MAX4887ETE+ Maxim Integrated Products, MAX4887ETE+ Datasheet - Page 8

• Manufacturer Part Number: MAX4887ETE+
• Description: IC SWITCH VIDEO TRPL 16TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX4887ETE+

• Function: Video Switch
• Circuit: 3 x 1:2
• On-state Resistance: 6.5 Ohm
• Voltage Supply Source: Single Supply
• Voltage - Supply, Single/dual (±): 3.3V, 5V
• Current - Supply: 1µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

A low-noise charge pump with internal capacitors pro-
vides a doubled voltage for driving the RGB analog
switches when operating the MAX4887 at low voltages
(V+ < 5V). The charge pump adds less than 163µV
of noise to the switches. When operating with V+ = 5V,
the charge pump can be disabled to further reduce
noise; however, the analog switch’s performance is
slightly degraded resulting in higher R
loss. Drive QP high to disable the charge pump. Drive
QP low for normal operation.
When operating the MAX4887 at 3.3V, connect QP
to GND.
Triple Video Switch
Figure 2. Switching Time
Figure 3. Charge Injection
8
_______________________________________________________________________________________
V
SWITCH
GEN
SWITCH
INPUT
INPUT
LOGIC
INPUT
MAX4887
MAX4887
R
V
GEN
IN
C
V
OUT
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
RO, GO, BO
SEL
RO, GO, BO
= V
GND
GND
IN
(
R
L
+ R
R
L
ON
SEL
)
R_, G_, B_
R_, G_, B_
LOGIC INPUT (0 TO V+)
V+
V+
V+
V+
Charge Pump
ON
and insertion
SWITCH
OUTPUT
R
L
C
SWITCH
OUTPUT
L
V OUT
P-P
C
V
L
OUT
The MAX4887 has two logic inputs that control the
switch configuration and on/off function. Use SEL to
switch (RGB)
the switch inputs to the outputs. Drive EN low to enable
the RGB switches inputs/outputs. Drive EN high to
place all inputs/outputs in a high-impedance state.
Table 1 illustrates the MAX4887 truth table.
Table 1. Switch Truth Table
EN
V
0
0
1
SEL
OUTPUT
OUT
SWITCH
LOGIC
INPUT
Timing Diagrams/Test Circuits
V+
0V
V
OUT
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
V+
0V
0V
OFF
0
SEL
X
0
1
to (RGB)
(RGB)
(RGB)
R_, B_, and G_ High Impedance
t
ON
50%
Q = (∆V
1
or (RGB)
0
0
0.9 x V
Logic Inputs (
to (RGB)
to (RGB)
ON
OUT
0UT
)(C
L
FUNCTION
)
2
t
1
2
. Use EN to connect
OFF
∆V
t r < 5ns
t f < 5ns
OUT
0.9 x V
OFF
0UT
EN , SEL)