711 is a 24-bit A/D converter chip specially designed for high-precision electronic scales.Compared with other chips of the same type, this chip integrates peripheral circuits required by other chips of the same type, including regulated power supply, on-chip clock oscillator, etc. It has the advantages of high integration, fast response speed, and strong anti-interference. The overall cost of the electronic scale is reduced, and the performance and reliability of the overall machine are improved. The interface and programming between the chip and the back-end MCU chip are very simple, all control signals are driven by pins, and there is no need to program the internal registers of the chip. The input selection switch can select channel A or channel B arbitrarily, which is connected to its internal low-noise programmable amplifier. The programmable gain of channel A is 128 or 64, and the corresponding full-rated differential input signal amplitude is ±20mV or ±40mV, respectively. Channel B has a fixed gain of 32, which is used for system parameter detection. The regulated power supply provided in the chip can directly provide power to external sensors and the A/D converter in the chip, and no additional analog power supply is required on the system board. The clock oscillator in the chip does not require any external devices. The power-on automatic reset function simplifies the initialization process of power-on.

Two selectable differential inputs· On-chip low-noise programmable amplifier with selectable gains of 64 and 128· On-chip voltage regulator circuit can directly provide power to external sensors and on-chip A/D converters· The on-chip clock oscillator does not require any external devices, and an external crystal or clock can also be used if necessary· Power-on automatic reset circuit· Simple digital control and serial communication: all controls are input by pins, and the registers on the chip do not need to be programmed· Selectable output data rate of 10Hz or 80Hz· Simultaneous suppression of 50Hz and 60Hz power interference· Power consumption (including regulated power supply circuit): Typical working current: <1.7mA, power-off current: <1μA· Operating voltage range: 2.6 ~ 5.5V· Operating temperature range: -20 ~ +85℃· 16-pin SOP-16 package