MAX4550CAI-T [MAXIM]
Cross Point Switch, 2 Func, 4 Channel, CMOS, PDSO28, 5.30 X 0.65 MM, SSOP-28;
| 型号： | MAX4550CAI-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Cross Point Switch, 2 Func, 4 Channel, CMOS, PDSO28, 5.30 X 0.65 MM, SSOP-28 光电二极管 输出元件 |
| 文件： | 总16页 (文件大小：171K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1397; Rev 0; 10/98
S e ria lly Co n t ro lle d , Du a l 4 x 2 , Clic k le s s
Au d io /Vid e o An a lo g Cro s s p o in t S w it c h e s
/MAX4570
Ge n e ra l De s c rip t io n
Fe a t u re s
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.
♦ Selectable Soft Switching Mode for Clickless
Audio Operation
♦ 43Ω Typical On-Resistance (±5V Supplies)
♦ 5Ω Typical On-Resistance Matching Between
Channels
♦ 4Ω Typical On-Resistance Flatness
♦ 0.014% Total Harmonic Distortion with 1kΩ Load
♦ -110dB Off-Isolation at 20kHz
-78dB Off-Isolation at 4MHz
The MAX4550/MAX4570 feature 80Ω on-resistance, 10Ω
on-re s is ta nc e ma tc hing b e twe e n c ha nne ls , 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
I2C-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 a nd wid e SO p a c ka g e s a nd a re te s te d ove r
e ithe r the c omme rc ia l (0°C to +70°C) or e xte nd e d
(-40°C to +85°C) operating temperature range.
♦ -95dB Crosstalk at 20kHz
-54dB Crosstalk at 4MHz
♦ Serial Interface
2-Wire, Fast-Mode, I2C-Compatible (MAX4550)
3-Wire, SPI/QSPI/MICROWIRE-Compatible
(MAX4570)
♦ Four Auxiliary Outputs that Extend µP Ports
♦ Single-Supply Operation: +2.7V to +5.5V
Dual-Supply Operation: ±2.7V to ±5.5V
P in Co n fig u ra t io n
Ap p lic a t io n s
Set-Top Boxes
TOP VIEW
SB
1
28 SA
PC Multimedia Boards
NO3A 2
27 NO2B
26 NO2A
25 V-
High-End Audio Systems
NO3B
BIASH
BIASL
3
4
5
Video Conferencing Systems
24 V+
Ord e rin g In fo rm a t io n
MAX4550
MAX4570
NO4A 6
23 NO1B
22 NO1A
21 GND
20 COM1A
19 Q3
PART
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
NO4B
V+
7
8
MAX4550CAI
MAX4550CWI
MAX4550EAI
MAX4550EWI
MAX4570CAI
MAX4570CWI
MAX4570EAI
MAX4570EWI
28 Wide SO
28 SSOP
COM2A 9
Q0 10
28 Wide SO
28 SSOP
COM2B 11
Q1 12
18 COM1B
17 Q2
28 Wide SO
28 SSOP
A0 (CS) 13
SCL (SCLK) 14
16 A1 (DOUT)
15 SDA (DIN)
28 Wide SO
SO/SSOP
I2C is a trademark of Philips Corp.
SPI/QSPI are trademarks of Motorola, Inc.
( ) ARE FOR MAX4570.
MICROWIRE is a trademark of National Semiconductor Corp.
Functional Diagram appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
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.
S e ria lly Co n t ro lle d , Du a l 4 x 2 , Clic k le s s
Au d io /Vid e o An a lo g Cro s s p o in t S w it c h e s
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
Continuous Power Dissipation (T = +70°C)
A
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
(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_ _
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
(pulsed at 1ms, 10% duty cycle max) ..........................±40mA
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 = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
MAX A
A
MIN
/MAX4570
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG SWITCHES
V
NO_ _
,
Analog Signal Range (Note 3)
On-Resistance
V
,
V-
V+
V
Ω
COM_ _
V
S_
I
V
= 4mA,
or V = ±3.0V,
NO_ _ S_
COM_ _
T
= +25°C
43
5
80
100
10
10
5
A
R
ON
T
A
= T
to T
V+ = 4.75V, V- = -4.75V
MIN
MAX
MAX
MAX
MAX
MAX
MAX
COM_ _ to NO_ _ or S_
On-Resistance Match Between
Channels (Note 4)
I
= 4mA,
COM_ _
T = +25°C
A
∆R
V
or V = ±3.0V,
Ω
ON
NO_ _
S_
T
A
= T
to T
V+ = 4.75V, V- = -4.75V
MIN
COM_ _ to NO_ _ or S_
On-Resistance Flatness
(Note 5)
I
= 4mA;
COM_ _
T
A
= +25°C
4
∆R
V
or V = ±3.0V, 0;
Ω
FLAT(ON)
