MAXIM MAX4570CWI

19-1397; Rev 0; 10/98
KIT
ATION
EVALU
E
L
B
AVAILA
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
The MAX4550/MAX4570 serial-interface, programmable, 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 additional crosspoint inputs SA and SB as shunts. Each output is selectively programmable for clickless or regular
mode operation. A set of internal resistive voltagedividers 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 onresistance flatness, and 0.014% total harmonic distortion. 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 2C-compatible serial interface, while the MAX4570
uses a 3-wire SPI™/QSPI™ or MICROWIRE™-compatible 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.
Applications
Set-Top Boxes
PC Multimedia Boards
Features
♦ 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
♦ -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
Pin Configuration
TOP VIEW
High-End Audio Systems
Video Conferencing Systems
Ordering Information
NO3A 2
27 NO2B
NO3B 3
26 NO2A
BIASH 4
25 V-
TEMP. RANGE
PIN-PACKAGE
MAX4550CAI
0°C to +70°C
28 SSOP
MAX4550CWI
MAX4550EAI
MAX4550EWI
MAX4570CAI
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
28 Wide SO
28 SSOP
28 Wide SO
28 SSOP
MAX4570CWI
MAX4570EAI
MAX4570EWI
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
28 Wide SO
28 SSOP
28 Wide SO
I2C is a trademark of Philips Corp.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
24 V+
BIASL 5
NO4A 6
PART
28 SA
SB 1
MAX4550
MAX4570
23 NO1B
22 NO1A
NO4B 7
21 GND
V+ 8
20 COM1A
COM2A 9
19 Q3
Q0 10
18 COM1B
COM2B 11
17 Q2
Q1 12
A0 (CS) 13
16 A1 (DOUT)
SCL (SCLK) 14
15 SDA (DIN)
SO/SSOP
( ) ARE FOR MAX4570.
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.
MAX4550/MAX4570
General Description
MAX4550/MAX4570
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
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 (TA = +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 maximum 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%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V+
V
ANALOG SWITCHES
Analog Signal Range (Note 3)
On-Resistance
COM_ _ to NO_ _ or S_
On-Resistance Match Between
Channels (Note 4)
VNO_ _,
VCOM_ _,
VS_
RON
∆RON
VICOM_ _ = 4mA,
VNO_ _ or VS_ = ±3.0V,
V+ = 4.75V, V- = -4.75V
TA = +25°C
ICOM_ _ = 4mA,
VNO_ _ or VS_ = ±3.0V,
V+ = 4.75V, V- = -4.75V
TA = +25°C
43
TA = TMIN to TMAX
ICOM_ _ = 4mA;
TA = +25°C
∆RFLAT(ON) VNO_ _ or VS_ = ±3.0V, 0;
TA = TMIN to TMAX
V+ = 4.75V; V- = -4.75V
NO_ _ or S_ Off-Leakage
Current (Note 6)
NO_(OFF)
COM_ _ Off-Leakage Current
(Note 6)
ICOM_(OFF)
COM_ _ On-Leakage Current
(Note 6)
ICOM_(ON)
Ω
100
5
TA = TMIN to TMAX
COM_ _ to NO_ _ or S_
On-Resistance Flatness
(Note 5)
80
10
Ω
10
4
5
Ω
8
VNO_ _ or VS_ = ±4.5V,
– 4.5V,
VCOM_ = +
V+ = 5.25V, V- = -5.25V
TA = +25°C
-1
TA = TMIN to TMAX
-10
