Analog Devices Inc. AD4697BCPZ-RL7

Overview

AD4697BCPZ-RL7 from Analog Devices is a 16-bit, 8-channel, 500 kSPS multiplexed SAR ADC with Easy Drive architecture, on-chip oversampling (OSR = 64), ±1 LSB INL, and 93 dB SINAD at 1 kHz - designed for precision photodiode monitoring and battery-powered instrumentation where low analog input drive, high channel density, and autonomous conversion are critical.

For engineers reviewing the AD4697BCPZ-RL7 datasheet, AD4697BCPZ-RL7 pinout, AD4697BCPZ-RL7 application, or AD4697BCPZ-RL7 equivalent, key selection considerations include its 24-lead LFCSP package, 4.00 mm × 4.00 mm footprint, 715 ns acquisition time at 500 kSPS, internal LDO support for single 2.7–5.5 V analog supply, and compatibility with unipolar/pseudobipolar input modes across −40°C to +125°C operation.

Technical Context

The AD4697BCPZ-RL7 implements a true 16-bit SAR core with no missing codes and integrates an 8-channel low-crosstalk multiplexer, customizable channel sequencer, and overvoltage protection clamps (±5 mA per input). Its Easy Drive architecture enables analog input high-Z mode and reference input high-Z mode, eliminating need for external high-speed drivers or reference buffers in most designs.

Digital functionality includes autocycle mode with programmable sample periods (8.5–920 μs), on-chip oversampling/decimation, threshold detection with alert indicators, offset/gain correction registers, and dual-/quad-SDO SPI interface supporting 1.14–1.98 V logic levels - all optimized for low-power microcontroller host integration without pipeline latency.

Key Specifications

Pinout & Package

AD4697BCPZ-RL7 uses a 24-lead, 4.00 mm × 4.00 mm lead frame chip scale package (LFCSP) with exposed paddle for thermal management. Pin functions are validated per Analog Devices' Rev. B datasheet (pp. 13–15).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD4698BCPZ-RL7, the AD4697BCPZ-RL7 trades 2× sample rate for 2× lower power consumption at same OSR, while compared with ADS8688IPWR it offers superior noise performance (4.9 μV rms vs. 12 μV rms) and smaller footprint but lacks on-chip PGA - making it ideal for high-fidelity, space-constrained sensor front ends.

Availability

AD4697BCPZ-RL7 is available at Aetrix Electronics and suitable for photodiode monitoring, medical instrumentation, and battery-powered data loggers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD4697BCPZ-RL7 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 AD4697/AD4698 product line was engineered for space-constrained, multichannel precision data acquisition systems - emphasizing low power, high channel density, and simplified analog front-end design through Easy Drive architecture.

FAQ

What is the maximum sample rate supported by the AD4697BCPZ-RL7?

The AD4697BCPZ-RL7 supports a maximum sample rate of 500 kSPS in standard conversion mode. This is fixed per the device variant - unlike the AD4698BCPZ-RL7, which operates at 1 MSPS. The 500 kSPS rate is maintained across the full −40°C to +125°C temperature range and with all digital features (oversampling, autocycle, threshold detection) enabled. Acquisition time is 715 ns at this rate, occupying ≥71.5% of the conversion cycle.

Does the AD4697BCPZ-RL7 include an internal reference buffer?

No, the AD4697BCPZ-RL7 does not include an internal reference buffer. That feature is exclusive to the WLCSP variants (e.g., AD4697WBCPZ-RL7). The AD4697BCPZ-RL7 uses the LFCSP package and requires an external reference source connected to the REF pin. Its reference input high-Z mode reduces drive requirements, but no on-chip buffer is present - confirmed in the datasheet footnote 7 and Table 1 specifications.

What package type and dimensions does the AD4697BCPZ-RL7 use?

The AD4697BCPZ-RL7 uses a 24-lead lead frame chip scale package (LFCSP) measuring 4.00 mm × 4.00 mm with an exposed thermal pad. This package is RoHS-compliant, moisture-sensitive level 3 (MSL-3), and specified for operation from −40°C to +125°C. Pin configuration matches Analog Devices' standard LFCSP layout for the AD4697 family, with AVDD, VIO, REF, CNV, CSB, SDOx, and eight analog input pins distributed around the perimeter.

Can the AD4697BCPZ-RL7 operate from a single 3.3 V supply?

Yes, the AD4697BCPZ-RL7 can operate from a single 3.3 V supply applied to AVDD, provided the internal LDO is disabled (LDO_IN tied to AGND) and VDD is supplied at 1.71–1.89 V. Alternatively, with internal LDO enabled, AVDD may be 2.7–5.5 V while LDO_IN accepts 2.4–5.5 V - allowing flexible power architecture. The 3.3 V AVDD configuration is explicitly validated in Table 1 and supports full 16-bit performance across temperature.

How does the Easy Drive feature reduce system design complexity for the AD4697BCPZ-RL7?

The Easy Drive feature in the AD4697BCPZ-RL7 reduces system design complexity by enabling analog input high-Z mode and reference input high-Z mode - lowering required drive strength for both signal and reference paths by >90%. This allows direct connection of high-impedance sensors (e.g., photodiodes) and low-current references without external op-amps or buffers, cutting BOM cost, PCB area, and calibration effort. The feature is hardware-configurable and active by default in conversion mode.