AFE2256 Datasheet, PDF (1/6 Pages) Texas Instruments – 256-Channel, Analog Front-End for Digital X-Ray, Flat-Panel Detectors

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AFE2256
SBAS693A – MARCH 2015 – REVISED JULY 2015
AFE2256 256-Channel, Analog Front-End for Digital X-Ray, Flat-Panel Detectors
1 Features
•1 256 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
2 Applications
• Flat-Panel, X-Ray Detectors
• Charge Detectors
• Capacitance Measurement
3 Description
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.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
AFE2256
COF (320)
38.00 mm × 28.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
AFE2256 Schematic
VREF
Reference
Voltage
AFE2256
TFT Switch
Pixel Cap
[255:0]
Integrators
and CDS
255-0
MUX
16-Bit
ADC[3:0]
ADC
AADDCC
LVDS
Serializer
DCLK_P,
DCLK_M
DOUT_P,
DOUT_M
FCLK_P,
FCLK_M
Timing and Control
SPI
MCLK, SYNC, TP_SEL
SDATA, SDOUT, SCLK, SEN
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.