VNO_ _ or VS_ = ±4.5V,
– 4.5V,
VCOM_ = +
V+ = 5.25V, V- = -5.25V
TA = +25°C
-5
TA = TMIN to TMAX
-10
VNO_ _ or VS_ = floating,
VCOM_ = ±4.5V,
V+ = 5.25V, V- = -5.25V
TA = +25°C
-5
TA = TMIN to TMAX
-20
0.01
1
nA
10
0.01
5
nA
10
0.01
5
nA
20
AUDIO PERFORMANCE
Total Harmonic Distortion plus
Noise
THD+N
fIN = 1kHz, RL = 1kΩ, VNO_ or VS_ = 1VRMS,
VNO_ or VS_ = 0
Off-Isolation (Note 7)
VISO(A)
VNO = 1VRMS, fIN = 20kHz,
RL = 10kΩ, S = GND
Channel-to-Channel Crosstalk
Channel-to-Channel Crosstalk
VCTA(A)
VCTA(A)
ICOM_
_ =VS_
1mA
VNO_ _ or
= 1VRMS, fIN = 20kHz,
RL = 10kΩ, three channels driven at 20kHz
2
0.014
Shunt switch on
-110
Shunt switch off
-80
-95
_______________________________________________________________________________________
%
dB
dB
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
(V+ = +5V ±5%, V- = -5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VIDEO PERFORMANCE
Off-Isolation
VISO(V)
Channel-to-Channel Crosstalk
VCT(V)
0.1dB Bandwidth
BW
Off-Capacitance
COFF(NO)
VNO_ _ or VS_ = 1VRMS,
fIN = 4MHz, RL = 1kΩ,
S_ = GND
Shunt switch on
-78
Shunt switch off
-63
dB
VNO_ _ or VS_ = 1VRMS, fIN = 4MHz,
RL = 10Ω, three channels driven at 4MHz
-54
dB
RS = 75Ω, RL = 1kΩ
14
MHz
fIN = 1MHz,
11
pF
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note 8)
Turn-On Time (Note 9)
tONSD
VNO_ _ or VS_ = 1.5V, RL = 5kΩ
Turn-Off Time (Note 9)
tOFFSD
VNO_ _ or VS_ = 1.5V, RL = 300Ω
Break-Before-Make Time
tBBM
VNO_ _ or VS_ = 1.5V
10
400
900
ns
200
500
ns
100
ns
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 5)
Turn-On Time
tONSE
VNO_ _ or VS_ = 1.5V, RL = 5kΩ
36
ms
Turn-Off Time
tOFFSE
VNO_ _ or VS_ = 1.5V, RL = 300Ω
11
ms
RBIAS
BIASH to BIASL
BIAS NETWORKS
Bias Network Resistance
13
20
27
kΩ
5.25
0
V
20
µA
-20
µA
MAX
UNITS
V+
V
POWER SUPPLIES
Supply Voltage Range
V+
V-
2.7
-5.25
V+ Supply Current (Note 10)
I+
Reset condition, V+ = 2.7V to 5.25V
V- Supply Current
I-
Reset condition, V- = -5.25V to 0
7
ANALOG ELECTRICAL CHARACTERISTICS—Single +5V Supply
(V+ = +5V ±5%, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
ANALOG SWITCHES
Analog Signal Range (Note 3)
On-Resistance
VNO_ _,
VCOM_ _,
VS_
ICOM_ _ = 4mA,
VNO_ _ or VS_ = 3.0V,
V+ = 4.75V
TA = +25°C
ICOM_ _ = 4mA,
VNO_ _ or VS_ = 3.0V,
V+ = 4.75V
TA = +25°C
ICOM_ _ = 4mA;
VNO_ _ or VS_ = 1V, 2V,
3V; V+ = 4.75V
TA = +25°C
VNO or VS_ = 4.5V, 1V;
INO_ _(OFF) VCOM_ _ = 1V, 4.5V;
V+ = 5.25V
TA = +25°C
-1
TA = TMIN to TMAX
-10
RON
On-Resistance Match Between
Channels (Note 4)
∆RON
On-Resistance Flatness
(Note 5)
RFLAT
NO_ _ or S_ Off-Leakage
Current (Notes 6, 11)
0
60
TA = TMIN to TMAX
100
Ω
130
5
TA = TMIN to TMAX
10
Ω
10
4
TA = TMIN to TMAX
10
Ω
15
0.01
1
nA
10
_______________________________________________________________________________________
3
MAX4550/MAX4570
ANALOG ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
MAX4550/MAX4570
