MAX4885 Maxim, MAX4885 Datasheet - Page 8

• Manufacturer Part Number: MAX4885
• Description: The MAX4885 integrates high-bandwidth analog switches and level translating buffers to implement a complete 1:2 or 2:1 multiplexer for VGA signals
• Manufacturer: Maxim

Complete VGA 1:2 or 2:1 Multiplexer
Figure 4. On-Loss, Off-Isolation, and Crosstalk
8
11, 21, 30
12, 20, 29
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PIN
10
13
14
15
16
17
1
2
3
4
5
6
7
8
9
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.
50Ω
0V OR V+
DDCA0
DDCB0
DDCA2
DDCB2
NAME
GND
V
QP
G0
EN
G2
R0
B0
H0
V0
V+
R2
B2
CL
SEL
R1, G1, B1
MAX4885
Charge-Pump Enable, Active Low. Drive QP low for normal operation. Drive QP high to disable the
internal charge pump.
RGB Analog I/O
RGB Analog I/O
RGB Analog I/O
Horizontal Sync I/O
Vertical Sync I/O
DDC I/O
DDC I/O
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.
DDC Clamp Voltage. Open-drain DDCA_ and DDCB_ outputs are clamped to one diode-drop below
V
clamping. Bypass V
Supply Voltage. V+ = +5.0V ± 10%. Bypass each to GND with a 0.1µF or larger ceramic capacitor.
Ground
DDC I/O
DDC I/O
RGB Analog I/O
RGB Analog I/O
RGB Analog I/O
GND
+5V
CL
V+
R2, G2, B2
R0, G0, B0
. +2.7V < V
10nF
CL
< V+. Connect V
V
V
CL
IN
OUT
Timing Circuits/Timing Diagrams (continued)
to GND with a 0.1µF or larger ceramic capacitor.
MEAS
50Ω
CL
50Ω
to +3.3V for voltage clamping, or connect to V+ to disable
ANALYZER
NETWORK
FUNCTION
50Ω
50Ω
REF
OFF-ISOLATION = 20log
CROSSTALK = 20log
ON-LOSS = 20log
Pin Description
✕
✕
✕
V
V
V
V
OUT
IN
V
V
OUT
OUT
IN
IN