Analog Devices Inc. AD7495BRM-REEL7

Overview

AD7495BRM-REEL7 from Analog Devices is a 12-bit, 1 MSPS successive-approximation ADC with on-chip 2.5 V reference, single-supply operation (2.7 V to 5.25 V), SPI-compatible serial interface, and 68 dB SINAD at 300 kHz input - used in portable medical instruments and battery-powered data acquisition systems.

For engineers reviewing the AD7495BRM-REEL7 datasheet, AD7495BRM-REEL7 pinout, AD7495BRM-REEL7 application, or AD7495BRM-REEL7 equivalent, key selection considerations include internal reference accuracy (±1.5% over temperature), VDRIVE logic-level independence, 1 µA full shutdown current, and MSOP-8 package compatibility with space-constrained embedded signal chains.

Technical Context

The AD7495BRM-REEL7 implements a capacitive DAC-based successive-approximation architecture with no pipeline delay, enabling precise sampling control via CS falling edge and deterministic conversion timing tied directly to SCLK frequency (up to 20 MHz). Its track-and-hold supports full-scale step acquisition in ≤325 ns.

It integrates a buffered 2.5 V reference (REF OUT) with 50 ppm/°C tempco and 10 Ω output impedance, eliminating external reference components while maintaining 12-bit linearity (±1 LSB DNL, ±1 LSB INL typ at 3 V). The VDRIVE pin decouples logic interface voltage (2.7 V–5.25 V) from analog supply (VDD), enabling direct interfacing to mixed-voltage microcontrollers.

Key Specifications

Pinout & Package

AD7495BRM-REEL7 is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), optimized for compact PCB layouts in portable instrumentation and IoT edge nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7475BRM-REEL7, AD7495BRM-REEL7 trades slightly higher operational power (6 mW vs. 4.5 mW @ 3 V) for significant system-level simplification via its buffered on-chip reference and VDRIVE decoupling - making it preferable in new designs prioritizing layout density and supply chain reduction over marginal power savings.

Availability

AD7495BRM-REEL7 is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data loggers, industrial motor feedback systems, and optical sensor interfaces requiring stable component supply across multi-year production cycles.

Supply support for AD7495BRM-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7495BRM-REEL7 belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, high-speed digitization in space- and energy-constrained embedded systems where integration, reliability, and ease of use are critical.

FAQ

What is the reference voltage source for AD7495BRM-REEL7?

The AD7495BRM-REEL7 features an integrated, buffered 2.5 V reference accessible at the REF OUT pin (Pin 1). It has ±1.5% initial accuracy, 50 ppm/°C temperature coefficient, and 10 Ω output impedance. A minimum 100 nF capacitor must be placed between REF OUT and GND. This eliminates the need for an external reference IC in most applications, unlike the AD7475BRM-REEL7 which requires external REF IN.

Does AD7495BRM-REEL7 support true 1 MSPS continuous conversion?

Yes, AD7495BRM-REEL7 achieves a maximum throughput rate of 1 MSPS when operated with a 20 MHz SCLK and VDD between 2.7 V and 5.25 V. Each conversion requires exactly 16 SCLK cycles (≤800 ns at 20 MHz), and the device exhibits no pipeline delay - meaning the result corresponds precisely to the sample acquired on the CS falling edge, with deterministic timing critical for real-time control loops.

How does the VDRIVE pin function in AD7495BRM-REEL7?

The VDRIVE pin on AD7495BRM-REEL7 sets the logic threshold for all digital interface pins (CS, SCLK, SDATA), independently of the analog supply VDD. This allows interfacing directly with 3 V microcontrollers while VDD operates at 5 V - eliminating level shifters. VINH = VDRIVE − 1 V min and VINL = 0.4 V max ensure robust noise margins across voltage combinations.

What power-saving modes does AD7495BRM-REEL7 offer?

AD7495BRM-REEL7 provides three power states: Normal Mode (2 mA max @ 3 V, 1 MSPS), Partial Power-Down (230 µA max static), and Full Power-Down (1 µA max). Power state is controlled via CS timing - holding CS high for >100 ns after conversion enters partial shutdown; asserting CS high for >1 µs enters full shutdown. Recovery time from full shutdown is 650 µs.

Is AD7495BRM-REEL7 pin-compatible with AD7475BRM-REEL7?

Yes, AD7495BRM-REEL7 and AD7475BRM-REEL7 share identical 8-lead MSOP pinouts and footprint, but Pin 1 functionality differs: AD7495BRM-REEL7 uses Pin 1 as REF OUT (output), while AD7475BRM-REEL7 uses Pin 1 as REF IN (input). Swapping them without circuit modification will cause functional failure - the reference path must be redesigned accordingly.