Overview
The AD8195ACPZ from Analog Devices Inc. is an advanced HDMI/DVI buffer designed to enhance signal integrity in systems requiring long cable runs. This device is compliant with HDMI 1.3a standards and supports data rates up to 2.25 Gbps. It features equalized TMDS inputs and preemphasized TMDS outputs, making it ideal for applications such as front panel buffers in advanced television (HDTV) sets. The AD8195 also includes bidirectional buffering for the DDC bus and CEC line, ensuring continuous functionality even when the system is powered off.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Maximum Data Rate (TMDS Dynamic Performance) | - | - | 2.25 Gbps | - |
| Bit Error Rate (BER) | - | - | 10-9 | - |
| Added Data Jitter | - | - | 31 ps p-p | - |
| Added Clock Jitter | - | - | 1 ps rms | - |
| Differential Intrapair Skew at Output | - | - | 1 ps | - |
| Operating Temperature | -40°C | - | 85°C | - |
| Package Style | - | - | 40-lead LFCSP-VQ (6 mm × 6 mm) | - |
| Supply Voltage | 3 V | - | 5.5 V | - |
Key Features
- Equalized TMDS inputs for operation with long HDMI cables (up to 20 meters at 2.25 Gbps)
- Preemphasized TMDS outputs for driving high loss output cables
- Fully buffered unidirectional inputs/outputs with 50 Ω on-chip terminations
- Low added jitter and transmitter disable feature to reduce power dissipation
- Bidirectional buffered DDC lines (SDA and SCL) and CEC line with integrated pull-up resistors (27 kΩ)
- Independently powered from 5 V of HDMI input connector
- Logic level translation (3.3 V, 5 V) and input/output capacitance isolation
- Compliant with HDMI, DVI, HDCP, DDC, and CEC standards
Applications
The AD8195ACPZ is primarily used as a front panel buffer in advanced television (HDTV) sets and other systems that require reliable transmission over long HDMI/DVI cable runs. It is also suitable for any application needing to maintain signal integrity in high-speed video transmission.
Q & A
- What is the maximum data rate supported by the AD8195ACPZ?
The AD8195ACPZ supports data rates up to 2.25 Gbps. - What is the purpose of the equalized TMDS inputs in the AD8195ACPZ?
The equalized TMDS inputs are designed to support operation with long HDMI cables, up to 20 meters at 2.25 Gbps. - What is the effect of the preemphasized TMDS outputs?
The preemphasized TMDS outputs help in driving high loss output cables, ensuring signal integrity over long cable runs. - How does the transmitter disable feature benefit the AD8195ACPZ?
The transmitter disable feature reduces power dissipation by disabling input termination when not in use. - What types of buffering does the AD8195ACPZ provide for the DDC and CEC lines?
The AD8195ACPZ provides bidirectional buffering for the DDC bus and bidirectional buffering with integrated pull-up resistors for the CEC line. - What is the operating temperature range of the AD8195ACPZ?
The operating temperature range is from -40°C to +85°C. - What package style does the AD8195ACPZ come in?
The AD8195ACPZ comes in a 40-lead LFCSP-VQ package (6 mm × 6 mm). - Is the AD8195ACPZ compliant with any specific standards?
Yes, it is compliant with HDMI, DVI, HDCP, DDC, and CEC standards. - How does the logic level translation feature work in the AD8195ACPZ?
The AD8195ACPZ supports logic level translation between 3.3 V and 5 V. - What is the significance of input/output capacitance isolation in the AD8195ACPZ?
The input/output capacitance isolation helps in reducing capacitive loading and ensuring signal integrity.
