參數(shù)資料
型號(hào)： 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(yè)數(shù)： 14/23頁(yè)
文件大小： 351K
代理商： TCM37C15AN
TCM37C14A, TCM37C15A
PCMCOMBO WITH PROGRAMMABLE GAIN CONTROL
SLWS018B – JUNE 1996 – REVISED MAY 1998
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
system reliability and design considerations (continued)
device power-up sequence
Latch-up also can occur if a signal source is connected without the device being properly grounded. A signal
applied to one terminal could then find a ground through another signal terminal on the device. To ensure proper
operation of the device and as a safeguard against this sort of latch-up, it is recommended that the following
power-up sequence always be used:
1.
Ensure that no signals are applied to the device before the power-up sequence is complete.
2.
Connect GND.
3.
Apply V
BB
(most negative voltage).
Apply V
CC
(most positive voltage).
Force a power down condition in the device.
4.
5.
6.
Connect the master clock.
7.
Release the power-down condition.
8.
Apply FSX and/or FSR synchronization pulses.
9.
Apply signal inputs.
When powering down the device, this procedure should be followed in the reverse order.
internal sequencing
On the transmit channel, digital outputs PCMOUT and TSX
are held in the high-impedance state for
approximately four frames (500
μ
s) after power up or application of V
BB
or V
CC
. After this delay, PCMOUT and
TSX
are functional and occur in the proper timeslot. The analog circuits on the transmit side require
approximately 60 ms to reach their equilibrium value due to the autozero circuit settling time. Thus, valid digital
information, such as for on/off hook detection, is available almost immediately, while analog information is
available after some delay.
To further enhance system reliability, the PCMOUT and TSX
terminals are placed in a high-impedance state
approximately 20
μ
s after an interruption of MCLK. This interruption could possibly occur with some kind of fault
condition elsewhere in the system.
TCM37C14A only
miscellaneous functions
Miscellaneous functions of the TCM37C14A and TCM37C15A are described in the following paragraphs.
gain/attenuation control
On-chip logic is included on the TCM37C14A and TCM37C15A to control the channel gain or attenuation and
power-down functions with minimum terminal allocation. The operational amplifiers in the receive and transmit
sections can be configured to either attenuate or amplify the signal depending on how external resistors are
connected to the device.
Two control input terminals (GS0 and GS1) select one of three levels of gain or attenuation in the transmit and
receive path as well as power-down. Note that the gain for both the transmit and receive sides are set together
and that the device enters the power-down mode when both GS0 and GS1 are held low.
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