NO_ _
S_
T
A
= T to T
MIN
8
V+ = 4.75V; V- = -4.75V
V
V
or V = ±4.5V,
S_
NO_ _
T
A
= +25°C
-1
-10
-5
0.01
0.01
0.01
1
NO_ _ or S_ Off-Leakage
Current (Note 6)
–
NO
=
4.5V,
nA
nA
nA
_(OFF)
COM_
+
T
A
= T to T
MIN
10
5
V+ = 5.25V, V- = -5.25V
V
V
or V = ±4.5V,
S_
NO_ _
T = +25°C
A
COM_ _ Off-Leakage Current
(Note 6)
–
I
=
4.5V,
_(OFF)
COM_
COM
+
T
A
= T to T
MIN
-10
-5
10
5
V+ = 5.25V, V- = -5.25V
V
V
or V = floating,
S_
= ±4.5V,
NO_ _
T = +25°C
A
COM_ _ On-Leakage Current
(Note 6)
I
_(ON)
COM_
COM
T
A
= T to T
MIN
-20
20
V+ = 5.25V, V- = -5.25V
AUDIO PERFORMANCE
Total Harmonic Distortion plus
Noise
f
V
= 1kHz, R = 1kΩ, V
or V = 1V
,
IN
L
NO_
S_
RMS
THD+N
0.014
%
or V = 0
S_
NO_
Shunt switch on
Shunt switch off
-110
-80
V
= 1V
= 10kΩ, S = GND
, f = 20kHz,
NO
RMS IN
Off-Isolation (Note 7)
V
dB
dB
ISO(A)
R
L
Channel-to-Channel Crosstalk
or V = 1V , f = 20kHz,
RMS IN
V
NO_ _
S_
V
-95
CTA(A)
R
= 10kΩ, three channels driven at 20kHz
L
2
_______________________________________________________________________________________
S e ria lly Co n t ro lle d , Du a l 4 x 2 , Clic k le s s
Au d io /Vid e o An a lo g Cro s s p o in t S w it c h e s
/MAX4570
ANALOG ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +5V ±5%, V- = -5V ±5%, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
MAX A
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VIDEO PERFORMANCE
V
or V = 1
,
VRMS
NO_ _
S_
Shunt switch on
Shunt switch off
-78
-63
Off-Isolation
V
f
= 4MHz, R = 1kΩ,
dB
dB
ISO(V)
IN
L
S_ = GND
or V = 1 , f = 4MHz,
VRMS IN
V
NO_ _
S_
Channel-to-Channel Crosstalk
V
-54
CT(V)
R
L
= 10Ω, three channels driven at 4MHz
0.1dB Bandwidth
Off-Capacitance
BW
R
= 75Ω, R = 1kΩ
14
11
MHz
pF
S
L
C
f
IN
= 1MHz,
OFF(NO)
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note 8)
Turn-On Time (Note 9)
Turn-Off Time (Note 9)
Break-Before-Make Time
t
V
or V = 1.5V, R = 5kΩ
400
200
100
900
500
ns
ns
ns
ONSD
NO_ _
S_
L
t
V
or V = 1.5V, R = 300Ω
OFFSD
NO_ _ S_ L
t
V
NO_ _
or V = 1.5V
10
13
BBM
S_
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 5)
Turn-On Time
t
V
NO_ _
or V = 1.5V, R = 5kΩ
36
11
ms
ms
ONSE
S_
L
Turn-Off Time
t
V
or V = 1.5V, R = 300Ω
OFFSE
NO_ _ S_ L
BIAS NETWORKS
Bias Network Resistance
POWER SUPPLIES
R
BIASH to BIASL
20
27
kΩ
BIAS
V+
V-
I+
I-
2.7
5.25
0
Supply Voltage Range
V
-5.25
V+ Supply Current (Note 10)
V- Supply Current
Reset condition, V+ = 2.7V to 5.25V
Reset condition, V- = -5.25V to 0
7
20
µA
µA
-20
ANALOG ELECTRICAL CHARACTERISTICS—Single +5V Supply
(V+ = +5V ±5%, V- = 0, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
A
MIN
MAX
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG SWITCHES
V
NO_ _
,
Analog Signal Range (Note 3)
On-Resistance
V
,
0
V+
V
Ω
COM_ _
V
S_
I
V
= 4mA,
or V = 3.0V,
NO_ _ S_
COM_ _
T
= +25°C
60
5
100
130
10
10
10
15
1
A
R
ON
T
A
= T
to T
MIN
MAX
MAX
MAX
MAX
V+ = 4.75V
I
= 4mA,
COM_ _
T
A
= +25°C
On-Resistance Match Between
Channels (Note 4)
∆R
V
or V = 3.0V,
Ω
ON
NO_ _
S_
T
A
= T
to T
MIN
V+ = 4.75V
I
= 4mA;
COM_ _
T
A
= +25°C
4
On-Resistance Flatness
(Note 5)
R
FLAT
V
or V = 1V, 2V,
Ω
NO_ _
S_
T
A
= T
to T
MIN
3V; V+ = 4.75V
V
V
or V = 4.5V, 1V;
NO
S_
T
A
= +25°C
-1
0.01
NO_ _ or S_ Off-Leakage
Current (Notes 6, 11)
I
= 1V, 4.5V;
nA
NO_ _(OFF)
COM_ _
T
A
= T
to T
-10
10
MIN
V+ = 5.25V
_______________________________________________________________________________________
3
S e ria lly Co n t ro lle d , Du a l 4 x 2 , Clic k le s s
Au d io /Vid e o An a lo g Cro s s p o in t S w it c h e s
ANALOG ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)
(V+ = +5V ±5%, V- = 0, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
A
MIN
