LT1193 データシートの表示（PDF） - Linear Technology
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LT1193 Datasheet PDF : 12 Pages
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LT1193
APPLICATIO S I FOR ATIO
SHDN
V+
VIN
3+ 5 7
2
1
– LT1193
+/REF
6
VOUT
8 –/FB 4
V–
RFB
SHDN
V+
3+ 5 7
VIN
2
1
– LT1193
+/REF
8 –/FB 4
V–
RFB
6
VOUT
RG
AV
=
+
RFB + RG
RG
RG
AV
=
–
RFB +
RG
RG
VINDIFF
VIN
SHDN
V+
3+ 5 7
2
1
– LT1193
+/REF
8 –/FB 4
SHDN
V+
6
VOUT
VIN
VINDIFF
RG
3+ 5 7
2
1
– LT1193
+/REF
8 –/FB 4
6
VOUT
V–
V–
RFB
RFB
VO
RG
=
(VINDIFF
+
VIN)
RFB +
RG
RG
( ( VO =
RFB + RG
RG
VINDIFF –
RFB
RG
VIN
LT1193 • TA03
No Supply Bypass Capacitors
VOUT
1V/DIV
0V
VOUT
1V/DIV
0V
Settling Time Poor Bypass
0V
VOUT
10mV/DIV
SETTLING TIME TO 10mV, AV = 2
SUPPLY BYPASS CAPACITORS = 0.1µF
LT1192 • TA05
Settling Time Good Bypass
0V VOUT
10mV/DIV
LT1192 • TA06
SETTLING TIME TO 10mV, AV = 2
SUPPLY BYPASS CAPACITORS = 0.1µF + 4.7µF TANTALUM
AV = 10, IN DEMO BOARD, RL = 1k
LT1192 • TA04
In many applications and those requiring good settling
time it is important to use multiple bypass capacitors. A
0.1µF ceramic disc in parallel with a 4.7µF tantalum is
recommended. Two oscilloscope photos with different
bypass conditions are used to illustrate the settling time
characteristics of the amplifier. Note that although the
output waveform looks acceptable at 1V/DIV, when ampli-
fied to 10mV/DIV the settling time to 10mV is 347ns for the
0.1µF bypass; the time drops to 96ns with multiple bypass
capacitors.
8
Operating With Low Closed-Loop Gains
The LT1193 has been optimized for closed-loop gains of
2 or greater; the frequency response illustrates the ob-
tainable closed-loop bandwidths. For a closed-loop gain
of 2 the response peaks about 2dB. Peaking can be
minimized by keeping the feedback elements below 1kΩ,
and can be eliminated by placing a capacitor across the
feedback resistor, (feedback zero). This peaking shows
up as time domain overshoot of about 40%. With the
feedback capacitor it is eliminated.
Cable Terminations
The LT1193 video difference amplifier has been optimized
as a low cost cable driver. The ±50mA guaranteed output
current enables the LT1193 to easily deliver 7.5VP-P into
1193fb
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