- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375234 > AD620ARZ-REEL (ANALOG DEVICES INC) Low Cost Low Power Instrumentation Amplifier PDF資料下載
參數(shù)資料
| 型號： | AD620ARZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Low Cost Low Power Instrumentation Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 150 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO8 |
| 封裝： | LEAD FREE, MS-021-AA, SOIC-8 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 559K |
| 代理商： | AD620ARZ-REEL |
AD620
THEORY OF OPERATION
Rev. G | Page 13 of 20
V
B
–V
S
A1
A2
A3
C2
R
G
R1
R2
GAIN
SENSE
GAIN
SENSE
R3
400
10k
10k
I2
I1
10k
REF
10k
+IN
– IN
20
μ
A
20
μ
A
R4
400
OUTPUT
C1
Q2
Q1
0
Figure 38. Simplified Schematic of AD620
The AD620 is a monolithic instrumentation amplifier based on
a modification of the classic three op amp approach. Absolute
value trimming allows the user to program gain
accurately
(to 0.15% at G = 100) with only one resistor. Monolithic
construction and laser wafer trimming allow the tight matching
and tracking of circuit components, thus ensuring the high level
of performance inherent in this circuit.
The input transistors Q1 and Q2 provide a single differential-
pair bipolar input for high precision (Figure 38), yet offer 10×
lower input bias current thanks to Supereta processing.
Feedback through the Q1-A1-R1 loop and the Q2-A2-R2 loop
maintains constant collector current of the input devices Q1
and Q2, thereby impressing the input voltage across the external
gain setting resistor
R
G
. This creates a differential gain from the
inputs to the A1/A2 outputs given by
G
= (
R1
+
R2
)/
R
G
+ 1. The
unity-gain subtractor, A3, removes any common-mode signal,
yielding a single-ended output referred to the REF pin potential.
The value of
R
G
also determines the transconductance of the
preamp stage. As
R
G
is reduced for larger gains, the
transconductance increases asymptotically to that of the input
transistors. This has three important advantages: (a) Open-loop
gain is boosted for increasing programmed gain, thus reducing
gain related errors. (b) The gain-bandwidth product
(determined by C1 and C2 and the preamp transconductance)
increases with programmed gain, thus optimizing frequency
response. (c) The input voltage noise is reduced to a value of
9 nV/√Hz, determined mainly by the collector current and base
resistance of the input devices.
The internal gain resistors, R1 and R2, are trimmed to an
absolute value of 24.7 k, allowing the gain to be programmed
accurately with a single external resistor.
The gain equation is then
1
4
R
49
+
=
G
k
G
1
4
G
49
=
k
R
G
Make vs. Buy: a Typical Bridge Application Error Budget
The AD620 offers improved performance over “homebrew”
three op amp IA designs, along with smaller size, fewer
components, and 10× lower supply current. In the typical
application, shown in Figure 39, a gain of 100 is required to
amplify a bridge output of 20 mV full-scale over the industrial
temperature range of 40°C to +85°C. Table 3 shows how to
calculate the effect various error sources have on circuit
accuracy.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD620ARZ-REEL7 | Low Cost Low Power Instrumentation Amplifier |
| AD620BNZ | Low Cost Low Power Instrumentation Amplifier |
| AD620BRZ | Low Cost Low Power Instrumentation Amplifier |
| AD620BRZ-R7 | Low Cost Low Power Instrumentation Amplifier |
| AD620BRZ-RL | Low Cost Low Power Instrumentation Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD620ARZ-REEL7 | 功能描述:IC AMP INST LP LN 18MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產(chǎn)品培訓(xùn)模塊:Differential Circuit Design Techniques for Communication Applications 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:RF/IF 差分 電路數(shù):1 輸出類型:差分 轉(zhuǎn)換速率:9800 V/µs 增益帶寬積:- -3db帶寬:2.9GHz 電流 - 輸入偏壓:3µA 電壓 - 輸入偏移:- 電流 - 電源:40mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):3 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤，CSP 供應(yīng)商設(shè)備封裝:16-LFCSP-VQ 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:551 (CN2011-ZH PDF) 其它名稱:ADL5561ACPZ-R7CT |
| AD620ARZ-REEL7-MOOG | 制造商:Analog Devices 功能描述: |
| AD620B | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, Low Power Instrumentation Amplifier |
| AD620BN | 功能描述:IC AMP INST LP LN 18MA 8DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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-SOIC 包裝:帶卷 (TR) |
| AD620BNZ | 功能描述:IC AMP INST LP LN 18MA 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):4 輸出類型:- 轉(zhuǎn)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(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。