AFE2257 Texas instruments

AFE2257

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AFE2257

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Описание

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.

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
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

Number of input channels	256
Resolution (Bits)	16
Features	Internal Reference Buffer, Nap Mode, Power Down, X-ray
Interface type	SPI/LVDS
Operating temperature range (°C)	0 to 85
Rating	Catalog