MAX9546 データシートの表示（PDF） - Maxim Integrated

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MAX9546

Differential Video Interface Chipset

Maxim Integrated 

MAX9546/MAX9547

Differential Video Interface Chipset

Pin Description (MAX9546)

PIN

NAME

FUNCTION

1, 8

VCC

Power Supply. Connect together and bypass with a 0.1µF in parallel with a 4.7µF capacitor to GND.

2

IN

Video Input

3

FAULT

Fault Indicator. Active-low, open-drain output. FAULT = low when fault is detected at the output.

FAULT = high when no fault is detected at the output.

4, 5

GND

Ground

6

OUT- Negative Differential Output

7

OUT+ Positive Differential Output

EP

EP

Exposed Paddle. Connect to GND.

Pin Description (MAX9547)

PIN

NAME

FUNCTION

1

IN+

Positive Differential Input

2

ZT+

Positive Transconductance Terminal

3

ZT-

Negative Transconductance Terminal

4

IN-

Negative Differential Input

5

GND

Ground

6

LOS

Loss-of-Signal Indicator. Active-low, open-drain output. LOS = low when no signal is detected at the

input. LOS = high when signal is present at the input.

7

IOUT Current Output

8

VCC

Power Supply. Bypass with a 0.1µF capacitor in parallel with a 4.7µF capacitor to GND.

EP

EP

Exposed Paddle. Connect to GND.

Detailed Description

The MAX9546/MAX9547 differential interface chipset

converts single-ended voltages to differential voltages for

transport and then converts back to single-ended voltag-

es. The chipset is optimized for transporting CVBS/FBAS

analog video signals (PAL or NTSC) through hostile envi-

ronments. The MAX9546 driver includes a fault output

(FAULT) that indicates shorted transmission cables. The

MAX9547 receiver loss-of-signal output (LOS) indicates

an absence of input signal.

The MAX9546/MAX9547 operate from a 7.5V to 10V

single supply. The differential interface is immune to short-

circuit conditions to supply (VCC), or ground. These devic-

es include ±15kV ESD (Human Body Model) protection.

MAX9546

Driver

The MAX9546 driver converts a single-ended video input

into a differential output for transport across a twisted pair

of wires. The input is AC-coupled and the video signal

sync tip is clamped at 3.46V to set the voltage of the input.

The output common-mode voltage is optimized to reject

ground differences between the MAX9546 and MAX9547

up to ±2V. The differential gain is internally set to 2V/V to

drive a back-terminated output to unity gain. The maxi-

mum input resistance should not exceed 400Ω to ensure

device stability.

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