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
ANALOG ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)
(V+ = +5V ±5%, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
0.01
5
COM_ _ Off-Leakage Current
(Notes 6, 11)
VNO_ _ or VS_ = 4.5V, 1V;
ICOM_ _(OFF) VCOM_ _ = 1V, 4.5V;
V+ = 5.25V
TA = +25°C
-5
TA = TMIN to TMAX
-10
COM_ _ On-Leakage Current
(Notes 6, 11)
VNO_ _ or VS_ = floating;
ICOM_ _(ON) VCOM_ _ = 1V, 4.5V;
V+ = 5.25V
TA = +25°C
-5
TA = TMIN to TMAX
-20
UNITS
nA
10
0.01
5
nA
20
AUDIO PERFORMANCE
Total Harmonic Distortion plus
Noise
THD+N
fIN = 1kHz, RL = 10kΩ, VNO_ _ or VS_ = 1VRMS,
VNO_ _ or VS_ = 2.5V
0.014
Off-Isolation (Note 7)
VISO(A)
VNO_ _ or VS_ = 1VRMS, fIN =
20kHz, RL = 10kΩ, S = GND
Shunt switch on
-105
Shunt switch off
-80
Channel-to-Channel Crosstalk
VTC(A)
VNO_ _ or VS_ = 1VRMS, fIN = 20kHz,
RL = 10kΩ, three channels driven at 20kHz
Off-Isolation (Note 7)
VISO(V)
VNO_ _ or VS_ = 1VRMS, fIN =
4MHz, RL = 1kΩ, S = GND
Channel-to-Channel Crosstalk
VTC(V)
VNO_ _ or VS_ = 1VRMS, fIN = 4MHz,
RL = 10kΩ, three channels driven at 4MHz
-52
dB
RSOURCE = 75Ω, RL = 1kΩ
13
MHz
fIN = 1MHz
11
pF
%
dB
-97
dB
VIDEO PERFORMANCE
0.1dB Bandwidth
BW
Off-Capacitance
COFF(NO)
Shunt switch on
-74
Shunt switch off
-61
dB
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note 8)
Turn-On Time (Note 9)
tONSD
VNO_ _ or VS_ = 1.5V, RL = 5kΩ
400
900
ns
Turn-Off Time (Note 9)
tOFFSD
VNO_ _ or VS_ = 1.5V, RL = 300Ω
160
500
ns
Break-Before-Make Time
tBBM
VNO_ _ or VS_ = 1.5V
10
100
ns
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 5)
Turn-On Time
tONSE
VNO_ _ or VS_ = 1.5V, RL = 5kΩ
43
ms
Turn-Off Time
tOFFSE
VNO_ _ or VS_ = 1.5V, RL = 300Ω
14
ms
RBIAS
BIASH to BIASL
BIAS NETWORKS
Bias Network Resistance
13
20
27
kΩ
MAX
UNITS
V+
V
ANALOG ELECTRICAL CHARACTERISTICS—Single +3V Supply
(V+ = +3V ±10%, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
ANALOG SWITCHES
Analog Signal Range (Note 3)
On-Resistance
4
VNO_ _,
VCOM_ _,
VS_
RON
0
ICOM_ _ = 4mA,
VNO_ _ or VS_ = 1V,
V+ = 2.7V
TA = +25°C
106
TA = TMIN to TMAX
_______________________________________________________________________________________
180
220
Ω
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
(V+ = +2.7V to +5.5V, V- = 0 to -5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
ISOURCE = 1mA to GND, V+ = 4.75V
4.45
4.65
ISOURCE = 0.5mA to GND, V+ = 2.7V
2.3
2.5
MAX
UNITS
AUXILIARY OUTPUTS
Output High Voltage
VOH
Output Low Voltage
VOL
V
ISINK = 6mA, V+ = 2.7V
0.5
1.0
ISINK = 12mA, V+ = 4.75V
0.5
1.0
V
DIGITAL INPUTS (SCK, DIN, CS, SCL, SDA)
Input High Voltage
VIH
Input Low Voltage
VIL
Input Hysteresis
VHYST
Input Leakage Current (Note 7)
ILEAK
Input Capacitance
CNO
V+ > 3.6V
3.0
V+ < 3.6V
2.0
V
V+ > 3.6V
0.8
V+ < 3.6V
0.6
0.2
VNO_ _ = 0 or 5V
-1
0.01
V
V
1
5
µA
pF
DIGITAL OUTPUTS (DOUT, SDA)
