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參數(shù)資料
| 型號： | LT1122CM |
| 廠商： | Linear Technology Corporation |
| 英文描述： | CAP 1500UF 250V ELECT THA SERIES |
| 中文描述： | 快速沉降，JFET輸入運算放大器 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 249K |
| 代理商： | LT1122CM |
7
LT1122
U
S
A
O
PPLICATI
IU
U
When the feedback around the op amp is resistive (R
F
), a
pole will be created with R
F,
the source resistance and
capacitance (R
S
, C
S
), and the amplifier input capacitance
(C
IN
≈
4pF). In low closed loop gain configurations and
with R
S
and R
F
in the kilohm range, this pole can create
excess phase shift and even oscillation. A small capacitor
(C
F
) in parallel with R
F
eliminates this problem. With
R
S
(C
S
+ C
IN
) = R
F
C
F
, the effect of the feedback pole is
completely removed.
Settling Time Measurements
Settling time test circuits shown on some competitive
devices’ data sheets require:
1. A “flat top” pulse generator. Unfortunately, flat top
pulse generators are not commercially available.
2. A variable feedback capacitor around the device under
test. This capacitor varies over a four to one range.
Presumably, as each op amp is measured for settling
time, the capacitor is fine tuned to optimize settling
time for that particular device.
3. A small inductor load to optimize settling.
The LT1122’s settling time is 100% tested in the test
circuit shown. No “flat top” pulse generator is required.
The test circuit can be readily constructed, using commer-
cially available ICs. Of course, standard high frequency
board construction techniques should be followed. All
LT1122s are measured with a constant feedback capaci-
tor. No fine tuning is required.
Speed Boost/Overcompensation Terminal
Pin 8 of the LT1122 can be used to change the input stage
operating current of the device. Shorting pin 8 to the
positive supply (Pin 7) increases slew rate and bandwidth
by about 25%, but at the expense of a reduction in phase
margin by approximately 18 degrees. Unity gain capaci-
tive load handling decreases from typically 500pF to
100pF.
Conversely, connecting a 15k resistor from pin 8 to
ground pulls 1mA out of pin 8 (with V
+
= 15V). This
reduces slew rate and bandwidth by 25%. Phase margin
and capacitive load handling improve; the latter typically
increasing to 800pF.
High Speed Operation
As with most high speed amplifiers, care should be taken
with supply decoupling, lead dress and component
placement.
The power supply connections to the LT1122 must main-
tain a low impedance to ground over a bandwidth of
20MHz. This is especially important when driving a signifi-
cant resistive or capacitive load, since all current delivered
to the load comes from the power supplies. Multiple high
quality bypass capacitors are recommended for each
power supply line in any critical application. A 0.1
μ
F
ceramic and a 1
μ
F electrolytic capacitor, as shown, placed
as close as possible to the amplifier (with short lead
lengths to power supply common) will assure adequate
high frequency bypassing, in most applications.
R
S
C
S
C
IN
R
F
C
F
OUTPUT
+
–
LT1122TA04
V+
7
2
6
3
4
1 F
0.1 F
μ
1 F
0.1 F
+
V–
LT1122
LT1122TA03
+
+
–
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
相關PDF資料 |
PDF描述 |
|---|---|
| LT1122CS | Fast Settling, JFET Input Operational Amplifier |
| LT1122DC | Fast Settling, JFET Input Operational Amplifier |
| LT1122DCJ8 | Fast Settling, JFET Input Operational Amplifier |
| LT1122ACN8 | CAP 27000UF 35V ELECT THA SERIES |
| LT1122BC | Fast Settling, JFET Input Operational Amplifier |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1122CMJ8 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Fast Settling, JFET Input Operational Amplifier |
| LT1122CS | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Fast Settling, JFET Input Operational Amplifier |
| LT1122CS8 | 功能描述:IC OP-AMP JFET FASTSETTLNG 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉換速率:350 V/µs 增益帶寬積:180MHz -3db帶寬:320MHz 電流 - 輸入偏壓:12.5µA 電壓 - 輸入偏移:800µV 電流 - 電源:15mA 電流 - 輸出 / 通道:85mA 電壓 - 電源，單路/雙路(±):2.5 V ~ 12.6 V，±1.25 V ~ 6.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) |
| LT1122CS8#PBF | 功能描述:IC OP-AMP JFET FASTSETTLNG 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| LT1122CS8#TR | 功能描述:IC OPAMP JFET FAST-SETTLE 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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