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19-1404; Rev 1; 4/99
Serially Controlled, Clickless Audio/Video Switches
General Description
The MAX4571-MAX4574 serial-interface controlled switches are ideal for multimedia applications. Each device features 35 max on-resistance, -90dB audio off-isolation at 20kHz, -60dB video off-isolation at 1.0MHz, and "clickless" mode operation for audio applications. The MAX4571/MAX4573 contain eleven SPST switches, while the MAX4572/MAX4574 contain two SPST switches and six SPDT switches. The MAX4571/MAX4572 feature a 2-wire, I 2CTM-compatible serial interface. The MAX4573/MAX4574 feature a 3-wire, SPITM/QSPITM/ MICROWIRETM-compatible serial interface. All four parts are available in 28-pin QSOP, SSOP, and wide SO packages and operate over the commercial and extended temperature ranges.
Features
o Selectable Soft Switching Mode for "Clickless" Audio Operation o 35 max On-Resistance o -90dB Audio Off-Isolation at 20kHz -50dB Video Off-Isolation at 10MHz o -90dB Audio Crosstalk at 20kHz -52dB Video Crosstalk at 10MHz o Serial Interface 2-Wire, Fast-Mode, I2C-Compatible (MAX4571/72) 3-Wire, SPI/QSPI/MICROWIRE-Compatible (MAX4573/74) o Single-Supply Operation from +2.7V to +5.25V
MAX4571-MAX4574
Applications
Set-Top Boxes PC Multimedia Boards Audio Systems Video Conferencing Systems
PART MAX4571CEI MAX4571CAI MAX4571CWI MAX4571EEI MAX4571EAI MAX4571EWI MAX4572CEI MAX4572CAI MAX4572CWI MAX4572EEI MAX4572EAI MAX4572EWI MAX4573CEI MAX4573CAI MAX4573CWI MAX4573EEI MAX4573EAI MAX4573EWI MAX4574CEI MAX4574CAI MAX4574CWI MAX4574EEI MAX4574EAI MAX4574EWI
Ordering Information
TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 28 QSOP 28 SSOP 28 Wide SO 28 QSOP 28 SSOP 28 Wide SO 28 QSOP 28 SSOP 28 Wide SO 28 QSOP 28 SSOP 28 Wide SO 28 QSOP 28 SSOP 28 Wide SO 28 QSOP 28 SSOP 28 Wide SO 28 QSOP 28 SSOP 28 Wide SO 28 QSOP 28 SSOP 28 Wide SO
Pin Configurations
TOP VIEW
MAX4571/MAX4573
NO1 1 COM1 2 NO2 3 COM2 4 NO3 5 COM3 6 NO4 7 COM4 8 NO5 9 COM5 10 NO6 11 COM6 12 NO7 13 COM7 14 ( ) ARE FOR MAX4573 28 V+ 27 SDA (DOUT) 26 SCL (DIN) 25 A1 (SCLK) 24 A0 (CS) 23 GND 22 NO8 21 COM8 20 NO9 19 COM9 18 NO10 17 COM10 16 NO11 15 COM11
QSOP/SSOP/SO
I2C is a trademark of Philips Corp. SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
1
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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, Clickless Audio/Video Switches MAX4571-MAX4574
ABSOLUTE MAXIMUM RATINGS
V+ to GND ................................................................-0.3V to +6V NO_ _, COM_, DOUT to GND (Note 1) ........-0.3V to (V+ + 0.3V) SCL, SDA, CS, SCLK, DIN, A0, A1 to GND..............-0.3V to +6V Continuous Current into Any Terminal..............................10mA Peak Current (pulsed at 1ms, 10% duty cycle)................50mA Continuous Power Dissipation (TA = +70C) QSOP (derate 10.8mW/C above +70C) ...................860mW SSOP (derate 9.5mW/C above +70C) .....................762mW Wide SO (derate 12.5mW/C above +70C).............1000mW Operating Temperature Ranges MAX457_C_ _ ....................................................0C to +70C MAX457_E_ _..................................................-40C to +85C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C
Note 1: Signals on NO_ _ 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.
