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PCM3500E/2K датащи(PDF) 20 Page - Texas Instruments

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номер детали PCM3500E/2K
подробное описание детали  Low Voltage, Low Power, 16-Bit, Mono VOICE/MODEM CODEC
PDF  26 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

PCM3500E/2K датащи(HTML) 20 Page - Texas Instruments

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20
PCM3500
APPLICATIONS INFORMATION
BASIC CIRCUIT CONNECTIONS
The basic connection diagram for the PCM3500 is shown in
Figure 16. Included are the required power supply bypass and
reference decoupling capacitors. The DAC output, VOUT, and
the ADC input, VIN, should be AC-coupled to external cir-
cuitry.
Reference Pin Connections
The VCOM voltage is used internally to bias the input and
output amplifier stages of the PCM3500. It is brought out
FIGURE 16. Basic Connection Diagram.
unbuffered on pin 1 for decoupling. A 1
µF to 10µF alumi-
num electrolytic or tantalum capacitor is recommended for
decoupling purposes. This capacitor should be located as
close as possible to pin 1.
The VCOM voltage is typically equal to VCC/2, and may be
used to bias external input and output circuitry. However,
since the VCOM pin is not a buffered output, it must drive a
high impedance load to avoid excessive loading. Buffering
the VCOM pin with an external op amp configured as a
voltage follower is recommended when driving multiple bias
nodes. Figure 17 shows examples of using VCOM with
external circuitry.
FIGURE 17. Using VCOM to Bias External Circuitry.
V
COM
V
REF1
V
REF2
V
IN
AGND
M/S
TSC
BCK
FS
DIN
DOUT
FSO
V
CC
AGND
V
OUT
AGND
PDWN
LOOP
HPFD
XTI
XTO
SCKIO
DGND
V
DD
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
PCM3500
+
+
+
+
C
3
C
4
C
5
C
6
Serial
Interface
+
+
C
1
+3.3V
External Reset
Power-Down Control
External Clock System
Analog Line Interface Circuit
Telecom Line
+
C
2
C
7
C
1, C2: Power supply bypass capacitors. Parallel combination of a 1µF to 10µF aluminum electrolytic capacitor and 0.1µF ceramic capacitor.
C
3, C4, C5: VREF and VCOM bypass capacitors. Use a 1µF to 10µF aluminum electrolytic capacitor.
C
6, C7: Input/output AC-coupling capacitors. Use a 0.1µF to 10µF aluminum electrolytic capacitor.
+
V
OUT
Non-Polarized
1
µF
PCM3500
4.7
µF
V
COM
V
CC
PCM3500
OPA340
OPA343
+
4.7
µF
Use voltage follower
to buffer V
COM
To Bias
Nodes
V
COM
(a) Biasing an External Active Filter Stage
(b) Using a Buffer to Provide Bias for Multiple or
Low Input Impedance Nodes



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