0.23
4.00
2.10
4.00
2.10
0.50
0.55
1.00
0.05
1.00
0.031
0.035
0.0008
0.026
0.010
0.009
0.157
0.083
0.157
0.083
0.020
0.022
0.040
0.002
0.040
0.18
3.85
1.95
3.85
1.95
0.45
0.35
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
0.012
0.163
0.089
0.163
0.089
0.022
0.030
0.003
D
D2
E
E2
e
L
ddd
23/26
Ordering information
TS4657
6
Ordering information
Table 12. Order codes
Order code
Temperature range
-40°C, +85°C
Package
Packing
Marking
K657
TS4657IQT
QFN20
Tape & reel
24/26
TS4657
Revision history
7
Revision history
Table 13. Document revision history
Date
Revision
Changes
02-Mar-2009
1
Initial release.
25/26
TS4657
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26/26
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