Datasheet

Detailed Description
The MAX4548/MAX4549 are serial-interface, program-
mable, triple 3x2 audio/video crosspoint switches. Each
device contains two crosspoint switches with a com-
mon bypass network and another crosspoint switch
with its own bypass network. The switches are indepen-
dently controlled through the on-chip serial interface.
The MAX4548 uses a 2-wire I
2
C-compatible serial com-
munications protocol, while the MAX4549 uses a 3-wire
SPI/QSPI/MICROWIRE-compatible serial communica-
tions protocol.
These ICs include twelve selectable bias-resistor net-
works (one for each input) for use with AC-coupled
input signals. They operate from a single supply of
+2.7V to +5.5V and are optimized for use in the audio
frequency range to 20kHz and at video frequencies to
10MHz. They feature 35Ω max on-resistance, 7Ω on-
resistance matching between channels, 5Ω on-resis-
tance flatness, and as low as 0.07% total harmonic
distortion.
MAX4548/MAX4549
Serially Controlled, Triple 3x2 Audio/Video
Crosspoint Switches
______________________________________________________________________________________ 11
DECODER/
ENCODER
V+/2
V+
V+/2
2/3
SIGNAL
GENERATOR
GND
NO1_
R
S
10nF
S_
COM1_
COM2_
1µF
ANALYZER
ANALYZER
R
L
R
L
MAX4548
MAX4549
Figure 2a. Off-Isolation
MAX4548
MAX4549
V
IN
V
OUT
10k
10k
10k
10k
10k
R
S
SIGNAL
GENERATOR
Figure 2b. Crosstalk
MAX4548
MAX4549
10k
10k
10k
V
IN
R
S
SIGNAL
GENERATOR
V
OUT
Figure 2c. All-Hostile Crosstalk