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.

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

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