ELECTRICAL CHARACTERISTICS--Single +5V Supply
(V+ = +5V 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER ANALOG SWITCHES Analog Signal Range (Note 3) VNO_ _, VCOM_ RON ICOM_ = 4mA, VNO_ _ = 3V, V+ = 4.75V ICOM_ = 4mA, VNO_ _ = 3V, V+ = 4.75V ICOM_ = 4mA; V+ = 4.75V; VNO_ _ = 1V, 2V, 3V VNO_ _ = 4.5V, 1V; VCOM_ = 1V, 4.5V; V+ = 5.25V VNO_ _ = 4.5V, 1V; VCOM_ = 1V, 4.5V; V+ = 5.25V VCOM_ = 4.5V, 1V; VNO_ _ = 4.5V, 1V, or floating; V+ = 5.25V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -0.2 -10 -0.2 -10 -0.2 -10 0.01 0.01 0.01 2 0.8 0 25 V+ 35 45 3 3 6 6 0.2 nA 10 0.2 nA 10 0.2 nA 10 V SYMBOL CONDITIONS MIN TYP MAX UNITS
On-Resistance
On-Resistance Match Between Channels (Note 4) On-Resistance Flatness (Note 5) NO_ _ 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
RON
RFLAT
INO_ _ (OFF)
ICOM_ (OFF)
ICOM_ (ON)
THD+N VISO(A) VCT(A)
fIN = 1kHz, RL = 600, VNO_ _ = 1VRMS, VNO_ _ = 2.5V VNO_ _ = 1VRMS, fIN = 20kHz, RL = 600, Figure 1 VNO_ _ = 1VRMS, fIN = 20kHz, RS = 600, Figure 1
0.07 -90 -90
% dB dB
2
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Serially Controlled, Clickless Audio/Video Switches
ELECTRICAL CHARACTERISTICS--Single +5V Supply (continued)
(V+ = 5V 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER VIDEO PERFORMANCE Off-Isolation (Note 7) Channel-to-Channel Crosstalk -3dB Bandwidth Off-Capacitance VISO(V) VCT(V) BW COFF(NO) VNO_ _ = 1VRMS, fIN = 1.0MHz, RL = 50, Figure 1 VNO_ _ = 1VRMS, fIN = 1.0MHz, RS = 50, Figure 1 RSOURCE = 50, RL = 50 fIN = 1MHz VNO_ _ = 1.5V, RL = 5k, CL = 35pF VNO_ _ = 1.5V, RL = 300, CL = 35pF TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 10 125 75 -50 -52 >150 9 dB dB MHz pF SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4571-MAX4574
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Notes 8 and 12, Figure 2) 200 500 ns 700 300 ns 400 ns Turn-On Time tONSD
Turn-Off Time
tOFFSD
Break-Before-Make Time
tBBM
MAX4572/MAX4574, VNO_ _ = 1.5V, TA = TMIN to TMAX VNO_ _ = 1.5V, RL = 5k, CL = 35pF, TA = +25C VNO_ _ or = 1.5V, RL = 300, CL = 35pF, TA = +25C TA = TMIN to TMAX All logic inputs = 0 or V+, TA = TMIN to TMAX
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 2) Turn-On Time Turn-Off Time POWER SUPPLY Supply Voltage Range Supply Current (Note 9) V+ I+ +2.7 6 +5.25 10 V A tONSE tOFFSE 8 3 ms ms
ELECTRICAL CHARACTERISTICS--Single +3V Supply
(V+ = 3V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER ANALOG SWITCHES Analog Signal Range (Note 3) VNO_ _, VCOM_ RON ICOM_ = 4mA, VNO_ _ =2V, V+ = 2.7V ICOM_ = 4mA, VNO_ _ = 2V, V+ = 2.7V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 1 0 43 V+ 90 110 5 5 V SYMBOL CONDITIONS MIN TYP MAX UNITS
On-Resistance
On-Resistance Match Between Channels (Note 4)
RON
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3
Serially Controlled, Clickless Audio/Video Switches MAX4571-MAX4574
ELECTRICAL CHARACTERISTICS--Single +3V Supply (continued)
(V+ = +3V 10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER On-Resistance Flatness (Note 5) SYMBOL RFLAT CONDITIONS ICOM_ = 4mA; V+ = 2.7V; VNO_ _ = 1V, 5V, 2V VNO_ _ = 3V, 0.5V; VCOM_ = 0.5V, 3V; V+ = 3.6V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -0.2 -10 -0.2 -10 -0.2 -10 0.01 0.01 0.01 MIN TYP 4 MAX 10 10 0.2 nA 10 0.2 nA 10 0.2 nA 10 UNITS
NO_ _Off-Leakage Current (Notes 6 and 10)
INO_ _ (OFF)
COM_ Off-Leakage Current (Notes 6 and 10)
