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參數(shù)資料
| 型號(hào)： | LT1222C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 500MHz Operational Amplifier |
| 中文描述： | 500MHz的運(yùn)算放大器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 312K |
| 代理商： | LT1222C |
6
LT1222
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
Large Signal, A
V
= 10
Small Signal, A
V
= 10
R
F
= 909
R
G
= 100
LT1222 TPC19
LT1222 TPC20
Large Signal, A
V
= 10,
C
L
= 10,000pF
LT1222 TPC21
Small Signal, A
V
= –10
LT1222 TPC22
LT1222 TPC23
LT1222 TPC24
Large Signal, A
V
= –10
Small Signal, A
V
= –10,
C
L
= 1,000pF
R
F
= 909
R
G
= 100
R
F
= 1k
R
G
= 100
(75)
R
F
= 1k
R
G
= 100
(75)
V
S
=
±
15V
V
IN
= 20mV
f = 5MHz
V
S
=
±
15V
V
IN
= 20mV
f = 5MHz
V
S
=
±
15V
V
IN
= 2V
f = 2MHz
V
S
=
±
15V
V
IN
= 2V
f = 2MHz
APPLICATIO
S I
FOR
ATIO
U
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
W
U
U
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 (0.01
μ
F to 0.1
μ
F).
For high drive current applications use low ESR bypass
capacitors (1
μ
F to 10
μ
F 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.
LT1222 AI01
V
+
V
–
0.1
μ
F
0.1
μ
F
5k
1
3
2
4
7
6
8
LT1222
–
+
R
F
= 909
R
G
= 100
V
S
=
±
15V
V
IN
= 2V
f = 20kHz
R
F
= 1k
R
G
= 100
(75)
V
S
=
±
15V
V
IN
= 15mV
f = 500kHz
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