ADS7870 - 12 位 ADC、MUX、PGA 和内部参考数据采集系统

ADS7870是TI德州仪器公司的一款精密ADC(<=10MSPS)产品，ADS7870是12 位 ADC、MUX、PGA 和内部参考数据采集系统，本站介绍了ADS7870的封装应用图解、特点和优点、功能等，并给出了与ADS7870相关的TI元器件型号供参考。

ADS7870 - 12 位 ADC、MUX、PGA 和内部参考数据采集系统 - 精密ADC(<=10MSPS) - 模数转换器 - 德州仪器

产品描述

The ADS7870 (US patents 6140872, 6060874) is a complete low-power data acquisition system on a single chip. It consists of a 4-channel differential/8-channel single-ended multiplexer, precision programmable gain amplifier, 12-bit successive approximation analog-to-digital (A/D) converter, and a precision voltage reference.

The programmable-gain amplifier provides high input impedance, excellent gain accuracy, good common-mode rejection, and low noise.

For many low-level signals, no external amplification or impedance buffering is needed between the signal source and the A/D input.

The offset voltage of the PGA is auto zeroed. Gains of 1, 2, 4, 5, 8, 10, 16, and 20 V/V allow signals as low as 125 mV to produce full-scale digital outputs.

The ADS7870 contains an internal reference, which is trimmed for high initial accuracy and stability vs temperature. Drift is typically 10 ppm/°C. An external reference can be used in situations where multiple ADS7870s share a common reference.

The serial interface allows the use of SPI™, QSPI™, Microwire™, and 8051-family protocols, without glue logic.

产品特性

PGA Gains: 1, 2, 4, 5, 8, 10, 16, 20V/V
Programmable Input (Up to 4-channel Differential/Up to 8-channel Single-Ended or Some Combination)
1.15-V, 2.048-V or 2.5-V Internal Reference
SPI/DSP Compatible Serial Interface (≤20 MHz)
Throughput Rate: 52 kSamples/sec
Error/Overload Indicator
Programmable Output 2s Complement/Binary
2.7-V to 5.5-V Single-Supply Operation
4-Bit Digital I/O Via Serial Interface
Pin Compatible With ADS7871
SSOP-28 Package
APPLICATIONS
- Portable Battery-Powered Systems
- Low-Power Instrumentation
- Low-Power Control Systems
- Smart Sensor Applications

QSPI and SPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corporation. All other trademarks are the property of their respective owners.

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