Analog Devices Inc. AD7911AUJ-REEL7

Overview

AD7911AUJ-REEL7 from Analog Devices is a 10-bit, dual-channel successive approximation ADC with 250 kSPS throughput, operating from a single 2.35 V to 5.25 V supply and delivering 61 dB SINAD at 100 kHz input. It features no pipeline delay, channel-selectable conversion via DIN, and integrated track-and-hold for battery-powered medical instruments and portable data acquisition systems.

For engineers reviewing the AD7911AUJ-REEL7 datasheet, AD7911AUJ-REEL7 pinout, AD7911AUJ-REEL7 application, or AD7911AUJ-REEL7 equivalent, this page delivers verified specifications, TSOT-8 package details, SPI-compatible serial interface behavior, channel-to-channel isolation of −90 dB, and design-meaningful alternatives for low-power, dual-input signal digitization in space-constrained embedded systems.

Technical Context

The AD7911AUJ-REEL7 implements a true successive approximation register (SAR) architecture with external CS-controlled sampling initiation and SCLK-synchronized conversion timing-no latency or pipelining. Its internal track-and-hold amplifier supports full-power bandwidth up to 8.5 MHz and acquisition time ≤290 ns, enabling accurate digitization of fast transients across both VIN0 and VIN1 inputs.

Conversion is initiated on the falling edge of CS, with channel selection determined by the third MSB of the DIN stream. The serial output includes a channel identifier bit and two leading zeros, followed by 10-bit straight binary data (MSB first) plus two trailing zeros-ensuring unambiguous source attribution without external multiplexing logic.

Key Specifications

Pinout & Package

AD7911AUJ-REEL7 is housed in an 8-lead TSOT package (2.1 mm × 1.6 mm × 0.55 mm), optimized for high-density PCB layouts in portable instrumentation. Pin assignments are fully validated per Analog Devices' Rev. A datasheet Figure 8 and Table 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel SAR ADC applications.

Compared with AD7911AUJ-REEL7, AD7921AUJ-REEL7 trades higher resolution and SNR for increased power (13.5 mW at 5 V), while ADS7822U reduces cost and supply flexibility but removes hardware-assisted channel tagging-requiring additional GPIO or timing logic to distinguish VIN0/VIN1 results.

Availability

AD7911AUJ-REEL7 is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data loggers, industrial handheld testers, and optical sensor signal conditioning requiring stable component supply across extended production lifecycles.

Supply support for AD7911AUJ-REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D and manufacturing operations spanning 15 countries.

The AD7911AUJ-REEL7 belongs to Analog Devices' precision SAR ADC product line, engineered specifically for low-power, dual-input data acquisition in space- and energy-constrained portable and battery-operated systems.

FAQ

What is the maximum sampling rate supported by the AD7911AUJ-REEL7?

The AD7911AUJ-REEL7 supports a maximum throughput rate of 250 kSPS, achieved with a 5 MHz SCLK and 14-cycle conversion time. This rate is guaranteed across the full −40°C to +85°C operating temperature range and all valid VDD voltages (2.35 V to 5.25 V). At lower SCLK frequencies, throughput scales linearly-for example, 2 MHz SCLK yields ~71 kSPS.

Does the AD7911AUJ-REEL7 require an external voltage reference?

No, the AD7911AUJ-REEL7 uses an internal reference derived from VDD, enabling a full-scale input range of 0 V to VDD without external components. This simplifies BOM and layout while maintaining accuracy-integral nonlinearity remains ±0.5 LSB max and offset error match is ±0.3 LSB max across temperature.

How does channel selection work on the AD7911AUJ-REEL7?

Channel selection on the AD7911AUJ-REEL7 is controlled via the DIN pin: the third MSB of the serial data written during CS assertion determines whether VIN0 or VIN1 is sampled. The DOUT stream includes a dedicated channel identifier bit, allowing firmware to unambiguously associate each 10-bit result with its source-eliminating need for external multiplexers or GPIO tracking.

What package type is used for the AD7911AUJ-REEL7?

The AD7911AUJ-REEL7 is supplied in an 8-lead TSOT package (2.1 mm × 1.6 mm × 0.55 mm), specified in Analog Devices' datasheet Rev. A Figure 8. This ultra-compact leaded package supports reflow soldering and provides thermal impedance of 207°C/W (θJA), making it suitable for thermally constrained portable PCBs.

Is the AD7911AUJ-REEL7 compatible with standard SPI interfaces?

Yes, the AD7911AUJ-REEL7 is fully compatible with SPI, QSPI, MICROWIRE, and DSP serial protocols. It uses standard four-wire operation (CS, SCLK, DIN, DOUT), accepts SCLK up to 5 MHz, and outputs data on the falling edge of SCLK. No special framing or clock polarity requirements apply-enabling direct connection to common microcontrollers without level shifters or protocol adapters.