19-1397; Rev 0; 10/98
KIT
ATION
EVALU
BLE
AVAILA
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
General Description
Features
o
Selectable Soft Switching Mode for Clickless
Audio Operation
o
43Ω Typical On-Resistance (±5V Supplies)
o
5Ω Typical On-Resistance Matching Between
Channels
o
4Ω Typical On-Resistance Flatness
o
0.014% Total Harmonic Distortion with 1kΩ Load
o
-110dB Off-Isolation at 20kHz
-78dB Off-Isolation at 4MHz
o
-95dB Crosstalk at 20kHz
-54dB Crosstalk at 4MHz
o
Serial Interface
2-Wire, Fast-Mode, I
2
C-Compatible (MAX4550)
3-Wire, SPI/QSPI/MICROWIRE-Compatible
(MAX4570)
o
Four Auxiliary Outputs that Extend µP Ports
o
Single-Supply Operation: +2.7V to +5.5V
Dual-Supply Operation: ±2.7V to ±5.5V
MAX4550/MAX4570
The MAX4550/MAX4570 serial-interface, programma-
ble, dual 4x2 audio/video crosspoint switches are ideal
for multimedia applications. Each device contains two
identical crosspoint switch arrays, each with four inputs
and two outputs. To improve off-isolation, use the addi-
tional crosspoint inputs SA and SB as shunts. Each out-
put is selectively programmable for clickless or regular
mode operation. A set of internal resistive voltage-
dividers supplies DC bias for each output when using
AC-coupled inputs. Additionally, four auxiliary outputs
control additional circuitry via the MAX4550/MAX4570’s
2-wire or 3-wire interface.
The MAX4550/MAX4570 feature 80Ω on-resistance, 10Ω
on-resistance matching between channels, 5Ω on-
resistance flatness, and 0.014% total harmonic distor-
tion. Additionally, they feature off-isolation of at least
-110dB in the audio frequency range and -78dB at
4MHz, with -95dB crosstalk in the audio frequency
range and -54dB at 4MHz. The MAX4550 uses a 2-wire
I
2
C-compatible serial interface, while the MAX4570
uses a 3-wire SPI™/QSPI™ or MICROWIRE™-compati-
ble serial interface. These parts are available in 28-pin
SSOP and wide SO packages and are tested over
either the commercial (0°C to +70°C) or extended
(-40°C to +85°C) operating temperature range.
Pin Configuration
TOP VIEW
SB 1
NO3A 2
NO3B 3
BIASH 4
28 SA
27 NO2B
26 NO2A
25 V-
24 V+
Applications
Set-Top Boxes
PC Multimedia Boards
High-End Audio Systems
Video Conferencing Systems
Ordering Information
PART
MAX4550CAI
MAX4550CWI
MAX4550EAI
MAX4550EWI
MAX4570CAI
MAX4570CWI
MAX4570EAI
MAX4570EWI
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
28 Wide SO
BIASL 5
NO4A 6
NO4B 7
V+ 8
COM2A 9
Q0 10
COM2B 11
Q1 12
A0 (CS) 13
SCL (SCLK) 14
MAX4550
MAX4570
23 NO1B
22 NO1A
21 GND
20 COM1A
19 Q3
18 COM1B
17 Q2
16 A1 (DOUT)
15 SDA (DIN)
I
2
C is a trademark of Philips Corp.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
SO/SSOP
( ) ARE FOR MAX4570.
Functional Diagram appears at end of data sheet.
