AD7817ARZ-REEL7

双通道，低功耗CMOS ， DSP与单片机模拟前端 Dual, Low Power CMOS, Analog Front End with DSP Microcomputer

Product Details

The AD7818 and AD7817 are 10-bit, single- and 4-channel A/D converters with on-chip temperature sensor that can operate from a single 2.7 V to 5.5 V power supply. Each part contains a 9 μs successive-approximation converter based around a capacitor DAC, an on-chip temperature sensor with an accuracy of ±2°C, an on-chip clock oscillator, inherent track-andhold functionality and an on-chip reference 2.5 V. The AD7816 is a temperature monitoring only device in a SOIC/MSOP package.

The on-chip temperature sensor of the AD7817 and AD7818 can be accessed via Channel 0. When Channel 0 is selected and a conversion is initiated, the resulting ADC code at the end of the conversion gives a measurement of the ambient temperature with a resolution of ±0.25°C. See Temperature Measurement section of this data sheet.

The AD7816, AD7817, and AD7818 have a flexible serial interface that allows easy interfacing to most microcontrollers. The interface is compatible with the Intel 8051, Motorola SPI® and QSPI™ protocols and National Semiconductors MICROWIRE™ protocol. For more information refer to the Serial Interface section of this data sheet.

The AD7817 is available in a narrow body 0.15" 16-lead small outline IC SOIC, in a 16-lead, thin shrink small outline package TSSOP, while the AD7816/AD7818 come in an 8-lead small outline IC SOIC and an 8-lead microsmall outline IC MSOP.

### Features and Benefits

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10-Bit ADC with 9 µs Conversion Time

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One AD7818 and Four AD7817 Single-Ended Analog Input Channels

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The AD7816 Is a Temperature Measurement Only Device

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On-Chip Temperature Sensor

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Resolution of 0.25°C

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±2°C Error from -40°C to +85°C

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-55°C to +125°C Operating Range

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Wide Operating Supply Range 2.7 V to 5.5 V

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Inherent Track-and-Hold Functionality

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On-Chip Reference 2.5 V ± 1%

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Over-Temperature Indicator

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Automatic Power-Down at the End of a Conversion

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Low Power Operation

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4 µW at a Throughput Rate of 10 SPS

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40 µW at a Throughput Rate of 1 kSPS

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400 µW at a Throughput Rate of 10 kSPS

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Flexible Serial Interface