AD7780 datasheet(11/17 Pages) AD

Part #	AD7780

Description	24-Bit, Pin-Programmable, Ultralow Power Sigma-Delta ADC

PDF	17 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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11 / 17 page

AD7780

Rev. A | Page 10 of 16

OUTPUT NOISE AND RESOLUTION

Table 7 and Table 8 show the rms noise of the AD7780 for the two output data rates and gain settings when 3 V and 5 V references are used.

These numbers are typical and are generated using a differential input voltage of 0 V. The corresponding peak-to-peak (p-p) resolution is

also listed. The p-p resolution represents the resolution for which there is no code flicker.

Table 7. RMS Noise and Peak-to-Peak Resolution when AVDD = 3 V and VREF = 3 V

Parameter

Gain = 128

Gain = 1

Update Rate

10 Hz

16.7 Hz

10 Hz

16.7 Hz

RMS Noise

44 nV

65 nV

2.4 μV

2.7 μV

P-P Resolution

17.6

17.1

18.8

18.7

Table 8. RMS Noise and Peak-to-Peak Resolution when AVDD = 5 V and VREF = 5 V

Parameter

Gain = 128

Gain = 1

Update Rate

10 Hz

16.7 Hz

10 Hz

16.7 Hz

RMS Noise

49 nV

69 nV

3 μV

2.7 μV

P-P Resolution

18.2

17.7

19.3

19.4

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