Analog Devices Inc. AD7357BRUZ-RL

Overview

AD7357BRUZ-RL from Analog Devices is a dual, 14-bit, simultaneous-sampling SAR ADC with differential inputs, 4.2 MSPS per channel throughput, on-chip 2.048 V reference (±0.25%, 6 ppm/°C), and 36 mW power dissipation at full rate - used in automotive radar I/Q demodulation where precise time-aligned sampling of two analog channels is required.

For engineers reviewing the AD7357BRUZ-RL datasheet, AD7357BRUZ-RL pinout, AD7357BRUZ-RL application, or AD7357BRUZ-RL equivalent, key selection criteria include guaranteed simultaneous sampling control via CS, dual independent serial data outputs (SDATAA/SDATAB), 110 MHz full-power bandwidth, −100 dB ADC-to-ADC isolation, and support for −40°C to +125°C operation in automotive-grade LFCSP packaging.

Technical Context

The AD7357BRUZ-RL integrates two fully independent successive approximation ADCs, each with its own differential track-and-hold amplifier capable of handling input frequencies up to 110 MHz. Sampling is synchronized by the falling edge of the CS signal, initiating conversion and ensuring precise inter-channel timing alignment.

It employs a high-speed SPI-compatible serial interface with separate SDATAA and SDATAB outputs enabling true parallel readout of both 14-bit results - or sequential readout on one line - while supporting flexible VDRIVE (2.25 V–3.6 V) and VDD (2.25 V–2.75 V) supplies for mixed-voltage system interfacing.

Key Specifications

Pinout & Package

AD7357BRUZ-RL is packaged in an 18-lead LFCSP (Lead Frame Chip Scale Package) with exposed thermal pad, optimized for high-density PCB layouts and enhanced thermal performance (θJA = 44°C/W). Pin functions are validated per Analog Devices Rev. E datasheet Figure 3 and Table 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, high-speed SAR ADC applications.

Compared with AD7357BRUZ-RL, AD7356 offers higher speed at reduced resolution and no internal reference, while AD7266 provides simpler interface options and lower power but sacrifices simultaneous sampling fidelity and bandwidth - making AD7357BRUZ-RL uniquely suited for phase-critical dual-channel acquisition.

Availability

AD7357BRUZ-RL is available at Aetrix Electronics and suitable for automotive radar front-ends, industrial motion control systems, and RFID reader signal chains requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7357BRUZ-RL 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7357 is part of Analog Devices' high-speed precision SAR ADC product line, engineered specifically for time-coherent dual-channel digitization in radar, instrumentation, and communications infrastructure where channel matching and low-latency serial interface are critical.

FAQ

What is the operating temperature range for AD7357BRUZ-RL?

The AD7357BRUZ-RL is rated for −40°C to +125°C operation (Y grade), qualified per AEC-Q100 for automotive applications. This rating applies to the LFCSP package variant and ensures reliable performance in engine bay and radar module environments where ambient temperatures exceed 105°C.

Does AD7357BRUZ-RL support true simultaneous sampling of both channels?

Yes, AD7357BRUZ-RL guarantees simultaneous sampling via a shared CS signal that triggers both track-and-hold amplifiers at the same instant. Aperture delay match is specified at 40 ps maximum, and ADC-to-ADC isolation is −100 dB, confirming minimal inter-channel coupling during concurrent acquisition.

Can AD7357BRUZ-RL use an external reference instead of the internal 2.048 V source?

Yes, AD7357BRUZ-RL allows external reference overdrive on REFA and REFB pins. The input voltage range is 2.148 V to VDD (max 2.75 V), and the internal reference buffer remains active to drive external circuitry. This enables system-level reference sharing or higher-accuracy external references.

What serial interface protocols does AD7357BRUZ-RL support?

AD7357BRUZ-RL supports SPI-, QSPI-, MICROWIRE-, and DSP-compatible serial interfaces. It uses a standard 4-wire interface (CS, SCLK, SDATAA, SDATAB) with MSB-first, 16-clock-cycle readout (two leading zeros + 14 data bits), and supports daisy-chain or independent channel readout.

Is the AD7357BRUZ-RL pin-compatible with other devices in the AD735x family?

No, AD7357BRUZ-RL (18-lead LFCSP) is not pin-compatible with AD7356 (also LFCSP-18 but different pin mapping) or AD7266 (LFCSP-20). Pin functions differ significantly - especially REFA/REFB placement and SDATA routing - requiring unique PCB layout for each variant.