DDC2256A Texas instruments

DDC2256A

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DDC2256A

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Описание

The DDC2256A is a 24-bit, 256-channel, current-input analog-to-digital (A/D) converter. It combines both current-to-voltage integration and A/D conversion so that 256 individual low-level current output devices, such as photodiodes, can be directly connected to its inputs and digitized in parallel (simultaneously). For each of the inputs, the DDC2256A has one low noise/low power integrator designed to capture all the charge from the sensor. The integration time is adjustable from 58.8μs to 100 ms, allowing currents from fA to µA to be continuously measured with outstanding precision. The outputs of the integrators are digitized by sixteen 24-bit low power ADCs and all the resulting data is output over a single LVDS serial interface pair designed to minimize noise coupling in environments with high channel count. The DDC2256A operates from ±2.5-V analog supply, 1.8-V analog supply (AVDD_18) and 1.8-V digital supply (DVDD). The device is specified from 0°C to 70°C operating temperature and available in a 14 × 16 mm2 323-ball 0.8 mm-pitch BGA. Finally, the on board reference buffer and bypass capacitors help minimize the external component requirements and further reduce board space. To request a full data sheet or other design resources: request DDC2256A

Single-Chip Solution to Directly Measure 256 Low-
Level Currents Simultaneously
User Adjustable Full-Scale Range
Adjustable Speed with Integration Times as Low
as 58.8 µs (17 KSPS per channel) with 24 bit
Resolution
Power Dissipation as Low as 1.7mW/channel
Integral Linearity: ±0.025% of Reading ±1 ppm of
Full Scale Reading (all channels active)
Low Noise
24 bit ADC
No Charge Loss and Simultaneous Sampling
On-board Temperature Sensor
In-Package Bypass Capacitors and Reference
Buffer to Reduce PCB Area and Design Complexity
Serial LVDS and CMOS Output Interface Option

Number of input channels	256
Resolution (Bits)	24
Features	Computed Tomography (CT)
Operating temperature range (°C)	0 to 70
Interface type	LVDS/Serial
Rating	Catalog