Analog Devices Inc. AD8197BASTZ

Overview

AD8197BASTZ from Analog Devices is a 4:1 HDMI/DVI switch IC with integrated input equalization and output pre-emphasis, designed for high-speed TMDS signal routing in HDMI 1.3-compliant receivers. It supports data rates up to 2.25 Gbps, pixel clocks from 25 MHz to 225 MHz, and operates over −40°C to +85°C in a 100-lead LQFP package. It enables long-cable operation (20 m at 2.25 Gbps) and HDCP compatibility in A/V receivers and HDTV sets.

For engineers reviewing the AD8197BASTZ datasheet, AD8197BASTZ pinout, AD8197BASTZ application, or AD8197BASTZ equivalent, key selection criteria include TMDS channel count (4 × 4), equalization level (6 dB or 12 dB), pre-emphasis control (4 settings), on-chip 50 Ω terminations per TMDS pair, and dual I²C/parallel interface support for source switching and power management.

Technical Context

The AD8197BASTZ implements a fully buffered, unidirectional 4-input/1-output TMDS switch core with per-channel input termination control and programmable receive equalization (6 dB or 12 dB boost at 825 MHz). Its auxiliary switch routes four bidirectional low-speed channels-including DDC bus and two additional signals-enabling single-chip HDMI 1.3 receiver compliance.

It features dual control interfaces: an I²C slave interface (with 8 configurable addresses) for full register access-including RX termination, EQ, TX pre-emphasis, and output enable-and a parallel interface supporting basic channel selection and output control, though lacking input termination programming capability.

Key Specifications

Pinout & Package

AD8197BASTZ is housed in a 100-lead, 14 mm × 14 mm Pb-free LQFP package with exposed thermal pad (θ_JA = 56°C/W, θ_JC = 19°C/W). Pin 1 is marked by corner notch; AVCC, AVEE, DVCC, DVEE, VTTI, VTTO, and AMUXVCC supply pins are distributed across all four sides for optimal decoupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar HDMI/DVI switching applications.

Compared with AD8197ASTZ and TPD12S016RGER, AD8197BASTZ uniquely delivers full 2.25 Gbps switching with programmable 12 dB equalization and 6 dB pre-emphasis-enabling robust 1080p deep-color transport over 20 m cables where alternatives fail or require supplemental signal conditioning.

Availability

AD8197BASTZ is available at Aetrix Electronics and suitable for HDMI switching, A/V receiver design, and HDTV set development requiring stable component supply, long-cable signal integrity, and HDMI 1.3 compliance.

Supply support for AD8197BASTZ 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision signal chain applications.

The AD8197BASTZ belongs to Analog Devices' high-speed video interface product line, engineered specifically for HDMI/DVI signal routing with integrated equalization and pre-emphasis to solve long-cable and multi-source interoperability challenges in consumer and professional A/V systems.

FAQ

What is the maximum HDMI data rate supported by the AD8197BASTZ?

The AD8197BASTZ supports a maximum data rate of 2.25 Gbps per TMDS channel, enabling 1080p deep-color (12-bit) HDMI formats and DVI resolutions exceeding UXGA (1600 × 1200). This rating is validated per HDMI 1.3 and DVI 1.0 specifications with added jitter ≤25 ps (p-p) at full rate. The AD8197BASTZ maintains compliance under worst-case conditions including 20 m of 24 AWG cable and temperature extremes from −40°C to +85°C.

Does the AD8197BASTZ support HDCP passthrough?

Yes, the AD8197BASTZ is explicitly designed for HDMI 1.3-compliant receiver applications and supports full HDCP 1.3 passthrough. Its auxiliary switch routes the entire DDC bus (including SCL/SDA) plus two additional bidirectional signals, preserving the HDCP authentication handshake between source and sink without interruption. The AD8197BASTZ does not decrypt or modify HDCP content - it acts as a transparent, timing-aware conduit.

How is input equalization configured on the AD8197BASTZ?

Input equalization on the AD8197BASTZ is configured via I²C register writes to the Receive Equalizer Register 1 and Register 2, selecting either 6 dB or 12 dB boost at 825 MHz per TMDS input pair. Alternatively, the PP_EQ pin (pin 77) provides global parallel control: logic high selects 12 dB, logic low selects 6 dB. The AD8197BASTZ does not auto-detect cable length or signal loss - equalization must be manually set based on system layout and cabling.

Can the AD8197BASTZ be used in a wire-OR configuration?

Yes, the AD8197BASTZ supports wire-OR configurations via its output disable feature. Programming the HS_EN bit (in High Speed Device Modes Register) or asserting PP_EN (pin 76) places all TMDS outputs (OP0–ON3) into high-impedance state. This allows multiple AD8197BASTZ devices to share a common output bus - essential for building larger switching matrices or dual-link HDMI systems without external isolation logic.

What power supplies are required for proper operation of the AD8197BASTZ?

The AD8197BASTZ requires five independent supplies: AVCC and DVCC at 3.3 V (3.0–3.6 V), VTTI and VTTO at 3.3 V (for TMDS termination), and AMUXVCC at 5 V (for auxiliary mux logic). AVEE and DVEE are ground references (0 V). All supplies must be locally decoupled with 100 nF ceramic capacitors; improper sequencing or insufficient decoupling causes increased jitter or register corruption. The AD8197BASTZ draws 110 mA typical (max 122 mA) from AVCC when outputs are enabled with maximum pre-emphasis.