MAX
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
or V = 4.5V, 1V;
S_
= 1V, 4.5V;
NO_ _
T
= +25°C
-5
0.01
5
A
COM_ _ Off-Leakage Current
(Notes 6, 11)
I
V
nA
COM_ _(OFF)
COM_ _
T
A
= T
to T
-10
-5
10
5
V+ = 5.25V
MIN
MAX
V
NO_ _
or V = floating;
S_
T
A
= +25°C
0.01
COM_ _ On-Leakage Current
(Notes 6, 11)
I
V
= 1V, 4.5V;
nA
COM_ _(ON)
COM_ _
T
A
= T to T
MIN
-20
20
V+ = 5.25V
MAX
AUDIO PERFORMANCE
Total Harmonic Distortion plus
Noise
f
V
= 1kHz, R = 10kΩ, V
or V = 1V
,
IN
L
NO_ _
S_
RMS
THD+N
0.014
%
or V = 2.5V
NO_ _
S_
Shunt switch on
Shunt switch off
-105
-80
V
or V = 1V
L
, f
=
NO_ _
S_
RMS IN
Off-Isolation (Note 7)
V
dB
dB
ISO(A)
20kHz, R = 10kΩ, S = GND
V
NO_ _
or V = 1V
, f = 20kHz,
= 10kΩ, three channels driven at 20kHz
S_
RMS IN
Channel-to-Channel Crosstalk
VIDEO PERFORMANCE
Off-Isolation (Note 7)
V
-97
TC(A)
R
L
/MAX4570
Shunt switch on
Shunt switch off
-74
-61
V
NO_ _
or V = 1V
, f
RMS IN
=
S_
V
ISO(V)
dB
dB
4MHz, R = 1kΩ, S = GND
L
V
NO_ _
or V = 1V
, f = 4MHz,
= 10kΩ, three channels driven at 4MHz
S_
RMS IN
Channel-to-Channel Crosstalk
V
-52
TC(V)
R
L
0.1dB Bandwidth
Off-Capacitance
BW
R
= 75Ω, R = 1kΩ
13
11
MHz
pF
SOURCE
L
C
f
IN
= 1MHz
OFF(NO)
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note 8)
Turn-On Time (Note 9)
Turn-Off Time (Note 9)
Break-Before-Make Time
t
V
or V = 1.5V, R = 5kΩ
400
160
100
900
500
ns
ns
ns
ONSD
NO_ _
S_
L
t
V
or V = 1.5V, R = 300Ω
OFFSD
NO_ _ S_ L
t
V
NO_ _
or V = 1.5V
10
13
BBM
S_
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 5)
Turn-On Time
t
V
NO_ _
or V = 1.5V, R = 5kΩ
43
14
ms
ms
ONSE
S_
L
Turn-Off Time
t
V
or V = 1.5V, R = 300Ω
OFFSE
NO_ _ S_ L
BIAS NETWORKS
Bias Network Resistance
R
BIASH to BIASL
20
27
kΩ
BIAS
ANALOG ELECTRICAL CHARACTERISTICS—Single +3V Supply
(V+ = +3V ±10%, V- = 0, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
A
MIN
MAX
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG SWITCHES
V
NO_ _
,
Analog Signal Range (Note 3)
On-Resistance
V
,
0
V+
V
COM_ _
V
S_
I
V
= 4mA,
COM_ _
T
= +25°C
106
180
220
A
R
or V = 1V,
Ω
ON
NO_ _
S_
T
A
= T to T
MIN MAX
V+ = 2.7V
4
_______________________________________________________________________________________
S e ria lly Co n t ro lle d , Du a l 4 x 2 , Clic k le s s
Au d io /Vid e o An a lo g Cro s s p o in t S w it c h e s
/MAX4570
INTERFACE I/O CHARACTERISTICS
(V+ = +2.7V to +5.5V, V- = 0 to -5.5V, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
A
MIN
MAX A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
AUXILIARY OUTPUTS
I
= 1mA to GND, V+ = 4.75V
= 0.5mA to GND, V+ = 2.7V
4.45
2.3
4.65
2.5
SOURCE
Output High Voltage
Output Low Voltage
V
V
V
OH
I
SOURCE
I
= 6mA, V+ = 2.7V
0.5
1.0
1.0
SINK
V
OL
I
= 12mA, V+ = 4.75V
0.5
SINK
DIGITAL INPUTS (SCK, DIN, CS, SCL, SDA)
V+ > 3.6V
V+ < 3.6V
V+ > 3.6V
V+ < 3.6V
3.0
2.0
Input High Voltage
Input Low Voltage
V
V
V
IH
0.8
0.6
V
IL
Input Hysteresis
V
0.2
0.01
5
V
HYST
Input Leakage Current (Note 7)
Input Capacitance
I
V
NO_ _
= 0 or 5V
-1
1
µA
pF
LEAK
C
NO
DIGITAL OUTPUTS (DOUT, SDA)
= 6mA
SINK
V+ = 4.75V
V+ = 2.7V
0.4
0.8
Output Low Voltage
V
I
V
V
OL
DOUT Output High Voltage
V
OH
I
= 0.5mA
V+ - 0.5 V+ - 0.1
SOURCE
I2C TIMING (V+ = +4.75V to +5.25V, Figures 1, 2)
SCL Clock Frequency
f
DC
1.3
400
0.9
kHz
µs
SCL
Bus Free Time between Stop
and Start Condition
t
BUF
STOP Condition Setup Time
Data Hold Time
t
0.6
0
µs
µs
ns
µs
µs
SU:STO
t
HD:DAT
Data Setup Time
t
100
1.3
0.6
SU:DAT
Clock Low Period
Clock High Period
t
LOW
t
HIGH
SCL/SDA Rise Time
(Note 12)
20 +
0.1Cb
300
300
t
ns
ns
R
SCL/SDA Fall Time
(Note 12)
20 +
0.1Cb
t
F
SPI TIMING (V+ = +4.75V to +5.25V, Figures 3, 4)
