Overview
The AD654JR-REEL, produced by Analog Devices Inc., is a low-cost monolithic voltage-to-frequency (V/F) converter. This integrated circuit combines an input amplifier, a precision oscillator system, and a high current output stage. It is designed to convert analog voltage signals into corresponding frequency signals with high accuracy and minimal external components. The AD654JR-REEL is packaged in an 8-lead SOIC and operates from a single supply voltage ranging from 5 V to 36 V, consuming only 2.0 mA of quiescent current.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Frequency Range | 0 | - | 500 kHz | kHz |
| Nonlinearity (fMAX = 250 kHz) | 0.06% | 0.1% | - | % |
| Nonlinearity (fMAX = 500 kHz) | 0.20% | 0.4% | - | % |
| Full-Scale Calibration Error | -10% | - | 10% | % |
| Supply Voltage Range | 5 V | - | 36 V | V |
| Quiescent Current | - | 2.0 mA | - | mA |
| Input Resistance | - | 250 MΩ | - | MΩ |
| Temperature Coefficient | - | ±50 ppm/°C | - | ppm/°C |
| Output Load Capability | - | Up to 12 TTL loads | - | - |
Key Features
- High Accuracy and Linearity: The AD654JR-REEL offers a nonlinearity error of only 0.03% for a 250 kHz full-scale frequency and operates over an 80 dB dynamic range.
- Low Power Consumption: It consumes only 2.0 mA of quiescent current from a single supply voltage ranging from 5 V to 36 V.
- High Input Impedance and Low Drift: The input amplifier has a high input resistance of 250 MΩ and a low drift of 4 µV/°C, allowing operation directly from small signals such as thermocouples or strain gauges.
- Versatile Output Stage: The open-collector output stage can sink more than 10 mA with a saturation voltage less than 0.4 V and can drive up to 12 TTL loads, optocouplers, or long cables.
- Simple External Component Requirements: Only a single RC network is required to set up any full-scale frequency up to 500 kHz and any full-scale input voltage up to ±30 V.
Applications
- A/D Conversion: The AD654JR-REEL can be used as part of an analog-to-digital conversion system when paired with a microcomputer.
- Isolated Signal Transmission: It is suitable for applications requiring isolated signal transmission due to its ability to convert voltage signals into frequency signals.
- F/V Conversion: In addition to V/F conversion, it can be used in frequency-to-voltage conversion applications.
- Phase-Locked Loops and Tuning Switched-Capacitor Filters: The AD654JR-REEL can be integrated into phase-locked loops and tuning switched-capacitor filters due to its precise frequency output.
Q & A
- What is the frequency range of the AD654JR-REEL?
The AD654JR-REEL can operate within a frequency range of 0 to 500 kHz.
- What is the nonlinearity error of the AD654JR-REEL at 250 kHz full-scale frequency?
The nonlinearity error is only 0.03% at 250 kHz full-scale frequency.
- What is the input resistance of the AD654JR-REEL?
The input resistance is 250 MΩ.
- How much quiescent current does the AD654JR-REEL consume?
The AD654JR-REEL consumes 2.0 mA of quiescent current.
- What is the temperature coefficient of the AD654JR-REEL?
The temperature coefficient is typically ±50 ppm/°C.
- Can the AD654JR-REEL drive TTL loads directly?
Yes, it can drive up to 12 TTL loads, optocouplers, or long cables.
- What type of output does the AD654JR-REEL provide?
The AD654JR-REEL provides a square-wave output.
- How is the full-scale frequency set for the AD654JR-REEL?
The full-scale frequency is set using a simple RC network with the relationship f = V/10 RC.
- What are some common applications of the AD654JR-REEL?
Common applications include A/D conversion, isolated signal transmission, F/V conversion, phase-locked loops, and tuning switched-capacitor filters.
- What is the operating supply voltage range for the AD654JR-REEL?
The operating supply voltage range is from 5 V to 36 V.
