19-1496; Rev 0; 6/99
Serially Controlled, Triple 3x2 Audio/Video
Crosspoint Switches
General Description
The MAX4548/MAX4549 serial-interface, programmable,
triple 3x2 audio/video crosspoint switches are ideal for
multimedia applications. The devices include three
crosspoint switch matrices, each containing three inputs
and two outputs. To improve off-isolation, each switch
matrix has a shunt input and each output is selectively
programmable for clickless or regular-mode operation. A
selectable set of internal resistive voltage dividers sup-
plies DC bias for each output when using AC-coupled
inputs. To improve crosstalk, the voltage dividers include
four externally accessible bypass points.
The MAX4548/MAX4549 feature 35Ω max on-resis-
tance, 7Ω on-resistance matching between channels,
5Ω on-resistance flatness, and 0.07% total harmonic
distortion (THD). Additionally, they feature off-isolation
of -85dB at 20kHz and -72dB at 10MHz, with crosstalk
of -85dB at 20kHz and -55dB at 10MHz. The MAX4548
uses a 2-wire I
2
C™-compatible serial interface, while
the MAX4549 uses a 3-wire SPI™/QSPI™/MICROWIRE™-
compatible serial interface. These parts are available in
36-pin SSOP packages and are specified for the
extended (-40°C to +85°C) operating range.
Features
o
Selectable Soft-Switching Mode for “Clickless”
Audio Operation
o
22Ω Typical On-Resistance (+5V Supply)
o
5Ω Typical On-Resistance Matching Between
Channels
o
2Ω Typical On-Resistance Flatness
o
Audio Performance
-85dB Off-Isolation at 20kHz
-85dB Crosstalk at 20kHz
0.07% THD with 600Ω Load
o
Video Performance
-72dB Off-Isolation at 10MHz
-55dB Crosstalk at 10MHz
o
Serial Interface
2-Wire I
2
C-Compatible (MAX4548)
3-Wire SPI/QSPI/MICROWIRE-Compatible
(MAX4549)
o
Single-Supply Operation from +2.7V to +5.5V
MAX4548/MAX4549
Pin Configuration
Applications
Set-Top Boxes
PC Multimedia Boards
Video Conferencing Systems
High-End Audio Systems
Security Systems
TOP VIEW
NO1C 1
CBIASH 2
NO2C 3
SC 4
NO3C 5
V+ 6
36 CBIASL
35 COM1C
34 MID5
33 COM2C
32 GND
Ordering Information
PART
MAX4548EAX
MAX4549EAX
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
36 SSOP
36 SSOP
MAX4548
MAX4549
31 COM1A
30 MID1
29 COM1B
28 MID2
27 COM2A
26 MID3
25 COM2B
24 MID4
23 ABIASH
22 ABIASL
21 V+
20 A0 (CS)
19 A1 (DOUT)
NO1A 7
N01B 8
SA 9
NO2A 10
N02B 11
SB 12
N03A 13
Functional Diagram appears at end of data sheet.
N03B 14
GND 15
GND 16
SDA (DIN) 17
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
I
2
C is a trademark of Philips Corp.
