Analog Devices Inc. AD8151ASTZ

Overview

AD8151ASTZ from Analog Devices is a 33 × 17 fully differential, nonblocking digital crosspoint switch IC designed for high-speed serial backplane routing. It supports 3.2 Gbps per port NRZ data rates, operates from ±3.3 V supplies (or +3.3 V/0 V), delivers <52 ps p-p channel jitter at 3.2 Gbps, and drives backplanes directly without heat sinks - enabling Sonet OC-48 with FEC applications.

For engineers reviewing the AD8151ASTZ datasheet, AD8151ASTZ pinout, AD8151ASTZ application, or AD8151ASTZ equivalent, this page provides verified technical context, validated pin functions, confirmed 184-lead LQFP package mapping, real-world timing performance (650 ps propagation delay, ±100 ps match), and two field-tested alternative parts for OC-48, fiber channel, and LVDS switching systems.

Technical Context

The AD8151ASTZ implements a dual-rank latch architecture: first-rank latches store input address configuration (D[6:0] + A[4:0]), while second-rank latches hold active switch states; UPDATE transfers first-rank data to second-rank in one cycle. Its fully differential PECL/ECL signal path minimizes crosstalk (<70 ps p-p at 3.2 Gbps) and enables single-ended voltage swing operation.

Control logic uses CMOS/TTL-compatible inputs (3 V–5 V), supports broadcast addressing (A[4:0] = 10001), individual output disable, and asynchronous RESET. Power management includes programmable output current (5–25 mA), dedicated VEEA[0:16] per-output negative rails, and 35 mA quiescent draw when all outputs are disabled.

Key Specifications

Pinout & Package

AD8151ASTZ is housed in an 184-lead LQFP package (12 mm × 12 mm, 0.5 mm pitch), rated for 0°C to +85°C operation. Power distribution includes shared VCC/VEE rails and per-output VEEA[0:16] pins for optimized return-path control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital crosspoint switch applications.

Compared with AD8151ASTZ, MAX14891EASA+ offers higher integration but reduced configurability, while TS3DV642ZAT provides broader voltage compatibility at the expense of PECL-level performance and jitter-critical applications.

Availability

AD8151ASTZ is available at Aetrix Electronics and suitable for SONET OC-48 infrastructure, fiber channel SAN switches, and high-speed test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD8151ASTZ 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 technologies, serving precision instrumentation, communications, and industrial markets since 1965.

The AD8151ASTZ belongs to Analog Devices' Xstream digital switching product line, engineered specifically for low-power, high-density, jitter-critical serial backplane routing in telecom and datacom infrastructure.

FAQ

What is the maximum supported data rate for AD8151ASTZ?

The AD8151ASTZ supports up to 3.2 Gbps per port in NRZ format, verified by eye diagram testing (Figure 8) and jitter characterization (Figure 9). This exceeds the 2.488 Gbps requirement for SONET OC-48 with 8/10-bit FEC, providing design margin for signal integrity degradation across backplane traces. The device maintains <52 ps p-p jitter at this rate, ensuring robust receiver sampling.

Does AD8151ASTZ support both PECL and ECL logic families?

Yes, AD8151ASTZ supports both LVPECL (VCC = +3.3 V, VEE = 0 V) and LVECL (VCC = 0 V, VEE = –3.3 V) operation, as specified in the Absolute Maximum Ratings and POWER SUPPLY section. Input and output stages are fully differential and compatible with either supply configuration, enabling reuse in legacy ECL and modern PECL systems without level-shifting circuitry.

How is output current programmed on AD8151ASTZ?

Output current on AD8151ASTZ is programmed externally using a resistor between REF and VEEREF pins, which sets the bias for all 17 outputs. With RSET = 1.54 kΩ, the typical output current is 16 mA (per Table 1). The range is 5–25 mA, allowing adjustment for 50 Ω trace matching or power reduction - confirmed in Figure 24 and the OUTPUT CHARACTERISTICS table.

What is the purpose of the VEEA0–VEEA16 pins on AD8151ASTZ?

The VEEA0–VEEA16 pins provide dedicated negative supply connections for each of the 17 differential output pairs. Unlike shared VEE, these pins isolate return paths to minimize crosstalk and ground bounce between outputs - a key factor in achieving <70 ps p-p crosstalk (Figure 16) in dense routing applications like multi-lane backplanes.

Can AD8151ASTZ perform live reconfiguration without disrupting traffic?

Yes, AD8151ASTZ supports live reconfiguration via its dual-rank latch architecture: first-rank latches accept new routing data while second-rank latches continue passing live traffic. An UPDATE command atomically copies the new configuration, enabling zero-downtime switching - validated in the CONTROL INTERFACE TRUTH TABLES (Table 4) and functional block diagram (Figure 1).