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Avia semiconductor - 24-Bit Analog-to-Digital Converter

Numéro de référence HX711
Description 24-Bit Analog-to-Digital Converter
Fabricant Avia semiconductor 
Logo Avia semiconductor 





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HX711 fiche technique
HX711
24-Bit Analog-to-Digital Converter (ADC) for Weigh Scales
DESCRIPTION
Based on Avia Semiconductor’s patented
technology, HX711 is a precision 24-bit analog-
to-digital converter (ADC) designed for weigh
scales and industrial control applications to
interface directly with a bridge sensor.
The input multiplexer selects either Channel A
or B differential input to the low-noise
programmable gain amplifier (PGA). Channel A
can be programmed with a gain of 128 or 64,
corresponding to a full-scale differential input
voltage of ±20mV or ±40mV respectively, when
a 5V supply is connected to AVDD analog power
supply pin. Channel B has a fixed gain of 32. On-
chip power supply regulator eliminates the need
for an external supply regulator to provide analog
power for the ADC and the sensor. Clock input is
flexible. It can be from an external clock source, a
crystal, or the on-chip oscillator that does not
require any external component. On-chip power-
on-reset circuitry simplifies digital interface
initialization.
There is no programming needed for the
internal registers. All controls to the HX711 are
through the pins.
FEATURES
• Two selectable differential input channels
• On-chip active low noise PGA with selectable gain
of 32, 64 and 128
• On-chip power supply regulator for load-cell and
ADC analog power supply
• On-chip oscillator requiring no external
component with optional external crystal
• On-chip power-on-reset
• Simple digital control and serial interface:
pin-driven controls, no programming needed
• Selectable 10SPS or 80SPS output data rate
• Simultaneous 50 and 60Hz supply rejection
• Current consumption including on-chip analog
power supply regulator:
normal operation < 1.5mA, power down < 1uA
• Operation supply voltage range: 2.6 ~ 5.5V
• Operation temperature range: -40 ~ +85
• 16 pin SOP-16 package
APPLICATIONS
• Weigh Scales
• Industrial Process Control
Load cell
VAVDD
10uF
AVDD
INA+
INA-
R2 R1
VFB
S8550
BASE
Analog Supply Regulator
INB+
INB-
Input
MUX
24-bit Σ∆
ADC
PGA
Gain = 32, 64, 128
VSUP
VSUP DVDD
2.7~5.5V
Digital
Interface
DOUT
To/From
PD_SCK MCU
RATE
VBG
0.1uF
Bandgap Reference
AGND
Internal
Oscillator
HX711
XI XO
Fig. 1 Typical weigh scale application block diagram
TEL: (592) 252-9530 (P. R. China)
AVIA SEMICONDUCTOR

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