SCL (SCLK) 18
( ) ARE FOR MAX4549
SSOP
1
________________________________________________________________
Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Serially Controlled, Triple 3x2 Audio/Video
Crosspoint Switches
MAX4548/MAX4549
ABSOLUTE MAXIMUM RATINGS
V+ to GND ................................................................-0.3V to +6V
NO_ _, S_, MID_, BYP, COM_ _, CBIASL,
ABIASL, CBIASH, ABIASH, DOUT to GND
(Note 1)......................................................-0.3V to (V+ + 0.3V)
CS,
A0, A1, SDA, SCL, DIN,
SCLK to GND ........................................................-0.3V to +6V
Continuous Current into Any Terminal..............................±20mA
Peak Current, NO_ _, S_, COM_ _
(pulsed at 1ms, 10% duty cycle max) ...........................±40mA
Continuous Power Dissipation (T
A
= +70°C)
36-Pin SSOP (derate 11.8mW/°C above +70°C) ..........941mW
Operating Temperature Range ............................-40°C to+85°C
Storage Temperature Range ..............................-65°C to+150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Note 1:
Signals on NO_ _, S_, or COM_ _ exceeding V+ or GND are clamped by internal diodes. Limit forward diode current to
maximum rating.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—Single +5V Supply
(V+ = +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
ANALOG SWITCHES
Analog Signal Range (Note 3)
V
NO
_ _,
V
COM
_ _,
V
S
_
R
ON
I
COM_ _
= 4mA,
V
NO_ _
or V
S_
= 3V,
V+ = 4.75V
I
COM_ _
= 4mA,
V
NO_ _
or V
S_
= 3V,
V+ = 4.75V
I
COM_ _
= 4mA;
V+ = 4.75V; V
NO_ _
or V
S_
= 1V, 2V, 3V
V
NO_ _
or V
S_
= 4.5V,
1V; V
COM_ _
= 1V,
4.5V; V+ = 5.25V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
-2
-10
-2
-10
-2
-10
0.04
0.04
0.04
2
5
0
22
V+
35
45
7
8
5
7
2
nA
10
2
nA
10
2
nA
T
A
= T
MIN
to T
MAX
10
Ω
Ω
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
On-Resistance
COM_ _ to NO_ _ or S_
On-Resistance Match
Between Channels (Note 4)
COM_ _ to NO_ _ or S_
On-Resistance Flatness
(Note 5)
NO_ _ or S_ Off-Leakage
Current (Note 6)
COM_ _ Off-Leakage
Current (Note 6)
Ω
∆R
ON
R
FLAT
I
NO
_ _
(OFF)
V
NO_ _
or V
S_
= 4.5V, T
A
= +25°C
I
COM
_ _
(OFF)
1V; V
COM_ _
= 1V,
T
A
= T
MIN
to T
MAX
4.5V; V+ = 5.25V
V
NO
_ _ or V
S_
= 4.5V,
1V, or floating;
V
COM_ _
= 4.5V, 1V;
V+ = 5.25V
T
A
= +25°C
COM_ _On-Leakage
Current (Note 6)
AUDIO PERFORMANCE
Total Harmonic Distortion
plus Noise
Off-Isolation (Note 7)
Channel-to-Channel Crosstalk
I
COM
_ _
(ON)
THD+N
f
IN
= 1kHz, V
NO_ _
or V
S_
= 1V
RMS
+
2.5V
DC
R
L
= 600Ω
R
L
=10kΩ
0.07
%
0.006
-85
-85
dB
dB
V
ISO(A)
V
CT(A)
V
NO
_ _ = 1V
RMS
, f
IN
= 20kHz, R
L
= 600Ω,
S
_
= GND, shunt switch on or off
V
NO
_ _ = 1V
RMS
, f
IN
= 20kHz,
R
L
= R
S
= 600Ω
2
_______________________________________________________________________________________
Serially Controlled, Triple 3x2 Audio/Video