VNO_ _ = 3V, 0.5V; ICOM_ (OFF) VCOM_ = 0.5V, 3V; V+ = 3.6V VCOM_ = 3V, 0.5V; VNO_ _ = 3V, 0.5V, or floating; V+ = 3.6V
COM _ On-Leakage Current (Notes 6 and 10) 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 -3dB Bandwidth Off Capacitance
ICOM_ (ON)
THD+N VISO(A) VCT(A)
fIN = 1kHz, RL = 600, VNO_ = 0.5VRMS, VNO_ _ = 1.5V VNO_ _ = 0.5VRMS, fIN = 20kHz, RL = 600, Figure 1 VNO_ _ = 0.5VRMS, fIN = 20kHz, RS = 600, Figure 1
0.07 -90 -90
% dB dB
VISO(V) VCT(V) BW COFF(NO)
VNO_ _ = 0.5VRMS, fIN = 10MHz, RL = 50, Figure 1 VNO_ _ = 0.5VRMS, fIN = 10MHz, RS = 50, Figure 1 RSOURCE = 50, RL = 50, CL = 35pF fIN = 1MHz VNO_ _ = 1.5V, RL = 5k, CL = 35pF TA = +25C TA = TMIN to TMAX
-50 -52 >150 9 300 100 10 200 900 1000 300 400
dB dB MHz pF
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Notes 8 and 12, Figure 2) Turn-On Time Turn-Off Time Break-Before-Make Time tONSD tOFFSD tBBM ns ns ns
TA = +25C VNO_ _ = 1.5V, RL = 300, CL = 35pF TA = TMIN to TMAX VNO_ _ = 1.5V, TA = TMIN to TMAX VNO_ _ = 1.5V, RL = 5k, CL = 35pF, TA = +25C VNO_ _ = 1.5V, RL = 300, CL = 35pF, TA = +25C
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Notes 8 and 12, Figure 2) Turn-On Time Turn-Off Time tONSE tOFFSE 8 3 ms ms
4
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Serially Controlled, Clickless Audio/Video Switches
I/O INTERFACE CHARACTERISTICS
(V+ = +2.7V to +5.25V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL V+ = 5V V+ = 3V V+ = 5V V+ = 3V Digital inputs = 0 or V+ 3 2 0.2 -1 0.01 5 ISINK = 6mA ISOURCE = 0.5mA V+ - 0.5 DC 1.3 0.6 0.6 0 100 1.3 0.6 (Note 11) (Note 11) 20 + 0.1Cb 20 + 0.1Cb DC 100 0 CLOAD = 50pF 20 100 0 200 200 200 2 2 200 300 300 0.9 400 0.4 1 CONDITIONS MIN TYP MAX 0.8 0.6 UNITS DIGITAL INPUTS (SCLK, DIN, CS, SCL, SDA, A0, A1) Input Low Voltage Input High Voltage Input Hysteresis Input Leakage Current Input Capacitance DIGITAL OUTPUTS (DOUT, SDA) Output Low Voltage DOUT Output High Voltage VOL VOH V V VIL VIH VHYST ILEAK CIN V V V A pF
MAX4571-MAX4574
2-WIRE INTERFACE TIMING (Figure 3) SCL Clock Frequency Bus Free Time between Stop and Start Condition START Condition Hold Time STOP Condition Setup Time Data Hold Time Data Setup Time Clock Low Period Clock High Period SCL/SDA Rise Time SCL/SDA Fall Time 3-WIRE TIMING (Figure 5) 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 CS High Pulse Width SCLK Pulse Width Low SCLK Pulse Width High Rise Time (SCLK, DIN, CS) Fall Time (SCLK, DIN, CS) fOP tDS tDH tDO tCSS tCSH tCSW tCL tCH tR tF 2.1 MHz ns ns ns ns ns ns ns ns s s fSCL tBUF tHD:STA tSU:STO tHD:DAT tSU:DAT tLOW tHIGH tR tF kHz s s s s ns s s ns ns
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5
Serially Controlled, Clickless Audio/Video Switches MAX4571-MAX4574
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). 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 = +25C. Note 7: Off-isolation = 20 log [VCOM_ / VNO_ _ ], VCOM_ = output, VNO_ _ = input to off switch. Note 8: All timing is measured from the rising clock edge of the ACK bit for 2-wire, and from the rising edge of CS for 3-wire. Turnoff time is defined at the output of the switch for a 0.5V change, tested with a 300 load to ground. Turn-on time is measured with a 5k load resistor to GND. All timing is shown with respect to 20% V+ and 70% V+, unless otherwise noted. Note 9: Supply current can be as high as 2mA per switch during switch transitions in the clickless mode, corresponding to a 28mA total supply transient current requirement. Note 10: Leakage testing for single-supply operation is guaranteed by testing with a single +5.25V supply. Note 11: Cb = capacitance of one bus line in pF. Tested with Cb = 400pF. Note 12: Typical values are for MAX4573/MAX4574 devices. Note 2: Note 3: Note 4: Note 5:
