Overview
The AD7740KRM, produced by Analog Devices Inc., is a low-cost, ultrasmall synchronous Voltage-to-Frequency Converter (VFC). This device operates from a single supply voltage of 3.0 V to 3.6 V or 4.75 V to 5.25 V, making it versatile for various applications. The AD7740KRM is designed to be compact and energy-efficient, consuming a nominal 0.9 mA of current and 3 mW of power. It is available in 8-lead SOT-23 and 8-lead MSOP packages, enhancing its suitability for space-constrained designs.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V or 4.75 V to 5.25 V |
| Current Consumption | 0.9 mA (typical) |
| Power Consumption | 3 mW (typical) |
| Input Voltage Range | 0 to VREF (buffered mode: 0.1 V to VDD - 0.2 V, unbuffered mode: -0.15 V to VDD + 0.15 V) |
| Maximum Input Frequency | 1 MHz |
| Output Frequency Range | 10% to 90% of fCLKIN |
| Reference Voltage | Internal 2.5 V bandgap reference (overdrivable by external reference) |
| Package Types | 8-lead SOT-23, 8-lead MSOP |
| Linearity | ±0.012% |
| Temperature Drift | ±50 ppm/°C |
Key Features
- Synchronous operation with external system clock
- Full-scale frequency set by external system clock
- Internal 2.5 V bandgap reference (overdrivable by external reference)
- High input impedance in buffered mode
- Minimal external components required
- Low power consumption: 3 mW (typical)
- Compact packaging: 8-lead SOT-23 and 8-lead MSOP
Applications
- Isolation of high common-mode voltages
- Low-cost analog-to-digital conversion
- Battery monitoring
- Automotive sensing
- Isolated analog signal transmission
Q & A
- What is the supply voltage range for the AD7740KRM?
The AD7740KRM operates from a single supply voltage of 3.0 V to 3.6 V or 4.75 V to 5.25 V. - What is the typical current consumption of the AD7740KRM?
The typical current consumption is 0.9 mA. - What is the maximum input frequency for the AD7740KRM?
The maximum input frequency is 1 MHz. - What are the package options for the AD7740KRM?
The device is available in 8-lead SOT-23 and 8-lead MSOP packages. - Does the AD7740KRM have an internal reference voltage?
Yes, it has an internal 2.5 V bandgap reference that can be overdriven by an external reference. - What are the input voltage ranges for the AD7740KRM in buffered and unbuffered modes?
In buffered mode, the input voltage range is 0.1 V to VDD - 0.2 V. In unbuffered mode, it is -0.15 V to VDD + 0.15 V. - What is the linearity of the AD7740KRM?
The linearity is ±0.012%. - What is the temperature drift of the AD7740KRM?
The temperature drift is ±50 ppm/°C. - Can the AD7740KRM be used for isolated analog signal transmission?
Yes, it can be used for isolated analog signal transmission applications. - What are some common applications of the AD7740KRM?
Common applications include isolation of high common-mode voltages, low-cost analog-to-digital conversion, battery monitoring, and automotive sensing.
