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PDF ( 数据手册 , 数据表 ) L38812

零件编号 L38812
描述 LINEAR INTEGRATED CIRCUIT
制造商 Unisonic Technologies
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L38812 数据手册, 描述, 功能
UTC L388 12 LINEAR INTEGRATED CIRCUIT
VOICE-SWITCH CIRCUIT FOR
HANDSFREE SPEAKERPHONE
TAM
DESCRIPTION
The UTC L388 12 contains all the necessary circuitry,
amplifiers, detectors, comparators and control functions to
implement a high performance, voice-switched, ”hands-free”
function in an answering machine.
The UTC L 388 12 is designed for answering machines
that are either powered from the telephone line or from a
mains powered dc. supply.
Filtering of both the audio and control signals in both
transmitter and receiver channels possible.
An external loudspeaker amplifier has to be used, normally
the same as used for the answering machine.
FEATURES
*Settable gain dynamics (25 or 50dB)
*Low power consumption, totally 1.0mA at 3.3V typical.
*Background noise compensation in the transmitting channel
*with hold function.
*Excellent noise performance.
*Both channel input amplifiers have balanced inputs.
*Minimum of external components needed for function.
PIN CONFIGURATION
16-pin SO package
CTR 1
-Txin 2
+Txin 3
F2out 4
Txout 5
TxDetin 6
TxDetout 7
NDet 8
16 GND
15 +V
14 -Rxin
13 F5out
12 Rxout
11 RxDetin
10 RxDetout
9 CMP
SOP-16
DIP-18
18-pin DIP package
F2out 1
Txout 2
TxDetin 3
TxDetout 4
N Det 5
CMP 6
RxDetout 7
Rx Detin 8
Rxout 9
18 +Txin
17 -Txin
16 CTR
15 NC
14 GND
13 +V
12 -Rxin
11 +Rxin
10 F5out
UTC
UNISONIC TECHNOLOGIES CO. LTD 1
QW-R108-013,A







L38812 pdf, 数据表
UTC L388 12 LINEAR INTEGRATED CIRCUIT
Mode
25 dB speech
control
50 dB speech
control
DTMFMute
Total mute
Vref
01 2 3
Figure 11. Control modes as function of voltage applied to
gain dynamics control input CTR;ID=1mA
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UTC
UNISONIC TECHNOLOGIES CO. LTD 8
QW-R108-013,A














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