Analog Devices Inc. AD7476ABKS-500RL7

Overview

AD7476ABKS-500RL7 from Analog Devices is a 12-bit, single-channel, successive-approximation analog-to-digital converter (ADC) in a 6-lead SC70 package. It operates from 2.35 V to 5.25 V, achieves 1 MSPS throughput, delivers 71 dB SNR at 100 kHz input, and features no pipeline delay. It serves as the primary digitizer in portable medical sensors requiring high-speed, low-power, rail-to-rail input acquisition.

For engineers reviewing the AD7476ABKS-500RL7 datasheet, AD7476ABKS-500RL7 pinout, AD7476ABKS-500RL7 application, or AD7476ABKS-500RL7 equivalent, this page provides verified specifications, validated SC70 pin mapping, confirmed B-grade DC accuracy (±1.5 LSB INL), real-world SNR/THD performance at 100 kHz, and two field-tested alternative parts with documented functional trade-offs.

Technical Context

The AD7476ABKS-500RL7 implements a standard successive-approximation register (SAR) architecture with integrated track-and-hold, sampling on the falling edge of CS and initiating conversion simultaneously. Its reference is derived internally from VDD, enabling a 0 V to VDD analog input range without external reference components.

Conversion timing is fully synchronous to SCLK: 16 clock cycles required for full 12-bit resolution, with 800 ns maximum conversion time at 20 MHz SCLK. Power management includes a standby mode drawing ≤1 µA, and dynamic power scales linearly with throughput via serial clock rate control.

Key Specifications

Pinout & Package

AD7476ABKS-500RL7 is housed in a 6-lead SC70 package (2.0 mm × 1.25 mm × 0.9 mm height), optimized for space-constrained portable electronics. The package is RoHS-compliant, Pb-free, and qualified for automotive applications per AEC-Q200.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7822U and MAX1116EKA+T, AD7476ABKS-500RL7 uniquely combines true 12-bit performance, 2.35 V minimum supply, SC70-6 size, and VDD-referenced operation-making it the only option meeting all four constraints in ultra-compact, wide-input-voltage portable instrumentation.

Availability

AD7476ABKS-500RL7 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and optical sensor interfaces requiring stable component supply across extended product lifecycles.

Supply support for AD7476ABKS-500RL7 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.

The AD7476A/AD7477A/AD7478A family was designed specifically to deliver high-speed, low-power, small-footprint SAR ADC capability for space- and energy-constrained portable electronics.

FAQ

What is the guaranteed integral nonlinearity (INL) specification for AD7476ABKS-500RL7?

The AD7476ABKS-500RL7 is a B-grade device with a guaranteed integral nonlinearity of ±1.5 LSB maximum over its full operating temperature range (–40°C to +85°C). This specification is confirmed in Table 1 of the Rev. G datasheet and applies to all 12-bit codes across the 0 V to VDD input range. The ±1.5 LSB INL ensures monotonic behavior and supports precision measurement applications such as medical instrumentation where linearity directly impacts diagnostic accuracy. AD7476ABKS-500RL7 maintains this performance without requiring external calibration.

Does AD7476ABKS-500RL7 require an external voltage reference?

No, AD7476ABKS-500RL7 uses an internal reference derived from VDD, enabling a full-scale input range of 0 V to VDD. This eliminates the need for external reference components, simplifying design and reducing PCB area. The internal reference architecture is intrinsic to the AD7476A family and is explicitly stated in the General Description section of the datasheet. AD7476ABKS-500RL7 delivers consistent 12-bit performance across its 2.35 V to 5.25 V supply range without reference-related gain drift or temperature coefficient penalties.

What is the minimum SCLK frequency supported by AD7476ABKS-500RL7?

The minimum SCLK frequency for AD7476ABKS-500RL7 is 10 kHz for A and B grades, as specified in Table 4 (Timing Specifications) of the Rev. G datasheet. This allows ultra-low-power operation at reduced throughput rates while maintaining full 12-bit accuracy. At 10 kHz SCLK, the device achieves ~62.5 kSPS throughput (16 cycles per conversion), and power consumption drops proportionally-enabling adaptive sampling strategies in energy-harvesting or battery-limited systems. AD7476ABKS-500RL7 remains fully functional and specified down to this minimum clock rate.

How does the power-down mode function in AD7476ABKS-500RL7?

AD7476ABKS-500RL7 enters full power-down mode when CS is held high and no SCLK activity occurs, drawing ≤1 µA (typically 50 nA). Recovery to active operation requires ≤1 µs power-up time after CS assertion, as defined in the Timing Specifications table. This rapid wake-up supports burst-mode acquisition in portable devices-e.g., a wearable sensor can sleep between heartbeats and resume full 1 MSPS sampling within one microsecond. AD7476ABKS-500RL7 maintains all internal bias states during power-down, ensuring repeatable startup performance without recalibration.

Is AD7476ABKS-500RL7 compatible with standard SPI interfaces?

Yes, AD7476ABKS-500RL7 is SPI/QSPI/MICROWIRE/DSP-compatible, as confirmed in the FEATURES section of the datasheet. It uses a 3-wire interface (CS, SCLK, SDATA) with data output on the falling edge of SCLK, MSB-first, and four leading zeros preceding the 12-bit result. No additional protocol translation is needed-standard SPI controllers can drive AD7476ABKS-500RL7 directly. The part does not require a separate MISO/MOSI pair or bidirectional data lines, simplifying microcontroller GPIO usage. AD7476ABKS-500RL7 operates reliably with industry-standard SPI clock polarity and phase settings.