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19-1461; Rev 0; 4/99
Serially Controlled, Clickless Audio/Video Switches
General Description
The MAX4562/MAX4563 serial-interface controlled switches are ideal for multimedia applications. Each device features 30 max on-resistance (RON), 5 RON match, and 5 RON flatness. Audio off-isolation and crosstalk at 20kHz is -85dB, and video off-isolation and crosstalk at 10MHz is -55dB. Both devices feature "clickless" mode operation for audio applications. The MAX4562/MAX4563 contain two normally open single-pole/double-throw (SPDT) switches and two normally open single-pole/single-throw (SPST) switches. The MAX4562 features a 2-wire I 2 CTM-compatible serial interface. The MAX4563 features a 3-wire SPITM/QSPITM/ MICROWIRETM-compatible serial interface. Both parts are available in 16-pin QSOP packages and operate over the commercial and extended temperature ranges.
Features
o Selectable Soft-Switching Mode for "Clickless" Audio Operation o 30 max On-Resistance o Audio Performance -85dB Off-Isolation at 20kHz -85dB Crosstalk at 20kHz -0.007% THD o Video Performance -55dB Off-Isolation at 10MHz -55dB Crosstalk at 10MHz o T-Switch Configurable for Improved Off-Isolation o Serial Interface 2-Wire I2C-Compatible (MAX4562) 3-Wire SPI/QSPI/MICROWIRE-Compatible (MAX4563) o Single-Supply Operation from +2.7V to +5.5V
MAX4562/MAX4563
Applications
Set-Top Boxes PC Multimedia Boards Audio Systems Video Conferencing Systems
Ordering Information
PART MAX4562CEE TEMP. RANGE 0C to +70C -40C to +85C 0C to +70C -40C to +85C PIN-PACKAGE 16 QSOP 16 QSOP 16 QSOP 16 QSOP
Pin Configuration
TOP VIEW
MAX4562EEE MAX4563CEE MAX4563EEE
V+ 1 NO1A 2 COM1 3 NO1B 4 GND 5 NO2A 6 COM2 7 NO2B 8
16 SCL (SCLK)
MAX4562 15 SDA (DIN) MAX4563
14 A0 (CS) 13 A1 (DOUT) 12 NO4 SIGNAL IN 11 COM4 10 NO3 9 COM3 NO2A
Typical Operating Circuit
COM2 COM3
NO2B
SIGNAL OUT
QSOP
( ) ARE FOR MAX4563
NO3
I2C is a trademark of Philips Corp. SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ 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.
Serially Controlled, Clickless Audio/Video Switches MAX4562/MAX4563
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..............................20mA Peak Current (NO_ _, COM_ pulsed at 1ms, 10% duty cycle max) .....................................................50mA Continuous Power Dissipation (TA = +70C) 16-Pin QSOP (derate 8.3mW/C above +70C)............667mW Operating Temperature Ranges MAX456_CEE....................................................0C to +70C MAX456_EEE .................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
Note 1: Signals on NO_ _ or COM_ exceeding V+ or ground 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 TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 2 3 0 20 V+ 30 40 5 7 5 7 -1 -10 -1 -10 -1 -10 0.07 0.006 -85 -85 0.002 0.001 0.001 1 nA TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 10 1 nA 10 1 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