Output Low Voltage
VOL
ISINK = 6mA
ISINK = 6mA
DOUT Output High Voltage
VOH
ISOURCE = 0.5mA
V+ = 4.75V
0.4
V+ = 2.7V
0.8
V+ - 0.5 V+ - 0.1
V
V
I2C TIMING (V+ = +4.75V to +5.25V, Figures 1, 2)
SCL Clock Frequency
fSCL
DC
Bus Free Time between Stop
and Start Condition
400
kHz
tBUF
1.3
STOP Condition Setup Time
tSU:STO
0.6
Data Hold Time
tHD:DAT
0
Data Setup Time
tSU:DAT
100
ns
Clock Low Period
tLOW
1.3
µs
Clock High Period
tHIGH
0.6
µs
SCL/SDA Rise Time
(Note 12)
tR
20 +
0.1Cb
300
SCL/SDA Fall Time
(Note 12)
tF
20 +
0.1Cb
300
2.1
µs
µs
0.9
µs
ns
ns
SPI TIMING (V+ = +4.75V to +5.25V, Figures 3, 4)
Operating Frequency
fOP
DC
DIN to SCLK Setup
fDS
100
DIN to SCLK Hold
fDH
CLOAD = 50pF
20
MHz
ns
0
ns
200
ns
SCLK Fall to Output Data Valid
fDO
CS to SCLK Rise Setup
fCSS
100
ns
CS to SCLK Rise Hold
fCSH
0
ns
_______________________________________________________________________________________
5
MAX4550/MAX4570
INTERFACE I/O CHARACTERISTICS
INTERFACE I/O CHARACTERISTICS (continued)
(V+ = +2.7V to +5.5V, V- = 0 to -5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SCLK Pulse Width Low
tCH
200
SCLK Pulse Width High
tCL
200
Rise Time (SCLK, DIN, CS)
tR
2.0
µs
Fall Time (SCLK, DIN, CS)
tF
2.0
µs
ns
ns
The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Guaranteed by design. Not subject to production testing.
∆RON = RON(MAX) - RON(MIN).
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 TA = +25°C.
Note 7: Off-isolation = 20 · log (VCOM_ __ / VNO_ _ ), VCOM_ _ = output, VNO_ _ = input to off switch.
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.
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.
Note 2:
Note 3:
Note 4:
Note 5:
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
V± = ±2.7V
V± = ±5V
55
TA = +85°C
54
120
V± = ±3.3V
50
TA = +70°C
45
TA = +25°C
40
46
100
90
80
V+ = +3.3V
70
V± = ±4.75V
44
RON (Ω)
RON (Ω)
52
V+ = +2.7V
110
50
48
35
V+ = +5V
60
42
TA = -40°C
30
40
-5
-4
-3
-2
-1
0
1
VCOM (V)
6
130
AMX4550/4570-03
58
AMX4550/4570-02
60
AMX4550/4570-01
60
56
ON-RESISTANCE vs. VCOM
(SINGLE SUPPLY)
ON-RESISTANCE vs. VCOM
AND TEMPERATURE (DUAL SUPPLIES)
ON-RESISTANCE vs. VCOM
(DUAL SUPPLIES)
RON (Ω)
MAX4550/MAX4570
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
2
3
4
5
50
-5
-4
-3
-2
-1
0
1
VCOM (V)
2
3
4
5
0
1
2
3
VCOM (V)
_______________________________________________________________________________________
4
5
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
MAX4550/MAX4570
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
65
TA = +25°C
55
55
50
45
V± = ±5V
50
40
TA = -40°C
45
COM_ON
10
COM_OFF
1
30
1
2
3
4
5
0.1
-40
-20
0
20
40
60
-40
80
VCOM (V)
TEMPERATURE (°C)
SUPPLY CURRENT vs. TEMPERATURE
(DUAL SUPPLIES)
SUPPLY CURRENT vs. TEMPERATURE
(SINGLE SUPPLY)
7
6
I-
5
4
3
8
12
6
V+ = +5V
5
4
10
6
2
2
0
40
60
80
-40
-20
TEMPERATURE (°C)
TURN-ON/TURN-OFF TIMES vs.
