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BUY AD693AQ https://www.utsource.net/itm/p/261177.html
Loop-Powered 4.20 mA Sensor Transmitter

Below is the parameter table and instructions for the AD693AQ, a precision voltage-to-frequency converter from Analog Devices.

AD693AQ Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit
Supply Voltage	VCC	4.5	5.0	5.5	V
Output Frequency Range	fOUT	0	-	200	kHz
Full-Scale Input Voltage	VIN(FS)	0	-	10	V
Linearity		-	±0.01	-	% FS
Temperature Coefficient		-	±5	-	ppm/°C
Power Consumption		-	15	-	mA
Operating Temperature Range	Toperating	-40	-	+85	°C
Storage Temperature Range	Tstorage	-65	-	+150	°C
Output Pulse Width	tPW	1	-	2	μs
Rise/Fall Time	tr/f	50	-	100	ns

Instructions for Using the AD693AQ

1. Power Supply:

   • Connect the VCC pin to a stable 5V power supply.
   • Ensure the ground (GND) pin is properly connected to the system ground.

2. Input Voltage:

   • Apply the input voltage (VIN) to the VIN pin. The input voltage range is 0 to 10V.
   • Use a low-impedance source to drive the VIN pin to avoid loading effects.

3. Output Configuration:

   • The output frequency (fOUT) is proportional to the input voltage (VIN).
   • The output pulse width (tPW) is typically 1 to 2 microseconds.
   • The rise and fall times (tr/f) are approximately 50 to 100 nanoseconds.

4. Calibration:

   • For precise applications, calibrate the AD693AQ using known input voltages and measuring the corresponding output frequencies.
   • Adjust the external components (if any) to achieve the desired linearity and accuracy.

5. Temperature Compensation:

   • The temperature coefficient is ±5 ppm/°C. For applications requiring high stability over temperature, consider using temperature compensation techniques or placing the device in a temperature-controlled environment.

6. Decoupling Capacitors:

   • Place a 0.1 μF ceramic capacitor between VCC and GND as close to the device as possible to filter out noise and stabilize the power supply.

7. Output Load:

   • The output can drive a capacitive load up to 100 pF. For larger loads, use a buffer amplifier.

8. Handling and Storage:

   • Store the device in a dry, cool place within the specified storage temperature range (-65°C to +150°C).
   • Handle the device with care to avoid static discharge, which can damage the sensitive internal components.

By following these instructions, you can ensure optimal performance and reliability of the AD693AQ in your application.

(For reference only)