RS CS
參數(shù)資料
型號: LT1126CS8
廠商: Linear Technology
文件頁數(shù): 10/12頁
文件大?。?/td> 0K
描述: IC OP-AMP DECOMPENSAT DUAL 8SOIC
標準包裝: 100
放大器類型: 通用
電路數(shù): 2
轉(zhuǎn)換速率: 11 V/µs
增益帶寬積: 65MHz
電流 - 輸入偏壓: 8nA
電壓 - 輸入偏移: 25µV
電流 - 電源: 2.6mA
電壓 - 電源,單路/雙路(±): ±4 V ~ 18 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應商設備封裝: 8-SO
包裝: 管件
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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