Overview
The AD654JR-REEL7, produced by Analog Devices Inc., is a high-performance, low-cost monolithic voltage-to-frequency (V/F) and frequency-to-voltage (F/V) converter. This device features excellent linearity, low drift, and stable operation over a wide range of operating conditions. It is designed to operate from a single power supply ranging from +5 V to +36 V and consumes a low quiescent current of 2.0 mA. Although the AD654JR-REEL7 is now obsolete, it remains a significant component in various legacy systems and applications.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Frequency Range | 0 | - | 500 kHz | - |
| Nonlinearity (fMAX = 250 kHz) | 0.06% | 0.1% | - | - |
| Nonlinearity (fMAX = 500 kHz) | 0.20% | 0.4% | - | - |
| Full-Scale Calibration Error | -10% | - | 10% | - |
| Temperature Coefficient | - | ±50 ppm/°C | - | - |
| Voltage Input Range (Single Supply) | 0 | - | (+VS – 4) V | - |
| Quiescent Current (VS = 5 V) | 1.5 mA | 2.0 mA | 2.5 mA | - |
| Operating Temperature Range | -40°C | - | +85°C | - |
| Output Sink Current (Logic “0”) | 10 mA | - | 20 mA | - |
Key Features
- Voltage-to-Frequency and Frequency-to-Voltage Conversion: The AD654JR-REEL7 can convert both voltage to frequency and frequency to voltage with high accuracy and linearity.
- High Linearity and Low Drift: It features a linearity error of only 0.03% for a 250 kHz full-scale frequency and a temperature coefficient of ±50 ppm/°C, making it suitable for high-precision applications.
- Wide Operating Voltage Range: The device operates from a single supply of +5 V to +36 V, making it versatile for various applications.
- Low Power Consumption: It consumes a low quiescent current of 2.0 mA, which is beneficial for power-sensitive designs.
- High Input Impedance and Low Offset: The input amplifier has a high input impedance of 250 MΩ and a low offset of 1 mV, allowing it to operate directly from small signals such as thermocouples or strain gauges.
- Square-Wave Output: Unlike most V/F converters, the AD654JR-REEL7 provides a square-wave output, which can drive up to 12 TTL loads, optocouplers, or long cables.
Applications
- Industrial Process Control: The AD654JR-REEL7 is suitable for industrial process control systems due to its high precision and stability.
- Instrumentation and Measurement Systems: It is used in various instrumentation and measurement systems where accurate voltage-to-frequency conversion is required.
- Data Acquisition Systems: The device is integrated into data acquisition systems to convert analog signals into digital frequencies.
- Analog-to-Digital Conversion: It plays a crucial role in analog-to-digital conversion processes, ensuring high accuracy and reliability.
Q & A
- What is the maximum frequency range of the AD654JR-REEL7?
The maximum frequency range of the AD654JR-REEL7 is up to 500 kHz.
- What is the typical quiescent current of the AD654JR-REEL7?
The typical quiescent current is 2.0 mA.
- What is the operating temperature range of the AD654JR-REEL7?
The operating temperature range is from -40°C to +85°C.
- Can the AD654JR-REEL7 drive TTL loads directly?
Yes, the AD654JR-REEL7 can drive up to 12 TTL loads directly.
- What is the input impedance of the AD654JR-REEL7's input amplifier?
The input impedance is 250 MΩ.
- Is the AD654JR-REEL7 still in active production?
No, the AD654JR-REEL7 is an obsolete product and is no longer in active production.
- What type of output does the AD654JR-REEL7 provide?
The AD654JR-REEL7 provides a square-wave output.
- What is the typical linearity error of the AD654JR-REEL7 for a 250 kHz full-scale frequency?
The typical linearity error is 0.03% for a 250 kHz full-scale frequency.
- Can the AD654JR-REEL7 operate with negative input voltages?
Yes, the AD654JR-REEL7 can operate with negative input voltages for below ground operation.
- What is the maximum output sink current of the AD654JR-REEL7 in logic “0” state?
The maximum output sink current is 20 mA in the logic “0” state.