Operating Frequency
DIN to SCLK Setup
f
DC
2.1
MHz
ns
OP
f
DS
100
DIN to SCLK Hold
f
DH
0
ns
SCLK Fall to Output Data Valid
CS to SCLK Rise Setup
CS to SCLK Rise Hold
f
C
= 50pF
LOAD
20
100
0
200
ns
DO
f
ns
CSS
f
ns
CSH
_______________________________________________________________________________________
5
S e ria lly Co n t ro lle d , Du a l 4 x 2 , Clic k le s s
Au d io /Vid e o An a lo g Cro s s p o in t S w it c h e s
INTERFACE I/O CHARACTERISTICS (continued)
(V+ = +2.7V to +5.5V, V- = 0 to -5.5V, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Note 2)
MAX A
A
MIN
PARAMETER
SCLK Pulse Width Low
SCLK Pulse Width High
Rise Time (SCLK, DIN, CS)
Fall Time (SCLK, DIN, CS)
SYMBOL
CONDITIONS
MIN
200
200
TYP
MAX
UNITS
ns
t
CH
t
ns
CL
t
2.0
2.0
µs
R
t
µs
F
Note 2: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 3: Guaranteed by design. Not subject to production testing.
Note 4: ∆R
= R
- R
.
ON
ON(MAX)
ON(MIN)
Note 5: On-resistance flatness is defined as the difference between the maximum and minimum on-resistance values, as measured
over the specified analog signal range.
Note 6: Leakage parameters are 100% tested at maximum rated temperature, and guaranteed by correlation at T = +25°C.
A
Note 7: Off-isolation = 20 · log (V
/ V
NO_ _
), V
= output, V
= input to off switch.
COM_ __
COM_ _
NO_ _
Note 8: All timing is measured from the clock’s falling edge preceding the ACK signal for 2-wire, and from CS’s rising edge for
3-wire. Turn-Off Time is defined as the output of the switch for 0.5V change, tested with a 300Ω load to ground. Turn-On
Time is measured with a 5kΩ load resistor to GND. All timing is shown with respect to 20% of V+ and 70% of V+, unless
otherwise noted.
/MAX4570
Note 9: Typical values are for MAX4570 only.
Note 10: Supply current can be as high as 2mA per switch during switch transitions in the clickless mode, corresponding to 40mA
total supply transient current requirement.
Note 11: Leakage testing for single-supply operation is guaranteed by testing with dual supplies.
Note 12: Cb = capacitance of one bus line in pF. Tested with Cb = 400pF.
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(T = +25°C, unless otherwise noted.)
A
ON-RESISTANCE vs. V
ON-RESISTANCE vs. V
COM
ON-RESISTANCE vs. V
COM
COM
AND TEMPERATURE (DUAL SUPPLIES)
(SINGLE SUPPLY)
(DUAL SUPPLIES)
60
60
130
120
110
100
90
V± = ±5V
58
V+ = +2.7V
V± = ±2.7V
55
50
45
40
56
T = +85°C
A
54
52
T = +70°C
A
V± = ±3.3V
50
48
46
T = +25°C
A
80
V+ = +3.3V
70
V± = ±4.75V
44
42
40
35
30
V+ = +5V
60
T = -40°C
A
50
-5 -4 -3 -2 -1
0
1
2
3
4
5
-5 -4 -3 -2 -1
0
1
2
3
4
5
0
1
2
3
4
5
V
COM
(V)
V
COM
(V)
V
COM
(V)
6
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/MAX4570
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(T = +25°C, unless otherwise noted.)
A
ON-RESISTANCE vs. V
AND
COM
ON-RESISTANCE vs. TEMPERATURE
LEAKAGE CURRENT vs. TEMPERATURE
TEMPERATURE (SINGLE SUPPLY)
70
65
60
55
50
45
40
35
30
10,000
1000
75
70
65
60
55
V+ = +5V
V- = 0
V± = ±5V
T = +85°C
A
V+ = +5V
V- = 0
T = +70°C
A
NO_OFF
100
10
COM_ON
T = +25°C
A
V± = ±5V
50
45
40
COM_OFF
T = -40°C
A
1
0.1
0
1
2
3
4
5
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
V
COM
(V)
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY CURRENT vs. TEMPERATURE
(DUAL SUPPLIES)
SUPPLY CURRENT vs. TEMPERATURE
(SINGLE SUPPLY)
CHARGE INJECTION vs. V
COM
10
9
10
9
18
16
14
12
10
8
V+ = ±5V
V- = 0
I+
8
8
7
7
6
6
I-
V± = ±5V
V+ = +5V
5
5
4
3
4
3
6
4
V+ = +5V
V- = 0
V+ = +2.7V
2
1
2
1
2
0
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
-5 -4 -3 -2 -1
0
1
2
3
4
5
TEMPERATURE (°C)
TEMPERATURE (°C)
V
COM
(V)
TURN-ON/TURN-OFF TIMES vs.