Typical Operating Characteristics
(V+ = +5V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM
MAX4571-4 toc01
ON-RESISTANCE vs. VCOM AND TEMPERATURE
MAX4571-4 toc02
LEAKAGE CURRENT vs. TEMPERATURE
MAX4571-4 toc03
50 45 ON-RESISTANCE () 40 35 V+ = 3.3V 30 25 V+ = 5.0V 20 0 1 2 3 4 5 VCOM (V) V+ = 2.7V
32 30 ON-RESISTANCE () 28 26 24 22 TA = +25C
100
TA = +85C TA = +70C
10 CURRENT (nA)
1 COM_ OFF 0.1 NO_ _ OFF 0.01
20 18 0 1
TA = -40C 0.001 2 3 4 5 -40 -20 0 20 40
NO_ _ ON 60 80
VCOM (V)
TEMPERATURE (C)
SUPPLY CURRENT vs. TEMPERATURE
MAX4571-4 toc04
CHARGE INJECTION vs. VCOM
MAX4571-4 toc05
ON/OFF TIME vs. TEMPERATURE (HARD MODE)
MAX4571-4 toc06
5.1 5.0 CURRENT (A) 4.9
3 2 1
600 500 400 TIME (ns) 300 200 tOFF, V+ = 3V 100 tOFF, V+ = 5V 0 tON, V+ = 3V tON, V+ = 5V
4.8 4.7 4.6 4.5 -40 -20 0 20 40 60 80 TEMPERATURE (C)
Q (pC)
0 -1 -2 -3 0 1 2 3 4 5 VCOM (V)
-40
-20
0
20
40
60
80
TEMPERATURE (C)
6
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Serially Controlled, Clickless Audio/Video Switches
Typical Operating Characteristics (continued)
(V+ = 5V,TA = +25C, unless otherwise noted.)
MAX4571-MAX4574
TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY
MAX4571-4 toc07
AUDIO FREQUENCY RESPONSE
MAX4571-4 toc08
VIDEO FREQUENCY RESPONSE
INSERTION-LOSS -20 OFF-ISOLATION CROSSTALK
MAX4571-4 toc09
1
600 IN AND OUT SIGNAL = 1VRMS
0 -20 -40 600 IN AND OUT
0
THD + N (%)
0.1
LOSS (dB)
-60 -80 CROSSTALK -100
LOSS (dB) OFF-ISOLATION
-40
-60
-80 50 IN AND OUT 0.1 1 10 100 FREQUENCY (MHz)
0.01 10 100 1000 FREQUENCY (Hz) 10,000 100,000
-120 10 100 1000 FREQUENCY (Hz) 10,000 100,000
-100
ON/OFF TIMES (SOFT MODE)
MAX4571-4 toc10
ON/OFF TIMES (HARD MODE)
MAX4571-4 toc13
CS 5V/div
CS 5V/div tON 1V/div
tON 1V/div 1V/div tOFF
1V/div
tOFF
TIME (2ms/div)
TIME (50ns/div)
SOFT MODE RISE TIME
MAX4571-4 toc11
SOFT MODE FALL TIME
MAX4571-4 toc12
AMPLITUDE (500mV/div)
AMPLITUDE (500mV/div)
TIME (500s/div)
TIME (500s/div)
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7
Serially Controlled, Clickless Audio/Video Switches MAX4571-MAX4574
Pin Descriptions
PIN MAX4571 1, 3, 5, 7, 9, 11, 13, 22, 20, 18, 16 - - - - 2, 4, 6, 8, 10, 12, 14, 21, 19, 17, 15 23 24 25 26 27 28 MAX4572 - 1, 4, 7, 10 3, 6, 9, 12 13, 16 22, 19, 20, 17 2, 5, 8, 11, 14, 21, 18, 15 23 24 25 26 27 28 MAX4571 NO1-NO11 - - - - NAME MAX4572 - NO1A-NO4A NO1B-NO4B NO5, NO8 NO6A, NO7A, NO6B, NO7B COM1-COM8 GND A0 A1 SCL SDA V+ FUNCTION
Normally Open Terminals Normally Open Terminals Normally Open Terminals Normally Open Terminals Normally Open Terminals
COM1-COM11 GND A0 A1 SCL SDA V+
Common Terminals Ground LSB + 1 of 2-Wire Serial Interface Address Field LSB + 2 of 2-Wire Serial Interface Address Field Clock Input of 2-Wire Serial Interface Data Input of 2-Wire Serial Interface Positive Supply Voltage
PIN MAX4573 1, 3, 5, 7, 9, 11, 13, 22, 20, 18, 16 - - - - 2, 4, 6, 8, 10, 12, 14, 21, 19, 17, 15 23 24 25 26 27 28 MAX4574 - 1, 4, 7, 10 3, 6, 9, 12 13, 16 22, 19, 20, 17 2, 5, 8, 11, 14, 21, 18, 15 23 24 25 26 27 28 MAX4573
