AD8145

• Full featured evaluation board for the AD8143/AD8145
• Uses Cat-5 or SMA as inputs and VGA or SMA as outputs
• ±5 V operation

The AD8143 and AD8145 are triple, low cost, differential to single-ended receivers, specifically designed for receiving red, green, and blue (RGB) signals over a twisted pair cable or differential printed circuit board (PCB) traces. These products can also receive any type of analog signal or high speed data transmission. Two auxiliary comparators with hysteresis are provided on both products to decode video sync signals encoded on the received common-mode voltages. These comparators receive digital signals or can be used as general-purpose comparators.

The AD8143 and AD8145 can be used in conjunction with the AD8133 and AD8134 triple differential drivers to provide a complete, low cost solution for RGB signals over Category-5 (Cat-5) UTP cable applications, including keyboards, videos, and mouses (KVM). The excellent common-mode rejection of both the AD8143 and AD8145 allows the use of low cost, unshielded, twisted pair cables in noisy environments.

The AD8143 has a wide power supply range from single +5 V supply to ±12 V, which allows a wide common-mode range. The wide common-mode input range of the AD8143 maintains signal integrity in systems where the ground potential is a few volts different between the driver and receiver ends without using isolation transformers. The AD8143 is stable at a gain of 1. Closed-loop gain is easily set using external resistors.

The AD8145 can be configured for a differential to single-ended gain of 1 or 2 by connecting the GAIN_x pin of each channel to the respective output (gain = 1), or by connecting it to a reference voltage (gain = 2), which is normally grounded. On the AD8145, a REF_x input is provided on each channel that allows designers to level shift the output signals.

Both the AD8143 and AD8145 are available in a 5 mm × 5 mm, 32-lead LFCSP. The AD8143 is rated to work over the extended industrial temperature range of −40°C to +85°C, while the AD8145 can work over the extended industrial temperature range of −40°C to +105°C. Only the AD8145 has an automotive grade version that is qualified for use in automotive applications.