SUPPLY VOLTAGE (DUAL SUPPLIES)
800
40
60
80
500
400
tOFF
300
200
2.7
3.1
3.5
3.9
4.3
VSUPPLY (V)
4.7
5.1
5.5
0
1
2
3
4
OFF-ISOLATION AND CROSSTALK
vs. FREQUENCY
1000
800
tON
700
0
600
5
AMX4550/4570-12
10
-30
V± = ±5V
-40
-50
-10
CROSSTALK (dB)
600
-2 -1
TURN-ON/TURN-OFF TIMES vs.
SUPPLY VOLTAGE (SINGLE SUPPLY)
1100
TIME (ns)
tON
-3
VCOM (V)
900
700
-5 -4
AMX4550/4570-10
900
20
TEMPERATURE (°C)
1200
AMX4550/4570-11
1000
0
V+ = +5V
V- = 0
4
V+ = +2.7V
1
20
V± = ±5V
8
2
0
80
14
1
-20
60
16
7
3
-40
40
CHARGE INJECTION vs. VCOM
Q (pC)
SUPPLY CURRENT (µA)
I+
8
V- = 0
9
20
18
AMX4550/4570-08
V+ = ±5V
9
0
TEMPERATURE (°C)
10
AMX4550/4570-07
10
-20
AMX4550/4570-09
0
SUPPLY CURRENT (µA)
NO_OFF
100
35
40
TIME (ns)
V± = ±5V
1000
-20
-60
OFF-ISOLATION
-70
-30
-80
-40
CROSSTALK
-50
-90
500
-60
-100
400
-70
-110
300
-80
-120
200
-90
tOFF
2.7
3.1
3.5
3.9
4.3
VSUPPLY (V)
4.7
5.1
5.5
-130
0.5 1
10
100
FREQUENCY (MHz)
_______________________________________________________________________________________
7
ISOLATION (dB)
RON (Ω)
60
V+ = +5V
V- = 0
60
TA = +70°C
65
RON (Ω)
V+ = +5V
V- = 0
10,000
LEAKAGE CURRENT (pA)
TA = +85°C
LEAKAGE CURRENT vs. TEMPERATURE
AMX4550/4570-05
70
ON-RESISTANCE vs. TEMPERATURE
70
AMX4550/4570-04
75
AMX4550/4570-06
ON-RESISTANCE vs. VCOM AND
TEMPERATURE (SINGLE SUPPLY)
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
V± = ±5V
0
V± = ±5V
0.15
0.10
-1
0.1
AMX4550/4570-14
0.20
AMX4550/4570-13
2
1
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
FREQUENCY RESPONSE
AMX4550/4570-15
FREQUENCY RESPONSE
RLOAD = 10kΩ
V± = ±5V
-3
-4
0
-0.05
-0.10
-5
-0.15
-6
-0.20
-7
-0.25
-8
THD+NOISE (%)
0.05
-2
LOSS (dB)
-0.30
1
10
100
500
0.5
1
2
5
10
20
0.01
0.001
1
10
100
1000
10,000
100,000
FREQUENCY (MHz)
FREQUENCY (Hz)
COM RISE TIME (SOFT MODE)
COM FALL TIME (SOFT MODE)
COM TURN-ON TIME (HARD MODE)
V± = ±5V
V± = ±5V
200mV/
div
200mV/
div
AMX4550/4570-18
FREQUENCY (MHz)
AMX4550/4570-16
0.5
AMX4550/4570-17
LOSS (1dB/div)
V± = ±5V
CS
1V/div
0
COM
0.5V/div
0
500µs/div
COM TURN-OFF TIME (HARD MODE)
COM TURN-ON TIME (SOFT MODE)
V± = ±5V
CS
1V/div
0
50ns/div
COM TURN-OFF TIME (SOFT MODE)
AMX4550/4570-20
500µs/div
V± = ±5V
CS
1V/div
AMX4550/4570-21
0
AMX4550/4570-19
MAX4550/MAX4570
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
V± = ±5V
CS
1V/div
0
0
0
COM
0.5V/div
COM
0.5V/div
COM
0.5V/div
0
0
0
25ns/div
8
5ms/div
5ms/div
_______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
PIN
NAME
FUNCTION
MAX4550
MAX4570
1
1
SB
2
2
NO3A
Input 3 to Crosspoint A
3
3
NO3B
Input 3 to Crosspoint B
4
4
BIASH
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).
