Analog Devices Inc. AD7468BRTZ-REEL

Overview

AD7468BRTZ-REEL from Analog Devices is an 8-bit, micropower successive approximation ADC operating from 1.6 V to 3.6 V supply, delivering 320 kSPS throughput with 0.2 mW power dissipation at 1.8 V/100 kSPS and 0.57 mW maximum at 3 V/100 kSPS. It features a single-ended analog input (0 V to VDD), SPI/QSPI/MICROWIRE-compatible serial interface, and automatic power-down consuming 8 nA typical. It targets ultra-low-power sensor digitization in space-constrained battery-powered systems.

For engineers reviewing the AD7468BRTZ-REEL datasheet, AD7468BRTZ-REEL pinout, AD7468BRTZ-REEL application, or AD7468BRTZ-REEL equivalent, key selection considerations include its 8-bit resolution with ±0.2 LSB INL/DNL, 49 dB SINAD at 30 kHz, 2.94 μs conversion time, SOT-23-6 package footprint, and internal VDD-referenced architecture enabling rail-to-rail input range without external reference.

Technical Context

The AD7468BRTZ-REEL implements a standard successive approximation register (SAR) ADC architecture with integrated track-and-hold, no pipeline delay, and conversion initiated on the falling edge of CS. Its reference is derived directly from VDD, eliminating external reference components and fixing the full-scale input range to 0 V to VDD.

Serial communication uses a 10-cycle SCLK-driven protocol (MSB-first) with four leading zeros followed by 8 data bits; timing is fully synchronous with CS framing and supports flexible clock speeds from 10 kHz to 3.4 MHz. Power management includes automatic entry into 8 nA power-down mode after conversion completion.

Key Specifications

Pinout & Package

AD7468BRTZ-REEL is housed in a 6-lead SOT-23 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit SAR ADC applications.

Compared with ADS7822U and MCP3001-I/P, AD7468BRTZ-REEL uniquely combines sub-2 V operation, 8 nA power-down, SOT-23-6 size, and VDD-referenced simplicity-making it optimal for miniaturized, ultra-low-power, single-supply embedded systems where 8-bit precision suffices.

Availability

AD7468BRTZ-REEL is available at Aetrix Electronics and suitable for portable medical sensors, wireless sensor nodes, industrial process monitoring, and asset health diagnostics requiring stable component supply across long-lifecycle deployments.

Supply support for AD7468BRTZ-REEL 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

AD7468BRTZ-REEL belongs to the AD746x family of micropower SAR ADCs designed specifically for battery-operated instrumentation and isolated data acquisition where minimal power, small size, and supply-voltage flexibility are critical.

FAQ

What is the maximum sample rate supported by the AD7468BRTZ-REEL?

The AD7468BRTZ-REEL supports a maximum throughput rate of 320 kSPS, achieved using a 3.4 MHz serial clock and completing conversion in 10 SCLK cycles. At lower clock frequencies, the throughput scales linearly-for example, 1.7 MHz SCLK yields ~160 kSPS. This rate is sufficient for Nyquist sampling of signals up to 150 kHz and supports burst-mode acquisition in energy-constrained systems.

Does the AD7468BRTZ-REEL require an external voltage reference?

No, the AD7468BRTZ-REEL uses an internal VDD-derived reference, setting its full-scale input range to 0 V to VDD. This eliminates the need for external reference components, reduces BOM cost and PCB area, and ensures the ADC's dynamic range automatically tracks supply voltage variations-critical for battery-powered applications where VDD declines over time.

What is the power consumption of AD7468BRTZ-REEL at 1.8 V and 100 kSPS?

At 1.8 V supply and 100 kSPS throughput, the AD7468BRTZ-REEL draws 120 μA typical supply current, resulting in 0.2 mW power dissipation. In power-down mode, current drops to 8 nA typical-reducing average power significantly in duty-cycled applications. These values are confirmed in Table 3 of the Rev. C datasheet under B-version specifications.

Which serial interface protocols is AD7468BRTZ-REEL compatible with?

The AD7468BRTZ-REEL supports SPI, QSPI, MICROWIRE, and generic DSP serial interfaces. Its SDATA output is three-state and synchronized to the falling edge of SCLK, with CS acting as frame-select. No mode configuration is required-the device operates in standard Mode 0 (CPOL = 0, CPHA = 0) and requires no initialization sequence before data transfer.

What are the absolute maximum ratings for AD7468BRTZ-REEL analog input voltage?

The absolute maximum analog input voltage for AD7468BRTZ-REEL is −0.3 V to VDD + 0.3 V, per Table 5 in the Rev. C datasheet. Exceeding this range risks permanent damage. For reliable operation, the input must remain within the specified 0 V to VDD range, with DC leakage current limited to ±1 μA and input capacitance at 20 pF typical-requiring careful driver impedance design to avoid settling errors.