Rainbow-electronics MAX4885 Manual do Utilizador descarregar pdf (Página 8)

MAX4885

Complete VGA 1:2 or 2:1 Multiplexer

8 _______________________________________________________________________________________

Timing Circuits/Timing Diagrams (continued)

MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.

OFF-ISOLATION IS MEASURED BETWEEN R0 AND R1 OR R2 ON EACH SWITCH.

ON-LOSS IS MEASURED BETWEEN R0 AND R1 OR R2 ON EACH SWITCH.

CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL.

SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.

+5V

OUT

V+

SEL

MAX4885

OFF-ISOLATION = 20log ✕

OUT

ON-LOSS = 20log ✕

OUT

CROSSTALK = 20log ✕

OUT

NETWORK

ANALYZER

50Ω

50Ω 50Ω

50Ω

MEAS REF

10nF

0V OR V+

50Ω

GND

R0, G0, B0

R2, G2, B2

R1, G1, B1

Figure 4. On-Loss, Off-Isolation, and Crosstalk

Pin Description

PIN NAME FUNCTION

1 QP

Charge-Pump Enable, Active Low. Drive QP low for normal operation. Drive QP high to disable the

internal charge pump.

2R0RGB Analog I/O

3G0RGB Analog I/O

4B0RGB Analog I/O

5H0Horizontal Sync I/O

6V0Vertical Sync I/O

7 DDCA0 DDC I/O

8 DDCB0 DDC I/O

9 EN

Enable Input, Active Low. Drive EN low for normal operation. Drive EN high to disable the device. All

I/Os are high-impedance and charge pump is off when the device is disabled.

10 V

DDC Clamp Voltage. Open-drain DDCA_ and DDCB_ outputs are clamped to one diode-drop below

. +2.7V < V

< V+. Connect V

to +3.3V for voltage clamping, or connect to V+ to disable

clamping. Bypass V

to GND with a 0.1µF or larger ceramic capacitor.

11, 21, 30

V+ Supply Voltage. V+ = +5.0V ± 10%. Bypass each to GND with a 0.1µF or larger ceramic capacitor.

12, 20, 29

GND Ground

13 DDCA2 DDC I/O

14 DDCB2 DDC I/O

15 R2 RGB Analog I/O

16 G2 RGB Analog I/O

17 B2 RGB Analog I/O

1 2 3 4 5 6 7 8 9 10 11 12 13

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