Analog Devices Inc. AD7357BRUZ-500RL7

Overview

AD7357BRUZ-500RL7 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 at 500 kHz, and operation from a single 2.5 V supply. It targets high-fidelity I/Q demodulation in automotive radar front-ends where matched channel timing and low inter-channel crosstalk are critical.

For engineers reviewing the AD7357BRUZ-500RL7 datasheet, AD7357BRUZ-500RL7 pinout, AD7357BRUZ-500RL7 application, or AD7357BRUZ-500RL7 equivalent, key selection considerations include simultaneous sampling accuracy, ADC-to-ADC isolation (−100 dB), differential input common-mode range (0.5 V to 1.6 V), SPI-compatible serial interface timing, and −40°C to +125°C Y-grade automotive qualification.

Technical Context

The AD7357BRUZ-500RL7 integrates two independent successive approximation ADCs, each preceded by a wide-bandwidth track-and-hold amplifier supporting >110 MHz full-power bandwidth. Sampling is synchronized via a shared CS input, enabling precise time-aligned acquisition across both channels without external clock skew management.

It employs an internal 2.048 V reference with 6 ppm/°C drift and supports external reference overdrive between 2.148 V and VDD. The serial interface delivers conversion results on separate SDATAA/SDATAB lines with MSB-first 16-cycle readout, compatible with SPI, QSPI, MICROWIRE, and DSP protocols at up to 80 MHz SCLK.

Key Specifications

Pinout & Package

AD7357BRUZ-500RL7 is packaged in a 16-lead TSSOP (RU-16) with exposed pad. 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 simultaneous-sampling ADC applications.

Compared with AD7356BRUZ and AD7352BRUZ, the AD7357BRUZ-500RL7 uniquely delivers 14-bit resolution with simultaneous sampling and integrated reference-making it the only option among the three qualified for automotive radar I/Q digitization requiring >74 dB SINAD and −100 dB isolation.

Availability

AD7357BRUZ-500RL7 is available at Aetrix Electronics and suitable for automotive radar front-ends, industrial motion control systems, and high-speed data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7357BRUZ-500RL7 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 AD7357BRUZ-500RL7 belongs to Analog Devices' high-speed precision SAR ADC product line, designed specifically for demanding simultaneous-sampling applications in automotive radar, communications infrastructure, and industrial instrumentation.

FAQ

What is the guaranteed operating temperature range for AD7357BRUZ-500RL7?

The AD7357BRUZ-500RL7 is rated for −40°C to +125°C operation and carries the Y-grade designation, confirming qualification for automotive under-hood environments. This specification is validated per the AD7357 Rev. E datasheet Absolute Maximum Ratings table and applies to the RU-16 TSSOP package variant shipped as AD7357BRUZ-500RL7.

Does AD7357BRUZ-500RL7 support external reference voltage, and what is the valid input range?

Yes, AD7357BRUZ-500RL7 supports external reference overdrive on REFA and REFB pins. The valid input range is 2.048 V + 100 mV to VDD (i.e., 2.148 V to 2.75 V at nominal 2.5 V ±10% supply), as specified in Table 2 of the Rev. E datasheet under "VREF Input Voltage Range." External reference must be referenced to REFGND.

How is simultaneous sampling implemented in AD7357BRUZ-500RL7, and what is the aperture delay match?

Simultaneous sampling in AD7357BRUZ-500RL7 is controlled by the falling edge of the CS input, which triggers both track-and-hold amplifiers identically. Aperture delay match between channels is guaranteed at 40 ps maximum, ensuring sub-degree phase alignment critical for I/Q signal integrity-verified in the "SAMPLE-AND-HOLD" section of the Rev. E datasheet.

What serial interface protocols is AD7357BRUZ-500RL7 compatible with, and what is the maximum SCLK frequency?

AD7357BRUZ-500RL7 features an SPI-compatible serial interface supporting SPI, QSPI, MICROWIRE, and DSP protocols. The maximum SCLK frequency is 80 MHz, enabling full 14-bit readout in 16 clock cycles with minimal latency. Timing parameters including t42 access time are fully characterized across VDRIVE (2.25 V–3.6 V) and temperature in Table 3 of the Rev. E datasheet.

Is AD7357BRUZ-500RL7 pin-compatible with other devices in the AD735x family, such as AD7356 or AD7352?

No, AD7357BRUZ-500RL7 is not pin-compatible with AD7356BRUZ or AD7352BRUZ. While all three use the 16-lead TSSOP package, pin functions differ significantly-for example, AD7357BRUZ-500RL7 dedicates Pins 3 and 6 to REFA/REFB, whereas AD7352 uses those pins for VDRIVE and DGND. Layout reuse requires verification against individual package drawings and pin function tables.