Overview
The AD654JRZ-REEL, manufactured 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, making it versatile for various applications such as A/D conversion, isolated signal transmission, F/V conversion, phase-locked loops, and tuning switched-capacitor filters.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Frequency Range | 0 | - | 500 kHz | - |
| Nonlinearity (fMAX = 250 kHz) | 0.06% | 0.1% | - | - |
| Input Voltage Range | -30 V | - | +30 V | - |
| Supply Voltage | 4.5 V | - | 36 V | - |
| Quiescent Current | - | 2.0 mA | - | - |
| Input Resistance | - | 250 MΩ | - | - |
| Temperature Coefficient | - | ±50 ppm/°C | - | - |
| Operating Temperature Range | -55°C | - | +125°C | - |
Key Features
- High Accuracy and Linearity: The AD654JRZ-REEL offers a nonlinearity error of only 0.03% for a 250 kHz full-scale frequency and operates over an 80 dB dynamic range.
- Flexible Input and Output: It can handle input voltages ranging from 100 mV to ±30 V and can drive up to 12 TTL loads, optocouplers, or long cables.
- Low Power Consumption: The device operates with a quiescent current of only 2.0 mA and can be powered from a single supply of 4.5 V to 36 V.
- High Input Resistance: The input amplifier has a high input resistance of 250 MΩ, allowing direct connection to small signal sources like 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, facilitating easy interface with various logic families.
Applications
- A/D Conversion: The AD654JRZ-REEL 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 function as a frequency-to-voltage converter, making it useful in various control and measurement systems.
- Phase-Locked Loops and Tuning Switched-Capacitor Filters: Its precision and stability make it ideal for these applications.
- Control Systems, Monitoring, and Test Equipment: The AD654JRZ-REEL is well-suited for use in control systems, monitoring equipment, and test instruments due to its high accuracy and reliability.
Q & A
- What is the primary function of the AD654JRZ-REEL?
The AD654JRZ-REEL is a voltage-to-frequency (V/F) converter that converts analog voltage signals into corresponding frequency signals.
- What is the frequency range of the AD654JRZ-REEL?
The frequency range of the AD654JRZ-REEL is from 0 Hz to 500 kHz.
- What is the input voltage range of the AD654JRZ-REEL?
The input voltage range can be set from 100 mV to ±30 V depending on the external RC network.
- What is the supply voltage range for the AD654JRZ-REEL?
The device operates from a single supply of 4.5 V to 36 V.
- How much quiescent current does the AD654JRZ-REEL consume?
The AD654JRZ-REEL consumes a quiescent current of 2.0 mA.
- What is the input resistance of the AD654JRZ-REEL?
The input resistance is 250 MΩ.
- Can the AD654JRZ-REEL drive multiple TTL loads?
Yes, it can drive up to 12 TTL loads, optocouplers, or long cables.
- What is the operating temperature range of the AD654JRZ-REEL?
The operating temperature range is from -55°C to +125°C.
- What are some common applications of the AD654JRZ-REEL?
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 for the AD654JRZ-REEL?
The full-scale frequency is set using a simple RC network according to the relationship f = V/10 RC.
