Overview
The AD654JRZ, produced by Analog Devices Inc., is a monolithic voltage-to-frequency (V/F) converter. This integrated circuit is designed to convert an analog input voltage into a corresponding frequency output. It features a high degree of linearity and precision, making it suitable for various applications requiring accurate analog-to-digital conversion. The AD654JRZ operates from a single supply voltage ranging from 5 V to 36 V and consumes a low quiescent current of 2.0 mA. It is packaged in both 8-lead mini-DIP and 8-lead SOIC configurations, enhancing its versatility in different design environments.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Frequency Range | 0 | - | 500 | kHz |
| Nonlinearity (fMAX = 250 kHz) | 0.06% | 0.1% | - | - |
| Input Voltage Range | -30 | - | +30 | V |
| Supply Voltage | 5 | - | 36 | V |
| Quiescent Current | - | 2.0 | - | mA |
| Input Resistance | - | 250 | - | MΩ |
| Temperature Coefficient | - | ±50 | - | ppm/°C |
Key Features
- High Linearity and Precision: The AD654JRZ offers a linearity error of only 0.03% for a 250 kHz full-scale frequency, ensuring accurate conversions.
- Wide Input Voltage Range: It can accommodate input voltages from 100 mV to ±30 V, making it versatile for various applications.
- Low Power Consumption: The device operates with a low quiescent current of 2.0 mA from a single supply voltage between 5 V and 36 V.
- High Input Resistance: The input amplifier has a high input resistance of 250 MΩ, suitable for direct connection to small signal sources like thermocouples or strain gauges.
- Versatile Output Stage: The open-collector output can drive up to 12 TTL loads, optocouplers, or long cables, and can be easily interfaced with various logic families.
Applications
- A/D Conversion: The AD654JRZ can be used as an analog-to-digital converter when paired with a microcomputer having an interval timer/event counter.
- Isolated Signal Transmission: It is suitable for transmitting signals over long distances or through isolation barriers.
- F/V Conversion: The device can also be used for frequency-to-voltage conversion in various applications.
- Phase-Locked Loops and Tuning Switched-Capacitor Filters: Its precision and linearity make it a good fit for these applications.
Q & A
- What is the primary function of the AD654JRZ? The AD654JRZ is a voltage-to-frequency (V/F) converter, converting an analog input voltage into a corresponding frequency output.
- What is the input voltage range of the AD654JRZ? The input voltage range can be set from 100 mV to ±30 V.
- What is the frequency range of the AD654JRZ? The frequency range is from 0 to 500 kHz.
- How much quiescent current does the AD654JRZ consume? The device consumes a quiescent current of 2.0 mA.
- What is the typical temperature coefficient of the AD654JRZ? The typical temperature coefficient is ±50 ppm/°C.
- What types of packages are available for the AD654JRZ? It is available in both 8-lead mini-DIP and 8-lead SOIC packages.
- Can the AD654JRZ drive TTL loads directly? Yes, the open-collector output can drive up to 12 TTL loads.
- What is the input resistance of the AD654JRZ? The input resistance is 250 MΩ.
- What are some common applications of the AD654JRZ? Common applications include A/D conversion, isolated signal transmission, F/V conversion, phase-locked loops, and tuning switched-capacitor filters.
- How is the full-scale frequency set in the AD654JRZ? The full-scale frequency is set using a simple RC network according to the relationship f = V/10 RC.
