Datasheet for AD7740:
- Manufacturer Part Number : AD7740
- Manufacturer : AD
- Description : 3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter
- Series : AD7740
- Reference Price : USD 0.752
- Our Price : We have a better price, contact us by email
- Product Type : Integrated/Special Purpose A/D Converters
- Function : Voltage to Frequency Converters
- Current Suggest : Production
- Status : Production
- RoHS Status: -
- Voltage: -
- Feature: -
- Package Case: -
- Temperature Range: -
- Packing: Reel/Tray/Tube
- Standard Packing Quantity: -
- Country of Origin: -
- Other Part Number : AD7740
- Shipping methods : DHL FEDEX UPS TNT
- Delivery Time : Ship within 1 day.
- Manufacturer Production time : 6-8 weeks (Normally have stocks)
- Weight : 0.001KG
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The AD7740 is a low-cost, ultrasmall synchronous Voltage-to-FrequencyConverter (VFC). It works from a single 3.0 V to3.6 V or 4.75 V to 5.25 V supply consuming 0.9 mA. The AD7740is available in an 8-lead SOT-23 and also in an 8-lead MSOPpackage. Small package, low cost and ease of use were majordesign goals for this product. The part contains an on-chip 2.5 Vbandgap reference but the user may overdrive this using anexternal reference. This external reference range includes VDD.
The full-scale output frequency is synchronous with the clocksignal on the CLKIN pin. This clock can be generated with theaddition of an external crystal (or resonator) or supplied from aCMOS-compatible clock source. The part has a maximuminput frequency of 1 MHz.
For an analog input signal that goes from 0 V to VREF, the outputfrequency goes from 10% to 90% of fCLKIN. In buffered mode,the part provides a very high input impedance and accepts arange of 0.1 V to VDD – 0.2 V on the VIN pin. There is alsoan unbuffered mode of operation that allows VIN to go from–0.15 V to VDD + 0.15 V. The modes are interchangeable usingthe BUF pin.
The AD7740 (Y Grade) is guaranteed over the automotivetemperature range of –40°C to +105°C. The AD7740 (K Grade)is guaranteed from 0°C to 85°C.
Product Highlights
- The AD7740 is a single channel, single-ended VFC. It is available in 8-lead SOT-23 and 8-lead MSOP packages, and is intended for low-cost applications. The AD7740 offers considerable space saving over alternative solutions.
- 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 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.
- The analog input can be taken to 150 mV below GND for true bipolar operation.
- The specified voltage reference range on REFIN is from 2.5 V to the supply voltage, VDD.
Applications
- Isolation of high common-mode voltages
- Low-cost analog-to-digital conversion
- Battery monitoring
- Automotive sensing
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
