Analog Devices Inc. AD7920BKSZ-500RL7

Overview

AD7920BKSZ-500RL7 from Analog Devices is a 12-bit, 250 kSPS successive approximation ADC with single-supply operation (2.35 V to 5.25 V), internal VDD-referenced conversion, and SPI-compatible serial interface. It features 71 dB SNR at 100 kHz input, 13.5 MHz full-power bandwidth, and 1 μA max standby current - optimized for portable medical sensors and battery-powered data acquisition.

For engineers reviewing the AD7920BKSZ-500RL7 datasheet, AD7920BKSZ-500RL7 pinout, AD7920BKSZ-500RL7 application, or AD7920BKSZ-500RL7 equivalent, key selection factors include its SC70-6 package footprint, no-pipeline-delay architecture, guaranteed 12-bit no-missed-codes performance, and direct compatibility with 3 V/5 V microcontroller SPI buses without external reference or level-shifting.

Technical Context

The AD7920BKSZ-500RL7 implements a charge redistribution SAR architecture with integrated track-and-hold, sampling on the falling edge of CS and completing conversion in 16 SCLK cycles. Its reference is derived directly from VDD, enabling 0 V to VDD analog input range and eliminating external reference components.

It supports flexible serial clock management: conversion rate scales with SCLK (up to 5 MHz), and power-down mode reduces current to 50 nA typical. Timing includes 10 ns aperture delay, 30 ps aperture jitter, and 250 ns track-and-hold acquisition time - critical for high-fidelity signal capture in optical sensor front-ends.

Key Specifications

Pinout & Package

AD7920BKSZ-500RL7 is housed in a 6-lead SC70 package (JEDEC MO-220 variant) with exposed pad not electrically connected. Pin pitch is 0.65 mm; body dimensions are 2.0 mm × 1.25 mm × 0.9 mm (max height).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11100ETE+, AD7920BKSZ-500RL7 uniquely balances ultra-compact SC70 packaging, wide 2.35–5.25 V supply support, and VDD-referenced simplicity - making it optimal for new designs prioritizing size, flexibility, and BOM reduction.

Availability

AD7920BKSZ-500RL7 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and optical sensor interfaces requiring stable component supply and long-term production continuity.

Supply support for AD7920BKSZ-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 AD79xx family - including AD7920BKSZ-500RL7 - was designed specifically for space- and power-constrained data acquisition in portable and distributed sensing applications, emphasizing integration, low quiescent power, and ease of use.

FAQ

What is the maximum sampling rate supported by AD7920BKSZ-500RL7?

The AD7920BKSZ-500RL7 supports a maximum throughput rate of 250 kSPS, achieved when operating with a 5 MHz serial clock and completing conversion in 16 SCLK cycles. This rate is fully specified over the −40°C to +85°C temperature range and across the full 2.35 V to 5.25 V supply voltage range.

Does AD7920BKSZ-500RL7 require an external voltage reference?

No, AD7920BKSZ-500RL7 does not require an external voltage reference. Its conversion reference is derived internally from the VDD supply, enabling a full-scale analog input range of 0 V to VDD. This eliminates external reference components and associated layout sensitivity while maintaining 12-bit accuracy.

What package type is used for AD7920BKSZ-500RL7?

AD7920BKSZ-500RL7 uses a 6-lead SC70 package (also designated as SOT-323), measuring 2.0 mm × 1.25 mm × 0.9 mm. This ultra-small outline is JEDEC-compliant and optimized for high-density portable PCB layouts where board space is constrained.

How does the power-down mode operate on AD7920BKSZ-500RL7?

AD7920BKSZ-500RL7 enters full power-down mode when CS remains high for more than 100 ns after the end of a conversion cycle. In this state, supply current drops to 1 μA maximum (typically 50 nA), and the device retains no state - requiring a full wake-up sequence (≤1 μs) before the next conversion. This mode is essential for battery-life extension in duty-cycled systems.

Is AD7920BKSZ-500RL7 compatible with standard microcontroller SPI interfaces?

Yes, AD7922BKSZ-500RL7 is fully compatible with standard SPI interfaces (including QSPI, MICROWIRE, and DSP serial ports) using CPOL = 0 and CPHA = 0 configuration. Data is clocked out MSB-first on the falling edge of SCLK, with four leading zeros preceding the 12-bit result - requiring no protocol translation in firmware.