Analog Devices Inc. AD7490WBCSZ

Overview

AD7490WBCSZ from Analog Devices is a 12-bit, 16-channel, successive approximation ADC with integrated channel sequencer, operating at up to 1 MSPS throughput on a single 2.7 V to 5.25 V supply. It delivers 69.5 dB SNR at 50 kHz input frequency, supports flexible 0 V to REFIN or 0 V to 2 × REFIN input ranges, and features SPI/QSPI/MICROWIRE/DSP-compatible serial interface - used in multichannel system monitoring and automotive power line monitoring.

For engineers reviewing the AD7490WBCSZ datasheet, AD7490WBCSZ pinout, AD7490WBCSZ application, or AD7490WBCSZ equivalent, key selection criteria include guaranteed AEC-Q100 qualification for −40°C to +125°C operation, 16 single-ended inputs with programmable sequencing, no pipeline delay, full shutdown current ≤0.5 µA, and VDRIVE-independent 3 V/5 V logic interfacing.

Technical Context

The AD7490WBCSZ implements a track-and-hold amplifier with 8.2 MHz full-power bandwidth and 50 ps aperture jitter, enabling accurate sampling of signals beyond 1 MHz. Its conversion timing is fully synchronized to the SCLK falling edge, with acquisition time fixed at 300 ns for both full-scale and sine-wave inputs.

Control logic uses a 16-bit register with configurable RANGE, CODING, SEQ, and SHADOW bits to select input range (0 V–REFIN or 0 V–2×REFIN), output coding (straight binary or twos complement), and sequencer behavior. The sequencer cycles through preprogrammed channels without host intervention after initialization.

Key Specifications

Pinout & Package

AD7490WBCSZ is housed in a 32-lead LFCSP (Lead Frame Chip Scale Package) with exposed pad, optimized for thermal performance (θJA = 108.2°C/W) and high-density PCB layouts. All NC pins must be connected to AGND; exposed pad requires solder connection to GND plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel SAR ADC applications.

Compared with AD7490WBCSZ, AD7492WBCPZ offers half the channel count without sequencer functionality, while ADS8684IPWR trades channel density and automotive qualification for higher resolution - making AD7490WBCSZ uniquely balanced for AEC-Q100 multichannel monitoring where 12-bit fidelity and autonomous sequencing are mandatory.

Availability

AD7490WBCSZ is available at Aetrix Electronics and suitable for automotive power line monitoring, battery-powered data loggers, and industrial process control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7490WBCSZ 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 AD7490 belongs to Analog Devices' precision data acquisition portfolio, designed specifically for high-speed, multichannel, low-power measurement in automotive, industrial, and instrumentation systems demanding AEC-Q100 reliability.

FAQ

What is the operating temperature range for AD7490WBCSZ?

The AD7490WBCSZ is rated for −40°C to +125°C operation and is AEC-Q100 qualified for automotive applications. This W-grade variant guarantees full electrical performance across that extended range, unlike the B-grade (−40°C to +85°C). Thermal design must account for θJA = 108.2°C/W in the 32-lead LFCSP package.

Does AD7490WBCSZ support true differential input configurations?

No, AD7490WBCSZ supports only 16 single-ended analog inputs. It does not implement true differential input pairs or internal programmable gain amplifiers. Input channels VIN0–VIN15 are referenced to AGND, and full-scale range is set relative to REFIN - either 0 V to REFIN or 0 V to 2 × REFIN - with no hardware-configurable differential mode.

How does the channel sequencer in AD7490WBCSZ operate?

The AD7490WBCSZ sequencer is controlled via the SEQ bit and sequence register. When enabled, it autonomously cycles through a user-defined subset of VIN0–VIN15 in ascending order, performing one conversion per channel per sequence cycle. No host intervention is required after initial register setup, reducing firmware overhead in continuous monitoring applications.

Can AD7490WBCSZ interface directly with a 3.3 V microcontroller while powered from 5 V?

Yes. AD7490WBCSZ uses separate VDD (2.7–5.25 V for analog core) and VDRIVE (2.7–5.25 V for digital I/O) supplies. Setting VDRIVE = 3.3 V allows direct connection to 3.3 V logic levels for CS, SCLK, DIN, and DOUT - even when VDD = 5 V - eliminating external level shifters.

What is the minimum SCLK frequency required for reliable operation of AD7490WBCSZ?

AD7490WBCSZ has no specified minimum SCLK frequency; it supports DC to 20 MHz. In practice, the lowest usable frequency depends on system timing constraints and desired throughput. For low-power applications, SCLK can be gated or slowed to reduce average power - e.g., 100 kHz for 6.25 kSPS - while maintaining full functionality and accuracy.