High Speed, Triple Differential Receiver

with Comparators

AD8145

Rev. 0

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FEATURES

0.1 dB flatness out to 75 MHz

High CMRR: 69 dB @ 10 MHz

High differential input impedance: 1 MΩ

Wide input common-mode range: ± 3.8 V (±5 V supplies)

On-chip gain-setting resistors

Can be configured for gain of 1 or 2

Fast settling: 15 ns to 0.1% @ 2 V p-p

Low input referred noise: 13nV/√Hz

Disable feature

Small packaging: 32-lead, 5 mm × 5 mm LFCSP

APPLICATIONS

RGB video receivers

YPbPr video receivers

KVM (keyboard, video, mouse)

UTP (unshielded twisted pair) receivers

FUNCTIONAL BLOCK DIAGRAM

OUT_G

OUT_B

OUT_R

COMPB_IN+

COMPB_IN–

GND

GND

1

2

3

4

5

6

7

8

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

GND

REF_G

GAIN_G

IN+_G

IN–_G

REF_R

GAIN_R

GND

9

10111213141516

+

–

+

–

–

+

–

C

RR

A

B

C

C

RR

R

R

AD8145

Figure 1.

GENERAL DESCRIPTION

The AD8145 is a triple, low cost, differential-to-single-ended

receiver specifically designed for receiving red-green-blue

(RGB) video signals over twisted pair cable or differential

printed circuit board traces. It can also be used to receive any

type of analog signal or high speed data transmission. Two

auxiliary comparators with hysteresis are provided, which can

be used to decode video sync signals that are encoded on the

received common-mode voltages, to receive digital signals, or as

general-purpose comparators. The AD8145 can be used in

conjunction with the AD8133 or AD8134 triple differential

drivers to provide a complete low cost solution for RGB over

Category 5 UTP cable applications, including KVM.

The excellent common-mode rejection (69 dB @ 10 MHz) of

the AD8145 allows for the use of low cost, unshielded twisted

pair cables in noisy environments.

The AD8145 can be configured for a differential-to-single-

ended gain of 1 or 2 by connecting the GAIN pin of each

channel to its respective output (G = 1) or connecting it to a

reference voltage (G = 2), which is normally grounded.

A REF input is provided on each channel that allows designers

to level shift the output signals.

The AD8145 is available in a 5 mm × 5 mm, 32-lead LFCSP and

is rated to work over the extended industrial temperature range

of −40°C to +105°C.