Блог компании Mingjiada Electronics Supplies the AD7705: a 16-bit, Low-cost, Σ-Δ ADC, Ideal For DC and Low-frequency AC Measurements

In the field of precision measurement and industrial control, how to achieve high-resolution analog signal acquisition at a reasonable cost has always been a core issue that engineers are concerned about. ADI's AD7705 is a complete 16-bit, low-cost, sigma-delta analog-to-digital converter designed to address this need, tailored for DC and low-frequency AC measurement applications. Shenzhen Mingjiada Electronics Co., Ltd., as a globally renowned distributor of electronic components, has long supplied the full range of AD7705 models, providing customers in the fields of instrumentation, industrial control, and medical equipment with original stock and one-stop order matching services.

I. A Quick Overview of AD7705 Core Technical Parameters
Resolution: 16 bits, no lost code
Nonlinearity: 0.003%
Input channels: 2 fully differential input channels (AD7706 has 3 pseudo-differential channels)
Programmable gain: 1 to 128, on-chip PGA, no external signal conditioning required
Operating voltage: 2.7 V ~ 3.3 V or 4.75 V ~ 5.25 V
Power consumption: maximum 1 mW @ 3 V
Standby current: Max 8 µA
Interface: Three-wire serial interface (SPI, QSPI, MICROWIRE, DSP compatible)
Package: 16 pin DIP/SOIC/TSSOP
Update rate: Up to 500 SPS

II. Why is the AD7705 suitable for DC and low-frequency AC measurements?
The AD7705 uses sigma-delta modulation technology, combined with an on-chip digital filter, to achieve extremely high effective resolution. With a gain of 128 and a bandwidth of 13.1 Hz, the output RMS noise is only 0.6 µV; With a 5V supply, the RMS noise specification of 4.1 µV is sufficient to meet the needs of the vast majority of precision DC measurements.

For low-frequency AC measurement scenarios, the AD7705's sinc³ digital filter can effectively suppress power frequency interference. Combined with precision rectifier circuits and software calibration, it can achieve accurate measurement of AC effective values, especially suitable for low-frequency AC signal acquisition below 10 Hz.

The integrated on-chip programmable gain amplifier (PGA) supports gain settings from 1 to 128, which means that the millivolt-level weak signal output by the sensor can be directly connected to the AD7705 without the need for additional external amplification circuitry, reducing system costs and noise introduction into the signal chain.

III. Typical application scenarios
With its high resolution, wide dynamic range, self-calibration, and low power consumption, the AD7705 has a wide range of applications in the following fields:
Pressure measurement: Directly cooperates with bridge pressure sensors to achieve precise acquisition using differential input and PGA.
Instrument Measurement: High Resolution Conversion of Tiny Signals in Intelligent Instruments
Industrial control: Acquisition of analog quantities such as temperature, pressure, and flow rate in process control
Loop power supply system: maximum power consumption of 1mW at 3V makes it suitable for 4-20mA loop power supply applications
Battery-powered devices: 8µA standby current significantly extends the battery life of portable devices.
Medical equipment: Scenarios such as patient monitoring and portable diagnostic equipment that require both accuracy and power consumption.

IV. Mingjiada Electronics AD7705 Spot Supply and Procurement Advantages
Shenzhen Mingjiada Electronics Co., Ltd. (established in 1996, Shenzhen) is a globally renowned authorized independent distributor of electronic components, with branches in Hong Kong, Japan, Russia, Taiwan and other places. The company has obtained ISO9001:2014 and ISO14001:2014 certifications and has established a comprehensive supply chain system.

For the AD7705 series, Mingjiada Electronics currently offers the following models:
AD7705BRUZ - 3V/5V, 1 MW, Dual Channel Differential, 16-Bit Sigma-Delta ADC (TSSOP-16)

Welcome to visit Mingjiada Electronics' official website www.integrated-ic.com for the latest inventory and quotes, or contact the sales team directly for inquiries.

Procurement advantages:
Original products are guaranteed to be genuine; all products undergo strict quality verification.
Covers the entire ADI product line and supports one-stop order matching.
Stable supply channels, ample stock, and controllable delivery times

Tags: AD7705BRUZ, AD7705BRU, AD7705BR, AD7705B, AD7705