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, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
MAX4550/MAX4570
ABSOLUTE MAXIMUM RATINGS
V+ to GND ............................................................... -0.3V to +6V
V+ to V-................................................................-0.3V to +13.2V
V- to GND .................................................................+0.3V to -6V
NO_ _ , S_, BIAS_, COM_ _, Q_, A1, DOUT to GND
(Note 1)...............................................(V- - 0.3V) to (V+ + 0.3V)
CS,
SCLK, DIN, SCL, SDA, A0 to GND ....................-0.3V to +6V
Continuous Current into Any Terminal..............................±10mA
Peak Current, NO_ _ , S_ , COM_ _
(pulsed at 1ms, 10% duty cycle max) ..........................±40mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW
28-Pin Wide SO (derate 12.5mW/°C above +70°C) ...1000mW
Operating Temperature Ranges
MAX4550C_I/MAX4570C_I ...............................-0°C to +70°C
MAX4550E_I/MAX4570E_I ..............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Note 1:
Signals on NO_ _, S_, or COM_ _ exceeding V+ or V- are clamped by internal diodes. Limit forward-diode current to maxi-
mum current 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.
ANALOG ELECTRICAL CHARACTERISTICS—Dual Supplies
(V+ = +5V ±5%, 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_
= ±3.0V,
V+ = 4.75V, V- = -4.75V
I
COM_ _
= 4mA,
V
NO_ _
or V
S_
= ±3.0V,
V+ = 4.75V, V- = -4.75V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
4
5
V-
43
V+
80
100
10
10
5
8
-1
-10
-5
-10
-5
-20
0.01
0.01
0.01
1
nA
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
10
5
nA
10
5
nA
20
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)
COM_ _ On-Leakage Current
(Note 6)
AUDIO PERFORMANCE
Total Harmonic Distortion plus
Noise
Off-Isolation (Note 7)
Channel-to-Channel Crosstalk
Channel-to-Channel Crosstalk
Ω
∆R
ON
I
COM_ _
= 4mA;
T
A
= +25°C
∆R
FLAT(ON)
V
NO_ _
or V
S_
= ±3.0V, 0;
T
A
= T
MIN
to T
MAX
V+ = 4.75V; V- = -4.75V
NO
_(OFF)
V
NO_ _
or V
S_
= ±4.5V,
–
V
COM_
= +4.5V,
V+ = 5.25V, V- = -5.25V
V
NO_ _
or V
S_
= ±4.5V,
–
V
COM_
= +4.5V,
V+ = 5.25V, V- = -5.25V
V
NO_ _
or V
S_
= floating,
V
COM_
= ±4.5V,
V+ = 5.25V, V- = -5.25V
T
A
= +25°C
I
COM_(OFF)
I
COM_(ON)
THD+N
V
ISO(A)
V
CTA(A)
V
CTA(A)
f
IN
= 1kHz, R
L
= 1kΩ, V
NO_
or V
S_
= 1V
RMS
,
V
NO_
or V
S_
= 0
V
NO
= 1V
RMS
, f
IN
= 20kHz,
R
L
= 10kΩ, S = GND
Shunt switch on
Shunt switch off
0.014
-110
-80
-95
%
dB
dB
ICOM_
or
=
S_
= 1V
RMS
, f
IN
= 20kHz,
V
NO_ _
_
V
1mA
R
L
= 10kΩ, three channels driven at 20kHz
2
_______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
ANALOG ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +5V ±5%, 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
V
ISO(V)
V
CT(V)
BW
C
OFF(NO)
t
ONSD
t
OFFSD
t