SUPPLY VOLTAGE (DUAL SUPPLIES)
OFF-ISOLATION AND CROSSTALK
vs. FREQUENCY
TURN-ON/TURN-OFF TIMES vs.
SUPPLY VOLTAGE (SINGLE SUPPLY)
AMX4550/4570-12
1000
1200
1100
1000
900
800
700
600
500
400
300
200
10
0
-30
-40
V± = ±5V
900
800
700
-10
-20
-30
-40
-50
-60
-70
-80
OFF-ISOLATION
t
ON
t
ON
600
500
CROSSTALK
-50
-60
-90
-100
400
300
t
-70
-80
-110
-120
OFF
t
OFF
-90
-130
200
0.5 1
10
100
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
(V)
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
(V)
FREQUENCY (MHz)
V
V
SUPPLY
SUPPLY
_______________________________________________________________________________________
7
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Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(T = +25°C, unless otherwise noted.)
A
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
FREQUENCY RESPONSE
FREQUENCY RESPONSE
2
0.20
0.15
0.1
R
= 10kΩ
V± = ±5V
1
V± = ±5V
LOAD
V± = ±5V
0
-1
-2
-3
0.10
0.05
0
-0.05
0.01
-4
-5
-0.10
-0.15
-6
-7
-0.20
-0.25
-8
-0.30
0.001
0.5
1
10
100
500
0.5
1
2
5
10
20
/MAX4570
1
10
100
1000 10,000 100,000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (Hz)
COM FALL TIME (SOFT MODE)
COM RISE TIME (SOFT MODE)
COM TURN-ON TIME (HARD MODE)
V± = ±5V
V± = ±5V
V± = ±5V
CS
1V/div
200mV/
div
0
200mV/
div
COM
0.5V/div
0
0
0
500µs/div
500µs/div
50ns/div
COM TURN-OFF TIME (HARD MODE)
COM TURN-ON TIME (SOFT MODE)
COM TURN-OFF TIME (SOFT MODE)
V± = ±5V
V± = ±5V
V± = ±5V
CS
1V/div
CS
1V/div
CS
1V/div
0
0
0
COM
0.5V/div
COM
0.5V/div
COM
0.5V/div
0
0
0
25ns/div
5ms/div
5ms/div
8
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/MAX4570
P in De s c rip t io n
PIN
NAME
FUNCTION
MAX4550
MAX4570
Shunt Input to Crosspoint B. Use for shunt capacitor or AC ground connection to
improve off-isolation, or as an additional input to switch matrix B.
1
1
SB
2
3
2
3
NO3A
NO3B
Input 3 to Crosspoint A
Input 3 to Crosspoint B
High Side of Bias Network. Use to give the outputs a DC bias when inputs are
AC-coupled (refer to the Using the Internal Bias Resistors section).
4
5
4
5
BIASH
BIASL
Low Side of Bias Network. Use to give the outputs a DC bias when inputs are
AC-coupled (refer to the Using the Internal Bias Resistors section).
6
7
6
7
NO4A
NO4B
Input 4 to Crosspoint A
Input 4 to Crosspoint B
Positive Supply Voltage. Supply range is +2.7V to +5.25V. Connect pin 8 to pin 24 exter-
nally.
8, 24
8, 24
V+
9
9
COM2A
Q0
Output 2 of Crosspoint A
Auxiliary Output 0
10
11
12
13
10
11
12
—
COM2B
Q1
Output 2 of Crosspoint B
Auxiliary Output 1
A0
LSB+1 of 2-Wire Serial-Interface Address Field
Chip Select of 3-Wire Interface. Logic low on CS enables serial data to be clocked in to
device. Programming commands are executed on CS’s rising edge.
—
13
CS
14
—
15
—
16
—
14
—
15
—
SCL
SCLK
SDA
DIN
2-Wire Serial-Interface Clock Input
3-Wire Serial-Interface Clock Input
2-Wire Serial-Interface Data Input. Data is clocked in on SCL’s rising edge.
3-Wire Serial-Interface Data Input. Data is clocked in on SCLK’s rising edge.
LSB+2 of 2-Wire Serial-Interface Address Field
A1
Data Output of 3-Wire Interface. Input data is clocked out and SCLK’s falling edge
delayed by 16 clock cycles. DOUT remains active when CS is high.
—
16
DOUT
17
18
19
20
21
22
23
25
26
27
17
18
19
20
21
22
23
25
26
27
Q2
COM1B
Q3
Auxiliary Output 2
Output 1 of Crosspoint A
Auxiliary Output 3
COM1A
GND
Output 1 of Crosspoint A
Ground
NO1A
NO1B
V-
Input 1 to Crosspoint A
Input 1 to Crosspoint B
Negative Supply Voltage. Supply range is from -5.25V to 0.
