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 s 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).
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· Ambient Temperature Monitoring (AD7816)· Thermostat and Fan Control· High Speed Microprocessor· Temperature Measurement and Control· Data Acquisition Systems with Ambient Temperature· Monitoring (AD7817 and AD7818)· Industrial Process Control· Automotive· Battery Charging Applications
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` 10-Bit ADC with 9 s 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 2 Error from 40 to +8555 to +125 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%)` Overtemperature Indicator` Automatic Power-Down at the End of a Conversion` Low Power Operation- 4 W at a Throughput Rate of 10 SPS- 40 W at a Throughput Rate of 1 kSPS- 400 W at a Throughput Rate of 10 kSPS` Flexible Serial Interface
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VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
VDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
Analog Input Voltage to AGND
VIN1 to VIN4 . . . . . . . . . . . . . . . . . . .0.3 V to VDD + 0.3 V
Reference Input Voltage to AGND2 . .0.3 V to VDD + 0.3 V
Digital Input Voltage to DGND . . . . . 0.3 V to VDD + 0.3 V
Digital Output Voltage to DGND . . . . 0.3 V to VDD + 0.3 V
Storage Temperature Range . . . . . . . . . 65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150°C
TSSOP, Power Dissipation . . . . . . . . . . . . . . . . . . .450 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . 120°C/W
Lead Temperature, Soldering . . . . . . . . . . . . . . . . . 260°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
16-Lead SOIC Package, Power Dissipation . . . . . 450 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . 100°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
8-Lead SOIC Package, Power Dissipation . . . . . . 450 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . . 157°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . .215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
SOIC Package, Power Dissipation . . . . . . . . . . .450 mW
JA Thermal Impedance . . . . . . . . . . . . . . . . . . .206°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . .215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
Post a Buying Lead
Required Field 
