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1. Overview
LC AD7705 module is AD acquisition module, there are two full differential input channels. AD7705 inside with a programmable gain amplifier, chip internal input with buffer amplifier, so can directly connected sensor.
2. The function and characteristics
● Working voltage: 3.3V or 5.5V;
● MCU interface: SPI;
● Maximum power consumption: 3V voltage, maximum power consumption is 1mW;
● Standby current: A maximum of 8uA.
3. Introduced the hardware and instructions
● The board size: 30*16mm
● The board function description:
VCC: The power supply side;
GND: Ground;
DRDY: Logic output;
DOUT: Serial data output;
DIN: Serial data input;
SCK: The serial clock;
CS: Chip Selection;
RST: Reset terminal;
AIN1+: Sampling points of the anode;
AIN1-: Sampling points of the negative; //Get rid of R3 can make differential input
AIN2+: Sampling points of the anode;
AIN2-: Sampling points of the negative; // Get rid of R6 can make differential input
Remove the R2,R5 can improve the input impedance.