LMP7731 datasheet(17/26 Pages) TI

tên linh kiện	LMP7731

Giải thích chi tiết về linh kiện	2.9 nV/sqrt(Hz) Low Noise, Precision, RRIO Amplifier

PDF	26 Pages

Scroll/Zoom	100%

nhà sản xuất	TI [Texas Instruments]

Trang chủ	http://www.ti.com

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17 / 26 page

ADC

SENSOR

INPUT

NETWORK

FEEDBACK

NETWORK

SENSOR

INPUT

NETWORK

FEEDBACK

NETWORK

ADC

(a)

(b)

RISO

LMP7731

www.ti.com

SNOSAT6E – JULY 2007 – REVISED MARCH 2013

ADC's sampling capacitor. Since this large capacitor will be loading the output of the amplifier as well, an

isolation resistor is needed between the output of the amplifier and this capacitor. The isolation resistor, RISO,

separates the additional load capacitance from the output of the amplifier and will also form a low-pass filter and

can be designed to provide noise reduction as well as anti-aliasing. The drawback to having RISO is that it

reduces signal swing since there is some voltage drop across it.

Figure 49 (a) shows the ADC directly connected to the amplifier. To minimize the glitch in this setting, a slower

sample rate needs to be used. Figure 49 (b) shows RISO and an external capacitor used to minimize the glitch.

Figure 49. Driving an ADC

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