AD7740KRMZ Analog Devices Inc, AD7740KRMZ Datasheet

AD7740KRMZ

Manufacturer Part Number

AD7740KRMZ

Description

IC CONV SYNC VOLT-FREQ 8-MSOP

Manufacturer

Analog Devices Inc

Type

Voltage to Frequencyr

Datasheet

1.AD7740YRMZ.pdf (11 pages)

Specifications of AD7740KRMZ

Frequency - Max

500kHz

Full Scale

±50ppm/°C

Linearity

±0.012%

Mounting Type

Surface Mount

Package / Case

8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Frequency

1MHz

Full Scale Range

500kHz

Linearity %

Supply Voltage Range

3V To 5.25V

Digital Ic Case Style

SOIC

No. Of Pins

Msl

MSL 3 - 168 Hours

Frequency Max

1MHz

Converter Function

VFC

Full Scale Frequency

1000

Power Supply Requirement

Single

Single Supply Voltage (max)

5.25V

Single Supply Voltage (min)

Dual Supply Voltage (typ)

Not RequiredV

Dual Supply Voltage (min)

Not RequiredV

Dual Supply Voltage (max)

Not RequiredV

Operating Temperature (min)

Operating Temperature (max)

85C

Operating Temperature Classification

Commercial

Package Type

MSOP

Converter Type

Voltage/Frequency

Rohs Compliant

Yes

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Lead Free Status / RoHS Status

Lead free / RoHS Compliant, Lead free / RoHS Compliant

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GENERAL DESCRIPTION

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.

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 V

put frequency goes from 10% to 90% of f

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. The AD7740 (K Grade)

is guaranteed from 0°C to 85°C.

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

CLKIN.

In buffered mode,

REF

, the out-

Voltage-to-Frequency Converter

3 V/5 V Low Power, Synchronous

PRODUCT HIGHLIGHTS

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

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

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

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

5. The speciﬁed voltage reference range on REFIN is from

VIN

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.

to 5.25 V supply and consumes typically 0.9 mA when the

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

function.

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.

true bipolar operation.

2.5 V to the supply voltage, VDD.

AD7740

FUNCTIONAL BLOCK DIAGRAM

BUF

GND

REFIN/OUT

VOLTAGE-TO-

MODULATOR

FREQUENCY

CLKOUT

GENERATION

REFERENCE

CLOCK

2.5V

AD7740

CLKIN

VDD

FOUT

Related parts for AD7740KRMZ

AD7740KRMZ Summary of contents

Page 1

GENERAL DESCRIPTION The AD7740 is a low-cost, ultrasmall synchronous Voltage-to- Frequency Converter (VFC). It works from a single 5.25 V supply consuming 0.9 mA. The AD7740 is available in an ...

AD7740 SPECIFICATIONS 2 Parameter DC PERFORMANCE Integral Nonlinearity 3 CLKIN = 32 kHz CLKIN = 1 MHz 3 CLKIN = 32 kHz CLKIN = 1 MHz Offset Error Gain Error 3 Offset Error Drift 3 Gain Error Drift 3 Power ...

Page 3

TIMING CHARACTERISTICS Limit MIN MAX Parameter VDD = 3 3 CLKIN 40:60 HIGH LOW 60: 2 1.6 3 ± ...

Page 4

AD7740 8-Lead microSOIC CLKOUT CLKIN GND REFIN/OUT 8-LEAD microSOIC PIN NUMBERS Pin No. Mnemonic Function 1 CLKOUT The crystal/resonator is tied between this pin and CLKIN. In the case of an external clock driving CLKIN, an inverted clock signal appears ...

Page 5

TERMINOLOGY INTEGRAL NONLINEARITY For the VFC, Integral Nonlinearity (INL measure of the maxi- mum deviation from a straight line passing through the actual endpoints of the VFC transfer function. The error is expressed the actual ...

Page 6

AD7740–Typical Performance Characteristics 0.015 VDD = 5V REFIN = 2.5V 0.01 CLKIN = 1MHz 0.005 BUFFER OFF 0 –0.005 BUFFER ON –0.01 –0.015 –0.5 0 0.5 1 1.5 2 2.5 VIN – REFIN ...

Page 7

GENERAL DESCRIPTION The AD7740 is a CMOS synchronous Voltage-to-Frequency Converter (VFC) which uses a charge-balance conversion technique. The input voltage signal is applied to a proprietary front-end based around an analog modulator which converts the input voltage into an output ...

Page 8

AD7740 Clock Generation As distinct from the asynchronous VFCs that rely on the stability of an external capacitor to set their full-scale frequency, the AD7740 uses an external clock to deﬁne the full-scale output frequency. The result is a more ...

Page 9

A/D Conversion Techniques Using the AD7740 One method of using a VFC in an A/D system is to count the output pulses of FOUT for a ﬁxed gate interval (see Figure 9). This ﬁxed gate interval should be generated by ...

Page 10

AD7740 Temperature Sensor Application The AD7740 can be used with an AD22100S temperature sensor to give a digital measure of ambient temperature. The output voltage of the AD22100S is proportional to the tempera- ture times the supply voltage. It uses ...

Page 11

OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead microSOIC (RM-8) 0.122 (3.10) 0.114 (2.90 0.122 (3.10) 0.199 (5.05) 0.114 (2.90) 0.187 (4.75 PIN 1 0.0256 (0.65) BSC 0.120 (3.05) 0.112 (2.84) 0.043 (1.09) 0.006 (0.15) ...

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