5
5
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
6
NO4A
Input 4 to Crosspoint A
7
7
NO4B
Input 4 to Crosspoint B
8, 24
8, 24
V+
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.
Positive Supply Voltage. Supply range is +2.7V to +5.25V. Connect pin 8 to pin 24 externally.
9
9
COM2A
10
10
Q0
Output 2 of Crosspoint A
11
11
COM2B
12
12
Q1
Auxiliary Output 1
13
—
A0
LSB+1 of 2-Wire Serial-Interface Address Field
—
13
CS
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.
14
—
SCL
2-Wire Serial-Interface Clock Input
Auxiliary Output 0
Output 2 of Crosspoint B
—
14
SCLK
3-Wire Serial-Interface Clock Input
15
—
SDA
2-Wire Serial-Interface Data Input. Data is clocked in on SCL’s rising edge.
—
15
DIN
3-Wire Serial-Interface Data Input. Data is clocked in on SCLK’s rising edge.
16
—
A1
LSB+2 of 2-Wire Serial-Interface Address Field
—
16
DOUT
17
17
Q2
18
18
COM1B
19
19
Q3
20
20
COM1A
21
21
GND
Ground
22
22
NO1A
Input 1 to Crosspoint A
23
23
NO1B
Input 1 to Crosspoint B
25
25
V-
26
26
NO2A
Input 2 to Crosspoint A
27
27
NO2B
Input 2 to Crosspoint B
28
28
SA
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.
Auxiliary Output 2
Output 1 of Crosspoint A
Auxiliary Output 3
Output 1 of Crosspoint A
Negative Supply Voltage. Supply range is from -5.25V to 0.
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.
_______________________________________________________________________________________
9
MAX4550/MAX4570
Pin Description
MAX4550/MAX4570
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
Detailed Description
The MAX4550/MAX4570 are serial-interface, programmable, dual 4x2 audio/video crosspoint switches. Each
device contains two independent 4x2 crosspoint
switches, controlled through the on-chip serial interface. The MAX4550 uses a 2-wire I2C-compatible serial
communications protocol, while the MAX4570 uses a
3-wire SPI/QSPI/MICROWIRE-compatible serial communications 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 frequencies up to 4MHz. They feature 80Ω on-resistance, 10Ω
on-resistance matching between channels, 5Ω onresistance flatness, and as low as 0.004% total harmonic distortion.
The MAX4550/MAX4570 offer better than -110dB of
audio off-isolation, -95dB of audio crosstalk, -78dB of
video off-isolation, and -54dB of video crosstalk
(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 switching mode is selectable for each individual output using
the serial interface.
__________ Applications Information
The MAX4550/MAX4570 are divided into five functional
blocks: the control-logic block, two switch-matrix
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.
Command-Byte and Data-Byte
Programming
The devices are programmed through their serial interface with a command byte followed by a data byte.
Each bit of the command byte selects one of the functional blocks to be controlled by the subsequent data
byte. The data byte sets the state of the selected
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
state of the four auxiliary outputs (see Functional
Diagram).
10
A logic “1” in any bit position of the data byte makes
that function active, while a logic “0” makes it inactive.
Tables 1–4 describe the command byte and the corresponding data byte. For example, if bit C4 of the command 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 simultaneously set both switch matrices to the same configuration. Any block that is not selected in the command
byte remains unchanged.
Table 1. Command-Byte Format
BIT
REGISTER
C7
Don’t care
C6
Don’t care
C5
BIAS/MODE
C4
AUX
C3
COM2B
C2
COM1B
C1
COM2A
C0
COM1A
Table 2. COM Data-Byte Format
(C0, C1, C2, C3 = “1”)
BIT
DESCRIPTION
D7
Don’t care
D6
Don’t care
D5
Don’t care
D4
Controls the switch connected to S_ ;
1 = close switch, 0 = open switch.