Crosspoint Switches
ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)
(V+ = +5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
VIDEO PERFORMANCE
Off-Isolation (Note 7)
V
ISO(V)
V
NO_ _
or V
S_
= 1V
RMS
,
f
IN
= 10MHz, R
L
= 50Ω,
R
S
=50Ω, S_ = GND
Shunt switch on
Shunt switch off
-72
dB
-62
-55
250
10
200
400
500
100
200
ns
250
10
50
ns
dB
MHz
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4548/MAX4549
Channel-to-Channel Crosstalk
-3dB Bandwidth
Off-Capacitance
V
CT(V)
BW
C
OFF(NO)
V
NO_ _
or V
S_
= 0.5V
RMS
, R
S
= 50Ω,
f
IN
= 10MHz, R
L
= 50Ω,
R
S
= 50Ω, R
L
= 50Ω
f = 1MHz
V
NO_ _
or V
S_
= 2.5V, T
A
= +25°C
R
L
= 5kΩ, C
L
= 35pF T
A
= T
MIN
to T
MAX
V
NO_ _
or V
S_
= 2.5V, T
A
= +25°C
R
L
= 300Ω,
T
A
= T
MIN
to T
MAX
C
L
= 35pF
V
NO_ _
or V
S_
= 2.5V
V
NO_ _
or V
S_
= 2.5V, R
L
= 5kΩ, C
L
= 35pF,
T
A
= +25°C
V
NO_ _
or V
S_
= 2.5V, R
L
= 300Ω, C
L
= 35pF,
T
A
= +25°C
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED
(Note 8, Figure 1)
Turn-On Time
t
ONSD
ns
Turn-Off Time
Break-Before-Make Time
t
OFFSD
t
BBM
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED
(Note 8, Figure 1)
Turn-On Time
Turn-Off Time
BIAS NETWORKS
Bias Network Resistance
POWER SUPPLIES
Supply Voltage Range
Supply Current (Note 9)
V+
I+
All logic inputs = GND or V+
2.7
6
5.5
10
V
µA
R
BIAS
110
kΩ
t
ONSE
t
OFFSE
12
3
ms
ms
ELECTRICAL CHARACTERISTICS—Single +3V Supply
(V+ = +3V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
ANALOG SWITCHES
Analog Signal Range (Note 3)
V
NO
_ _,
V
COM
_ _,
V
S
_
R
ON
I
COM
_ _ = 4mA,
V
NO
_ _ or V
S_
= 1V,
V+ = 2.7V
I
COM
_ _ = 4mA,
V
NO
_ _ or V
S_
= 1V,
V+ = 2.7V
I
COM_ _
= 4mA;
V+ = 2.7V;
V
NO_ _
= 1V, 1.5V, 2V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
3
5
0
40
V+
60
80
7
8
6
8
3
Ω
Ω
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
On-Resistance
COM_ _ to NO_ _ or S_
On-Resistance Match
Between Channels (Note 4)
COM_ _ to NO_ _ or S_
On-Resistance Flatness
(Note 5)
Ω
∆R
ON
R
FLAT
_______________________________________________________________________________________
Serially Controlled, Triple 3x2 Audio/Video
Crosspoint Switches
MAX4548/MAX4549
ELECTRICAL CHARACTERISTICS—Single +3V Supply (continued)
(V+ = +3V ±10%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
NO_ _ or S_ Off-Leakage
Current (Notes 6, 10)
COM _ Off-Leakage
Current (Notes 6, 10)
SYMBOL
I
NO_ _(OFF)
CONDITIONS
V
NO_ _
or V
S_
= 3V,
0.5V; V
COM_ _
= 0.5V,
3V; V+ = 3.6V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
MIN
-2
-10
-2
-10
-2
-10
0.04
0.04
TYP
0.04
MAX
2
nA
10
2
nA
10
2
nA
10
UNITS
V
NO_ _
or V
S_
= 3V,
I
COM
_ _
(OFF)
0.5V; V
COM_ _
= 0.5V,
3V; V+ = 3.6V
V
NO_ _
or V
S_
= 0.5V,
3V, or floating;
I
COM
_ _
(ON)
V
COM_ _
= 0.5V, 3V;
V+ = 3.6V
COM _ On-Leakage
Current (Notes 6, 10)
AUDIO PERFORMANCE
Total Harmonic Distortion
