711 is a 24-bit A/D converter chip designed for high-precision electronic scales. Compared with other chips of the same type, this chip integrates the peripheral circuits required by other chips of the same type, including regulated power supply, on-chip clock oscillator, etc., and has the advantages of high integration, fast response, and strong anti-interference. The whole machine cost of the electronic scale is reduced, and the performance and reliability of the whole machine are improved. The interface and programming of 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 arbitrarily select channel A or channel B, which is connected to its internal low-noise programmable amplifier. The programmable gain of channel A is 128 or 64, and the corresponding full-scale differential input signal amplitude is ±20mV or ±40mV, respectively. Channel B is a fixed gain of 32 for system parameter detection. The regulated power supply provided in the chip can directly supply power to the external sensor and the A/D converter in the chip, and no additional analog power supply is required on the system board. The on-chip clock oscillator does not require any external components. The power-on automatic reset function simplifies the initialization process of power-on.
Two optional differential inputs
· On-chip low noise programmable amplifier with selectable gains of 64 and 128
· On-chip voltage regulator circuit can directly supply power to external sensors and on-chip A/D converter
The on-chip clock oscillator does not require any external devices, and an external crystal oscillator 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 on-chip registers do not need to be programmed
· Selectable 10Hz or 80Hz output data rate
· Simultaneous suppression of 50Hz and 60Hz power disturbances
· Power consumption (including regulated power supply circuit): Typical operating current: < 1.7mA, power-off current: < 1μA
· Operating voltage range: 2.6 ~ 5.5V
· Operating temperature range: -20 ~ +85℃
· 16-pin SOP-16 package