Overview
The DDC2256AZZF, produced by Texas Instruments, is a 24-bit, 256-channel, current-input analog-to-digital (A/D) converter. This device combines both current-to-voltage integration and A/D conversion, allowing it to directly measure 256 low-level currents simultaneously. It is designed to capture all the charge from sensors such as photodiodes, with adjustable integration times ranging from 58.8 µs to 100 ms. This flexibility enables the measurement of currents from femtoamperes to microamperes with high precision.
The DDC2256AZZF operates from ±2.5-V analog supply, 1.8-V analog supply (AVDD_18), and 1.8-V digital supply (DVDD), and is specified to operate from 0°C to 70°C. It is packaged in a 14 x 16 mm² 323-ball 0.8 mm-pitch NFBGA, which includes on-board reference buffer and bypass capacitors to minimize external component requirements and reduce board space.
Key Specifications
| Parameter | Description |
|---|---|
| Number of Channels | 256 |
| Resolution | 24 bits |
| Integration Time | 58.8 µs to 100 ms |
| Sample Rate per Channel | Up to 17 KSPS |
| Power Dissipation per Channel | As low as 1.7 mW |
| Integral Linearity | ±0.025% of Reading ±1 ppm of Full Scale Reading |
| Analog Supply Voltage | ±2.5 V, 1.8 V (AVDD_18) |
| Digital Supply Voltage | 1.8 V (DVDD) |
| Operating Temperature | 0°C to 70°C |
| Package Type | 323-ball 0.8 mm-pitch NFBGA |
| Package Size | 14 x 16 mm² |
Key Features
- 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.
- Low power dissipation as low as 1.7 mW/channel.
- High integral linearity: ±0.025% of Reading ±1 ppm of Full Scale Reading (all channels active).
- Low noise and no charge loss with 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.
Applications
- CT Scanner Data Acquisition System.
- Photodiode Sensors.
- X-ray Detection Systems.
- Optical Fiber Power Monitoring.
- Multichannel Current/Voltage Instrumentation.
Q & A
- What is the resolution of the DDC2256AZZF?
The DDC2256AZZF has a resolution of 24 bits.
- How many channels does the DDC2256AZZF support?
The DDC2256AZZF supports 256 channels.
- What is the adjustable integration time range of the DDC2256AZZF?
The integration time is adjustable from 58.8 µs to 100 ms.
- What is the power dissipation per channel of the DDC2256AZZF?
The power dissipation per channel is as low as 1.7 mW.
- What are the operating temperature ranges for the DDC2256AZZF?
The device operates from 0°C to 70°C.
- What type of package does the DDC2256AZZF come in?
The DDC2256AZZF is packaged in a 323-ball 0.8 mm-pitch NFBGA.
- Does the DDC2256AZZF have on-board temperature sensing?
Yes, the DDC2256AZZF includes an on-board temperature sensor.
- What are the typical applications of the DDC2256AZZF?
Typical applications include CT Scanner Data Acquisition Systems, Photodiode Sensors, X-ray Detection Systems, Optical Fiber Power Monitoring, and Multichannel Current/Voltage Instrumentation.
- Does the DDC2256AZZF support simultaneous sampling?
Yes, the DDC2256AZZF supports simultaneous sampling with no charge loss.
- What output interface options are available for the DDC2256AZZF?
The DDC2256AZZF offers serial LVDS and CMOS output interface options.
