Analog Devices Inc. AD8197AASTZ-RL

Overview

AD8197AASTZ-RL 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) in HDTV set-top boxes and A/V receivers.

For engineers reviewing the AD8197AASTZ-RL datasheet, AD8197AASTZ-RL pinout, AD8197AASTZ-RL application, or AD8197AASTZ-RL equivalent, key selection considerations include TMDS channel count (4 × 4), equalization level (6 dB or 12 dB), pre-emphasis control (4 settings), auxiliary DDC switching capability, and dual-link scalability using two devices.

Technical Context

The AD8197AASTZ-RL implements a fully buffered, unidirectional high-speed switch core with on-chip 50 Ω input termination (VTTI-referenced) and user-selectable output termination (VTTO-referenced). Its equalized inputs use programmable 6 dB/12 dB high-frequency boost at 825 MHz, while outputs support four pre-emphasis levels up to 6 dB at the same frequency.

It integrates parallel (PP_CH[1:0], PP_EN, PP_EQ, PP_PRE[1:0]) and I²C slave (7-bit address configurable via I2C_ADDR[2:0]) control interfaces, with serial register writes overriding parallel settings. The auxiliary switch routes four bidirectional low-speed channels per link-including DDC bus and two additional signals-using passive 100 Ω R_ON, 8 pF C_ON switches compatible with standard I²C timing.

Key Specifications

Pinout & Package

AD8197AASTZ-RL 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; package meets JEDEC MS-026 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8191ASTZ-RL, AD8197AASTZ-RL adds critical equalization and pre-emphasis for long-cable reliability, while TI TPD12S016RGER serves a complementary ESD protection role but provides no switching or signal conditioning - making AD8197AASTZ-RL uniquely suited for high-performance, multi-source HDMI receiver front-ends.

Availability

AD8197AASTZ-RL is available at Aetrix Electronics and suitable for home theater receivers, professional projectors, HDTV set-top boxes, and digital signage controllers requiring stable component supply, long-cable HDMI signal integrity, and HDMI 1.3 compliance.

Supply support for AD8197AASTZ-RL 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 AD8197AASTZ-RL belongs to Analog Devices' high-speed video interface product line, engineered specifically for HDMI/DVI receiver front-ends in consumer and professional A/V systems demanding robust signal conditioning and flexible control.

FAQ

What is the maximum supported data rate for AD8197AASTZ-RL?

The AD8197AASTZ-RL supports a maximum data rate of 2.25 Gbps per TMDS channel, enabling 1080p deep color (12-bit) HDMI formats and resolutions exceeding UXGA (1600×1200) in DVI mode. This rating is validated under specified conditions: PRBS 2⁷−1 pattern, 27°C ambient, and proper termination per the datasheet.

Does AD8197AASTZ-RL support HDMI 1.3 compliance?

Yes, AD8197AASTZ-RL is explicitly designed as an HDMI 1.3-compliant receiver switch. It meets the transmitter and receiver eye diagram masks defined in HDMI 1.3, supports HDCP, and includes auxiliary channel routing for DDC bus and two additional signals - fulfilling all key requirements for single-chip HDMI 1.3 receive solutions.

How does the input equalization function in AD8197AASTZ-RL?

The AD8197AASTZ-RL provides programmable input equalization with two fixed boost levels: 6 dB or 12 dB at 825 MHz. Equalization can be configured globally via the PP_EQ pin or per-channel via I²C registers. At 12 dB, it compensates for attenuation in up to 20 meters of 24 AWG HDMI cable at 2.25 Gbps, restoring signal integrity at the receiver input.

Can AD8197AASTZ-RL be used in dual-link HDMI configurations?

Yes, the AD8197AASTZ-RL supports dual-link HDMI/DVI operation: two AD8197AASTZ-RL devices can be synchronized to handle eight high-speed TMDS channels (4 per device), enabling higher bandwidth applications such as WQXGA or dual-stream 1080p. The device includes dedicated control lines (PP_CH, PP_EN) for coordinated switching across multiple units.

What auxiliary signals does AD8197AASTZ-RL route, and how are they implemented?

The AD8197AASTZ-RL routes four auxiliary channels per link (AUX_A–AUX_D and AUX_COM), supporting DDC bus (SCL/SDA), HPD, and one additional signal. These are implemented as passive, bidirectional, 5 V-tolerant switches with 100 Ω R_ON and 8 pF C_ON, preserving I²C timing and voltage levels without buffering or level shifting.