ADAS1131 256-Channel, 24-Bit Current-to-Digital ADC Module

The ADAS1131 is a 256-channel, current-to-digital analog-to- digital converter (ADC) module. It contains 256 low power, low noise, low input current integrators, simultaneous sample-and- holds, and two high speed, high resolution ADCs with configurable sampling rate and resolutions of up to 24 bits. The signal chain and sampling architecture of the ADAS1131 is designed to guarantee that all channels are simultaneously sampled, and that no charge is lost throughout the sampling process.

All converted channel results are output on a single, low voltage differential signaling (LVDS), self clocked serial interface, which reduces external hardware.

An SPI-compatible serial interface allows configuration of the ADC using the SDI_x input. The SDO_x output allows the user to daisy-chain several ADCs on a single, 3-wire bus. The ADAS1131 uses the separate supply, IOVDD, to reduce digital noise effect on the conversions.

The ADAS1131 is in a 15 mm × 15 mm, CSP_BGA package.

APPLICATIONS

Medical, industrial, and security CT scanner data acquisition
Photodiode sensors
Dosimetry and radiation therapy systems
Optical fiber power monitoring
X-ray detection systems
High channel-count data acquisition systems (current or voltage inputs)

Features and Benefits

256-channel, current-to-digital converter module

Up to 24-bit resolution

Variable integration time

Fastest integration time: 11.656 kSPS (86 μs) at 20-bit resolution

Fastest integration time: 11.656 kSPS (86 μs) at 20-bit resolution

Low power dissipation: 3 mW per channel at any throughput

Integral linearity

±0.015% of reading ±0.4 ppm of FSR: single channel active
±0.050% of reading ±1.0 ppm of FSR: all channels active

±0.015% of reading ±0.4 ppm of FSR: single channel active

±0.050% of reading ±1.0 ppm of FSR: all channels active

Very low noise

Simultaneous sampling

No dead time, no loss of charge, 100% charge collection

No dead time, no loss of charge, 100% charge collection

User adjustable full-scale range

On-board temperature sensor and reference buffer

15 mm × 15 mm, CSP_BGA package

Simple printed circuit board (PCB) design

Integrated capacitors for supply and reference decoupling
0.80 mm pitch BGA allows low cost PCB technology

Integrated capacitors for supply and reference decoupling

0.80 mm pitch BGA allows low cost PCB technology

Support tools

Evaluation board
Reference design with reference layout
FPGA Verilog code

Evaluation board

Reference design with reference layout

FPGA Verilog code

Application Specific

Computer Tomography (CT)

Healthcare

Imaging

Data Sheets

Document	note
ADAS1131: 256-Channel, 24-Bit Current-to-Digital ADC Module Data Sheet (Rev. Sp0)	PDF 56.8 K

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD8450ASTZ Production	80 ld LQFP (14x14mm)	OTH 90	-40 to 85C	8.34	6.95	Y
AD8450ASTZ-RL Production	80 ld LQFP (14x14mm)	REEL 1000	-40 to 85C	8.34	6.95	Y

Evaluation Boards

Part Number	Description	Price	RoHS
AD8450-EVALZ	Evaluation Board for 80-Lead LQFP package	260	Y

ADAS1131: 256-Channel, 24-Bit Current-to-Digital ADC Module Data Sheet (Rev. Sp0) adas1131