Details

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BUY AD7888ARZ https://www.utsource.net/itm/p/12444416.html

Parameter	Symbol	Min	Typical	Max	Unit	Description
Supply Voltage	VDD	2.7	-	5.25	V	Operating supply voltage range
Analog Input Range	VIN	0	-	VDD	V	Input voltage range
Resolution		-	12	-	bits	ADC resolution
Conversion Time	tCONV	-	16.4	-	μs	Conversion time at 2.7V supply
Sampling Rate	fSAMP	-	61	-	kSPS	Maximum sampling rate
Power Consumption	IDD	-	0.4	-	mA	Active current consumption
Power Consumption (Sleep)	IDD(Sleep)	-	0.1	-	μA	Sleep mode current consumption
Differential Nonlinearity	DNL	-1	0	+1	LSB	Differential nonlinearity
Integral Nonlinearity	INL	-1	0	+1	LSB	Integral nonlinearity
Signal-to-Noise Ratio	SNR	-	73	-	dB	Signal-to-noise ratio
Temperature Range	Toperating	-40	-	125	°C	Operating temperature range
Package Type		-	24-lead	-	LFCSP	Low-profile quad flat package

Instructions for Using AD7888ARZ

1. Power Supply:

   • Connect the VDD pin to a power supply within the range of 2.7V to 5.25V.
   • Ensure the ground (GND) is properly connected.

2. Analog Input:

   • Apply the analog signal to be converted to the AIN0 to AIN7 pins.
   • The input voltage should be within the range of 0V to VDD.

3. Digital Interface:

   • Use the SPI interface to communicate with the AD7888ARZ.
   • Connect the SCLK (Serial Clock), SDI (Serial Data In), and SDO (Serial Data Out) pins to your microcontroller or digital system.
   • The CS (Chip Select) pin must be pulled low to select the device for communication.

4. Conversion Start:

   • To start a conversion, send a start conversion command via the SPI interface.
   • The typical command sequence involves sending a specific byte to initiate the conversion process.

5. Reading Conversion Results:

   • After the conversion is complete (typically 16.4 μs at 2.7V supply), read the 12-bit result from the SDO pin.
   • The result will be in binary format and can be interpreted as a digital representation of the analog input.

6. Sleep Mode:

   • To enter sleep mode, send a sleep command via the SPI interface.
   • This reduces power consumption to approximately 0.1 μA.
   • To wake up the device, send a wake-up command or any valid command to the device.

7. Temperature Considerations:

   • Ensure the operating environment is within the specified temperature range of -40°C to 125°C.
   • Temperature variations may affect the performance parameters; refer to the datasheet for detailed thermal characteristics.

8. Decoupling Capacitors:

   • Place a 0.1 μF decoupling capacitor close to the VDD and GND pins to filter out noise and ensure stable operation.

9. Layout Recommendations:

   • Follow good PCB layout practices, such as keeping analog and digital grounds separate and using a ground plane to minimize noise.

10. Calibration:

    • For best accuracy, perform a system calibration to account for any offset or gain errors.
    • Refer to the datasheet for specific calibration procedures and equations.

(For reference only)