BBM
t
ONSE
t
OFFSE
R
BIAS
V+
V-
I+
I-
Reset condition, V+ = 2.7V to 5.25V
Reset condition, V- = -5.25V to 0
V
NO_ _
or V
S_
= 1
VRMS
,
f
IN
= 4MHz, R
L
= 1kΩ,
S_ = GND
Shunt switch on
Shunt switch off
-78
dB
-63
-54
14
11
400
200
10
100
36
11
13
2.7
-5.25
7
20
27
5.25
0
20
-20
900
500
dB
MHz
pF
ns
ns
ns
ms
ms
kΩ
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4550/MAX4570
Channel-to-Channel Crosstalk
0.1dB Bandwidth
Off-Capacitance
Turn-On Time (Note 9)
Turn-Off Time (Note 9)
Break-Before-Make Time
Turn-On Time
Turn-Off Time
BIAS NETWORKS
Bias Network Resistance
POWER SUPPLIES
Supply Voltage Range
V+ Supply Current (Note 10)
V- Supply Current
V
NO_ _
or V
S_
= 1
VRMS
, f
IN
= 4MHz,
R
L
= 10Ω, three channels driven at 4MHz
R
S
= 75Ω, R
L
= 1kΩ
f
IN
= 1MHz,
V
NO_ _
or V
S_
= 1.5V, R
L
= 5kΩ
V
NO_ _
or V
S_
= 1.5V, R
L
= 300Ω
V
NO_ _
or V
S_
= 1.5V
V
NO_ _
or V
S_
= 1.5V, R
L
= 5kΩ
V
NO_ _
or V
S_
= 1.5V, R
L
= 300Ω
BIASH to BIASL
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED
(Note 8)
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED
(Note 8, Figure 5)
V
µA
µA
ANALOG ELECTRICAL CHARACTERISTICS—Single +5V Supply
(V+ = +5V ±5%, V- = 0, 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_
= 3.0V,
V+ = 4.75V
I
COM_ _
= 4mA,
V
NO_ _
or V
S_
= 3.0V,
V+ = 4.75V
I
COM_ _
= 4mA;
V
NO_ _
or V
S_
= 1V, 2V,
3V; V+ = 4.75V
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
-1
-10
0.01
4
5
0
60
V+
100
130
10
10
10
15
1
nA
10
3
Ω
Ω
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
On-Resistance
Ω
On-Resistance Match Between
Channels (Note 4)
On-Resistance Flatness
(Note 5)
NO_ _ or S_ Off-Leakage
Current (Notes 6, 11)
∆R
ON
R
FLAT
V
NO
or V
S_
= 4.5V, 1V;
I
NO_ _(OFF)
V
COM_ _
= 1V, 4.5V;
V+ = 5.25V
_______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
MAX4550/MAX4570
ANALOG ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)
(V+ = +5V ±5%, V- = 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
COM_ _ Off-Leakage Current
(Notes 6, 11)
COM_ _ On-Leakage Current
(Notes 6, 11)
AUDIO PERFORMANCE
Total Harmonic Distortion plus
Noise
Off-Isolation (Note 7)
Channel-to-Channel Crosstalk
VIDEO PERFORMANCE
Off-Isolation (Note 7)
Channel-to-Channel Crosstalk
0.1dB Bandwidth
Off-Capacitance
Turn-On Time (Note 9)
Turn-Off Time (Note 9)
Break-Before-Make Time
Turn-On Time
Turn-Off Time
BIAS NETWORKS
Bias Network Resistance
R
BIAS
BIASH to BIASL
13
20
27
kΩ
V
ISO(V)
V
TC(V)
BW
C
OFF(NO)
t
ONSD
t
OFFSD
t
BBM
t
ONSE
t
OFFSE
V
NO_ _
or V
S_
= 1V
RMS
, f
IN
=
4MHz, R
L
= 1kΩ, S = GND
Shunt switch on
Shunt switch off
-74
-61
-52
13
11
400
160
10
100
43
14
900
500
dB
dB
MHz
pF
ns
ns
ns
ms
ms
THD+N
V
ISO(A)
V
TC(A)
f
IN
= 1kHz, R
L
= 10kΩ, V
NO_ _
or V
S_
= 1V
RMS
,
V
NO_ _
or V
S_
= 2.5V
V
NO_ _
or V
S_
= 1V
RMS
, f
IN
=
20kHz, R
L
= 10kΩ, S = GND
Shunt switch on
