AD7740YRMZ

更新时间： 2024-11-09 12:53:47

品牌	Logo	应用领域
亚德诺 - ADI		转换器模拟特殊功能转换器光电二极管 PC
页数	文件大小	规格书
11页	146K
描述
3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter

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AD7740YRMZ 数据手册

3 V/5 V Low Power, Synchronous

Voltage-to-Frequency Converter

AD7740*

FEATURES

FUNCTIONAL BLOCK DIAGRAM

Synchronous Operation

Full-Scale Frequency Set by External System Clock

8-Lead SOT-23 and 8-Lead microSOIC Packages

3 V or 5 V Operation

REFIN/OUT

VDD

AD7740

2.5V

REFERENCE

Low Power: 3 mW (Typ)

Nominal Input Range: 0 to V_REF

True –150 mV Capability Without Charge Pump

V_REFRange: 2.5 V to VDD

Internal 2.5 V Reference

1 MHz Max Input Frequency

VOLTAGE-TO-

FREQUENCY

MODULATOR

VIN

FOUT

Selectable High Impedance Buffered Input

Minimal External Components Required

CLOCK

GENERATION

APPLICATIONS

Isolation of High Common-Mode Voltages

Low-Cost Analog-to-Digital Conversion

Battery Monitoring

BUF

CLKOUT

CLKIN

GND

Automotive Sensing

GENERAL DESCRIPTION

PRODUCT HIGHLIGHTS

The AD7740 is a low-cost, ultrasmall synchronous Voltage-to-

Frequency Converter (VFC). It works from a single 3.0 V to

3.6 V or 4.75 V to 5.25 V supply consuming 0.9 mA. The AD7740

is available in an 8-lead SOT-23 and also in an 8-lead microSOIC

package. Small package, low cost and ease of use were major

design goals for this product. The part contains an on-chip 2.5 V

bandgap reference but the user may overdrive this using an

external reference. This external reference range includes VDD.

1. The AD7740 is a single channel, single-ended VFC. It is

available in 8-lead SOT-23 and 8-lead microSOIC packages,

and is intended for low-cost applications. The AD7740 offers

considerable space saving over alternative solutions.

2. The AD7740 operates from a single 3.0 V to 3.6 V or 4.75 V

to 5.25 V supply and consumes typically 0.9 mA when the

input is unbuffered. It also contains an automatic power-down

function.

The full-scale output frequency is synchronous with the clock

signal on the CLKIN pin. This clock can be generated with the

addition of an external crystal (or resonator) or supplied from a

CMOS-compatible clock source. The part has a maximum

input frequency of 1 MHz.

3. The AD7740 does not require external resistors and capaci-

tors to set the output frequency. The maximum output

frequency is set by a crystal or a clock. No trimming or cali-

bration is required.

4. The analog input can be taken to 150 mV below GND for

true bipolar operation.

For an analog input signal that goes from 0 V to V_REF, the out-

put frequency goes from 10% to 90% of f_CLKIN.In buffered mode,

the part provides a very high input impedance and accepts a

range of 0.1 V to VDD – 0.2 V on the VIN pin. There is also

an unbuffered mode of operation that allows VIN to go from

–0.15 V to VDD + 0.15 V. The modes are interchangeable using

the BUF pin.

5. The speciﬁed voltage reference range on REFIN is from

2.5 V to the supply voltage, VDD.

The AD7740 (Y Grade) is guaranteed over the automotive

temperature range of –40°C to +105°C. The AD7740 (K Grade)

is guaranteed from 0°C to 85°C.

*Protected under U.S. Patent # 6,147,528.

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

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

otherwise under any patent or patent rights of Analog Devices.

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

Tel: 781/329-4700

Fax: 781/326-8703

World Wide Web Site: http://www.analog.com

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AD7740YRMZ 替代型号

型号	品牌	替代类型	描述	数据表
AD7740YRMZ-REEL7	ADI	完全替代	3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter
AD7740YRTZ-REEL7	ADI	完全替代	3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter
AD7740YRM	ADI	完全替代	3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter

与AD7740YRMZ相关器件

型号	品牌	获取价格	描述	数据表
AD7740YRMZ-REEL	ADI	获取价格	3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter
AD7740YRMZ-REEL7	ADI	获取价格	3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter
AD7740YRT	ADI	获取价格	3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter
AD7740YRTZ-REEL7	ADI	获取价格	3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter
AD7741	ADI	获取价格	Single and Multichannel, Synchronous Voltage-to-Frequency Converters
AD7741_15	ADI	获取价格	Single and Multichannel, Synchronous Voltage-to-Frequency Converters
AD7741BN	ROCHESTER	获取价格	VOLTAGE-FREQUENCY CONVERTER, 6.144MHz, PDIP8, PLASTIC, DIP-8
AD7741BN	ADI	获取价格	Single and Multichannel, Synchronous Voltage-to-Frequency Converters
AD7741BNZ	ADI	获取价格	Single and Multichannel, Synchronous Voltage-to-Frequency Converters
AD7741BNZ	ROCHESTER	获取价格	VOLTAGE-FREQUENCY CONVERTER, 6.144MHz, PDIP8, PLASTIC, DIP-8

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