AD8488: 128-Channel Digital X-Ray Analog Front End Data Sheet (Rev. A)6/14/2012350 kB
Features and Benefits
- 128 integrator channels
- Correlated double sample error correction (CDS)
- Corrects for VOS and LF noise
- Power consumption/channel
- Normal: 11 mW
- Low power: 4 mW
- Low input leakage current
- 1.5 pA typical
- Low input referred noise (QNI)
- 1000 e−rms typ
- 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 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 channel addresses.
The AD8488 is packaged in a 17 mm × 17 mm 255-lead RoHS compliant ball grid array (BGA). The operating temperature range is 0°C to 85°C ambient.
- High performance digital X-ray systems
- Medical X-ray
- Security (baggage scanner) systems
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