Analog Devices Inc. AD7920BKS-REEL7

Overview

AD7920BKS-REEL7 from Analog Devices is a 12-bit, 250 kSPS successive approximation ADC in a 6-lead SC70 package, operating from a single 2.35 V to 5.25 V supply. It features 71 dB SNR at 100 kHz input, 0–VDD analog input range, SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface, and 1 μA max standby current - used for high-resolution data acquisition in space-constrained battery-powered instrumentation.

For engineers reviewing the AD7920BKS-REEL7 datasheet, AD7920BKS-REEL7 pinout, AD7920BKS-REEL7 application, or AD7920BKS-REEL7 equivalent, key selection considerations include guaranteed 12-bit no-missed-codes performance, internal VDD-referenced conversion, 250 ns track-and-hold acquisition time, and compatibility with low-voltage microcontroller serial interfaces requiring minimal external components.

Technical Context

The AD7920BKS-REEL7 implements a charge redistribution DAC-based successive approximation architecture with precise sampling controlled by the CS falling edge. Conversion timing is fully synchronous to SCLK, requiring exactly 16 clock cycles per sample and exhibiting zero pipeline delay.

It uses an internal track-and-hold amplifier capable of >13 MHz full-power bandwidth and supports flexible power management: normal mode draws 1.4 mA max at 3 V/250 kSPS, while full power-down reduces current to 50 nA typical. Reference is derived directly from VDD, eliminating need for external reference and enabling 0 V to VDD input range.

Key Specifications

Pinout & Package

AD7920BKS-REEL7 is housed in a 6-lead SC70 (SOT-323) package measuring 2.0 mm × 1.25 mm × 0.9 mm, optimized for high-density PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7920BKS-REEL7, AD7923BRUZ offers higher speed and channel count but increases board area and power; ADS7953IRHBT adds channel multiplexing intelligence at the cost of fixed 3-V operation and larger package - AD7920BKS-REEL7 remains optimal for single-channel, ultra-compact, wide-supply applications demanding minimal external components.

Availability

AD7920BKS-REEL7 is available at Aetrix Electronics and suitable for battery-powered systems, portable medical instruments, and wireless sensor nodes requiring stable component supply with consistent parametric performance across production lots.

Supply support for AD7920BKS-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 Wilmington, MA.

The AD79xx family delivers micropower, high-speed SAR ADCs targeting space-constrained, battery-sensitive applications - AD7920BKS-REEL7 specifically addresses demand for 12-bit resolution in sub-2 mm² footprints with zero external reference dependency.

FAQ

What is the guaranteed resolution and no-missing-codes specification for AD7920BKS-REEL7?

AD7920BKS-REEL7 guarantees 12-bit resolution with no missing codes across its full operating temperature range (−40°C to +85°C). This is confirmed in the AD7920 datasheet Rev. C, Table 2, where Differential Nonlinearity is specified as −0.9/+1.5 LSB max and Integral Nonlinearity as ±1.5 LSB max - ensuring monotonic behavior and full 12-bit code coverage under all valid supply and thermal conditions.

Does AD7920BKS-REEL7 require an external voltage reference?

No, AD7920BKS-REEL7 does not require an external voltage reference. Its reference is derived internally from the VDD supply, establishing a 0 V to VDD analog input range. This eliminates external reference components and associated layout sensitivity, as explicitly stated in the General Description and Circuit Information sections of the AD7920 datasheet Rev. C.

What is the minimum and maximum supply voltage for reliable operation of AD7920BKS-REEL7?

AD7920BKS-REEL7 operates reliably from VDD = 2.35 V to 5.25 V, as specified in the Absolute Maximum Ratings and Electrical Specifications tables of the AD7920 datasheet Rev. C. Operation below 2.35 V is not guaranteed; the device may function down to 2.0 V with reduced VINH specification, but full parametric performance (e.g., SNR, THD) applies only within the 2.35–5.25 V range.

How does the AD7920BKS-REEL7 interface with common microcontrollers?

AD7920BKS-REEL7 interfaces directly with microcontrollers via a standard 3-wire SPI-compatible serial interface (CS, SCLK, SDATA), supporting SPI, QSPI, MICROWIRE, and DSP protocols. It requires no special initialization or configuration registers - conversion is triggered by CS falling edge, and data is clocked out MSB-first with four leading zeros, enabling plug-and-play integration with most ARM Cortex-M, PIC, and MSP430 families.

What is the power consumption of AD7920BKS-REEL7 during active conversion at 3 V supply?

At VDD = 3 V and 250 kSPS throughput, AD7920BKS-REEL7 consumes 1.4 mA max in normal operational mode, equating to 4.2 mW max power dissipation. This value is specified in Table 2 of the AD7920 datasheet Rev. C under "Power Dissipation" and reflects worst-case current draw during continuous conversion with 5 MHz SCLK.