Analog Devices Inc. AD7357BRUZ

Overview

AD7357BRUZ from Analog Devices is a dual, 14-bit, simultaneous-sampling SAR ADC with 4.2 MSPS per channel throughput, 2.048 V on-chip reference (±0.25%), 76.5 dB typical SNR, and differential input architecture optimized for I/Q demodulation and automotive radar signal acquisition.

For engineers reviewing the AD7357BRUZ datasheet, AD7357BRUZ pinout, AD7357BRUZ application, or AD7357BRUZ equivalent, this page delivers verified specifications, validated package mapping to 16-lead TSSOP, confirmed dual-channel timing alignment, and real-world selection guidance for high-speed data acquisition systems requiring matched channel performance.

Technical Context

The AD7357BRUZ integrates two independent successive approximation ADCs sharing a common SCLK and CS control, enabling true simultaneous sampling with aperture delay match ≤40 ps and ADC-to-ADC isolation ≥−100 dB. Its analog front end supports fully differential inputs with ±VREF/2 range referenced to AGND and REFGND, and features track-and-hold bandwidth up to 110 MHz at 3 dB.

Conversion is initiated on the falling edge of CS, with latency fixed at 15.5 SCLK cycles plus t2 (5 ns), and data output via SPI-compatible serial interface on SDATAA and SDATAB pins-each delivering 14-bit straight-binary results MSB-first with two leading zeros. Power management includes Normal, Partial, and Full power-down modes with 36 mW operational dissipation at 4.2 MSPS.

Key Specifications

Pinout & Package

AD7357BRUZ is packaged in a 16-lead TSSOP (RU-16) with exposed pad for thermal enhancement. Pin functions are validated per Analog Devices Rev. E datasheet Figure 2 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 AD7356BRUZ and AD7266BRUZ, the AD7357BRUZ uniquely delivers 14-bit resolution at 4.2 MSPS with guaranteed simultaneous sampling and <40 ps aperture match-making it the only option among the three for radar-grade I/Q coherence and >74 dB SINAD in automotive temperature ranges.

Availability

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

Supply support for AD7357BRUZ 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 precision instrumentation, communications, and industrial markets since 1965.

The AD7357BRUZ belongs to Analog Devices' high-speed SAR ADC product line, engineered specifically for demanding dual-channel applications including automotive radar, software-defined radio, and real-time control systems where channel matching and low-latency conversion are critical.

FAQ

What is the maximum analog input frequency supported by the AD7357BRUZ?

The AD7357BRUZ has a full-power bandwidth of 110 MHz at the 3 dB point and 77 MHz at the 0.1 dB point, enabling accurate digitization of analog signals up to 77 MHz without significant amplitude loss. This specification is measured with a full-scale sine wave input and defines the highest frequency at which the device maintains specified dynamic performance, including SNR and THD, per the Rev. E datasheet Table 2.

Does the AD7357BRUZ require an external reference voltage?

No, the AD7357BRUZ includes an internal 2.048 V reference with ±0.25% initial accuracy and 6 ppm/°C temperature coefficient, sufficient for most high-precision applications. However, REFA and REFB pins support external reference overdrive from 2.148 V to VDD, allowing system-level calibration or improved stability when paired with a precision external reference IC.

How does the AD7357BRUZ achieve simultaneous sampling across both channels?

The AD7357BRUZ uses a shared CS input that triggers both track-and-hold amplifiers on its falling edge, ensuring identical aperture timing. Aperture delay match is guaranteed ≤40 ps, and ADC-to-ADC isolation exceeds −100 dB, preserving phase coherence between channels. This architecture avoids the timing skew inherent in multiplexed or sequentially triggered dual-ADC solutions.

What are the power supply requirements for the AD7357BRUZ?

The AD7357BRUZ requires two supplies: VDD = 2.5 V ±10% (2.25 V to 2.75 V) for analog and core logic, and VDRIVE = 2.25 V to 3.6 V for digital I/O interface level setting. These may be independently regulated; VDRIVE can differ from VDD to optimize noise isolation. Total current draw is 14 mA typical in normal operation at 4.2 MSPS.

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

The AD7357BRUZ shares the same 16-lead TSSOP footprint and pinout with AD7356BRUZ and AD7352BRUZ, enabling drop-in replacement in many layouts. However, differences in resolution (14-bit vs. 12-bit), throughput (4.2 MSPS vs. 5 MSPS/3 MSPS), and reference configuration require firmware and timing adjustments-even though mechanical compatibility exists.