The AD7818ARZ 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-and-holdfunctionality 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 AD7818ARZ 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 AD7818ARZ 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/AD7818ARZ come in an 8-lead small outline IC (SOIC) and an 8-lead microsmall outline IC (MSOP).
Feature
- 10-Bit ADC with 9 µs Conversion Time
- One (AD7818) and Four (AD7817) Single-Ended Analog Input Channels
- The AD7816 Is a Temperature Measurement Only Device
- On-Chip Temperature Sensor
- Resolution of 0.25°C
- ±2°C Error from -40°C to +85°C
- -55°C to +125°C Operating Range
- Wide Operating Supply Range 2.7 V to 5.5 V
- Inherent Track-and-Hold Functionality
- On-Chip Reference (2.5 V ± 1%)
- Over-Temperature Indicator
- Automatic Power-Down at the End of a Conversion
- Low Power Operation
- 4 µW at a Throughput Rate of 10 SPS
- 40 µW at a Throughput Rate of 1 kSPS
- 400 µW at a Throughput Rate of 10 kSPS
- Flexible Serial Interface
(Picture: Pinout)
