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參數(shù)資料
| 型號： | TCM37C15AN |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | PCM COMBO WITH PROGRAMMABLE GAIN CONTROL |
| 中文描述： | 的PCM組合，具有可編程增益控制 |
| 文件頁數(shù)： | 20/23頁 |
| 文件大小： | 351K |
| 代理商： | TCM37C15AN |
TCM37C14A, TCM37C15A
PCMCOMBO WITH PROGRAMMABLE GAIN CONTROL
SLWS018B – JUNE 1996 – REVISED MAY 1998
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Figure 8 shows a typical application of the TCM37C15A in the attenuation configuration. Resistor values have
been chosen to provide gains of 0 dB, –2.5 dB, and –7 dB in the transmit direction using the formulas in Table 2
(gain is controlled by GS0 and GS1). In the receive direction, gain has been configured for unity at all three
settings of GS0 and GS1.
High-tolerance resistors are recommended for the gain-setting networks to ensure consistant and accurate
gain. Resistor values should be selected such that all equivalent feedback and input resistors values are 10 k
or greater. For example: RSIN || RSA || RTB
≥
10 k
and RTIN || RTA || RTB
≥
10 k
in gain configuration (see
Figure 6 and Table 1), and RSF || RSA || RSB
≥
10 k
and RTF || RTA || RTB
≥
10 k
in attenuation
configuration (see Figure 7 and Table 2).
Connect 0.1
μ
F bypass capacitors across the V
CC
and AGND device terminals and across the V
BB
and AGND
device terminals to reduce noise. For best results, these capacitors should be physically located as close to the
device terminals as possible.
Although the TCM37C14A and TCM37C15A devices are heavily protected against latch-up, 0.4-V Schottky
diodes D1 and D2 should be used for applications in environments that could expose the board to hot-swapping
— a common cause of latch-up (see the latch-up paragraph earlier in this document).
TCM37C15A
PCMIN
FSR
GS1
GS0
FSX
MCLK
PCMOUT
PWRO+
ANLGIN
TS2
TS1
RS2
GSR
12
13
16
17
14
18
9
8
7
10
6
5
2
RIN
3
RS1
4
RSF
13.0 K
RSIN
13.0 K
GSX
19
RTB
10.5 K
RTA
39.2 K
RTF
13.1 K
RTIN
13.1 K
Voice Out
8 kHz Frame Sync
Data In
Gain-Set Inputs
{
Data In
8 kHz Frame Sync
2.048 MHz Master Clock
Voice In
– 5 V
5 V
0.1
μ
F
0.1
μ
F
D2
VBB
AGND
VCC
20
1
DGND
1N5711
1N5711
15
11
D1
Figure 8. Typical TCM37C15A Application
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