NAME MAX4574 - NO1A-NO4A NO1B-NO4B NO5, NO8 NO6A, NO7A, NO6B, NO7B COM1-COM8 GND CS SCLK DIN DOUT V+
FUNCTION
NO1-NO11 - - - -
Normally Open Terminals Normally Open Terminals Normally Open Terminals Normally Open Terminals Normally Open Terminals
COM1-COM11 GND CS SCLK DIN DOUT V+
Common Terminals Ground Chip Select of 3-Wire Serial Interface Clock Input of 3-Wire Serial Interface Clock Input of 3-Wire Serial Interface Data Output of 3-Wire Serial Interface Positive Supply Voltage
8
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Serially Controlled, Clickless Audio/Video Switches MAX4571-MAX4574
10nF
V+
MAX4571 MAX4572 MAX4573 MAX4574
2/3 ANALYZER RL SIGNAL GENERATOR 0dBm
10nF
V+
MAX4571 MAX4572 MAX4573 MAX4574
NO1 2/3 50
ANALYZER RL SIGNAL GENERATOR 0dBm
COM_V+
V+ COM1
DECODER/ CONTROLLER NO_ _ GND
DECODER/ CONTROLLER NO2 GND COM2
N.C.
a) Off-Isolation
b) Crosstalk
Figure 1. Off-Isolation and Crosstalk
3V
MAX4571 MAX4572 MAX4573 MAX4574
SCL 0 VOUT V+ 2-Wire 0 VOUT VOUT RL 300 DECODER/ CONTROLLER SERIAL INTERFACE GND 3-Wire 0 CL 35pF 3V CS 0 VOUT 0
ACKNOWLEDGE BIT tr < 20ns 50% tf < 20ns
0.9 * VOUT tON
V+ NO NO_ _ COM_
0.1 * VOUT tOFF
2 OR 3 P
50%
0.9 * VOUT tON
CL INCLUDES FIXTURE AND STRAY CAPACITANCE VOUT = VCOM [RL / (RL + RON)]
VOUT 0 0.1 * VOUT tOFF
Figure 2. Switching Time
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Serially Controlled, Clickless Audio/Video Switches MAX4571-MAX4574
Detailed Description
The MAX4571-MAX4574 are serial-interface controlled switches with soft-mode "clickless" and hard-mode operating capability. The MAX4571/MAX4573 contain 11 SPST switches, while the MAX4572/MAX4574 contain two SPST switches and six SPDT switches. The SPDT switches are actually 2-to-1 multiplexers, in that each SPDT is really two independent SPST switches with a common node, as shown in the Pin Configurations. Each switch is controlled independently by either the SPI or I2C interface. Audio off-isolation is -90dB at 20kHz, crosstalk is at least -90dB at 20kHz, and video off-isolation is at least -50dB at 10MHz. Each switch of any device may be set to operate in either soft or hard mode. In soft mode, the switching transition is slowed to avoid the audible "clicking" that can occur when switches are used to route audio signals. In hard mode, the switches are not slowed down, making this mode useful when a faster response is required. If a new command is issued while any softmode switch is transitioning, the switch transition time is decreased so it reaches its final state before the new command is executed. Soft mode is the power-up default state for all switches. Switches in the same mode are guaranteed to be break-before-make relative to each other. Break-before-make does not apply between switches operating in different modes. These devices operate from a single supply of +2.7V to +5.25V. The MAX4571/MAX4572 feature a 2-wire, I2Ccompatible serial interface, and the MAX4573/ MAX4574 feature a 3-wire, SPI/QSPI/MICROWIRE-compatible serial interface. uration of the data bits and their related switches. The arrangement of the command bits and the data bits depends on the interface type (2-wire or 3-wire). After a SWITCHSET command is issued, a logic 1 in any databit location closes the associated switch, while a logic 0 opens it. After a MODESET command, a logic 1 in any data-bit location sets the associated switch into hard mode, while a logic 0 sets it into soft mode.
