digital audio line driver based on the TS4657
Features
■ Power supply range: 3 V to 5.5 V
■ Audio line output: 2.2 V
range
■ 16 to 24-bit audio data format stereo DAC, 32
to 48 kHz sample rate
2
■ I
S, right or left justified compatible digital
audio interface
■ 95 dB SNR A-weighted at 48 kHz, V
■ 7.4 mA current consumption at V
operation
■ Internal negative power supply to ensure
ground-referenced, cap-less outputs
■ No external capacitor needed for the negative
power supply generation
■ Integrated structure to suppress pop and click
noise
■ Standby mode active low
■ RoHS compliant
Description
for entire VCC
RMS
CC
= 3 V, full
CC
= 5 V
STEVAL-CCA018V1
Single-supply stereo
Data brief
STEVAL-CCA018V1
The digital audio data can be 16 to 24-bits 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, so bulky external output coupling
capacitors are not necessary.
The STEVAL-CCA018V1 demonstration board is
designed provide a platform for evaluating the
performance of the TS4657 stereo digital-to
analog-converter (DAC). The TS4657 integrates a
high-performance audio line driver capable of
generating a 2.2 V
output level from a single
RMS
3.0 to 5.5 V supply.
A single supply is sufficient for the digital and
analog parts of the circuit, eliminating the need for
external regulators.
The TS4657 is a low consumption device, with
only 22 mW of power dissipation at 3.0 V power
supply during full operation.
A 16-bit multi-bit sigma-delta DAC is used,
operating at 256xFs with over sampling digital
interpolation filters.
October 2009 Doc ID 16593 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Schematic diagram STEVAL-CCA018V1
1 Schematic diagram
Figure 1. Circuit schematic
C
CA
V
VCCD
C2
3
C
1
F
1u
uF
C5
C4
1u
1
F
uF
14
18
19
nc20nc
Interface
13
VCCD
VCCA
l
Digi
ta
Digital
ters
Fi
l
Audio
and
DACs
TS4657
VREGD
VREGA
VOUT
VOUTR
IC1
1
2
L
11
C6
2nF2
JP4
nc
R6
820
R5
JP
5
JP7
R7
820
nc
R8
J6
SIP2
OUT L
OUT R
J7
SIL2
JP6
C7
2nF2
2
K
DAT
Control
Interface
DigitalInput
SDAT
MCLK
LRCLK
B
J
5
VCCDVCCA
10uF/6V3
C
1
R1
100KR2100KR3100KR4100K
3
LRCL
4
S
5
BCLK
6
MCLK
3v to 5V5
VCC
N
D
G
J
4
J
3
J2
CLK
J1
VCCD
123
JP1
FORMAT18FORMAT2
7
123
JP2
Format2Format1 /Stdb
UserControl
/STDBY
9
123
JP3
GNDD
GNDA
GNDA15GNDA
GNDD
Epad
1
10
16
17
y
Output Filters
2/4 Doc ID 16593 Rev 1
STEVAL-CCA018V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
29-Oct-2009 1 Initial release.
Doc ID 16593 Rev 1 3/4
STEVAL-CCA018V1
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4/4 Doc ID 16593 Rev 1
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