Input 2 to Crosspoint A
Input 2 to Crosspoint B
NO2A
NO2B
Shunt Input to Crosspoint A. Use for shunt capacitor or AC ground connection to
improve off-isolation, or as an additional input to switch matrix A.
28
28
SA
_______________________________________________________________________________________
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A logic “1” in any bit position of the data byte makes
De t a ile d De s c rip t io n
that function active, while a logic “0” makes it inactive.
Tables 1–4 describe the command byte and the corre-
sponding data byte. For example, if bit C4 of the com-
mand byte is set, the subsequent data byte programs
the state of the auxiliary outputs. If bits D0 and D2 of
the subsequent data byte are set, Q0 and Q2 outputs
are set high. If more than one bit of the command byte
is set, the data byte programs all of the corresponding
blocks. This operation is useful, for instance, to simulta-
neously set both switch matrices to the same configura-
tion. Any block that is not selected in the command
byte remains unchanged.
The MAX4550/MAX4570 are serial-interface, program-
mable, dual 4x2 audio/video crosspoint switches. Each
d e vic e c onta ins two ind e p e nd e nt 4x2 c ros s p oint
switches, controlled through the on-chip serial inter-
face. The MAX4550 uses a 2-wire I2C-compatible serial
communications protocol, while the MAX4570 uses a
3-wire SPI/QSPI/MICROWIRE-compatible serial com-
munications protocol.
These ICs include four controllable auxiliary outputs,
each capable of sourcing 1mA or sinking 12mA. Also
included are four selectable bias-resistor networks (one
for each output) for use with AC-coupled input signals.
Both devices operate with either ±5V dual supplies or a
single +5V supply, and are optimized for use in the
audio frequency range to 20kHz and at video frequen-
cies up to 4MHz. They feature 80Ω on-resistance, 10Ω
on-re s is ta nc e ma tc hing b e twe e n c ha nne ls , 5Ω on-
resistance flatness, and as low as 0.004% total harmon-
ic distortion.
Table 1. Command-Byte Format
BIT
REGISTER
C7
C6
C5
C4
C3
C2
C1
C0
Don’t care
Don’t care
BIAS/MODE
AUX
/MAX4570
The MAX4550/MAX4570 offer better than -110dB of
audio off-isolation, -95dB of audio crosstalk, -78dB of
vid e o off-is ola tion, a nd -54d B of vid e o c ros s ta lk
(4MHz). The SA and SB (shunt) inputs further improve
off-isolation, allowing for the addition of external shunt
capacitors or the connection of outputs to AC grounds.
These devices feature a clickless operation mode for
noiseless audio switching. Clickless or standard switch-
ing mode is selectable for each individual output using
the serial interface.
COM2B
COM1B
COM2A
COM1A
Table 2. COM Data-Byte Format
(C0, C1, C2, C3 = “1”)
__________ Ap p lic a t io n s In fo rm a t io n
BIT
DESCRIPTION
The MAX4550/MAX4570 are divided into five functional
b loc ks : the c ontrol-log ic b loc k, two s witc h-ma trix
blocks, the bias-resistor block, and the auxiliary-output
block (see Functional Diagram). The control-logic block
accepts commands via the serial interface and uses
those commands to control the four remaining blocks.
D7
D6
D5
Don’t care
Don’t care
Don’t care
Controls the switch connected to S_ ;
1 = close switch, 0 = open switch.
D4
D3
D2
D1
D0
Co m m a n d -Byt e a n d Da t a -Byt e
P ro g ra m m in g
Controls the switch connected to NO4_ ;
1 = close switch, 0 = open switch.
The devices are programmed through their serial inter-
face with a command byte followed by a data byte.
Each bit of the command byte selects one of the func-
tional blocks to be controlled by the subsequent data
b yte . The d a ta b yte s e ts the s ta te of the s e le c te d
block(s). For the two switch-matrix blocks, the data
byte sets the switch state. For the bias-resistor block,
the data byte controls which bias network is active. For
the auxiliary-output block, the data byte programs the
s ta te of the four a uxilia ry outp uts (s e e Func tiona l
Diagram).
Controls the switch connected to NO3_ ;
1 = close switch, 0 = open switch.
Controls the switch connected to NO2_ ;
1 = close switch, 0 = open switch.
Controls the switch connected to NO1_ ;
1 = close switch, 0 = open switch.
10 ______________________________________________________________________________________
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/MAX4570
The 2-wire serial interface requires only two I/O lines of
Table 3. AUX_ Data-Byte Format (C4 = “1”)
a standard microprocessor port. Figures 1 and 2 detail
the timing diagram for signals on the 2-wire bus, and
Table 5 details the format of the signals. The MAX4550
is a receive-only device and must be controlled by a
bus master device. A bus master device communicates
by transmitting the address byte of the slave device
over the bus and then transmitting the desired informa-
tion. Each transmission consists of a start condition, the
MAX4550’s programmable slave-address byte, a com-
mand-byte, a data-byte, and finally a stop condition.
The slave device acknowledges the recognition of its
address by pulling the SDA line low for one clock peri-
od after the address byte is transmitted. The slave
device also issues a similar acknowledgment after the
command byte and again after the data byte.
BIT
DESCRIPTION
D7
D6
D5
Don’t care
Don’t care
Don’t care
D4
D3
D2
D1
D0
Don’t care
Controls output Q3; 1 = set output high,
0 = set output low.
