ad7817br-reel7 Analog Devices, Inc., ad7817br-reel7 Datasheet

ad7817br-reel7

Manufacturer Part Number

ad7817br-reel7

Description

Single- And 4-channel, 9 Us, 10-bit Adcs With On-chip Temperature Sensor

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD7817BR-REEL7.pdf (20 pages)

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REV. C

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

GENERAL DESCRIPTION

The AD7818 and AD7817 are 10-bit, single- and 4-channel

A/D converters with on-chip temperature sensor that can oper-

ate from a single 2.7 V to 5.5 V power supply. Each part con-

tains a 9 µs successive-approximation converter based around

a capacitor DAC, an on-chip temperature sensor with an accu-

racy of

hold 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.

FEATURES

10-Bit ADC with 9

One (AD7818) and Four (AD7817) Single-Ended Analog

The AD7816 Is a Temperature Measurement Only Device

On-Chip Temperature Sensor

Wide Operating Supply Range

Inherent Track-and-Hold Functionality

On-Chip Reference (2.5 V

Overtemperature Indicator

Automatic Power-Down at the End of a Conversion

Low Power Operation

Flexible Serial Interface

APPLICATIONS

Ambient Temperature Monitoring (AD7816)

Data Acquisition Systems with Ambient Temperature

Input Channels

Resolution of 0.25 C

–55 C to +125 C Operating Range

2.7 V to 5.5 V

400

Thermostat and Fan Control

High Speed Microprocessor

Temperature Measurement and Control

Monitoring (AD7817 and AD7818)

2 C Error from –40 C to +85 C

Industrial Process Control

Automotive

Battery Charging Applications

W at a Throughput Rate of 10 SPS

2°C, an on-chip clock oscillator, inherent track-and-

W at a Throughput Rate of 1 kSPS

W at a Throughput Rate of 10 kSPS

s Conversion Time

1%)

Single- and 4-Channel, 9 s, 10-Bit ADCs

with On-Chip Temperature Sensor

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

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 pack-

age (TSSOP), while the AD7816/AD7818 come in an 8-lead

small outline IC (SOIC) and an 8-lead microsmall outline IC

(MSOP).

PRODUCT HIGHLIGHTS

1. The devices have an on-chip temperature sensor that allows an

2. An overtemperature indicator is implemented by carrying out a

3. The automatic power-down feature enables the AD7816,

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

IN2

IN3

IN1

IN4

accurate measurement of the ambient temperature to be

made. The measurable temperature range is –55°C to +125°C.

digital comparison of the ADC code for Channel 0 (tempera-

ture sensor) with the contents of the on-chip overtemperature

a predetermined temperature is exceeded.

AD7817, and AD7818 to achieve superior power perfor-

mance at slower throughput rates, e.g., 40 µW at 1 kSPS

throughput rate.

and QSPI™ protocols and National Semiconductors

SENSOR

TEMP

AD7817

MUX

AD7816/AD7817/AD7818

FUNCTIONAL BLOCK DIAGRAM

AGND

CAPACITOR

SAMPLING

REF

2.5V

BALANCE

DGND

REF

REDISTRIBUTION

BUSY

CHARGE

OVERTEMP

CONTROL

DAC

LOGIC

REG

CONVST

CONTROL

CLOCK

A > B

DATA

www.analog.com

OUT

REG

OTI

SCLK

RD/WR

OUT

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