AD7740YRMZ

FEATURES

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

Low Power: 3 mW (Typ)

Nominal Input Range: 0 to VREF

True –150 mV Capability Without Charge Pump

VREF Range: 2.5 V to VDD

Internal 2.5 V Reference

1 MHz Max Input Frequency

Selectable High Impedance Buffered Input

Minimal External Components Required

APPLICATIONS

Isolation of High Common-Mode Voltages

Low-Cost Analog-to-Digital Conversion

Battery Monitoring

Automotive Sensing

GENERAL DESCRIPTION

The AD7740 is a low-cost, ultrasmall synchronous Voltage-toFrequency 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.

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.

For an analog input signal that goes from 0 V to VREF, the output frequency goes from 10% to 90% of fCLKIN. 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.

The AD7740 (Y Grade) is guaranteed over the automotive

temperature range of –40°C to +105°C

PRODUCT HIGHLIGHTS

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.

3. The AD7740 does not require external resistors and capacitors to set the output frequency. The maximum output

frequency is set by a crystal or a clock. No trimming or calibration is required.

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

true bipolar operation.

5. The specified voltage reference range on REFIN is from

2.5 V to the supply voltage, VDD.

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