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| 型號： | AD621AN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Drift, Low Power Instrumentation Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 185 uV OFFSET-MAX, 0.2 MHz BAND WIDTH, PDIP8 |
| 封裝： | MINI, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 663K |
| 代理商： | AD621AN |
AD621
REV. A
–14–
Gain Selection
The AD621 has accurate, low temperature coefficient (TC),
gains of 10 and 100 available. The gain of the AD621 is nomi-
nally set at 10; this is easily changed to a gain of 100 by simply
connecting a jumper between Pins 1 and 8.
6
5
3
2
AD621
...
R
EXT
555.5
5,555.5
...
Figure 37. Programming the AD621 for Gains Between
10 and 100
As shown in Figure 37, the device can be programmed for any
gain between 10 and 100 by connecting a single external resistor
between Pins 1 and 8. Note that adding the external resistor will
degrade both the gain accuracy and gain TC. Since the gain
equation of the AD621 yields:
G
=
1
+
9(
R
X
+
6,111.111)
(
R
X
+
555.555)
This can be solved for the nominal value of external resistor for
gains between 10 and 100:
R
X
=
(
G
–1)555.555– 55,000
(10 –
G
)
Table III gives practical 1% resistor values for several common
gains.
Table III. Practical 1% External Resistor
Values for Gains Between 10 and 100
Desired Recommended
Gain
1% Resistor Value
Gain Error Temperature
Coefficient (TC)
10
20
∞
(Pins 1 and 8 Open)
4.42 k
*
≈±
10%
*5 ppm/
°
C max
≈
0.4 (50 ppm/
°
C
+ Resistor TC)
≈
0.4 (50 ppm/
°
C
+ Resistor TC)
*5 ppm/
°
C max
50
698
≈±
10%
100
0 (Pins 1 and 8 Shorted)*
A High Performance Programmable Gain Amplifier
The excellent performance of the AD621 at a gain of 10 make it
a good choice to team up with the AD526 programmable gain
amplifier (PGA) to yield a differential input PGA with gains of
10, 20, 40, 80, 160. As shown in Figure 38, the low offset of the
AD621 allows total circuit offset to be trimmed using the offset
null of the AD526, with only a negligible increase in total drift
error. The total gain TC will be 9 ppm/
°
C max, with 2
μ
V/
°
C
typical input offset drift. Bandwidth is 600 kHz to gains of 10 to
80, and 350 kHz at G = 160. Settling time is 13
μ
s to 0.01%
for a 10 V output step for all gains.
7
4
6
5
3
2
AD621
+V
S
–V
S
INPUTS
+
–
10
7
9
4
3
AD526
+V
S
–V
S
0.1
μ
F
0.1
μ
F
G = 10
8
5
6
0.1
μ
F
OUTPUT
2
20k
OFFSET
NULL
(OPTIONAL)
0.1
μ
F
Figure 38. A High Performance Programmable Gain
Amplifier
COMMON-MODE REJECTION
Instrumentation amplifiers like the AD621 offer high CMR
which is a measure of the change in output voltage when both
inputs arc changed by equal amounts. These specifications are
usually given for a full-range input voltage change and a speci-
fied source imbalance.
For optimal CMR the reference terminal should be tied to a low
impedance point, and differences in capacitance and resistance
should be kept to a minimum between the two inputs. In many
applications shielded cables are used to minimize noise, and for
best CMR over frequency the shield should he properly driven.
Figures 39 and 40 show active data guards which are configured
to improve ac common-mode rejections by “bootstrapping” the
capacitances of input cable shields, thus minimizing the capaci-
tance mismatch between the inputs.
REFERENCE
V
OUT
AD621
100
100
– INPUT
+ INPUT
AD648
1
2
3
7
8
5
6
4
+V
S
–V
S
100k
100k
–V
S
Figure 39. Differential Shield Driver, G = 10
AD548
100
– INPUT
+ INPUT
REFERENCE
V
OUT
AD621
4
–V
S
+V
S
8
3
1
2
7
5
6
Figure 40. Common-Mode Shield Driver, G = 100
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PDF描述 |
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| AD621AR | Low Drift, Low Power Instrumentation Amplifier |
| AD621B | RE Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 3.3V; Output Voltage (Vdc): 3.3V; Power: 1W; Industry Standard Pinout; 1kVDC & 2kVDC Isolation; UL94V-0 Package Material; Optional Continuous Short Circuit Protected; Fully Encapsulated; Custom Solutions Available; Efficiency to 85% |
| AD621BN | Low Drift, Low Power Instrumentation Amplifier |
| AD621BR | Low Drift, Low Power Instrumentation Amplifier |
| AD621S | Low Drift, Low Power Instrumentation Amplifier |
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| AD621ANZ | 功能描述:IC AMP INST LDRIFT LP 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 |
| AD621AR | 功能描述:IC AMP INST LDRIFT LP 18MA 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: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) |
| AD621AR-REEL | 制造商:Analog Devices 功能描述:SP Amp INSTR Amp Single 制造商:Rochester Electronics LLC 功能描述:LOW DRIFT LOW POWER INAMP - Tape and Reel |
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