Analog Devices Inc. AD7902 模数转换器
ADI AD7902 模数转换器是一款双通道 16 位、逐次逼近型模数转换器(ADC)，各模数转换器采用单电源 VDDx 进行供电。其内含 2 个低功耗、高速、16 位采样模数转换器和 1 个多功能串行端口（SPI）。AD7902 在 CNVx 上升沿对 IN+ 与参考地 IN− 之间的模拟输入电压进行采样，范围从 0V 至 VREF。REFx 引脚的基准电压(VREF)由外部提供，可独立于电源电压引脚(VDDx）进行设置。该器件的功耗与吞吐速率呈线性变化关系。SPI 兼容串行接口还能利用 SDIx 输入将几个模数转换器以菊花链形式连结到单个三线式总线上，并提供一个可选的繁忙指示。采用独立电源 VIOx 时，它与 1.8V、2.5V、3V 和 5V 逻辑兼容。
The externally applied reference voltage of the REFx pins (VREF) can be set independently from the supply voltage pins, VDDx. The power of the device scales linearly with throughput. Using the SDIx inputs, the SPI-compatible serial interface can also daisy-chain multiple ADCs on a single 3-wire bus and provide an optional busy indicator. It is compatible with 1.8V, 2.5V, 3V, or 5V logic, using the separate VIOx supplies.
特性
- 16-bit resolution with no missing codes
- Throughput: 1MSPS
- Low power dissipation
- 7.0mW at 1MSPS (VDD1 and VDD2 only)
- 12.0mW at 1MSPS (total)
- 140μW at 10kSPS
- INL: ±1.0 LSB typical, ±2.5 LSB maximum
- SINAD: 91dB at 1kHz
- THD: −105 dB at 1kHz
- Pseudo-differential analog input range
- 0V to VREF with VREF between 2.4V to 5.1V
- Allows use of any input range
- Easy to drive with the ADA4841-x
- No pipeline delay
- Single-supply 2.5V operation with 1.8V/2.5V/3V/5V logic interface
- Serial port interface (SPI) QSPI/MICROWIRE/DSP compatible
- 20-lead QSOP package
- Wide operating temperature range: −40°C to +125°C
应用
- Battery-powered equipment
- Communications
- Automated test equipment (ATE)
- Data acquisition
- Medical instrumentation
- Redundant measurement
- Simultaneous sampling
Block Diagram
视频
发布日期: 2014-04-21
| 更新日期: 2022-03-11