Overview
The AD8128ACPZ-R7, produced by Analog Devices Inc., is a high-speed, low-noise analog line equalizer designed to compensate for transmission losses in unshielded twisted pair (UTP) CAT-5/CAT-5e cables. This device is particularly useful in applications requiring signal integrity over medium to long cable lengths, such as keyboard-video-mouse (KVM) systems and RGB video over UTP cable receivers. The AD8128 can operate as a standalone receiver/equalizer or in conjunction with other devices like the AD8143 to provide a complete solution for receiving RGB signals over UTP cables.
Key Specifications
| Parameter | Rating/Value |
|---|---|
| Package Type | 8-Lead Lead Frame Chip Scale Package (LFCSP) |
| Operating Temperature Range | −40°C to +85°C |
| Supply Voltage Range | ±4.5 V to ±5.5 V |
| Quiescent Supply Current (ICC/IEE) at ±5 V | +24/−21 mA to +31/−27 mA |
| Output Voltage Swing | −2.55 V to +2.7 V |
| Output Offset Voltage (VOFFSET = 0 V, RTO) | −10.9 mV to +18.7 mV |
| Output Offset Voltage Drift | −5.5 µV/°C |
| Short-Circuit Output Current | 100 mA |
| Power Supply Rejection Ratio (PSRR) RTO | −48 dB to −61 dB |
| Equalized Bandwidth for 100 meters of Cable | Up to 120 MHz |
| Integrated Output Noise at 100 meters | 1.5 mV rms |
Key Features
- High-speed, low-noise analog line equalizer for UTP CAT-5/CAT-5e cables.
- Three control pins (VPEAK, VGAIN, VOFFSET) for optimal cable compensation.
- Adjustable broadband gain from 0 dB to 3 dB and high frequency peaking from 0 dB to 20 dB.
- Low integrated output noise and adjustable output offset voltage.
- Capable of compensating up to 100 meters of cable; two devices can be cascaded for up to 200 meters.
- High impedance differential input and low impedance output capable of driving a 150 Ω load resistor and up to 20 pF of load capacitance.
Applications
- Keyboard-video-mouse (KVM) systems.
- RGB video over unshielded twisted pair (UTP) cable receivers.
- Professional video projection and distribution.
- Security video systems.
Q & A
- What is the primary function of the AD8128ACPZ-R7? The AD8128ACPZ-R7 is a high-speed, low-noise analog line equalizer designed to compensate for transmission losses in UTP CAT-5/CAT-5e cables.
- What are the key control pins on the AD8128ACPZ-R7? The key control pins are VPEAK, VGAIN, and VOFFSET, which adjust high frequency peaking, broadband gain, and output offset voltage, respectively.
- What is the maximum equalized cable length for a single AD8128 device? A single AD8128 device can compensate for up to 100 meters of CAT-5/CAT-5e cable.
- How can longer cable lengths be compensated for? For cable lengths longer than 100 meters, two AD8128 devices can be cascaded to compensate for up to 200 meters of CAT-5/CAT-5e cable.
- What is the operating temperature range of the AD8128ACPZ-R7? The operating temperature range is −40°C to +85°C.
- What is the typical output noise of the AD8128 at 100 meters of cable length? The typical output noise is 1.5 mV rms.
- Can the AD8128 be used in dc-coupled systems? Yes, the AD8128 is suitable for dc-coupled wideband RGB-over-CAT-5 applications with adjustable output offset voltage.
- What are some common applications of the AD8128ACPZ-R7? Common applications include KVM systems, RGB video over UTP cable receivers, professional video projection and distribution, and security video systems.
- What is the package type of the AD8128ACPZ-R7? The package type is an 8-Lead Lead Frame Chip Scale Package (LFCSP).
- Is the AD8128ACPZ-R7 RoHS compliant? Yes, the AD8128ACPZ-R7 is RoHS compliant.