plus Noise
THD+N
f
IN
= 1kHz, V
NO_ _
or V
S_
= 1.5V
DC
+
0.5V
RMS
R
L
= 600Ω
R
L
= 10Ω
0.1
%
0.01
-85
dB
Off-Isolation (Note 7)
V
ISO(A)
V
NO_ _
= 0.5V
RMS
, f
IN
= 20kHz,
R
L
= 600Ω, S
–
= GND,
shunt switch on or off
V
NO_ _
= 0.5V
RMS
, f
IN
= 20kHz,
R
L
= 600kΩ, R
S
= 600Ω
Channel-to-Channel Crosstalk
VIDEO PERFORMANCE
V
CT(A)
-85
dB
Off-Isolation (Note 7)
V
ISO(V)
V
NO_ _
or V
S _
=
0.5V
RMS
,
f
IN
= 10MHz,
R
L
= 50Ω, R
S
= 50Ω
Shunt switch on
Shunt switch off
-72
dB
-62
-55
200
10
dB
MHz
pF
Channel-to-Channel Crosstalk
-3dB Bandwidth
Off-Capacitance
V
CT(V)
BW
C
OFF(NO)
V
NO_ _
or V
S_
= 0.5V
RMS
,
R
S
= 50Ω, f
IN
= 10MHz, R
L
= 50Ω
R
S
= 50Ω, R
L
= 50Ω
f = 1MHz
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED
(Notes 8 and 12, Figure 1)
Turn-On Time
t
ONSD
V
NO_ _
or V
S_
= 1.5V,
R
L
= 5kΩ, C
L
= 35pF
T
A
= +25°C
T
A
= T
MIN
to T
MAX
200
400
800
ns
1000
350
ns
500
10
100
12
3
110
ns
ms
ms
kΩ
Turn-Off Time
Break-Before-Make Time
Turn-On Time
Turn-Off Time
BIAS NETWORK
Bias Network Resistance
t
OFFSD
t
BBM
t
ONSE
t
OFFSE
R
BIAS
T
A
= +25°C
V
NO_ _
or V
S_
= 1.5V,
R
L
= 300Ω, C
L
= 35pF T = T
A
MIN
to T
MAX
V
NO_ _
or V
S_
= 1.5V
V
NO_ _
or V
S_
= 1.5V, R
L
= 5kΩ, C
L
= 35pF
V
NO_ _
or V
S_
= 1.5V, R
L
= 300Ω, C
L
= 35pF
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED
(Notes 8 and 12, Figure 1)
4
_______________________________________________________________________________________
Serially Controlled, Triple 3x2 Audio/Video
Crosspoint Switches
I/O INTERFACE CHARACTERISTICS
(V+ = +2.7V to +5.25V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
0.8
0.6
3
2
0.2
Digital inputs = GND or V+
f = 1MHz
I
SINK
= 6mA
I
SOURCE
= 0.5mA
V+ - 0.5
-1
0.001
5
0.4
1
UNITS
DIGITAL INPUTS (SCLK, DIN,
CS,
SCL, SDA, A0, A1)
V+ = 5V
Input Low Voltage
V
IL
V+ = 3V
Input High Voltage
Input Hysteresis
Input Leakage Current
Input Capacitance
DIGITAL OUTPUTS (DOUT, SDA)
Output Low Voltage
DOUT Output High Voltage
V
OL
V
OH
V
V
V
IH
V
HYST
I
LEAK
C
IN
V+ = 5V
V+ = 3V
MAX4548/MAX4549
V
V
V
µA
pF
2-WIRE TIMING CHARACTERISTICS (Figure 3)
(V+ = +2.7V to +5.25V, f
SCL
= 100kHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
SCL Clock Frequency
Bus-Free Time between Stop
and Start Condition
Hold Time After Start Condition
Pulse Width of Suppressed
Spike (Note 3)
STOP Condition Setup Time
Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
SCL/SDA Rise Time (Note 11)
SCL/SDA Fall Time (Note 11)
t
SU:STO
t
HD:DAT
t
SU:DAT
t
LOW
t
HIGH
t
R
t
F
SYMBOL
f
SCL
t
BUF
t
HD:STA
CONDITIONS
V+ = 4.75V to 5.25V
V+ = 2.7V to 5.25V
MIN
0
0
4.7
4
0
4
0
250
4.7
4
20 +
0.1C
b
20 +
0.01C
b
300
300
50
TYP
MAX
400
100
UNITS
kHz
µs
µs
ns
µs
µs
ns
µs
µs
ns
ns
_______________________________________________________________________________________
5
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