ICOM_ = 4mA; TA = +25C VNO_ _ = 1V, 2V, 3V; TA = TMIN to TMAX V+ = 4.75V VNO_ _ = 4.5V, 1V; VCOM_ = 1V, 4.5V; V+ = 5.25V VCOM_ = 1V, 4.5V; VNO_ _ = 4.5V, 1V; V+ = 5.25V VCOM_ = 4.5V, 1V; VNO_ _ = 4.5V, 1V, or floating; V+ = 5.25V TA = +25C
INO_ _(OFF)
ICOM_(OFF)
ICOM_(ON)
THD+N VISO(A) VCT(A)
fIN = 1kHz, VNO_ _ = RL = 600 1VRMS, VNO_ _ = 2.5V RL =10k VNO_ _ = 1VRMS, fIN = 20kHz, RL = 600, Figure 1 VNO_ _ = 1VRMS, fIN = 20kHz, RS = 600, Figure 1
% 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 = 10MHz, RL = 50, Figure 1 VNO_ _ = 1VRMS, fIN = 10MHz, RS = 50, Figure 1 RSOURCE = 50, RL = 50 fIN = 1MHz VNO_ _ = 2.5V, RL = 5k, CL = 35pF VNO_ _ = 2.5V, RL = 300, CL = 35pF TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 10 50 12 3 2.7 6 5.5 10 100 -55 -55 300 10 dB dB MHz pF SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4562/MAX4563
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note 8, Figure 2) 200 400 ns 500 160 ns 200 ns ms ms V A Turn-On Time tONSD
Turn-Off Time Break-Before-Make Time Turn-On Time Turn-Off Time POWER SUPPLY Supply Voltage Range Supply Current (Note 9)
tOFFSD tBBM tONSE tOFFSE V+ I+
VNO_ _ = 2.5V, TA = TMIN to TMAX VNO_ _ = 2.5V, RL = 5k, CL = 35pF VNO_ _ = 2.5V, RL = 300, CL = 35pF TA = TMIN to TMAX All logic inputs = 0 or V+, TA = TMIN to TMAX
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 2)
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_ _ = 1V, V+ = 2.7V ICOM_ = 4mA, VNO_ _ = 1V, V+ = 2.7V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 3 0 30 V+ 60 80 5 7 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 MAX4562/MAX4563
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; VNO_ _ = 1V, 1.5V, 2V; V+ = 2.7V VCOM_ = 0.5V, 3V; VNO_ _ = 3V, 0.5V; V+ = 3.6V VCOM_ = 0.5V, 3V; VNO_ _ = 3V, 0.5V; V+ = 3.6V VCOM_ = 3V, 0.5V; VNO_ _ = 3V, 0.5V, or floating; 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 -1 -10 -1 -10 -1 -10 0.002 0.001 0.001 MIN TYP 3 MAX 6 8 1 nA 10 1 nA 10 1 nA 10 UNITS
NO_ _ Off-Leakage Current (Notes 6, 10)
INO_ _(OFF)
COM_ Off-Leakage Current (Notes 6, 10)
ICOM_(OFF)
COM _ On-Leakage Current (Notes 6, 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, VNO_ _ = 0.5VRMS, VNO_ _ = 1.5V
RL = 600 RL = 10k
0.1 0.01 80 85
% dB dB
VNO_ _ = 0.5VRMS, fIN = 20kHz, RL = 600, Figure 1 VNO_ _ = 0.5VRMS, fIN = 20kHz, RS = 600, Figure 1
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 fIN = 1MHz VNO_ _ = 1.5V, RL = 5k, CL = 35pF TA = +25C TA = TMIN to TMAX
-50 -55 200 10 400 200 10 100 12 3 800 1000 350 500
dB dB MHz pF
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Notes 8, 12, and Figure 2) Turn-On Time Turn-Off Time Break-Before-Make Time Turn-On Time Turn-Off Time tONSD tOFFSD tBBM tONSE tOFFSE ns ns ns ms ms
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 VNO_ _ = 1.5V, RL = 300, CL = 35pF
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Notes 8, 12, and Figure 2)
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 CONDITIONS MIN TYP MAX 0.8 0.6 3 2 0.2 Digital inputs = 0 or V+ f = 1MHz ISINK = 6mA ISOURCE = 0.5mA V+ - 0.5 -1 0.001 5 0.4 1 UNITS DIGITAL INPUTS (SCLK, DIN, CS, SCL, SDA, A0, A1) V+ = 5V Input Low Voltage VIL V+ = 3V 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 VIH VHYST ILEAK CIN V+ = 5V V+ = 3V
