256-channel analog front end (AFE) for digital X-ray flat-panel detectors w/ HD capacitor
Product details
Parameters
Package | Pins | Size
Features
- 256 Channels
- On-chip, 16-bit ADC
- Photodiode short immunity
- High performance:
- Noise: < 600 electrons
- Low correlated noise
- Full-channel integral nonlinearity:
±2 LSB with internal 16-Bit ADC - Scan time: < 20 µs to > 250 µs
- Integration:
- Programmable full-scale input charge range:
< 1 pC to > 25 pC - Internal timing generator (TG)
- Built-in correlated double sampler
- Pipelined integrate-and-read for improved throughput—data-read during integration
- Serial LVDS output
- Programmable full-scale input charge range:
- Simple power-supply scheme:
- AVDD1 = 1.85 V
- AVDD2 = 3.3 V or 4.75 V
- Low power consumption
- Nap and total power-down modes
- Pin compatible to AFE2256
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Description
The AFE2257 is a 256-channel charge readout IC (ROIC) designed for flat-panel detector (FPD) based digital x-ray systems. The device includes 256 integrators, correlated double samplers (CDSs) 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 device optimizes the overall x-ray system performance using features such as multiple power modes and in-system debug options. The nap and power-down modes enable substantial power savings, and are especially useful in battery-powered systems.
More information
Full data sheet and other design resources are available under NDA. Request now
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | AFE2257 256-Channel, analog front-end for digital X-ray, flat-panel detectors datasheet | Mar. 15, 2019 |
Technical article | Offset correction improves the next generation of heart-rate smart watches | Aug. 24, 2015 | |
Technical article | A new way to illuminate the human condition | Dec. 30, 2013 | |
Technical article | Oximeter signaling: There’s more than meets the eye | Dec. 04, 2013 | |
Technical article | Virtual hospital implementation using a worn health monitor | Nov. 13, 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The AFE2256EVM is a compact USB based evaluation kit for evaluating the AFE2256 COF, a 256-channel analog front-end. The EVM is self-contained with DACs and power generation on-board which greatly reduces its dependency on external equipment. The kit consists of an EVM and two separate COF adapters (...)
Features
- Allows quick evaluation of AFE2256 COF devices (externally detachable)
- GUI software allows easy control of AFE2256 device modes and functions
- On board 3.3V and 1.8V DUT power generation
- On board FPGA based pattern generation and data acquisition
- Communicates with Personal Computer through a USB 2.0 (...)
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
COF (TDU) | 320 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Support & training
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