Overview
The AD8148ACPZ-RL is a triple differential driver designed by Analog Devices Inc. for high-resolution video and high-speed data transmission. This component is part of the AD8146/AD8147/AD8148 family, each with specific features tailored for different applications. The AD8148 is particularly noted for its fixed gain of 4, making it suitable for driving differential signals over long distances, such as in video transmission and networking applications.
Manufactured using Analog Devices' second-generation XFCB bipolar process, the AD8148 offers high slew rates and large signal bandwidths, ensuring minimal distortion and high fidelity in signal transmission. The device is available in a compact 24-lead Lead Frame Chip Scale Package (LFCSP), making it ideal for space-constrained designs.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Slew Rate | VOCM = −1 V to +1 V, 25% to 75% | 800 | 1000 | - | V/μs |
| Fixed Gain | - | - | 4 | - | V/V |
| Supply Voltage Range | - | +4.5 | ±5.5 | - | V |
| Quiescent Current (Positive Supply) | - | 62.5 | - | mA | |
| Operating Temperature Range | - | −40 | +85 | °C | |
| Differential Input Resistance | - | 1.0 | - | kΩ | |
| Differential Output Bandwidth (−3 dB) | VO = 2 V p-p | 620 | - | MHz | |
| Output Voltage Swing (Each Single-Ended Output) | - | - | - | V |
Key Features
- Differential or Single-Ended Input to Differential Output: The AD8148 can handle both differential and single-ended inputs, converting them to differential outputs, which is crucial for maintaining signal integrity over long transmission lines.
- Fixed Gain of 4: This feature makes the AD8148 particularly suited for applications requiring a specific gain level, such as in video transmission systems.
- Internal Common-Mode Feedback Network: This network ensures output amplitude and phase matching, reducing even-order harmonics and minimizing radiated electromagnetic interference (EMI).
- Sync-on Common-Mode Encoding: The AD8148 encodes vertical and horizontal sync signals on the common-mode voltages of the outputs, which is useful in video transmission applications.
- Output Pull-Down Feature: Allows for line isolation by setting outputs to low voltage states, useful in applications requiring signal isolation.
- Low Power Consumption: The device operates with a quiescent current of 62.5 mA at 5 V, making it energy-efficient.
- Wide Supply Voltage Range: The AD8148 can operate with supply voltages ranging from +4.5 V to ±5.5 V, providing flexibility in system design.
Applications
- QXGA or 1080p Video Transmission: The AD8148 is suitable for high-resolution video transmission, ensuring clear and distortion-free video signals.
- KVM Networking: It can be used in keyboard, video, and mouse (KVM) networking applications where high-speed data transmission is required.
- Video over Unshielded Twisted Pair (UTP): The device can drive one or two 100 Ω UTP cables, making it ideal for video transmission over UTP cables.
- Differential Signal Multiplexing: The AD8148 can be used in applications requiring the multiplexing of differential signals.
Q & A
- What is the fixed gain of the AD8148?
The fixed gain of the AD8148 is 4.
- What is the slew rate of the AD8148?
The slew rate of the AD8148 is up to 1000 V/μs.
- What is the operating temperature range of the AD8148?
The operating temperature range is from −40°C to +85°C.
- What is the quiescent current of the AD8148 at 5 V?
The quiescent current is 62.5 mA.
- Can the AD8148 drive UTP cables?
Yes, the AD8148 can drive one or two 100 Ω UTP cables.
- What is the common-mode feedback feature of the AD8148?
The AD8148 has an internal common-mode feedback network that ensures output amplitude and phase matching, reducing EMI.
- Does the AD8148 support sync-on common-mode encoding?
Yes, the AD8148 encodes vertical and horizontal sync signals on the common-mode voltages of the outputs.
- What is the output pull-down feature of the AD8148?
The output pull-down feature allows for line isolation by setting outputs to low voltage states.
- What is the package type of the AD8148?
The AD8148 is available in a 24-lead Lead Frame Chip Scale Package (LFCSP).
- What are some typical applications of the AD8148?
Typical applications include QXGA or 1080p video transmission, KVM networking, video over UTP, and differential signal multiplexing.
