参数资料
型号: LT1126CS8#PBF
厂商: Linear Technology
文件页数: 10/12页
文件大小: 0K
描述: IC OP-AMP DECOMPENSAT DUAL 8SOIC
标准包装: 100
放大器类型: 通用
电路数: 2
转换速率: 11 V/µs
增益带宽积: 65MHz
电流 - 输入偏压: 8nA
电压 - 输入偏移: 25µV
电流 - 电源: 2.6mA
电压 - 电源,单路/双路(±): ±4 V ~ 18 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SO
包装: 管件
产品目录页面: 1317 (CN2011-ZH PDF)
LT1126/LT1127
11267fa
7
+
OUTPUT
1126-7 AI01
RS
CS
RF
CF
CIN
FREQUENCY (Hz)
GAIN
ERROR
(%)
0.01
0.1
1.0
0.1
10
100
1126-7 TA03
0.001
1
GAIN ERROR =
CLOSED LOOP GAIN
OPEN LOOP GAIN
TYPICAL
PRECISION
OP AMP
LT1126/LT1127
+
OUTPUT
1126-7 TA02
365
1%
INPUT
15k
5%
340k
1%
20k
TRIM
+15V
–15V
RN60C FILM RESISTORS
THE HIGH GAIN AND WIDE BANDWIDTH OF THE LT1126/LT1127 IS USEFUL IN LOW FREQUENCY HIGH CLOSED
LOOP GAIN AMPLIFIER APPLICATIONS. A TYPICAL PRECISION OP AMP MAY HAVE AN OPEN LOOP GAIN OF ONE
MILLION WITH 500kHz BANDWIDTH. AS THE GAIN ERROR PLOT SHOWS, THIS DEVICE IS CAPABLE OF 0.1%
AMPLIFYING ACCURACY UP TO 0.3Hz ONLY. EVEN INSTRUMENTATION RANGE SIGNALS CAN VARY AT A FASTER
RATE. THE LT1126/LT1127 “GAIN PRECISION — BANDWIDTH PRODUCT” IS 330 TIMES HIGHER, AS SHOWN.
LT1126
High Speed Operation
When the feedback around the op amp is resistive (RF), a
pole will be created with RF, the source resistance and
capacitance (RS, CS), and the amplifier input capacitance
(CIN ≈ 2pF). In low closed loop gain configurations and
Gain Error vs Frequency
Closed Loop Gain = 1000
U
S
A
O
PPLICATI
TYPICAL
Gain 1000 Amplifier with 0.01% Accuracy, DC to 5Hz
with RS and RF in the kilohm range, this pole can create
excess phase shift and even oscillation. A small capacitor
(CF) in parallel with RF eliminates this problem. With
RS (CS + CIN) = RF CF, the effect of the feedback pole is
completely removed.
APPLICATIO S I FOR ATIO
WU
U
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