AD7658 Analog Devices, AD7658 Datasheet - Page 19
![no-image](/images/manufacturer_photos/0/0/56/analog_devices_sml.jpg)
AD7658
Manufacturer Part Number
AD7658
Description
250 kSPS, 6-Channel,SimultaneousSampling, Bipolar 12-Bit A/D Converter
Manufacturer
Analog Devices
Datasheet
1.AD7656.pdf
(32 pages)
Specifications of AD7658
Resolution (bits)
12bit
# Chan
6
Sample Rate
250kSPS
Interface
Par,Ser,SPI
Analog Input Type
SE-Bip
Ain Range
Bip (Vref) x 2,Bip (Vref) x 4,Bip 10V,Bip 5.0V
Adc Architecture
SAR
Pkg Type
QFP
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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 V
where:
Pf is equal to the power at frequency f in the ADC output.
Pf
and V
S
is equal to the power at frequency f
PSRR (dB) = 10 log (Pf/Pf
SS
supplies.
DD
and V
SS
supplies of frequency f
S
)
S
coupled onto the V
S
DD
Rev. C | Page 19 of 32
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.
AD7656/AD7657/AD7658