Analog Devices Inc. AD9432BSQ-80

Overview

AD9432BSQ-80 from Analog Devices is a 12-bit, 80 MSPS monolithic pipeline analog-to-digital converter with on-chip track-and-hold, 500 MHz analog bandwidth, and 2.0 V p-p differential input range. It operates from a single 5.0 V analog supply and 3.3 V digital supply, delivering 67 dB SNR at 49 MHz input frequency, and is used in zero-IF base station receivers and HDTV broadcast camera digitization chains.

For engineers reviewing the AD9432BSQ-80 datasheet, AD9432BSQ-80 pinout, AD9432BSQ-80 application, or AD9432BSQ-80 equivalent, key selection criteria include sampling rate headroom (80 vs. 105 MSPS variants), thermal performance in LQFP package, out-of-range flag behavior, and compatibility with 3.3 V CMOS/TTL logic interfaces.

Technical Context

The AD9432BSQ-80 implements a switched-capacitor pipeline architecture with on-chip reference and input buffer, enabling full 12-bit resolution without external support components. Its differential encode interface accepts TTL/CMOS-level signals, and aperture jitter is specified at 0.25 ps rms - critical for wideband IF sampling fidelity.

It features latched 12-bit twos-complement outputs with 10-cycle pipeline latency, out-of-range (OR) flag assertion synchronized to data output timing, and supports both internal (2.5 V ±50 ppm/°C) and external reference configurations. The analog input stage is self-biased to 3.0 V common-mode voltage and optimized for transformer- or op-amp-driven differential sources.

Key Specifications

Pinout & Package

AD9432BSQ-80 is housed in a 52-lead low-profile quad flat package (LQFP), with exposed paddle not present (distinct from TQFP_EP variant). Pin functions are validated per Rev. F datasheet Figure 3 and Table 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed ADC applications.

Compared with AD9432BSV-80 and AD9235BCPZ-80, AD9432BSQ-80 offers best-in-class integration (on-chip reference, buffer, OR flag) in a standard LQFP footprint - ideal for rapid prototyping and legacy-compatible PCB upgrades without thermal pad redesign.

Availability

AD9432BSQ-80 is available at Aetrix Electronics and suitable for base station receiver digitization, zero-IF wireless local loop (WLL) systems, and HDTV broadcast camera signal chains requiring stable component supply across extended production lifecycles.

Supply support for AD9432BSQ-80 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, headquartered in Norwood, MA.

The AD9432 product line delivers monolithic high-speed ADCs optimized for communications infrastructure - designed specifically for zero-IF, WLL, LMDS, and broadcast video digitization with integrated reference and input conditioning.

FAQ

What is the maximum analog input frequency supported by the AD9432BSQ-80 before aliasing occurs?

The AD9432BSQ-80 has a 500 MHz analog bandwidth and supports sampling up to 80 MSPS, yielding a Nyquist frequency of 40 MHz. Signals above 40 MHz will alias into the first Nyquist zone unless filtered. Its 500 MHz bandwidth ensures minimal amplitude roll-off and phase distortion for IF inputs up to 40 MHz, making AD9432BSQ-80 suitable for direct IF sampling in WLL and LMDS receivers without additional anti-alias filtering beyond standard SAW filters.

Does the AD9432BSQ-80 require an external reference voltage, or can it operate using its internal reference?

The AD9432BSQ-80 can operate using its internal 2.5 V reference (VREFOUT) by connecting Pin 45 (VREFIN) to Pin 46 (VREFOUT) and bypassing with a 0.1 µF capacitor. This configuration eliminates external reference components and is validated for full 12-bit performance. External references may be used to adjust full-scale range ±5%, but AD9432BSQ-80's internal reference provides 50 ppm/°C tempco and is sufficient for most base station and broadcast applications.

How does the out-of-range (OR) flag behave during sustained overrange conditions on the AD9432BSQ-80?

During sustained overrange, the OR flag on AD9432BSQ-80 remains asserted high for every clock cycle where the output code equals +2047 or −2048. It is pipeline-synchronous with the data outputs - same 10-cycle latency and propagation delay - and deasserts only when the next valid sample falls within the 2.0 V p-p range. The output codes do not wrap; they saturate at full scale while OR is high, enabling precise clipping detection in AGC and monitoring circuits.

Can the AD9432BSQ-80 accept single-ended encode clock inputs, or is differential operation mandatory?

The AD9432BSQ-80 supports both differential and single-ended encode clock inputs. Differential mode (ENCODE/ENCODE pins) is recommended for lowest jitter and highest dynamic performance, but single-ended operation is functional: drive ENCODE with TTL/CMOS logic (VIHS ≥ 2.0 V, VILS ≤ 0.8 V) and tie ENCODE to a 1.6 V bias. However, single-ended use increases sensitivity to power supply noise and degrades SNR by ~1–2 dB compared to differential - a trade-off validated in AD9432BSQ-80 characterization data.

What is the thermal resistance (θJA) of the AD9432BSQ-80 in its LQFP package, and how does it compare to the TQFP_EP variant?

The AD9432BSQ-80 in 52-lead LQFP has a simulated θJA of 50°C/W on a 4-layer JEDEC board with no airflow. In contrast, the AD9432BSV-80 (TQFP_EP) achieves 16°C/W with 1.0 m/s airflow due to its exposed thermal pad. This 3× improvement allows AD9432BSV-80 to sustain full 850 mW dissipation at higher ambient temperatures. For thermally constrained designs, AD9432BSQ-80 requires careful copper pour and via placement beneath the package to approach its datasheet θJA rating.