Datasheet > EVAL-AD7291SDZ

EVAL-AD7291SDZ

更新时间： 2024-12-01 10:16:47

品牌	Logo	应用领域
亚德诺 - ADI		传感器温度传感器
页数	文件大小	规格书
28页	483K
描述
8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor

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EVAL-AD7291SDZ 数据手册

8-Channel, I²C, 12-Bit SAR ADC

with Temperature Sensor

AD7291

FUNCTIONAL BLOCK DIAGRAM

FEATURES

GND

12-bit SAR ADC

8 single-ended analog input channels

Analog input range: 0 V to 2.5 V

12-bit temperature-to-digital converter

Temperature sensor accuracy of 1ꢀC typical

Channel sequencer operation

Specified for V_DDof 2.8 V to 3.6 V

Logic voltage V_DRIVE= 1.65 V to 3.6 V

Internal 2.5 V reference

REF

BUF

12-BIT

IN0

IN7

SUCCESSIVE

APPROXIMATION

ADC

T/H

INPUT

MUX

AD7291

I²C-compatible serial interface supports standard and

fast speed modes

SEQUENCER

SCL

SDA

AS1

CONTROL LOGIC

Out of range indicator/alert function

Autocycle mode

Power-down current: 12 μA maximum

Temperature range: −40ꢀC to +125ꢀC

20-lead LFCSP package

I C INTERFACE

TEMP

SENSOR

AS0

DRIVE

ALERT

PD/RST

Figure 1.

On-chip limit registers can be programmed with high and low

limits for the conversion results; an out-of-range indicator

output (ALERT) becomes active when the programmed high

or low limits are violated by the conversion result. This output

can be used as an interrupt.

GENERAL DESCRIPTION

The AD7291 is a 12-bit, low power, 8-channel, successive

approximation analog-to-digital converter (ADC) with an

internal temperature sensor.

The part operates from a single 3.3 V power supply and features

an I²C-compatible interface. The part contains a 9-channel

multiplexer and a track-and-hold amplifier than can handle

frequencies up to 30 MHz. The device has an on-chip 2.5 V

reference that can be disabled to allow the use of an external

reference.

PRODUCT HIGHLIGHTS

1. Ideally suited to monitoring system variables in a variety

of systems including telecommunications, process control,

and industrial control.

2. I²C-compatible serial interface, which supports standard

and fast modes.

The AD7291 provides a 2-wire serial interface compatible with

I²C interfaces. The I²C interface supports standard and fast I²C

interface modes. The AD7291 normally remains in a partial

power-down state while not converting and powers up for

conversions. The conversion process can be controlled by a

command mode where conversions occur across I²C write

operations or an autocycle mode selected through software

control.

3. Automatic partial power-down while not converting to

maximize power efficiency.

4. Channel sequencer operation.

5. Integrated temperature sensor with 0.25°C resolution.

6. Out of range indicator that can be software disabled or

enabled.

Table 1. AD7291 and Related Products

Device

Resolution Interface Features

The AD7291 includes a high accuracy band gap temperature

sensor, which is monitored and digitized by the 12-bit ADC to

give a resolution of 0.25°C.

12-bit

I²C

8-channel, I²C, 12-bit SAR

AD7291

ADC with temperature sensor

AD7298 12-bit

SPI

8-channel, 1 MSPS, 12-bit SAR

ADC with temperature sensor

The AD7291 offers a programmable sequencer, which enables

the selection of a preprogrammable sequence of channels for

conversion.

Rev. 0

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. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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