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Specifications
SKU: 833219
Low Cost Monolithic Voltage-to-Frequency Converter
Below is the parameter table and instructions for the AD654JRZ, which is a voltage-to-frequency converter from Analog Devices.
AD654JRZ Parameter Table
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions |
|---|---|---|---|---|---|---|
| Supply Voltage | Vcc | 4.5 | 18 | V | ||
| Operating Temperature Range | -40 | +85 | °C | |||
| Output Frequency Range | fOUT | 0.1 | 100 | kHz | VREF = 2.5V to 15V, RSET = 1kΩ to 10kΩ | |
| Input Voltage Range | VIN | 0 | Vcc-1.5 | V | ||
| Linearity | ±0.015% | of FSR | Vcc = 5V, VREF = 5V, RSET = 1kΩ | |||
| Temperature Coefficient | 50 | ppm/°C | Vcc = 5V, VREF = 5V, RSET = 1kΩ | |||
| Power Consumption | 15 | mA | Vcc = 5V | |||
| Output Pulse Width | tPW | 0.3 | 0.5 | 0.7 | μs | Vcc = 5V, VREF = 5V, RSET = 1kΩ |
| Rise Time | tr | 0.1 | 0.2 | 0.3 | μs | Vcc = 5V, VREF = 5V, RSET = 1kΩ |
| Fall Time | tf | 0.1 | 0.2 | 0.3 | μs | Vcc = 5V, VREF = 5V, RSET = 1kΩ |
| Input Impedance | ZIN | 100 | MΩ | Vcc = 5V, VREF = 5V, RSET = 1kΩ | ||
| Output Impedance | ZOUT | 50 | Ω | Vcc = 5V, VREF = 5V, RSET = 1kΩ |
Instructions for Using AD654JRZ
Power Supply Connection:
- Connect the positive supply voltage (Vcc) to pin 8.
- Connect the ground (GND) to pin 4.
Reference Voltage (VREF):
- Connect the reference voltage to pin 7. This can be the same as Vcc or an external reference voltage.
Input Voltage (VIN):
- Connect the input voltage to pin 5. Ensure that VIN is within the range of 0V to Vcc - 1.5V.
Output (fOUT):
- The output frequency is available at pin 6. It is a square wave with a pulse width of approximately 0.5 μs.
Set Resistor (RSET):
- Connect a resistor between pin 1 and pin 4 (GND). The value of RSET determines the output frequency range. A typical value is 1kΩ to 10kΩ.
Capacitor (C1):
- Connect a capacitor between pin 2 and pin 4 (GND). This capacitor is used to set the frequency scaling factor. A typical value is 100 pF.
Frequency Calculation:
- The output frequency (fOUT) can be calculated using the formula: [ f_ = frac times frac{R_ times C_1} ]
- Where:
- ( V_ ) is the input voltage.
- ( V_ ) is the reference voltage.
- ( R_ ) is the set resistor value.
- ( C_1 ) is the capacitor value.
Temperature Compensation:
- For applications requiring high precision over temperature, consider using temperature-compensated resistors and capacitors.
Layout Considerations:
- Keep the layout compact to minimize noise and parasitic effects.
- Use bypass capacitors (e.g., 0.1 μF) close to the power supply pins to filter out noise.
Testing:
- Apply a known input voltage and measure the output frequency to verify the operation of the AD654JRZ.
- Use an oscilloscope to observe the output waveform and ensure it meets the expected specifications.
By following these instructions, you can effectively use the AD654JRZ in your voltage-to-frequency conversion applications.
(For reference only)Inquiry - AD654JRZ
