AD7658BSTZ datasheet(19/32 Pages) AD

Part #	AD7658BSTZ

Description	250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-/14-/12-Bit ADC

PDF	32 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

Logo

19 / 32 page

Data Sheet

AD7656/AD7657/AD7658

Rev. D | Page 19 of 32

Figure 19 shows the power supply rejection ratio vs. supply

ripple frequency for the AD7656/AD7657/AD7658.

The power supply rejection ratio is defined as the ratio

of the power in the ADC output at full-scale frequency, f,

to the power of a 200 mV p-p sine wave applied to the

ADC’s VDD and VSS supplies of frequency fS

PSRR (dB) = 10 log (Pf/PfS)

where:

Pf is equal to the power at frequency f in the ADC output.

PfS is equal to the power at frequency fS coupled onto the VDD

and VSS supplies.

Channel-to-Channel Isolation

Channel-to-channel isolation is a measure of the level of crosstalk

between any two channels. It is measured by applying a full-scale,

100 kHz sine wave signal to all unselected input channels and

determining the degree to which the signal attenuates in the

selected channel with a 30 kHz signal.

% FSR

%FSR is calculated using the full theoretical span of the ADC.

AD7658BSTZ Datasheet(PDF) 19 Page - Analog Devices