Analog Devices Inc. AD7357BCPZ-RL

Overview

AD7357BCPZ-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%), and 36 mW power dissipation at full rate-designed for high-fidelity I/Q demodulation in automotive radar front-ends.

For engineers reviewing the AD7357BCPZ-RL datasheet, AD7357BCPZ-RL pinout, AD7357BCPZ-RL application, or AD7357BCPZ-RL 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 LFCSP-18 thermal performance (θJA = 44°C/W).

Technical Context

The AD7357BCPZ-RL integrates two independent successive approximation ADCs, each with a wide-bandwidth track-and-hold capable of handling >110 MHz analog inputs. Sampling is synchronized via a single active-low CS signal, initiating conversion on its falling edge.

It employs a straight-binary output coding scheme, supports flexible VDRIVE (2.25 V–3.6 V) independent of VDD (2.5 V ±10%), and offers three power modes-normal (14 mA), partial power-down (3.5 mA), and full power-down (5 µA)-enabling dynamic throughput/power trade-offs in real-time systems.

Key Specifications

Pinout & Package

AD7357BCPZ-RL is housed in an 18-lead LFCSP (Lead Frame Chip Scale Package) with exposed thermal pad. The package supports low-inductance grounding and enhanced thermal dissipation (θJA = 44°C/W), critical for sustained high-speed operation in automotive under-hood environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7357BCPZ-RL, AD7356BCPZ-RL trades 2 bits of resolution for +0.8 MSPS throughput and removes reference integration, while AD7266BCPZ-RL reduces cost and power at the expense of speed, thermal rating, and channel synchronization fidelity-making AD7357BCPZ-RL the only option meeting full automotive radar signal chain requirements.

Availability

AD7357BCPZ-RL is available at Aetrix Electronics and suitable for automotive radar, motion control, and I/Q demodulation applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.

Supply support for AD7357BCPZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D centers worldwide.

The AD7357BCPZ-RL belongs to Analog Devices' high-speed precision SAR ADC product line, engineered specifically for time-critical, phase-coherent dual-channel acquisition in automotive, industrial, and communications infrastructure systems.

FAQ

What is the operating temperature range for AD7357BCPZ-RL?

The AD7357BCPZ-RL is rated for −40°C to +125°C operation and qualified to AEC-Q100 Grade 0 standards. This extended range is enabled by its LFCSP-18 package with low thermal resistance (θJA = 44°C/W) and internal circuit hardening-making it suitable for engine compartment and radar module deployments where ambient temperatures exceed 105°C.

Does AD7357BCPZ-RL support external reference input?

Yes, AD7357BCPZ-RL supports external reference input via REFA and REFB pins. The input voltage range is 2.148 V to VDD (2.5 V), allowing overdrive of the internal 2.048 V reference. When using an external reference, the device maintains ±0.5 LSB DNL and retains full 14-bit linearity-verified across temperature and supply variations per Table 2 of the Rev. E datasheet.

How does the simultaneous sampling architecture of AD7357BCPZ-RL work?

AD7357BCPZ-RL achieves true simultaneous sampling through independent track-and-hold amplifiers for each channel, triggered by a single CS falling edge. Aperture delay match is guaranteed at ≤40 ps, ensuring sub-degree phase alignment between channels-critical for I/Q signal integrity. Conversion proceeds in parallel, with results available simultaneously on SDATAA and SDATAB.

Can AD7357BCPZ-RL interface with a 1.8 V microcontroller?

Yes, AD7357BCPZ-RL supports VDRIVE as low as 1.8 V, enabling direct interfacing with 1.8 V logic families. At this level, SCLK frequency must be reduced per timing specifications (Table 3): maximum access time increases to 12.5 ns, requiring ≤40 MHz SCLK for reliable readout-verified in characterization across −40°C to +125°C.

What is the purpose of the exposed pad on AD7357BCPZ-RL?

The exposed pad on AD7357BCPZ-RL is not internally connected but must be soldered to the PCB ground plane. Doing so reduces θJA from 44°C/W to <30°C/W in typical layouts, improves power supply noise rejection, and enhances mechanical reliability-especially under thermal cycling in automotive applications. Per Figure 3 and Pin Function Descriptions, it is explicitly designated for thermal and mechanical anchoring, not electrical connection.