Analog Devices Inc. AD7911AUJZ-R2

Overview

AD7911AUJZ-R2 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 high-fidelity sampling in portable instrumentation.

For engineers reviewing the AD7911AUJZ-R2 datasheet, AD7911AUJZ-R2 pinout, AD7911AUJZ-R2 application, or AD7911AUJZ-R2 equivalent, this page delivers verified specifications, real-world timing behavior, validated TSOT-8 package mapping, confirmed SPI/QSPI/MICROWIRE/DSP interface compatibility, and precise channel-isolation–driven design guidance for battery-powered data acquisition.

Technical Context

The AD7911AUJZ-R2 implements a true successive approximation register (SAR) architecture with internal reference derived from VDD, enabling full-scale analog input range of 0 V to VDD. Conversion is initiated on the falling edge of CS, with sampling synchronized to that same edge-eliminating aperture uncertainty beyond the specified 10 ns aperture delay and 30 ps jitter.

Its serial interface uses SCLK as both data clock and conversion timing source: 14 SCLK cycles complete conversion (max 2.8 μs at 5 MHz), and DOUT outputs a serial stream containing two leading zeros, channel ID bit, invalid bit, then 10-bit MSB-first data with two trailing zeros. Channel-to-channel isolation is −90 dB typ, ensuring minimal crosstalk during interleaved or sequential sampling.

Key Specifications

Pinout & Package

AD7911AUJZ-R2 is housed in an 8-lead TSOT package (2.1 mm × 1.6 mm × 0.8 mm), optimized for space-constrained portable designs. Pin numbering follows standard top-view orientation with pin 1 marked by dot or bevel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7921AUJZ-R2 and ADS7822U, the AD7911AUJZ-R2 uniquely balances 10-bit precision, 250 kSPS speed, multi-protocol serial compatibility, and ultra-low 6 mW operational power-making it the optimal choice for cost- and power-sensitive dual-channel acquisition where 12-bit resolution is unnecessary.

Availability

AD7911AUJZ-R2 is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, and industrial sensor fusion nodes requiring stable component supply, long-lifecycle assurance, and guaranteed TSOT-8 packaging consistency.

Supply support for AD7911AUJZ-R2 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 over 50 years of innovation in precision data conversion and signal conditioning.

The AD7911AUJZ-R2 belongs to Analog Devices' precision SAR ADC product line, engineered specifically for low-power, dual-channel, single-supply data acquisition in space- and energy-constrained portable and industrial systems.

FAQ

What is the maximum sampling rate supported by the AD7911AUJZ-R2?

The AD7911AUJZ-R2 supports a maximum throughput rate of 250 kSPS under specified conditions (VDD = 2.35 V to 5.25 V, fSCLK = 5 MHz). This is achieved with a fixed 14 SCLK-cycle conversion time, resulting in a minimum conversion period of 2.8 μs. At lower SCLK frequencies, throughput scales linearly-e.g., 2 MHz SCLK yields ~143 kSPS. The AD7911AUJZ-R2 does not support oversampling or decimation modes.

Does the AD7911AUJZ-R2 require an external voltage reference?

No, the AD7911AUJZ-R2 uses an internal reference derived from the VDD supply, establishing a full-scale input range of 0 V to VDD. This eliminates the need for external reference components, reduces board area, and simplifies power domain design. The reference tracking error is included in the total unadjusted error (TUE) specification of ±0.5 LSB max, verified across temperature and supply variations.

How is channel selection implemented on the AD7911AUJZ-R2?

Channel selection on the AD7911AUJZ-R2 is performed via the DIN pin: the third most significant bit (MSB) of the 16-bit serial frame written during CS assertion determines whether VIN0 or VIN1 is converted. Writing '0' selects VIN0; writing '1' selects VIN1. This occurs on the falling edge of SCLK, and the selected channel is sampled on the subsequent falling edge of CS-ensuring deterministic, software-controllable dual-channel sequencing without external mux hardware.

What serial interface protocols is the AD7911AUJZ-R2 compatible with?

The AD7911AUJZ-R2 is explicitly compatible with SPI®, QSPI™, MICROWIRE™, and DSP serial interfaces per its datasheet. It supports standard 4-wire operation (CS, SCLK, DIN, DOUT) with CPOL = 0 and CPHA = 0 timing. The DOUT output is three-state controlled by CS, and data is clocked out MSB-first on the falling edge of SCLK. No configuration registers or mode pins are required-interfacing is plug-and-play with any controller supporting these protocols.

What is the channel-to-channel isolation performance of the AD7911AUJZ-R2?

The AD7911AUJZ-R2 delivers −90 dB typical channel-to-channel isolation, measured by applying a full-scale 20 kHz–500 kHz sine wave to the nonselected input while digitizing a 10 kHz signal on the selected channel. This high isolation is achieved through on-chip multiplexer design and differential sampling architecture, enabling simultaneous high-fidelity acquisition from two independent sensors (e.g., temperature and pressure) without hardware guard bands or sequential settling delays.