D3
Controls the switch connected to NO4_ ;
1 = close switch, 0 = open switch.
D2
Controls the switch connected to NO3_ ;
1 = close switch, 0 = open switch.
D1
Controls the switch connected to NO2_ ;
1 = close switch, 0 = open switch.
D0
Controls the switch connected to NO1_ ;
1 = close switch, 0 = open switch.
______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
BIT
DESCRIPTION
D7
Don’t care
D6
Don’t care
D5
Don’t care
D4
Don’t care
D3
Controls output Q3; 1 = set output high,
0 = set output low.
D2
Controls output Q2; 1 = set output high,
0 = set output low.
D1
Controls output Q1; 1 = set output high,
0 = set output low.
D0
Controls output Q0; 1 = set output high,
0 = set output low.
Table 4. Clickless Mode/BIAS_ Data-Byte
Format (C5 = “1”)
BIT
DESCRIPTION
D7
Controls COM2B clickless mode; 1 = enables
clickless mode, 0 = disables clickless mode.
D6
Controls COM1B clickless mode; 1 = enables
clickless mode, 0 = disables clickless mode.
D5
Controls COM2A clickless mode; 1 = enables
clickless mode, 0 = disables clickless mode.
D4
Controls COM1A clickless mode; 1 = enables
clickless mode, 0 = disables clickless mode.
D3
Controls COM2B bias resistors; 1 = connect bias
resistors, 0 = disconnect bias resistors.
D2
Controls COM1B bias resistors; 1 = connect bias
resistors, 0 = disconnect bias resistors.
D1
Controls COM2A bias resistors; 1 = connect bias
resistors, 0 = disconnect bias resistors.
D0
Controls COM1A bias resistors; 1 = connect bias
resistors, 0 = disconnect bias resistors.
2-Wire Serial Interface
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
address a given chip, the A0 and A1 bits 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.
The 2-wire serial interface requires only two I/O lines of
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 information. Each transmission consists of a start condition, the
MAX4550’s programmable slave-address byte, a command-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 period after the address byte is transmitted. The slave
device also issues a similar acknowledgment after the
command byte and again after the data byte.
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.
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
device recognizes its address (10011A 1 A 0 0), it
acknowledges that it is ready for further communication
by pulling the SDA line low while SCL is high.
3-Wire Serial Interface
The MAX4570 3-wire serial interface is SPI/
QSPI/MICROWIRE-compatible. An active-low chipselect (CS) input enables the device to receive data
from the serial input (DIN). Data is clocked in on the rising edge of the serial-clock (SCLK) signal. A total of 16
bits are needed in each write cycle. Segmented write
cycles are allowed (two 8-bit-wide transfers) 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.
______________________________________________________________________________________
11
MAX4550/MAX4570
Table 3. AUX_ Data-Byte Format (C4 = “1”)
MAX4550/MAX4570
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
Table 5. 2-Wire Serial-Interface Data Format
ADDRESS BYTE
S
R
T
COMMAND BYTE
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
1
0
0
1
1
A
1
A
0
0
A
C
K
DATA BYTE
C
7
C
6
C
5
C
4
C
3
C
2
C
1
C
0
X
X
B
I
A
S
A
U
X
C
O
M
2
B
C
O
M
1
B
C
O
M
2
A
C
O
M
1
A
A
C
K
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
A
C
K
X = Don’t care
SRT = Start condition
ACK = Acknowledge condition
STOP = Stop condition
SCL
SDA
A0
A7
SRT
D7
D7
D0
ACK
D0
ACK
ACK
STOP
Figure 1. 2-Wire Serial-Interface Timing Diagram
A
tLOW
B
tHIGH
C
E
D
F
G
H
I
J
SCL
SDA
tSU:STA tHD:STA
tSU:DAT
tHD:DAT
A = START CONDITION
B = MSB OF ADDRESS BYTE
C = LSB OF ADDRESS BYTE
D = ACKNOWLEDGE CLOCKED INTO MASTER
E = MSB OF COMMAND BYTE
tSU:STO tBUF
F = LSB OF COMMAND BYTE
G = ACKNOWLEDGE CLOCKED INTO MASTER
H = MSB OF DATA BYTE
I = LSB OF DATA BYTE
J = ACKNOWLEDGE CLOCKED INTO MASTER
Figure 2. 2-Wire Serial-Interface Timing Details
12
______________________________________________________________________________________
S
T
O
P
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
CS
SCLK
1
DIN
16
C0
C7
COMMAND BYTE
D7
D0
DATA BYTE
Figure 3. 3-Wire Serial-Interface Communication
•••
CS
tCSH
tCSS
tCL
SCLK
tCH
tCSH
•••
tDS
tDH
•••
DIN
tDV
tDO
tTR
•••
DOUT
Figure 4. 3-Wire Serial-Interface Timing Details
______________________________________________________________________________________
13
MAX4550/MAX4570
Daisy Chaining
To program several MAX4570s, “daisy chain” 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 simultaneously.