Shunt switch off
0.014
-105
-80
-97
%
dB
dB
SYMBOL
CONDITIONS
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
MIN
-5
-10
-5
-20
0.01
TYP
0.01
MAX
5
nA
10
5
nA
20
UNITS
V
NO_ _
or V
S_
= 4.5V, 1V;
I
COM_ _(OFF)
V
COM_ _
= 1V, 4.5V;
V+ = 5.25V
V
NO_ _
or V
S_
= floating;
I
COM_ _(ON)
V
COM_ _
= 1V, 4.5V;
V+ = 5.25V
V
NO_ _
or V
S_
= 1V
RMS
, f
IN
= 20kHz,
R
L
= 10kΩ, three channels driven at 20kHz
V
NO_ _
or V
S_
= 1V
RMS
, f
IN
= 4MHz,
R
L
= 10kΩ, three channels driven at 4MHz
R
SOURCE
= 75Ω, R
L
= 1kΩ
f
IN
= 1MHz
V
NO_ _
or V
S_
= 1.5V, R
L
= 5kΩ
V
NO_ _
or V
S_
= 1.5V, R
L
= 300Ω
V
NO_ _
or V
S_
= 1.5V
V
NO_ _
or V
S_
= 1.5V, R
L
= 5kΩ
V
NO_ _
or V
S_
= 1.5V, R
L
= 300Ω
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED
(Note 8)
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED
(Note 8, Figure 5)
ANALOG ELECTRICAL CHARACTERISTICS—Single +3V Supply
(V+ = +3V ±10%, V- = 0, 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
T
A
= +25°C
T
A
= T
MIN
to T
MAX
0
106
V+
180
220
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
On-Resistance
Ω
4
_______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
INTERFACE I/O CHARACTERISTICS
(V+ = +2.7V to +5.5V, V- = 0 to -5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
AUXILIARY OUTPUTS
Output High Voltage
Output Low Voltage
V
OH
V
OL
I
SOURCE
= 1mA to GND, V+ = 4.75V
I
SOURCE
= 0.5mA to GND, V+ = 2.7V
I
SINK
= 6mA, V+ = 2.7V
I
SINK
= 12mA, V+ = 4.75V
V+ > 3.6V
V+ < 3.6V
V+ > 3.6V
V+ < 3.6V
0.2
V
NO_ _
= 0 or 5V
-1
0.01
5
I
SINK
= 6mA
I
SINK
= 6mA
I
SOURCE
= 0.5mA
V+ = 4.75V
V+ = 2.7V
V+ - 0.5 V+ - 0.1
DC
1.3
0.6
0
100
1.3
0.6
20 +
0.1Cb
20 +
0.1Cb
DC
100
0
C
LOAD
= 50pF
20
100
0
200
300
300
0.9
400
0.4
0.8
1
3.0
2.0
0.8
0.6
4.45
2.3
4.65
2.5
0.5
0.5
1.0
1.0
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4550/MAX4570
DIGITAL INPUTS (SCK, DIN,
CS,
SCL, SDA)
Input High Voltage
Input Low Voltage
Input Hysteresis
Input Leakage Current (Note 7)
Input Capacitance
DIGITAL OUTPUTS (DOUT, SDA)
Output Low Voltage
DOUT Output High Voltage
2
V
IH
V
IL
V
HYST
I
LEAK
C
NO
V
V
V
µA
pF
V
OL
V
OH
f
SCL
t
BUF
t
SU:STO
t
HD:DAT
t
SU:DAT
t
LOW
t
HIGH
t
R
t
F
V
V
kHz
µs
µs
µs
ns
µs
µs
ns
ns
I C TIMING
(V+ = +4.75V to +5.25V, Figures 1, 2)
SCL Clock Frequency
Bus Free Time between Stop
and Start Condition
STOP Condition Setup Time
Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
SCL/SDA Rise Time
(Note 12)
SCL/SDA Fall Time
(Note 12)
Operating Frequency
DIN to SCLK Setup
DIN to SCLK Hold
SCLK Fall to Output Data Valid
CS
to SCLK Rise Setup
CS
to SCLK Rise Hold
SPI TIMING
(V+ = +4.75V to +5.25V, Figures 3, 4)
f
OP
f
DS
f
DH
f
DO
f
CSS
f
CSH
2.1
MHz
ns
ns
ns
ns
ns
_______________________________________________________________________________________
5
模拟与混合信号
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
