AD7818 Temperature Sensor (On-Chip) Single-Channel, 9 µs, 10-Bit ADC

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

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

Analog to Digital Converters

A/D Converters

Data Sheets

Document	note
AD7817/AD7818: Dual, Low Power CMOS, Analog Front End with DSP Microcomputer Data Sheet (Rev. E)	PDF 1580 kB

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD7818ARM Production	8 ld MSOP	OTH 50	-40 to 85C	0	0	N
AD7818ARMZ Production	8 ld MSOP	OTH 50	-40 to 85C	3.84	3	Y
AD7818ARMZ-REEL Production	8 ld MSOP	REEL 3000	-40 to 85C	0	3	Y
AD7818ARMZ-REEL7 Production	8 ld MSOP	REEL 1000	-40 to 85C	0	3	Y
AD7818ARZ-REEL7 Production	8 ld SOIC	REEL 1000	-40 to 85C	0	3	Y

Reference Materials

Technical Articles：MS-2210: Designing Power Supplies for High Speed ADC

AD7817/AD7818: Dual, Low Power CMOS, Analog Front End with DSP Microcomputer Data Sheet (Rev. E) ad7818

MS-2210：高速ADC的电源设计 ad9861