LT1222C データシートの表示（PDF） - Linear Technology
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LT1222C Datasheet PDF : 12 Pages
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LT1222
TYPICAL PERFORMANCE CHARACTERISTICS
Small Signal, AV = 10
Large Signal, AV = 10
Large Signal, AV = 10,
CL = 10,000pF
RF = 909Ω VS = ±15V f = 5MHz
RG = 100Ω VIN = 20mV
LT1222 • TPC19
Small Signal, AV = – 10
RF = 909Ω VS = ±15V f = 2MHz
RG = 100Ω VIN = 2V
LT1222 • TPC20
Large Signal, AV = – 10
RF = 909Ω VS = ±15V f = 20kHz
RG = 100Ω VIN = 2V
LT1222 • TPC21
Small Signal, AV = – 10,
CL = 1,000pF
RF = 1k
VS = ±15V f = 5MHz LT1222 • TPC22
RG = 100Ω (75) VIN = 20mV
RF = 1k
VS = ±15V f = 2MHz LT1222 • TPC23
RG = 100Ω (75) VIN = 2V
RF = 1k
VS = ±15V f = 500kHz LT1222 • TPC24
RG = 100Ω (75) VIN = 15mV
APPLICATIONS INFORMATION
The LT1222 is stable in noise gains of 10 or greater and
may be inserted directly into HA2520/2/5, HA2541/2/4,
AD817, AD847, EL2020, EL2044 and LM6361 applica-
tions, provided that the nulling circuitry is removed and
the amplifier configuration has a high enough noise gain.
The suggested nulling circuit for the LT1222 is shown in
the following figure.
Offset Nulling
V+
5k
1
3+ 8
LT1222 7 6
2–
4
0.1μF
0.1μF
V–
LT1222 • AI01
6
Layout and Passive Components
The LT1222 amplifier is easy to apply and tolerant of less
than ideal layouts. For maximum performance (for ex-
ample, fast settling time) use a ground plane, short lead
lengths and RF-quality bypass capacitors (0.01μF to 0.1μF).
For high drive current applications use low ESR bypass
capacitors (1μF to 10μF tantalum). Sockets should be
avoided when maximum frequency performance is re-
quired. For more details see Design Note 50. Feedback
resistors greater than 5k are not recommended because a
pole is formed with the input capacitance which can cause
peaking or oscillations. Stray capacitance on Pin 5 should
be minimized. Bias current cancellation circuitry is em-
ployed on the inputs of the LT1222 so the input bias current
and input offset current have identical specifications. For
this reason, matching the impedance on the inputs to
reduce bias current errors is not necessary.
1222fc
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