
MAX11501/MAX11502
Three-Channel,
Standard-Definition Video Filters
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5
Detailed Description
Each channel of the MAX11501/MAX11502 contains a
transparent input clamp, an 8.6MHz (MAX11501) or
8.9MHz (MAX11502), 5th-order lowpass filter and an
output amplifier with a gain of two (see the
Typical
Operating Circuit). The MAX11501 provides a flat pass-
band response and the MAX11502 features a +0.8dB
high-frequency boost at 5MHz on all channels to help
with system roll-off. Within the passband, each channel
amplifies the signal by two and adds 280mV of offset.
VOUT = (2 x VIN) + 0.28V
Typical voltage levels are shown in Figures 1 and 2.
Inputs
Transparent Clamps
All inputs feature transparent clamps to allow either AC
or DC input coupling. The clamp remains inactive while
the input signal is above ground, offering true DC input
coupling. If the signal goes below ground, as when the
signal is AC-coupled, the internal clamp sets the sync
tip at slightly below the ground level.
INPUT SIGNAL
0.3V
1.0V
0.0V
OUTPUT SIGNAL
0.88V
2.28V
0.28V
IN_
OUT_
MAX11501
MAX11502
Figure 1. Typical AC-Coupled Signal
Pin Description
PIN
NAME
FUNCTION
1
IN1
Video Input Channel 1
2
IN2
Video Input Channel 2
3
IN3
Video Input Channel 3
4VCC
Power Supply
5
GND
Ground
6
OUT3
Video Output Channel 3
7
OUT2
Video Output Channel 2
8
OUT1
Video Output Channel 1