2-Wire Serial Interface
The MAX4571/MAX4572 use a 2-wire, I2C-compatible serial interface requiring only two I/O lines of a standard microprocessor port for communication. These devices use the SendByteTM and WriteWordTM protocols. The SendByte protocol is used only for the RESET command. The WriteWord protocol is used for the MODESET and SWITCHSET commands. The first byte of any 2-wire serial-interface transaction is always the address byte. To address a given chip, the A0 and A1 bits in the address byte (Table 3) must duplicate the values present at the A0 and A1 pins of that chip, and the rest of the address bits must be configured as shown in Table 3. Connect the A0 and A1 pins to V+ or to GND, or drive them with CMOS logic levels. The second byte is the command byte. The possible commands are RESET, MODESET, and SWITCHSET. RESET sets all switches to the initial power-up state (open and in soft switching mode). The RESET command is executed on the rising clock edge of the acknowledge bit after the command byte. The MODESET and SWITCHSET commands are each followed by two data bytes. The first data byte is buffered so all the data latches switch together. MODESET and SWITCHSET are executed on the rising clock edge of the acknowledge bit after the second data byte. Table 3 details the 2-wire interface data structure. Figures 3 and 4 and the I/O Interface Characteristics detail the timing of the 2-wire serial-interface protocol. All bytes of the transmission, whether address, command, or data, are sent MSB first. The MAX4571/MAX4572 are receive-only devices and must be controlled by a bus master device. A bus master signals the beginning of a transmission with a start condition by transitioning SDA from high to low while SCL is high. The slave devices monitor the serial bus continuously, waiting for a start condition followed by an address byte. When a device recognizes its address byte, it acknowledges by pulling the SDA line low for one clock period; it is then ready to accept command and data bytes. The device then issues a similar acknowledgment after the command byte, and again after each data byte. When the master has finished
Applications Information
Switch Control
The MAX4571-MAX4574 have a common command and control-bit structure, the differences being only in the interface type (2-wire or 3-wire) and in the switch configurations. The SWITCHSET command controls the open/closed states of the various switches. MODESET controls soft/hard-mode states of the switches. There are also NO_OP and RESET commands. The NO_OP command is useful for daisy-chaining multiple 3-wire parts. The RESET command places a device in a state identical to its power-up state, with all switches open and in soft switching mode. Table 1 shows the configuration of the command bits and their related commands. Table 2 shows the configSendByte and WriteWord are trademarks of Philips Corp.
10
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Serially Controlled, Clickless Audio/Video Switches
Table 1. Command Bit Mapping
MSB 0 0 1 1 MSB - 1 0 1 0 1 COMMAND RESET MODESET NO_OP SWITCHSET DESCRIPTION Sets all switches open and in soft switching mode. Sets specified switches to soft or hard mode. No Operation. Sets specified switches open or closed.
