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Mingjiada Electronics Supply ADI AD7991 4-Channel, 12-Bit Analog To Digital Converters With I2C Compatible Interface

In portable instruments, industrial sensing, medical electronics and communications equipment, multi-channel analogue signal acquisition often faces multiple challenges, including limited PCB space, tight power consumption budgets and compressed design cycles. Shenzhen Mingjiada Electronics Co., Ltd. — a long-standing supplier of the [ADI] AD7991, a 4-channel, 12-bit ADC with an I²C-compatible interface — offers a highly integrated solution for space-constrained data acquisition systems, featuring an ultra-compact package, low power consumption and flexible multi-channel configuration capabilities.

Product Overview:
The AD7991 is a 4-channel, 12-bit successive approximation register (SAR) analogue-to-digital converter (ADC) launched by ADI. It features a built-in I²C-compatible serial interface and supports standard, fast and high-speed modes, enabling convenient integration with microcontrollers, FPGAs and processor systems. The device is housed in an ultra-compact SOT-23 package (with some variants featuring an 8-pin SOT-23 configuration), enabling multiplexed acquisition of four analogue inputs within a minimal board footprint, making it particularly suitable for space-constrained, compact designs.
The AD7991 supports single-supply operation and features an on-chip sample-and-hold circuit with selectable reference voltages. With its high conversion rate and low power consumption, it significantly extends battery life in portable and battery-powered applications. Its I²C interface supports multi-device address configuration, facilitating system expansion to include multiple acquisition channels.

AD7991 Key Specifications at a Glance:
Resolution: 12 bits
Analogue input channels: 4 single-ended; or 3 single-ended + 1 reference input
Conversion time: 1 µs (typical)
Input signal bandwidth: Sample-and-hold supports input signals up to 14 MHz
Supply voltage (VDD): 2.7 V to 5.5 V
Analogue input range: 0 V to VREF
Serial interface: I²C-compatible, supporting standard, fast and high-speed modes
Quiescent current: 1 µA maximum
Operating temperature: −40 °C to +125 °C
Package: 8-pin SOT-23

AD7991 Product Features:
12-bit ADC with fast conversion time: 1 µs (typical)
4 analogue input channels / 3 analogue input channels and 1 reference voltage input channel
Rated voltage (VDD): 2.7 V to 5.5 V
Sequencer operation
Temperature range: –40 °C to +125 °C
I²C-compatible serial interface, supporting standard, fast and high-speed modes
Two versions allow the use of two I²C addresses
Low power consumption
Shutdown mode: 1 µA (maximum)
8-pin SOT-23 package

With its compact combination of 4 channels, 12-bit resolution and an I²C interface, the AD7991 is widely used in:
System monitoring
Battery-powered systems
Data acquisition
Medical instruments

Availability Information
Shenzhen Mingjiada Electronics Co., Ltd. — a long-standing distributor of the ADI product range — maintains a constant stock of the AD7991 series low IQ synchronous buck converter modules (including AD7991YRJZ-0500RL7, AD7991YRJZ-0RL, AD7991YRJZ-1500RL7 and corresponding reel-and-tape models), and supports sample requests, small-batch purchases and full-reel supply. To confirm specific part numbers, stock levels and real-time prices, please contact Mingjiada Electronics directly for a quotation.
Company URL: https://www.integrated-ic.com/
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