Details

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Below is the parameter table and instructions for the AD7730BR, a 24-bit sigma-delta analog-to-digital converter (ADC) from Analog Devices.

AD7730BR Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit
Supply Voltage	VDD	2.7	5.25	5.5	V
Analog Input Range	VIN	-0.1		VDD + 0.1	V
Resolution			24		bits
Differential Nonlinearity (DNL)	DNL	-1	0	+1	LSB
Integral Nonlinearity (INL)	INL	-2	0	+2	LSB
Signal-to-Noise Ratio (SNR)	SNR		116		dB
Total Harmonic Distortion (THD)	THD		-110		dB
Conversion Rate	fCONV	0.2	10	100	Hz
Output Data Rate	fODR	0.2	10	100	Hz
Input Bias Current	IB		100		nA
Input Offset Voltage	VOS		10		μV
Power Consumption	IDD		1.5		mA
Operating Temperature	Toper	-40		85	°C
Storage Temperature	Tstg	-65		150	°C

Instructions for Using AD7730BR

1. Power Supply:

   • Connect the VDD pin to a stable power supply between 2.7V and 5.5V.
   • Ensure that the power supply has adequate decoupling capacitors (e.g., 0.1μF and 10μF) placed close to the VDD pin to reduce noise and stabilize the supply voltage.

2. Analog Input:

   • Connect the analog input signal to the appropriate input pins (AIN1, AIN2, etc.).
   • Ensure that the input signal is within the range of -0.1V to VDD + 0.1V to avoid damage to the ADC.

3. Digital Interface:

   • The AD7730BR supports SPI (Serial Peripheral Interface) communication.
   • Connect the SCLK (Serial Clock), SDATA (Serial Data), and CS (Chip Select) pins to the corresponding pins on your microcontroller or digital system.
   • Set the CS pin low to select the AD7730BR for communication.
   • Use the SCLK pin to clock data into and out of the AD7730BR.
   • The SDATA pin is used to read the conversion results and write configuration commands.

4. Configuration:

   • Before performing conversions, configure the AD7730BR using the SPI interface.
   • Write to the configuration registers to set parameters such as the input channel, gain, and output data rate.
   • Refer to the datasheet for the specific register addresses and bit configurations.

5. Conversion:

   • Start a conversion by writing to the appropriate register or setting a specific bit in the configuration register.
   • Wait for the conversion to complete based on the selected output data rate.
   • Read the conversion result from the data register using the SPI interface.

6. Power Management:

   • To reduce power consumption, use the power-down mode when the ADC is not in use.
   • Enter power-down mode by writing to the appropriate register or setting a specific bit in the configuration register.
   • Exit power-down mode by writing to the same register or bit to resume normal operation.

7. Calibration:

   • Perform calibration to ensure accurate measurements.
   • Use the internal self-calibration feature or external calibration if required.
   • Follow the calibration procedure outlined in the datasheet.

8. Handling and Storage:

   • Handle the AD7730BR with care to avoid static discharge and physical damage.
   • Store the device in a dry environment within the specified storage temperature range.

For detailed information and specific application notes, refer to the AD7730BR datasheet and application notes provided by Analog Devices.

(For reference only)