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| 型號： | LT1167IS8#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PREC INSTRMNT-AMP PROG 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 1.2 V/µs |
| 增益帶寬積： | 1MHz |
| 電流 - 輸入偏壓： | 80pA |
| 電壓 - 輸入偏移： | 20µV |
| 電流 - 電源： | 900µA |
| 電流 - 輸出 / 通道： | 27mA |
| 電壓 - 電源，單路/雙路(±)： | 4.6 V ~ 36 V，±2.3 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(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
LT1167
12
1167fc
BLOCK DIAGRAM
THEORY OF OPERATION
Q1
RG
2
OUTPUT
6
REF
1167 F01
5
7
–
+
A1
–
+
A3
VB
R1
24.7k
R3
400Ω
R4
400Ω
C1
1
RG 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 –
Q2
V –
V +
4
V –
Figure 1. Block Diagram
The LT1167 is a modified version of the three op amp
instrumentation amplifier. Laser trimming and mono-
lithic 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 (0.05% at G = 100) with only
one external resistor RG. The value of RG determines the
transconductance of the preamp stage. As RG is reduced
for larger programmed gains, the transconductance 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
with programmed gain. Therefore, the bandwidth does
not drop proportionally 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 RG. Since
the current that flows through RG also flows through R1
and R2, theratios provide a gained-up differential voltage,
G = (R1 + R2)/RG, to the unity-gain difference amplifier A3.
The common mode voltage is removed by A3, resulting
in a single-ended output voltage referenced to the voltage
on the REF pin. The resulting gain equation is:
VOUT – VREF = G(VIN+ – VIN–)
where:
G = (49.4kΩ / RG) + 1
solving for the gain set resistor gives:
RG = 49.4kΩ /(G – 1)
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| LT1168ACN8 | 功能描述:IC PREC INSTRMNT-AMP PROG 8-DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
| LT1168ACN8#PBF | 功能描述:IC PREC INSTRMNT-AMP PROG 8-DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
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