Datasheet > AD629_07

AD629_07

更新时间： 2024-10-28 04:04:11

品牌	Logo	应用领域
亚德诺 - ADI		放大器
页数	文件大小	规格书
16页	533K
描述
High Common-Mode Voltage, Difference Amplifier

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中文翻译

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数据手册

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AD629_07 数据手册

AD629

OUTPUT CURRENT AND BUFFERING

ERROR BUDGET ANALYSIS EXAMPLE 1

The AD629 is designed to drive loads of 2 kꢂ to within 2 ꢁ of

the rails but can deliver higher output currents at lower output

voltages (see Figure 1±). If higher output current is required, the

output of the AD629 should be buffered with a precision op amp,

such as the OP113, as shown in Figure 36. This op amp can swing

to within 1 ꢁ of either rail while driving a load as small as 677 ꢂ.

In the dc application that follows, the 17 A output current from

a device with a high common-mode voltage (such as a power

supply or current-mode amplifier) is sensed across a 1 ꢂ shunt

resistor (see Figure 38). The common-mode voltage is 277 ꢁ,

and the resistor terminals are connected through a long pair of

lead wires located in a high noise environment, for example,

±7 Hz/67 Hz, 447 ꢁ ac power lines. The calculations in Table ±

assume an induced noise level of 1 ꢁ at 67 Hz on the leads, in

addition to a full-scale dc differential voltage of 17 ꢁ. The error

budget table quantifies the contribution of each error source.

Note that the dominant error source in this example is due to

the dc common-mode voltage.

AD629

REF (–)

21.1kΩ

0.1µF

380kΩ 380kΩ

–IN

+IN

0.1µF

380kΩ

OP113

OUT

20kΩ

REF (+)

–V

OUTPUT

CURRENT

AD629

REF (–)

21.1kΩ

0.1µF

–V

10 AMPS

200V DC

TO GROUND

NC = NO CONNECT

380kΩ 380kΩ

–IN

+IN

Figure 36. Output Buffering Application

0.1µF

1Ω

SHUNT

380kΩ

A GAIN OF 19 DIFFERENTIAL AMPLIFIER

OUT

While low level signals can be connected directly to the –IN and

+IN inputs of the AD629, differential input signals can also be

connected, as shown in Figure 3ꢀ, to give a precise gain of 19.

However, large common-mode voltages are no longer permissible.

Cold junction compensation can be implemented using a

temperature sensor, such as the AD±97.

20kΩ

REF (+)

–V

60Hz

0.1µF

POWER LINE

NC = NO CONNECT

Figure 38. Error Budget Analysis Example 1: V_IN= 10 V Full-Scale,

V_CM= 200 V DC, R_SHUNT= 1 Ω, 1 V p-p, 60 Hz Power-Line Interference

AD629

REF (–)

21.1kΩ

THERMOCOUPLE

380kΩ 380kΩ

–IN

+IN

0.1µF

380kΩ

OUT

REF

20kΩ

REF (+)

NC = NO CONNECT

Figure 37. A Gain of 19 Thermocouple Amplifier

Table 5. AD629 vs. INA117 Error Budget Analysis Example 1 (V_CM= 200 V dc)

Error, ppm of FS

Error Source

AD629

INA117

AD629

INA117

ACCURACY, T_A= 25°C

Initial Gain Error

(ꢀ.ꢀꢀꢀ5 × 1ꢀ)/1ꢀ V × 1ꢀ⁶

(ꢀ.ꢀꢀ1 V/1ꢀ V) × 1ꢀ⁶

(224 × 1ꢀ^-6× 2ꢀꢀ V)/1ꢀ V × 1ꢀ⁶

(ꢀ.ꢀꢀꢀ5 × 1ꢀ)/1ꢀ V × 1ꢀ⁶

(ꢀ.ꢀꢀ2 V/1ꢀ V) × 1ꢀ⁶

5ꢀꢀ

1ꢀꢀ

448ꢀ

5ꢀ8ꢀ

5ꢀꢀ

2ꢀꢀ

1ꢀ,ꢀꢀꢀ

1ꢀ,7ꢀꢀ

Offset Voltage

DC CMR (Over Temperature)

(5ꢀꢀ × 1ꢀ^-6× 2ꢀꢀ V)/1ꢀ V × 1ꢀ⁶

Total Accuracy Error

TEMPERATURE DRIFT (85°C)

Gain

1ꢀ ppm/°C × 6ꢀ°C

(2ꢀ μV/°C × 6ꢀ°C) × 1ꢀ⁶/1ꢀ V

1ꢀ ppm/°C × 6ꢀ°C

6ꢀꢀ

12ꢀ

72ꢀ

6ꢀꢀ

24ꢀ

84ꢀ

Offset Voltage

(4ꢀ μV/°C × 6ꢀ°C) × 1ꢀ⁶/1ꢀ V

Total Drift Error

RESOLUTION

Noise, Typical, ꢀ.ꢀ1 Hz to 1ꢀ Hz, μV p-p

CMR, 6ꢀ Hz

Nonlinearity

15 μV/1ꢀ V × 1ꢀ⁶

(141 × 1ꢀ^-6× 1 V)/1ꢀ V × 1ꢀ⁶

(1ꢀ^-5× 1ꢀ V)/1ꢀ V × 1ꢀ⁶

25 μV/1ꢀ V × 1ꢀ⁶

(5ꢀꢀ × 1ꢀ^-6× 1 V)/1ꢀ V × 1ꢀ⁶

(1ꢀ^-5× 1ꢀ V)/1ꢀ V × 1ꢀ⁶

Total Resolution Error

Total Error

5ꢀ

1ꢀ

5826

11,6ꢀ3

Rev. B | Page 12 of 16

1...9 10 111213 14 15 16

中文翻译

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与AD629_07相关器件

型号	品牌	获取价格	描述	数据表
AD629A	ADI	获取价格	High Common-Mode Voltage Difference Amplifier
AD629AN	ADI	获取价格	High Common-Mode Voltage Difference Amplifier
AD629ANZ	ADI	获取价格	High Common-Mode Voltage, Difference Amplifier
AD629AR	ADI	获取价格	High Common-Mode Voltage Difference Amplifier
AD629AR-REEL	ADI	获取价格	High Common-Mode Voltage Difference Amplifier
AD629AR-REEL7	ADI	获取价格	High Common-Mode Voltage Difference Amplifier
AD629ARZ	ADI	获取价格	High Common-Mode Voltage, Difference Amplifier
AD629ARZ-R7	ADI	获取价格	High Common-Mode Voltage, Difference Amplifier
AD629ARZ-REEL	ADI	获取价格	OP-AMP, 1000uV OFFSET-MAX, PDSO8, PLASTIC, MS-012AA, SOIC-8
AD629ARZ-REEL7	ADI	获取价格	OP-AMP, 1000uV OFFSET-MAX, PDSO8, PLASTIC, MS-012AA, SOIC-8

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