Datasheet > PGA281

PGA281

更新时间： 2025-11-03 12:02:39

品牌	Logo	应用领域
德州仪器 - TI		仪表放大器
页数	文件大小	规格书
32页	2049K
描述
Precision, Zero-Drift, High-Voltage, Programmable Gain Instrumentation Amplifier

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PGA281 数据手册

PGA281

SBOS664A –MARCH 2013–REVISED JUNE 2013

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Output Filter

The PGA281 uses a chopper-stabilized architecture for excellent dc stability over temperature and life of

operation. The device also removes 1/f frequency (flicker) noise, and therefore enables both high resolution and

high repeatability for dc measurements. Although the chopper noise components are internally filtered, a minimal

residual amount of high-frequency switching noise appears at the signal outputs. Placing an external, passive,

low-pass filter after the output stage is recommended to remove this switching noise; Figure 42 shows two

examples. This filter can also be used to isolate or decouple the charge switching pulses of an ADC input.

R₁

R₃

50 W

100 W

VOP

VON

VOP

VON

C₁

R₂

R₄

10 nF

50 W

100 W

C₂

10 nF

C₃

10 nF

Figure 42. Typical Examples of Recommended Output Filters

Single-Ended Output

The output stage of the PGA281 is designed for highest precision. The fully-differential output avoids grounding

errors and noise, and delivers twice the signal amplitude compared to single-ended signals. However, if desired,

a single-ended output (VOP or VON) can be measured, referred to the voltage at the VOCM pin. The output

stage errors now relate to half the signal amplitude and half the signal gain. Figure 43 shows how the unused

output is unconnected, but not disconnected from error detection. The usable voltage range for the VOCM input

is specified in the Electrical Characteristics and must be observed; that is, the output swing (of both outputs)

should not saturate to the supply. Separate specifications for offset voltage and drift indicate higher offset voltage

at lower gains because some error sources are not cancelled in the output stage connected in single-ended

mode. Note that the gain is one-half of the gain set in reference to the gain table (see Table 1).

15 V

+5 V

2.5 V

ADC

PGA281

-15 V

Figure 43. Single-Ended Connection Example

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与PGA281相关器件

型号	品牌	获取价格	描述	数据表
PGA281AIPW	TI	获取价格	Precision, Zero-Drift, High-Voltage, Programmable Gain Instrumentation Amplifier
PGA281AIPWR	TI	获取价格	Precision, Zero-Drift, High-Voltage, Programmable Gain Instrumentation Amplifier
PGA281M622C1-1921F	AMPHENOL	获取价格	IC Socket, PGA281, 281 Contact(s), 2.54mm Term Pitch, 0.1inch Row Spacing,
PGA281M623C1-1921F	AMPHENOL	获取价格	IC Socket, PGA281, 281 Contact(s), 2.54mm Term Pitch , 0.1inch Row Spacing
PGA289M622C1-1701F	AMPHENOL	获取价格	IC Socket, PGA289, 289 Contact(s), 2.54mm Term Pitch , 0.1inch Row Spacing
PGA289M623C1-1701F	AMPHENOL	获取价格	IC Socket, PGA289, 289 Contact(s), 2.54mm Term Pitch , 0.1inch Row Spacing
PGA299H003B1-2010R	AMPHENOL	获取价格	IC Socket, PGA299, 299 Contact(s)
PGA299H004B1-2010R	AMPHENOL	获取价格	IC Socket, PGA299, 299 Contact(s)
PGA299H008B5-2010R	AMPHENOL	获取价格	IC Socket, PGA299, 299 Contact(s),
PGA299H009B5-2010R	AMPHENOL	获取价格	IC Socket, PGA299, 299 Contact(s)

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