Controls output Q2; 1 = set output high,
0 = set output low.
Controls output Q1; 1 = set output high,
0 = set output low.
Controls output Q0; 1 = set output high,
0 = set output low.
Start and Stop Conditions
The bus-master signals the beginning of a transmission
with a start condition by transitioning SDA from high to
low while SCL is high. When the master has finished
communicating with the slave, it issues a stop condition
by transitioning SDA from low to high while SCL is high.
The bus is then free for another transmission.
Table 4. Clickless Mode/BIAS_ Data-Byte
Format (C5 = “1”)
BIT
DESCRIPTION
Controls COM2B clickless mode; 1 = enables
clickless mode, 0 = disables clickless mode.
Slave Address (Address Byte)
The MAX4550 uses an 8-bit-long slave address. To
select a slave address, connect A0 and A1 to V+ or
GND. The MAX4550 has four possible slave addresses,
thus a maximum of four of these devices may share the
same 2-bit address bus. The slave device (MAX4550)
monitors the serial bus continuously, waiting for a start
condition followed by an address byte. When a slave
D7
Controls COM1B clickless mode; 1 = enables
clickless mode, 0 = disables clickless mode.
D6
D5
D4
D3
D2
D1
D0
Controls COM2A clickless mode; 1 = enables
clickless mode, 0 = disables clickless mode.
Controls COM1A clickless mode; 1 = enables
clickless mode, 0 = disables clickless mode.
d e vic e re c og nize s its a d d re s s (10011A A 0), it
1
0
Controls COM2B bias resistors; 1 = connect bias
resistors, 0 = disconnect bias resistors.
acknowledges that it is ready for further communication
by pulling the SDA line low while SCL is high.
Controls COM1B bias resistors; 1 = connect bias
resistors, 0 = disconnect bias resistors.
3 -Wire S e ria l In t e rfa c e
The MAX4570 3-wire s e ria l inte rfa c e is SPI/
QSPI/MICROWIRE-c omp a tib le . An a c tive -low c hip -
select (CS) input enables the device to receive data
from the serial input (DIN). Data is clocked in on the ris-
ing edge of the serial-clock (SCLK) signal. A total of 16
bits are needed in each write cycle. Segmented write
c yc le s a re a llowe d (two 8-b it-wid e tra ns fe rs ) if CS
remains low. The first bit clocked into the MAX4550 is
the command byte’s MSB, and the last bit clocked in is
the data byte’s LSB. While shifting data, the device
remains in its original configuration. After all 16 bits are
clocked into the input shift register, a rising edge on CS
latches the data into the MAX4570 internal registers,
initiating the device’s change of state.
Controls COM2A bias resistors; 1 = connect bias
resistors, 0 = disconnect bias resistors.
Controls COM1A bias resistors; 1 = connect bias
resistors, 0 = disconnect bias resistors.
2 -Wire S e ria l In t e rfa c e
The MAX4550 uses a 2-wire, fast-mode, I2C-compatible
serial interface. This protocol consists of an address
byte followed by the command and data bytes. To
a d d re s s a g ive n c hip , the A0 a nd A1 b its in the
address byte must duplicate the values present at the
A0 and A1 pins of that chip. The rest of the address
bits control MAX4550 operation. The command and
data-byte details are described in the Command-Byte
and Data-Byte Programming section.
______________________________________________________________________________________ 11
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Table 5. 2-Wire Serial-Interface Data Format
ADDRESS BYTE
COMMAND BYTE
DATA BYTE
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
C
7
C
6
C
5
C
4
C
3
C
2
C
1
C
0
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
S
R
T
1
0
0
1
1
A
1
A
0
0
A
C
K
X
X
B
I
A
S
A
U
X
C
O
M
2
C
O
M
1
C
O
M
2
C
O
M
1
A
C
K
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
A
C
K
S
T
O
P
B
B
A
A
X = Don’t care
SRT = Start condition
ACK = Acknowledge condition
STOP = Stop condition
/MAX4570
SCL
SDA
A7
A0
D7
D0
D7
D0
SRT
ACK
ACK
ACK
STOP
Figure 1. 2-Wire Serial-Interface Timing Diagram
A
B
C
D
E
F
G
H
I
J
t
t
LOW HIGH
SCL
SDA
t
t
t
t
HD:STA
SU:STA
SU:DAT
HD:DAT
t
t
SU:STO
BUF
A = START CONDITION
F = LSB OF COMMAND BYTE
B = MSB OF ADDRESS BYTE
C = LSB OF ADDRESS BYTE
G = ACKNOWLEDGE CLOCKED INTO MASTER
H = MSB OF DATA BYTE
D = ACKNOWLEDGE CLOCKED INTO MASTER
E = MSB OF COMMAND BYTE
I = LSB OF DATA BYTE
J = ACKNOWLEDGE CLOCKED INTO MASTER
Figure 2. 2-Wire Serial-Interface Timing Details
12 ______________________________________________________________________________________
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/MAX4570
Fig ure s 3, 4, a nd Ta b le 6 s how the d e ta ils of the
Daisy Chaining
To p rog ra m s e ve ra l MAX4570s , “d a is y c ha in” the
devices by connecting DOUT of the first device to DIN of
the second, and so on. The CS pins of all devices are
connected together, and data is shifted through the
MAX4570s in series. 16 bits of data per device are
required for proper programming of all devices. When
CS is brought high, all devices are updated simultane-
ously.
