AD7798BRU Ver la hoja de datos (PDF) - Analog Devices

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AD7798BRU

3 V/5 V/ CMOS/ 500 uA Signal Conditioning ADC

Analog Devices 

Preliminary Technical Information

AD7799

Table shows the AD7799’s output rms noise for some of the

update rates and gain settings. The numbers given are for the

bipolar input range with a 5 V reference. These numbers are

typical and are generated with a differential input voltage of 0 V.

Table shows the effective resolution, while the output peak-to-

peak resolution is given in . It is important to note that the

AD7798/AD7799

effective resolution is calculated using the rms noise while the

p-p resolution is calculated based on peak-to-peak noise. The p-

p resolution represents the resolution for which there will be no

code flicker. These numbers are typical and are rounded to the

nearest LSB.

Table 7. Output RMS Noise (µV) vs. Gain and Output Update Rate for the AD7799 Using a 5 V Reference

Update Rate Gain of 1 Gain of 2

Gain of 4

Gain of 8

Gain of 16 Gain of 32 Gain of 64

4.17 Hz

8.33 Hz

16.7 Hz

33.3 Hz

62.5 Hz

125 Hz

250 Hz

500 Hz

Gain of 128

Table 8. Typical Resolution (Bits) vs. Gain and Output Update Rate for the AD7799 Using a 5 V Reference

Update Rate Gain of 1 Gain of 2

Gain of 4

Gain of 8

Gain of 16 Gain of 32 Gain of 64

4.17 Hz

8.33 Hz

16.7 Hz

33.3 Hz

62.5 Hz

125 Hz

250 Hz

500 Hz

Gain of 128

Pr.E 10/04 | Page 11 of 28

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