Texas Instruments AFE1256GBTD

Description
The AFE1256 is a 256-channel analog front-end (AFE) designed for flat-panel detectors (FPDs) in digital X-ray systems. It features 256 integrators, a programmable gain amplifier (PGA), a correlated double sampler (CDS), analog multiplexers, and four 16-bit analog-to-digital converters (ADCs). The device allows for the integration of positive or negative charge and provides flexibility in system design. It also has a Nap feature for power saving. The AFE1256 is available as a gold-bumped die, a chip-on-film (COF) TDQ package, and a COF-314 TDS package.

Features
256 channels
On-chip, 16-bit ADC
Photodiode short immunity
Column short immunity
High performance:
Noise: 758 e-RMS with 28-pF sensor capacitor in 1.2-pC range
Integral nonlinearity: 2 LSB with internal 16-bit ADC
Minimum scan time: 37.9 us in normal mode, 20 μs in 2x binning mode
Integration:
Eight selectable full-scale ranges: 0.15 pC (min) to 9.6 pC (max)
Built-in correlated double sampler
2x binning (averages charge of two adjacent channels) for faster throughput
Pipelined integrate and read: allows data read during integration
Flexibility:
Electron and hole integration
Low power:
2.9 mW/Ch with ADC
2.3 mW/Ch without ADC
0.1 mW/Ch in Nap mode
Total power-down feature
22-mm x 5-mm gold-bumped die, suitable for TCP and COF2 application

Applications
Flat-panel, X-ray detectors