MAX4571-MAX4574
Table 2. Data-Bit Switch Control
DATA BIT D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 (LSB) MAX4571/MAX4573 SWITCH X X X SW11 SW10 SW9 SW8 SW7 SW6 SW5 SW4 SW3 SW2 SW1 SWITCH TERMINALS X X X 15, 16 17, 18 19, 20 21, 22 13, 14 11, 12 9, 10 7, 8 5, 6 3, 4 1, 2 SWITCH SW8 SW5 SW7B SW7A SW6B SW6A SW4B SW4A SW3B SW3A SW2B SW2A SW1B SW1A MAX4572/MAX4574 SWITCH TERMINALS 15, 16 13, 14 17, 18 18, 19 20, 21 21, 22 11, 12 10, 11 8, 9 7, 8 5, 6 4, 5 2, 3 1, 2
X = Don't care
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.
3-Wire Serial Interface
The MAX4573/MAX4574 use a 3-wire SPI/QSPI/ MICROWIRE-compatible serial interface. An active-low chip-select pin, CS, enables the device to receive data from the serial input pin, DIN. Command and data information are clocked in on the rising edge of the serialclock signal (SCLK) MSB first. A total of 16 bits are needed in each write cycle. The write cycle allows two 8-bit-wide transfers if CS remains low for the entire 16 bits. The command code is contained in the two MSBs of the 16-bit word. The remaining bits control the switches as shown in Table 4. While shifting in the serial data, the device remains in its original configuration. A rising edge on CS latches the data into the MAX4573/MAX4574 internal registers, initiating the device's change of state. Table 4 shows the details of the 3-wire interface data structure.
Figures 5 and 6 and the I/O Interface Characteristics show the timing details of the 3-wire interface. If the two command bits initiate a SWITCHSET command, a logic 1 in a switch control location closes the associated switch, while a logic 0 opens it. If the command bits initiate a MODESET command, a logic 1 in a switch control location sets the associated switch into hard mode, while a logic 0 sets it into soft, "clickless" mode. For command-bit configurations, see Table 1.
Using Multiple Devices
There are two ways to connect multiple devices to the same 3-wire serial interface. The first involves using the DOUT pin. DOUT presents a copy of the last bit of the internal shift register, useful for daisy-chaining multiple devices. Data at DOUT are simply the input data delayed by 16 clock cycles, appearing synchronous with SCLK's falling edge. After CS goes high, DOUT holds the last bit in the shift register until new data are shifted into DIN. For a simple interface using several MAX4573/MAX4574 devices, daisy-chain the shift reg11
______________________________________________________________________________________
Serially Controlled, Clickless Audio/Video Switches MAX4571-MAX4574
Table 3. 2-Wire Serial-Interface Data Format
RESET Command
Address Byte MSB S R T 0 1 1 0 1 A 1 A 0 LSB 0 A C K Command Byte (RESET) MSB 0 0 X X X X X LSB X A C K S T P
SWITCHSET Command
Address Byte MSB S R T 0 1 1 0 1 A 1 A 0 LSB 0 A C K Command Byte (SWITCHSET) MSB 1 1 X X X X X LSB X A C K
MAX4571
First Data Byte MSB X X X X X SW 11 SW 10 LSB SW 9 A C K MSB SW 8 SW 7 SW 6 SW 5 SW 4 SW 3 SW 2 Second Data Byte LSB SW 1 A C K S T P
MAX4572
First Data Byte MSB X X SW 8 SW 5 SW 7B SW 7A SW 6B LSB SW 6A A C K MSB SW 4B SW 4A SW 3B SW 3A SW 2B SW 2A SW 1B Second Data Byte LSB SW 1A A C K S T P
MODESET Command
Address Byte MSB S R T 0 1 1 0 1 A 1 A 0 0 A C K Command Byte (MODESET) MSB 0 1 X X X X X LSB X A C K
MAX4571
First Data Byte MSB X X X X X SW 11 SW 10 LSB SW 9 A C K MSB SW 8 SW 7 SW 6 SW 5 SW 4 SW 3 SW 2 Second Data Byte LSB SW 1 A C K S T P
MAX4572
First Data Byte MSB X X SW 8 SW 5 SW 7B SW 7A SW 6B LSB SW 6A A C K MSB SW 4B SW 4A SW 3B SW 3A SW 2B SW 2A SW 1B Second Data Byte LSB SW 1A A C K S T P
X = Don't Care SRT = Start Condition ACK = Acknowledge Condition
STP = Stop Condition Logic "0" in any data bit location places the associated switch open or in soft (clickless) switching mode. Logic "1" in any data bit location places the associated switch closed or in hard switching mode. For command bit configuration see Table 1.
