●The AFE2256 is a 256-channel, analog front-end (AFE) designed to suit the requirements of flat-panel detector (FPD)-based digital x-ray systems. The device includes 256 integrators , a programmable gain amplifier (PGA) for full-scale charge level selection, a correlated double sampler (CDS) with dual banking, and 256:4 analog multiplexers.
●The device also features four 16-bit successive-approximation register (SAR) analog-to-digital converters (ADCs). Serial data from the ADCs are available in low-voltage differential signaling (LVDS) format.
●The Nap and power-down modes enable substantial power saving that is especially useful in battery-powered systems.
●To request a full datasheet or other design resources: request AFE2256
● 256 Channels
● On-Chip, 16-Bit ADC
● Photodiode Short Immunity
● High Performance:
● Noise: 750 Electrons RMS
●(1.2-pC Input Charge Range)
● Low Correlated Noise
● Integral Nonlinearity:
●±2 LSB with Internal 16-Bit ADC
● Scan Time:
● < 20 µs to 204.8 µs
● Integration:
● Six Selectable, Full-Scale Input Ranges:
●0.6 pC (Min) to 9.6 pC (Max)
● Internal Timing Generator (TG)
● Built-In Correlated Double Sampler
● Pipelined Integrate and Read for Improved
●Throughput: Allows Data Read During
●Integration
● Serial LVDS Output
● Simple Power-Supply Scheme:
● AVDD1 = 1.85 V
● AVDD2 = 3.3 V
● Low Power Consumption
● Nap and Total Power-Down Mode
● Custom Chip-On-Film (COF) Packages
