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TS636I Datasheet(PDF) 4 Page - STMicroelectronics

Part # TS636I
Description  DIFFERENTIAL VARIABLE GAIN AMPLIFIER FOR ADSL LINE INTERFACE
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS636I Datasheet(HTML) 4 Page - STMicroelectronics

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TS636
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DIGITAL INPUTS
SIMPLIFIED SCHEMATIC
The TS636 consists of two independent channels.
Each channel has two stages. The first is a very low noise digitally controlled variable gain amplifier (range
0 to 18dB).
The TS636 features a high input impedance and a low noise current. To minimize the overall noise figure,
the source impedance must be less than 3k
Ω.
This value gives an equal contribution of voltage and current noises.
The second stage is a gain/attenuation stage (+12dB to -9dB) featuring a low output impedance.
This output stage can drive loads as low as 500
Ω.
POWER DOWN MODE POSITION
Pin
Parameter
Min.
Typ.
Max.
Unit
GC1, GC2, GC3
and GC4
Low Level
0
0.8
V
High Level
2
3.3
Power Down
Thershold Voltage for Power
Down Mode (high level active)
0
0.8
V
23.3
+
_
_
+
+
_
_
+
v
v
GAIN CONTROL
LOGIC DECODER
Input1
+
_
_
+
v
Input2
+Vcc2
Digital GND
(DGND)
Ouput2
Ouput1
+Vcc1
-Vcc
Analog GND
(AGND)
GC2
GC1
GC3
GC4
v
v
v
Power
Down
+Vcc
-Vcc
+Vcc
-Vcc
Power Down
Input
Output


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