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TS634 Fiches technique(PDF) 4 Page - STMicroelectronics

No de pièce TS634
Description  DUAL WIDE BAND OPERATIONAL AMPLIFIER FOR ADSL LINE INTERFACE
PDF  9 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS634 Fiches technique(HTML) 4 Page - STMicroelectronics

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TS634
4/9
POWER DOWN MODE
V
CC = ±6Volts, Tamb = 25°C
POWER DOWN EQUIVALENT SCHEMATIC
OUPUT IMPEDANCE IN POWER DOWN MODE
In Power Down Mode the output of the driver is in
"high impedance" state. It is really the case for the
static mode. Regarding the dynamic mode, the im-
pedance decreases due to a capacitive effect of
the collector-substrat and base collector junction.
The impedance behaviour comes capacitive, typi-
cally: 1.4M
Ω // 33pF.
INTERMODULATION DISTORTION
The curves shown below are the measurements
results of a single operator wired as an adder with
a gain of 15dB. The operational amplifier is sup-
plied by a symmetric
±6V and is loaded with 25Ω.
Two synthesizers (Rhode & Schwartz SME) gen-
erate two frequencies (tones) (70 & 80kHz or 180
& 280kHz). An HP3585 spectrum analyzer mea-
sures the spurious level at different frequencies.
The curves are traced for different output levels
(the value in the X axis is the value of each tone).
The output levels of the two tones are the same.
The generators and spectrum analyzer are phase
locked to enhance measurement precision.
3rd ORDER INTERMODULATION
2 tones : 70kHz and 80kHz
2 tones : 180kHz and 280kHz
Symbol
Parameter
Min.
Typ.
Max
Unit
Vpdw
Thershold Voltage for Power Down Mode
V
Low Level
0
0.8
High Level
2
3.3
Iccpdw
Total Power Down Mode Current Consumption
150
µA
Rpdw
Power Down Mode Ouput Impedance
1.4
ΜΩ
Cpdw
Power Down Mode Output Capacitance
33
pF
STANDBY CONTROL
OPERATOR STATUS
operator 1
operator 2
operator 1
operator 2
Vhigh level
Vlow level
Standby
Active
Vhigh level
Vhigh level
Standby
Standby
Vlow level
Vlow level
Active
Active
Vlow level
Vhigh level
Active
Standby
+
_
..
..
Vcc -
Vcc +
POWER
DOWN
Ouput
.
1
1,5
2
2,5
3
3,5
4
4,5
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Vout peak (V)
230kHz
220kHz
90kHz
60kHz
1
1,5
2
2,5
3
3,5
4
4,5
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Vout peak (V)
80kHz
640kHz
380kHz
740kHz



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