3-wire protocol, as it applies to the MAX4570. DOUT is
the shift register’s output. Data at DOUT is simply the
inp ut d a ta d e la ye d b y 16 c loc k c yc le s , with d a ta
a p p e a ring s ync hronous with SCLK’s fa lling e d g e .
Transitions at DIN and SCLK have no effect when CS is
high, and DOUT holds the last bit in the shift register.
CS
SCLK
1
C7
16
DIN
C0 D7
D0
COMMAND BYTE
DATA BYTE
Figure 3. 3-Wire Serial-Interface Communication
• • •
CS
t
t
CH
t
CSH
CSS
t
t
CL
CSH
SCLK
• • •
t
DS
t
DH
DIN
• • •
t
DV
t
DO
t
TR
DOUT
• • •
Figure 4. 3-Wire Serial-Interface Timing Details
______________________________________________________________________________________ 13
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Table 6. 3-Wire Serial-Interface Data Format
COMMAND BYTE
DATA BYTE
MSB
C7
LSB
D0
C6
X
C5
C4
C3
C2
C1
C0
D7
D6
D6
D5
D5
D4
D4
D3
D3
D2
D2
D1
D1
X
BIAS
AUX COM2B
COM1B
COM2A
COM1A D7
D0
X = Don’t care
Addressable Serial Interface
Us in g t h e Au x ilia ry Ou t p u t s
To program several MAX4570s individually using a sin-
gle processor, connect DIN of each MAX4570 together
and control CS on each MAX4570 separately. To select
a particular device, drive the corresponding CS low,
clock in the 16-bit command, then drive CS high and
execute the command. Typically, only one MAX4570 is
addressed at a time.
The four auxiliary outputs provide a way to control
external circuitry, such as LEDs or other DC loads,
through the serial interface. Program these outputs via
bit C4 of the command byte. Each output is capable of
sourcing 1mA or sinking 12mA. They are programmed
through the command byte and data byte (refer to
Tables 1, 3, and the Functional Diagram).
/MAX4570
Im p ro vin g Off-Is o la t io n
To improve off-isolation, connect the SA or SB input to
ground either directly (DC ground) or through capaci-
tors (AC ground). Closing SA or SB effectively grounds
the unused outputs.
Clic k le s s S w it c h in g
Audible switching transients (“clicks”) are eliminated in
this mode of operation. When an output is configured
as “clickless,” the gate signal of the switches connect-
ed to that output are controlled with slow-moving volt-
ages. As a result, the output slew rates are significantly
reduced. Program clickless operation via bit C5 of the
command byte (refer to Tables 1, 4, and the Functional
Diagram). Each operating switch may draw as much as
2mA during transition.
Us in g t h e In t e rn a l Bia s Re s is t o rs
Us e the inte rna l b ia s -re s is tor ne tworks to g ive the
switch outputs a DC bias when the switch terminals are
AC coupled. Programming of the switches that connect
the bias resistors to the outputs is accomplished via bit
C5 of the c omma nd b yte . Conne c t the BIASH a nd
BIASL inputs to DC levels (for example, V+ and GND),
and activate the switch connecting the appropriate out-
P o w e r-Up S t a t e
The MAX4550/MAX4570 feature a preset power-up
state. Upon power-up, COM1A and COM2A are con-
nected to SA, COM1B and COM2B are connected to
SB, all outputs are set to clickless mode, all bias-resis-
tor networks are disconnected from the outputs, and all
auxiliary outputs are low. All other switches are open.
put. This applies a voltage midway between V
BIASH
and V
to the output (refer to Tables 1, 4, and the
BIASL
Functional Diagram).
14 ______________________________________________________________________________________
S e ria lly Co n t ro lle d , Du a l 4 x 2 , Clic k le s s
Au d io /Vid e o An a lo g Cro s s p o in t S w it c h e s
/MAX4570
Fu n c t io n a l Dia g ra m
22
26
NO1A
NO2A
NO3A
NO4A
SA
MAX4550
MAX4570
2
6
28
20
9
COM1A
COM2A
SWITCH MATRIX ‘A’
23
27
3
NO1B
NO2B
NO3B
NO4B
SB
7
1
18
11
COM1B
COM2B
SWITCH MATRIX ‘B’
8, 24
25
V+
V-
4
BIASH
21
GND
10
10
4
15
14
13
16
SDA/(DIN)
SCL/(SCLK)
A0/(CS)
5
CONTROL
LOGIC
BIASL
BIAS RESISTOR NETWORK
A1/(DOUT)
4
10
12
17
19
Q0
Q1
Q2
Q3
AUXILIARY OUTPUTS
SWITCH STATES SHOWN IN POWER-UP STATE.
AUXILIARY OUTPUTS ARE LOW IN POWER-UP STATE.
( ) ARE FOR MAX4570
______________________________________________________________________________________ 15
S e ria lly Co n t ro lle d , Du a l 4 x 2 , Clic k le s s
Au d io /Vid e o An a lo g Cro s s p o in t S w it c h e s
P a c k a g e In fo rm a t io n
/MAX4570
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
16 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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