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 accommodate a broad range of input charge values. The integrators
are followed by single-ended input to differential output voltage amplifiers where offset and low frequency noise voltages are
subtracted from the input voltages. A 128:1 channel differential
MUX follows the buffers and drives the analog output buffer.
Switch drivers and certain digital timing functions are included, and
all are mounted on a 255-lead BGA substrate. Charge conversion for all 128 channels is simultaneous followed by a sequential voltage
output read of the channels using a 7-bit address code. The sequence
occurs twice, sampling all 128 channels. Logic control inputs, CS_A
and CS_B, select the lower and upper 64 blocks of the channel addresses.

 

The AD8488 is packaged in a 17 mm × 17 mm, 255-lead, RoHScompliant ball grid array (BGA). The operating temperature range
is 0°C to 85°C ambient.

Companies Website:
http://components-asiapac.arrow.com/en/new_product/4779/

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