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參數(shù)資料
| 型號： | LT1920CN8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Precision Instrumentation Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 185 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 329K |
| 代理商： | LT1920CN8 |
8
LT1920
with programmed gain. Therefore, the bandwidth does not
drop proportional to gain.
The input transistors Q1 and Q2 offer excellent matching,
which is inherent in NPN bipolar transistors, as well as
picoampere input bias current due to superbeta process-
ing. The collector currents in Q1 and Q2 are held constant
due to the feedback through the Q1-A1-R1 loop and
Q2-A2-R2 loop which in turn impresses the differential
input voltage across the external gain set resistor R
G
.
Since the current that flows through R
G
also flows through
R
1 and R2, the ratios provide a gained-up differential volt-
age, G = (R1 + R2)/R
G
, to the unity-gain difference
amplifier
A3. The common mode voltage is removed by A3, result-
ing in a single-ended output voltage referenced to the
voltage on the REF pin. The resulting gain equation is:
V
OUT
– V
REF
= G(V
IN+
– V
IN–
)
where:
G = (49.4k
/R
G
) + 1
solving for the gain set resistor gives:
R
G
= 49.4k
/(G – 1)
THEORY OF OPERATIOU
The LT1920 is a modified version of the three op amp
instrumentation amplifier. Laser trimming and monolithic
construction allow tight matching and tracking of circuit
parameters over the specified temperature range. Refer to
the block diagram (Figure 1) to understand the following
circuit description. The collector currents in Q1 and Q2 are
trimmed to minimize offset voltage drift, thus assuring a
high level of performance. R1 and R2 are trimmed to an
absolute value of 24.7k to assure that the gain can be set
accurately (0.3% at G = 100) with only one external
resistor R
G
. The value of R
G
in parallel with R1 (R2)
determines the transconductance of the preamp stage. As
R
G
is reduced for larger programmed gains, the transcon-
ductance of the input preamp stage increases to that of the
input transistors Q1 and Q2. This increases the open-loop
gain when the programmed gain is increased, reducing
the input referred gain related errors and noise. The input
voltage noise at gains greater than 50 is determined only
by Q1 and Q2. At lower gains the noise of the difference
amplifier and preamp gain setting resistors increase the
noise. The gain bandwidth product is determined by C1,
C2 and the preamp transconductance which increases
BLOCK DIAGRA
M
W
Q1
R
G
2
OUTPUT
6
REF
1920 F01
5
7
–
+
A1
–
+
A3
VB
R1
24.7k
R3
400
R4
400
C1
1
R
G
8
R7
10k
R8
10k
R5
10k
R6
10k
DIFFERENCE AMPLIFIER STAGE
PREAMP STAGE
+IN
–IN
3
–
+
A2
VB
R2
24.7k
C2
V
+
V
–
V
–
V
+
V
–
Q2
V
–
V
+
4
V
–
Figure 1. Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1920C | Precision Instrumentation Amplifier |
| LT1920I | Precision Instrumentation Amplifier |
| LT1920 | Low Power, Precision Instrumentation Amplifier(低功耗,精密儀用放大器) |
| LT1930ES5 | 1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters |
| LT1930 | Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1920CN8#PBF | 功能描述:IC PREC INSTRUMENTATION AMP 8DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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(zhuǎn)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(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) |
| LT1920CS8 | 功能描述:IC PREC INSTRUMNTATION AMP 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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(zhuǎn)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(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) |
| LT1920CS8#PBF | 功能描述:IC PREC INSTRUMNTATION AMP 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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(zhuǎn)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(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) |
| LT1920CS8#PBF | 制造商:Linear Technology 功能描述:Instrumentation Amplifier IC |
| LT1920CS8#TR | 功能描述:IC AMP INSTRUMENT PREC LP 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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(zhuǎn)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(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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