Datasheet Analog Devices AD8488

128-Channel
Digital X-Ray Analog Front End
AD8488 Data Sheet
FEATURES GENERAL DESCRIPTION 128 integrator channels
Correlated double sample error correction (CDS)
Corrects for VOS and LF noise
Power consumption per channel
Normal: 11 mW
Low power: 4 mW
Low input leakage current: −1.5 pA typical
Low input referred noise (QNI): 993 e−rms typical
Linearity error: 0.03% typical
Compact 17 mm × 17 mm BGA
Selectable filter time constants
4 selectable input charge ranges
10 selectable gain ranges The AD8488 is a 128-channel, analog front end (AFE) designed for
use in high performance digital X-ray systems. The analog channels
consist of an integrator followed by a gain selectable single-ended
to low impedance differential output. The analog channel converts
the charge acquired by X-ray or photodiode detectors to a voltage.
The channels are composed of CMOS transistors, using typical
high input impedance CMOS gates. The integrators generate charge
dependent voltages using a range of selectable capacitance values that …