AD7740: 3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter
The AD7740 is the world's smallest, lowest-cost, 12-Bit accurate VFC.
Since this is a synchronous converter, the output frequency is related to the fixed master clock frequency so ...More
AD7740: 3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter
Product Description
The AD7740 is the world's smallest, lowest-cost, 12-Bit accurate VFC.
Since this is a synchronous converter, the output frequency is related to the fixed master clock frequency so temperature stability is much improved over asynchronous VFCs. With a 1 MHz input clock frequency, the FS output frequency is 900 kHz. The voltage reference input can be tied to the supply, if required.
Historically the primary applications for VFCs have been either to implement low cost A/D conversion or to achieve simple isolation.
The AD7740 is being offered in an 8-pin MicroSOIC package plus an 8-lead SOT-23 package. The SOT-packaged devices are only available on T&R. Two operating temperature ranges are available; from 0°C to +85°C and from -40°C to +105°C.
Features
- Synchronous Operation
- Full-Scale Frequency Set by External System Clock
- 8-Lead SOT-23 and 8-Lead microSOIC Package
- 3 V and 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
Diagrams
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- Symbols and Footprints
Functional Block Diagram for AD7740
3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter
Functional Block Diagram for AD7740
| Part# | Architecture | # Channels | Input Voltage Range (V) | Full Scale Fout (kHz) | Reference Voltage (V) | Accuracy (%/kHz) | Input Clk Frequency (MHz) | Voltage Supply (V) | Supply Current (max) | Package | Price* (1000-4999) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AD537 | Non-Synchronous | 1-Single Ended | ±11 | 150 | 1 | 0.25 | - | +/- 5 to +/- 18 | 2.5 | 14-Lead CerDIP | $9.65 |
| AD650 | Non-Synchronous | 1-Single Ended | +11 | 1000 | - | 0.1 | - | +/- 9 to +/- 18 | 8 | 14-Lead CerDIP, 14-Lead PDIP, 20-Lead PLCC | $8.02 |
| AD652 | Synchronous | 1-Single Ended | ±10 | 2500 | 5 | 2 | 5 | +/- 6 to +/- 15 | 15 | 20-Lead PLCC | $9.92 |
| AD654 | Non-Synchronous | 1-Single Ended | ±14 | 500 | - | 0.4 | - | +/- 5 to +/- 18 | 2.5 | 8-Lead PDIP, 8-Lead SOIC | $3.76 |
| AD7740 | Synchronous | 1-Single Ended | +2.5 | 500 | 2.5 | 1 | 1 | 3 to 5.25 | 1.5 | 8-Lead MSOP, 8-Lead SOT-23 | $0.91 |
| AD7741 | Synchronous | 1-Single Ended | +2.5 | 3072 | 2.5 | 2 | 6.144 | 4.75 to 5.25 | 8 | 8-Lead PDIP, 8-Lead SOIC | $1.76 |
| AD7742 | Synchronous | 2-Differential, 3-Pseudo Differential | +3.5 | 3072 | 2.5 | 2 | 6.144 | 4.75 to 5.25 | 8 | 16-Lead PDIP, 16-Lead SOIC | - |
| ADVFC32 | Non-Synchronous | 1-Single Ended | +10 | 500 | - | 0.2 | - | +/- 9 to +/- 18 | 8 | 14-Lead PDIP | $6.14 |
* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S.
Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.