參數(shù)資料
型號(hào)： TPS9104Y
廠商： Texas Instruments, Inc.
英文描述： CELLULAR SUBSCRIBER TERMINAL POWER SUPPLY/AUDIO SYSTEM
中文描述： 移動(dòng)用戶終端電源/音頻系統(tǒng)
文件頁(yè)數(shù)： 6/33頁(yè)
文件大?。?/td> 557K
代理商： TPS9104Y
TPS9104
CELLULAR SUBSCRIBER TERMINAL
POWER SUPPLY/AUDIO SYSTEM
SLVS133A – AUGUST 1996 – REVISED APRIL 1998
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
The ON_REM signal can be used in the same manner as ON in enabling or disabling the TPS9104. The signal
is provided as a system interface to increase the flexibility of the system. EN can also be used as an input
wired-OR open collector/drain to enable the TPS9104; however, it does not produce a logic signal ON and
therefore cannot be used in the disable sequence described above. It is not recommended that EN be used as
the primary enable signal for the TPS9104.
Enable Sequence
Disable Sequence
ON Must Be Held Low Until
System Responds With A High
Signal At OFF.
ON Is Pressed To Turn Off
The System (Phone).
Once EN Goes Low, The Status Of The
UVLO And The OTP Are Checked.
If The UVLO And OTP Are Valid, VL
And Other Functions Are Enabled.
250 ms
250 ms After VL Rises Above The Reset
Threshold Voltage, RESET Goes High.
The System Can Now
Respond With A High Signal
At OFF.
Once OFF And RESET Are High,
The Enable Input Is Latched On.
System Detects The High
Signal At ON And
Responds With a Low
Signal At OFF.
ON
ON
EN
VL
RESET
OFF
VA
VB
EN_A And EN_B Are both Active And
Low.
Figure 1. Recommended Enable and Disable Sequence
speaker/ringer power amplifiers
The TPS9104 includes two differential-output power amplifiers capable of driving dynamic or piezoelectric
speakers. Both amplifiers have enable inputs to reduce supply current to leakage levels when the amplifiers
are not in use. Depopping circuitry prevents objectionable noise when the enable inputs are cycled on or off.
Each amplifier requires only two gain-setting resistors and a capacitor for dc blocking (see Figure 46).
RNGR_EN and SPKR_EN inputs are disabled when RESET is asserted. Both the SPKR_EN and the
RNGR_EN have internal 10-
μ
A pullups.
microphone amplifier
This is a high-gain amplifier capable of driving a 10-k
load at 3 V peak-to-peak output. MIC_EN input is
disabled when RESET is asserted. The microphone amplifier has an enable input that reduces supply current
to leakage levels when disabled. Added depopping circuitry prevents objectionable noise when the enable input
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