ADT7518_15 datasheet(1/40 Pages) AD

部件名	ADT7518

功能描述	SPI/IC Compatible, Temperature Sensor, 4-Channel ADC and Quad Voltage Output DAC

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制造商	AD [Analog Devices]

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SPI/I2C Compatible, Temperature Sensor,

4-Channel ADC and Quad Voltage Output DAC

ADT7518

Rev. A

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

registered trademarks are the property of their respective owners.

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

Tel: 781.329.4700

www.analog.com

Fax: 781.326.8703

FEATURES

Four 8-bit DACs

Buffered voltage output

Guaranteed monotonic by design over all codes

10-bit temperature-to-digital converter

10-bit 4-channel ADC

DC input bandwidth

Input range: 0 V to 2.25 V

Temperature range: –40°C to +120°C

Temperature sensor accuracy of typ: ±0.5°C

Supply range: 2.7 V to 5.5 V

DAC output range: 0 V to 2 VREF

Power-down current: 1 µA

Internal 2.25 VREF option

Double-buffered input logic

Buffered reference input

Power-on reset to 0 V DAC output

Simultaneous update of outputs (LDAC function)

On-chip rail-to-rail output buffer amplifier

SPI

®, I2C®, QSPI™, MICROWIRE™, and DSP-compatible

4-wire serial interface

SMBus packet error checking (PEC)-compatible

16-lead QSOP package

APPLICATIONS

Portable battery-powered instruments

Personal computers

Smart battery chargers

Telecommunications systems

Electronic text equipment

Domestic appliances

Process control

PIN CONFIGURATION

ADT7518

TOP VIEW

(Not to Scale)

VOUT-B 1

VOUT-C

16

VOUT-A 2

VOUT-D

15

VREF-IN 3

AIN4

14

CS

4

SCL/SCLK

13

GND

5

SDA/DIN

12

VDD 6

DOUT/ADD

11

D+/AIN1

7

INT/INT

10

D–/AIN2

8

LDAC/AIN3

9

Figure 1.

GENERAL DESCRIPTION

The ADT7518 combines a 10-bit temperature-to-digital

converter, a 10-bit 4-channel ADC, and a quad 8-bit DAC, in a

16-lead QSOP package. The part also includes a band gap

temperature sensor and a 10-bit ADC to monitor and digitize

the temperature reading to a resolution of 0.25°C.

The ADT7518 operates from a single 2.7 V to 5.5 V supply. The

input voltage range on the ADC channels is 0 V to 2.25 V, and

the input bandwidth is dc. The reference for the ADC channels

is derived internally. The output voltage of the DAC ranges

from 0 V to VDD, with an output voltage settling time of 7 ms

typical.

The ADT7518 provides two serial interface options: a 4-wire

serial interface that is compatible with SPI, QSPI, MICROWIRE,

and DSP interface standards, and a 2-wire SMBus/I2C interface.

It features a standby mode that is controlled through the serial

interface.

The reference for the four DACs is derived either internally or

from a reference pin. The outputs of all DACs may be updated

simultaneously using the software LDAC function or the exter-

nal LDAC pin. The ADT7518 incorporates a power-on reset

circuit, which ensures that the DAC output powers up to 0 V

and remains there until a valid write takes place.

The ADT7518’s wide supply voltage range, low supply current,

and SPI-/I2C-compatible interface make it ideal for a variety of

applications, including personal computers, office equipment,

and domestic appliances.

It is recommended that new designs use the ADT7519 rather

than the ADT7518. The ADT7518’s internal and external temp-

erature accuracy spec is only valid when not using the internal

reference for the on-chip DAC. The ADT7519 does not have

this limitation.

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