12
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Serially Controlled, Clickless Audio/Video Switches
Table 4. 3-Wire Serial-Interface Data Format
MAX4573 (11 SPST) MSB COMMAND D15 C1 D14 C0 D13 X D12 X D11 X D10 SW11 D9 SW10 D8 SW9 SWITCH CONTROL D7 SW8 D6 SW7 D5 SW6 D4 SW5 D3 SW4 D2 SW3 D1 SW2 D0 SW1 LSB
MAX4571-MAX4574
MAX4574 (6 SPDT + 2 SPST) MSB COMMAND D15 C1 D14 C0 D13 SW8 D12 SW5 D11 SW7B D10 D9 D8 SWITCH CONTROL D7 D6 D5 D4 D3 D2 D1 D0 SW7A SW6B SW6A SW4B SW4A SW3B SW3A SW2B SW2A SW1B SW1A LSB
SDA
70% 20% tSU, DAT tLOW
70% 20% tSU, STA
70% 20%
70% 20% tBUF tHD, STA tSU, STO
70% 20%
tHD, DAT 70% 20% tHIGH tR tF REPEATED START CONDITION 70% 20% 70% 70%
SCL tHD, STA
70% 20%
70%
START CONDITION
STOP CONDITION
START CONDITION
Figure 3. 2-Wire Serial-Interface Timing Diagram
ADDRESS BYTE SDA MSB SCL START CONDITION LSB ACK MSB
COMMAND BYTE
FIRST DATA BYTE
SECOND DATA BYTE
LSB
ACK
MSB
LSB
ACK
MSB
LSB ACK
STOP CONDITION
Figure 4. A Complete 2-Wire Serial-Interface Transmission
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Serially Controlled, Clickless Audio/Video Switches MAX4571-MAX4574
isters by connecting DOUT of the first device to DIN of the second, etc. Connect the CS pins of all devices together. Data are shifted through the MAX4573/ MAX4574s in series. When CS is brought high, all devices are updated simultaneously. If any of the devices in the chain are to be left unchanged, use a NO_OP command for that device, as shown in Table 1. An alternate way of connecting multiple devices is to decode the CS line. In this case the DOUT pin is not used and the DIN pins of all devices are connected together. Address decode logic individually controls the CS line of each device. When a device is to be selected its CS line is brought low, data are shifted in, and its CS is then brought high to execute the command.
CS
20% tCSS tCL 20% tDH tDS 20% tCH 20% 20% 70% 70%
20% tCSH
tCSW
70% tCSO 70%
SCLK
20%
DIN
D15
D14
D1 tDO
D0
DOUT
Figure 5. 3-Wire Serial-Interface Timing Diagram
CS COMMAND EXECUTED 1 DIN D15 D14 D13.... MSB DOUT Q15........ MSB FROM PREVIOUS WRITE .........00 LSB FROM PREVIOUS WRITE D2 D1 D0.... LSB 8 9 16
SCLK
Figure 6. A Complete 3-Wire Serial-Interface Transmission
14
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Serially Controlled, Clickless Audio/Video Switches
Pin Configurations (continued)
TOP VIEW
___________________Chip Information
TRANSISTOR COUNT: 5397
MAX4571-MAX4574
MAX4572/MAX4574
NO1A 1 COM1 2 NO1B 3 NO2A 4 COM2 5 NO2B 6 NO3A 7 COM3 8 NO3B 9 NO4A 10 COM4 11 NO4B 12 NO5 13 COM5 14 28 V+ 27 SDA (DOUT) 26 SCL (DIN) 25 A1 (SCLK) 24 A0 (CS) 23 GND 22 NO6A 21 COM6 20 NO6B 19 NO7A 18 COM7 17 NO7B 16 NO8 15 COM8
QSOP/SSOP/SO
( ) ARE FOR MAX4574
Package Information
QSOP.EPS
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15
Serially Controlled, Clickless Audio/Video Switches MAX4571-MAX4574
Package Information (continued)
SSOP.EPS
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 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOICW.EPS

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