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TS636IDT View Datasheet(PDF) - STMicroelectronics

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TS636IDT Datasheet PDF : 9 Pages
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TS636
DIGITAL INPUTS
Pin
Parameter
Min.
Typ.
Max.
Unit
GC1, GC2, GC3 Low Level
and GC4
High Level
0
0.8
V
2
3.3
Power Down
Thershold Voltage for Power
Down Mode (high level active)
2
0
0.8
3.3
V
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.
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.
Input1
+
_
v
v
v
_
+
Ouput1
+Vcc1
-Vcc
Analog GND
(AGND)
Input2
Power
Down
+
+
_
_
vv
GAIN CONTROL
LOGIC DECODER
POWER DOWN MODE POSITION
Ouput2
+Vcc2
GC1
GC2
GC3
GC4
Digital GND
(DGND)
+Vcc
+Vcc
Power Down
Input
Output
-Vcc
-Vcc
4/9
 

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