Analog Devices Inc. AD9629-20EBZ

Overview

AD9629-20EBZ from Analog Devices is a 12-bit, 20 MSPS analog-to-digital converter with 1.8 V analog supply operation, differential 700 MHz input bandwidth, and on-chip voltage reference and sample-and-hold circuit. It delivers 71.3 dBFS SNR at 9.7 MHz input and supports offset binary, gray code, or twos complement output formats for communications receiver front-ends.

For engineers reviewing the AD9629-20EBZ datasheet, AD9629-20EBZ pinout, AD9629-20EBZ application, or AD9629-20EBZ equivalent, key selection criteria include its 20 MSPS sampling rate, 1.8 V AVDD/DRVDD dual-domain power architecture, programmable clock divider (1/2/4), built-in BIST pattern generation, and LFCSP-32 RoHS-compliant package with exposed paddle thermal grounding.

Technical Context

The AD9629-20EBZ implements a multistage differential pipeline ADC architecture with output error correction logic to guarantee no missing codes over −40°C to +85°C. Its sample-and-hold maintains performance up to 200 MHz input frequency and supports 2 V p-p differential analog input with 0.9 V common-mode voltage.

A standard SPI interface enables configuration of data formatting, clock/data alignment, power-down modes, DCO timing, and voltage reference selection. The device accepts differential clock inputs compliant with CMOS/LVDS/LVPECL standards and provides programmable integer clock division (1, 2, or 4) for flexible system synchronization.

Key Specifications

Pinout & Package

The AD9629-20EBZ is housed in a 32-lead, 5 mm × 5 mm RoHS-compliant LFCSP package with an exposed paddle that must be soldered to the PCB's analog ground plane for thermal management, noise reduction, and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog-to-digital conversion applications.

Compared with AD9629-20EBZ, AD9609-20EBZ trades 2 bits of resolution for lower cost and power, while AD9649-20EBZ adds 2 bits at higher power and price-making AD9629-20EBZ the optimal balance for mid-tier communications and portable medical digitization.

Availability

AD9629-20EBZ is available at Aetrix Electronics and suitable for communications receiver design, handheld test equipment development, portable ultrasound systems, and radar signal acquisition requiring stable component supply and long-term design-in support.

Supply support for AD9629-20EBZ 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 engineering resources spanning RF, precision conversion, and power management.

The AD9629 product line delivers high-speed, low-power pipeline ADCs optimized for communications infrastructure, portable instrumentation, and medical imaging-designed to simplify system integration with integrated references, flexible I/O, and robust thermal packaging.

FAQ

What is the maximum analog input frequency supported by the AD9629-20EBZ?

The AD9629-20EBZ supports analog input frequencies up to 200 MHz while maintaining specified AC performance including 69.0 dBFS SNR. Its 700 MHz small-signal analog input bandwidth enables accurate digitization of wideband IF signals and simplifies anti-alias filter design in communications and radar applications. This specification applies directly to the AD9629-20EBZ under standard operating conditions per the Rev. B datasheet.

Does the AD9629-20EBZ require an external voltage reference?

No, the AD9629-20EBZ integrates a 1.0 V ±1.2% on-chip voltage reference with 2 mV load regulation error at 1.0 mA. External reference is optional via the VREF and SENSE pins, but not required for standard operation. The internal reference is used by default in the AD9629-20EBZ and supports full 12-bit accuracy across the industrial temperature range.

How does the AD9629-20EBZ handle clock input jitter sensitivity?

The AD9629-20EBZ features 0.1 ps rms aperture jitter, achieved through a low-noise sample-and-hold circuit and differential clock input architecture. This jitter performance ensures minimal SNR degradation at high input frequencies-e.g., 71.3 dBFS at 9.7 MHz and 69.0 dBFS at 200 MHz. The AD9629-20EBZ achieves this without requiring ultra-low-jitter external clocks, reducing system BOM cost.

Can the AD9629-20EBZ operate with a 3.3 V digital interface while using 1.8 V analog supply?

Yes, the AD9629-20EBZ supports independent analog (AVDD = 1.8 V) and digital output (DRVDD = 1.8 V to 3.3 V) supplies. When DRVDD = 3.3 V, digital outputs meet 3.3 V CMOS specifications (VOH ≥ 3.25 V at 0.5 mA, VOL ≤ 0.2 V at 1.6 mA), enabling direct connection to 3.3 V FPGAs or ASICs without level shifters-fully validated for the AD9629-20EBZ in Table 3 of the datasheet.

What is the purpose of the exposed paddle on the AD9629-20EBZ LFCSP package?

The exposed paddle on the AD9629-20EBZ is the sole ground connection for the die and must be soldered to the PCB's analog ground plane. It provides critical thermal dissipation (θJC = 3.1°C/W), reduces noise coupling, and enhances mechanical reliability. Per Figure 3 and Table 8, failure to solder the paddle results in functional failure and violates JEDEC thermal specifications for the AD9629-20EBZ.