Analog Devices Inc. AD9639BCPZ-170

Overview

AD9639BCPZ-170 from Analog Devices is a quad, 12-bit, 170 MSPS analog-to-digital converter with JESD204B serial output, on-chip temperature sensor, and 780 MHz full-power analog bandwidth. It operates from a single 1.8 V supply, delivers 64.5 dB SNR at 84.3 MHz input, and supports −95 dB channel-to-channel crosstalk in radar subsystems and broadband radio receivers.

For engineers reviewing the AD9639BCPZ-170 datasheet, AD9639BCPZ-170 pinout, AD9639BCPZ-170 application, or AD9639BCPZ-170 equivalent, this page provides verified specifications, validated pin functions, confirmed thermal and timing behavior, and real-world use context for high-speed digitization in communication infrastructure and test equipment.

Technical Context

The AD9639BCPZ-170 implements a pipelined switched-capacitor ADC architecture with digital correction logic, sampling on the rising clock edge and delivering 12-bit results via CML serial outputs encoded per JESD204B. Its internal duty cycle stabilizer (DCS) retimes nonsampling edges to maintain 50% internal clock duty cycle across wide input duty cycle ranges.

Each of the four independent ADC channels features differential analog inputs (VIN±A–D), programmable common-mode voltage references (VCM A–D), and dedicated CML output pairs (DOUT±A–D). The device integrates an on-chip PLL for clock multiplication and a temperature-sensing output (TEMPOUT) with −1.12 mV/°C sensitivity and 739 mV baseline at 25°C.

Key Specifications

Pinout & Package

The AD9639BCPZ-170 is housed in a Pb-free/RoHS-compliant 72-lead LFCSP package (CP-72-3) with exposed paddle soldered to PCB ground plane for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad, 12-bit, JESD204B ADC applications.

Compared with AD9639BCPZ-170, AD9637BCPZ-170 increases PCB area and interconnect count while reducing integration benefits, whereas ADS42JB69IRGCT trades higher power and external support components for marginal speed/SFDR gains-neither offers the same balance of quad integration, thermal awareness, and clock flexibility.

Availability

AD9639BCPZ-170 is available at Aetrix Electronics and suitable for radar subsystems, cable head-end equipment, and wireless infrastructure transceivers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AD9639BCPZ-170 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 DSP technologies, serving precision instrumentation, communications, and industrial markets since 1965.

The AD9639 belongs to Analog Devices' high-speed data converter product line, designed specifically for wideband digitization in communication infrastructure, defense electronics, and automated test equipment where channel density, thermal stability, and JESD204B interoperability are critical.

FAQ

What is the maximum analog input frequency supported by the AD9639BCPZ-170?

The AD9639BCPZ-170 supports a full-power analog bandwidth of 780 MHz, meaning it can accurately digitize signals up to that frequency without significant amplitude roll-off. This enables direct RF sampling in second and third Nyquist zones, such as 400–700 MHz cellular bands or S-band radar IFs. Performance metrics like SNR and SFDR are specified up to 240.3 MHz, but usable bandwidth extends to 780 MHz per the AC specifications table.

Does the AD9639BCPZ-170 require external voltage references?

No, the AD9639BCPZ-170 includes an on-chip reference that eliminates the need for external decoupling or reference buffers. The internal reference is adjustable via SPI control (register 0x18) and supports input voltage ranges from 1.0 V p-p to 1.5 V p-p. This simplifies system design and improves layout robustness compared to external reference solutions that introduce noise coupling paths.

How does the duty cycle stabilizer (DCS) function in the AD9639BCPZ-170?

The AD9639BCPZ-170's DCS retimes the nonsampling clock edge to produce an internal 50% duty cycle signal, allowing high dynamic performance even with input clock duty cycles ranging from 30% to 70%. This feature removes the need for external clock conditioners in systems using legacy oscillators or dividers. DCS is enabled by default and should remain active unless specific low-jitter clock sources guarantee tight duty cycle control.

What is the purpose of the TEMPOUT pin on the AD9639BCPZ-170?

The TEMPOUT pin on the AD9639BCPZ-170 provides an analog voltage output proportional to die temperature (−1.12 mV/°C, 739 mV at 25°C), enabling real-time thermal monitoring without external sensors. This output is used for system-level thermal compensation, overtemperature shutdown, and calibration drift correction. Its accuracy supports ±2°C measurement across the −40°C to +85°C operating range.

Can the AD9639BCPZ-170 operate with a single-ended clock input?

Yes, the AD9639BCPZ-170 supports single-ended CMOS clock inputs: drive CLK+ directly from a CMOS gate and terminate CLK− to ground via a 0.1 µF capacitor in parallel with a 39 kΩ resistor. While differential clocking is preferred for lowest jitter, this configuration maintains functional operation at 170 MSPS. However, SNR degrades by ~1–2 dB compared to differential LVDS or LVPECL drive due to reduced common-mode rejection.