Figures 3, 4, and Table 6 show the details of the
3-wire protocol, as it applies to the MAX4570. DOUT is
the shift register’s output. Data at DOUT is simply the
input data delayed by 16 clock cycles, with data
appearing synchronous with SCLK’s falling edge.
Transitions at DIN and SCLK have no effect when CS is
high, and DOUT holds the last bit in the shift register.
MAX4550/MAX4570
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
Table 6. 3-Wire Serial-Interface Data Format
COMMAND BYTE
DATA BYTE
MSB
LSB
C7
C6
C5
C4
C3
C2
C1
C0
D7
D6
D5
D4
D3
D2
D1
D0
X
X
BIAS
AUX
COM2B
COM1B
COM2A
COM1A
D7
D6
D5
D4
D3
D2
D1
D0
X = Don’t care
Addressable Serial Interface
To program several MAX4570s individually using a single 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.
Using the Auxiliary Outputs
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).
Improving Off-Isolation
Clickless Switching
To improve off-isolation, connect the SA or SB input to
ground either directly (DC ground) or through capacitors (AC ground). Closing SA or SB effectively grounds
the unused outputs.
Audible switching transients (“clicks”) are eliminated in
this mode of operation. When an output is configured
as “clickless,” the gate signal of the switches connected to that output are controlled with slow-moving voltages. 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.
Using the Internal Bias Resistors
Use the internal bias-resistor networks to give 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 command byte. Connect the BIASH and
BIASL inputs to DC levels (for example, V+ and GND),
and activate the switch connecting the appropriate output. This applies a voltage midway between VBIASH
and VBIASL to the output (refer to Tables 1, 4, and the
Functional Diagram).
14
Power-Up State
The MAX4550/MAX4570 feature a preset power-up
state. Upon power-up, COM1A and COM2A are connected to SA, COM1B and COM2B are connected to
SB, all outputs are set to clickless mode, all bias-resistor networks are disconnected from the outputs, and all
auxiliary outputs are low. All other switches are open.
______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
NO1A
NO2A
NO3A
NO4A
SA
22
26
MAX4550
MAX4570
2
6
28
20
9
SWITCH MATRIX ‘A’
NO1B
NO2B
NO3B
NO4B
SB
V+
VGND
COM1A
COM2A
23
27
3
7
1
18
11
SWITCH MATRIX ‘B’
8, 24
25
4
COM1B
COM2B
BIASH
21
10
10
4
SDA/(DIN)
SCL/(SCLK)
A0/(CS)
A1/(DOUT)
15
14
13
5
CONTROL
LOGIC
BIASL
BIAS RESISTOR NETWORK
16
4
10
12
17
19
SWITCH STATES SHOWN IN POWER-UP STATE.
AUXILIARY OUTPUTS ARE LOW IN POWER-UP STATE.
Q0
Q1
Q2
Q3
AUXILIARY OUTPUTS
( ) ARE FOR MAX4570
______________________________________________________________________________________
15
MAX4550/MAX4570
Functional Diagram
Serially Controlled, Dual 4x2, Clickless
Audio/Video Analog Crosspoint Switches
SSOP.EPS
MAX4550/MAX4570
Package Information
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 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.