MAX4562/MAX4563
V V V A pF
2-WIRE TIMING CHARACTERISTICS
(Figure 3, V+ = +2.7V to +5.25V, fSCL = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SCL Clock Frequency Bus Free Time between Stop and Start Conditions Hold Time After Start Condition Stop Condition Setup Time Data Hold Time Data Setup Time Clock Low Period Clock High Period SCL/SDA Rise Time SCL/SDA Fall Time Pulse Width of Suppressed Spike SYMBOL fSCL tBUF tHD:STA tSU:STO tHD:DAT tSU:DAT tLOW tHIGH tR tF The first clock is generated after this period CONDITIONS V+ = 2.7V to 5.25V V+ = 4.75V to 5.25V 4.7 4.0 4.0 0 250 4.7 4.0 20 + 0.1Cb 20 + 0.1Cb 0 300 300 50 MIN 0 TYP MAX 100 400 UNITS kHz s s s s ns s s ns ns ns
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5
Serially Controlled, Clickless Audio/Video Switches MAX4562/MAX4563
3-WIRE TIMING CHARACTERISTICS
(Figure 5, V+ = +2.7V to +5.25V, fOP = 2.1MHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Operating Frequency DIN to SCLK Setup DIN to SCLK Hold CS Fall to SCLK Rise Setup CS Fall to SCLK Rise Hold SCLK Pulse Width Low SCLK Pulse Width High Rise Time (SCLK, DIN, CS) Fall Time (SCLK, DIN, CS) SCLK Fall to Output Data Valid CS Pulse Width High Note 2: Note 3: Note 4: Note 5: SYMBOL fOP tDS tDH tCSS tCSH tCL tCH tR tF tDO tCSW CLOAD = 50pF 40 CONDITIONS V+ = 2.7V to 5.25V V+ = 4.75V to 5.25V MIN 0 100 0 100 0 200 200 2 2 200 TYP MAX 2.1 10 UNITS MHz ns ns ns ns ns ns s s 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). 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 clock's falling edge preceding the ACK signal for 2-wire and from the rising edge of CS for 3-wire. Turn-off 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 defined at the output of the switch for a 0.5V change and 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 12mA total supply transient current requirement. Note 10: Leakage testing is guaranteed by testing with a +5.25V supply. Note 11: Cb = capacitance of one bus line in pF. Tested with Cb = 400pF. Note 12: Typical values are for MAX4563 devices.
Typical Operating Characteristics
(V+ = +5V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. COM_ VOLTAGE
MAX4562 otc01
ON-RESISTANCE vs. COM_ VOLTAGE AND TEMPERATURE
MAX4562 TOC02
LEAKAGE CURRENT vs. TEMPERATURE
MAX4562/3toc03
31 29 ON-RESISTANCE () 27 25 23 21 19 17 15 0 1 2 3 4 5 VCOM_ (V) V+ = 5.0V V+ = 3.3V V+ = 2.7V
21 20 19 ON-RESISTANCE () 18 17 16 15 14 13 12 0 1 2 3 4 5 VCOM_ (V) TA = +70C TA = +25C TA = +85C
1000
100 CURRENT (pA)
COM_OFF
10
COM_ON NO_ _OFF
1 TA = -40C 0.1 -40 -15 10 35
60
85
TEMPERATURE (C)
6
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Serially Controlled, Clickless Audio/Video Switches
Typical Operating Characteristics (continued)
(V+ = +5V, TA = +25C, unless otherwise noted.)
TURN-ON AND TURN-OFF TIMES vs. TEMPERATURE (HARD MODE)
MAX4562/3toc06 MAX4562 toc05
MAX4562/MAX4563
SUPPLY CURRENT vs. TEMPERATURE
MAX4562/3toc04
CHARGE INJECTION vs. COM_ VOLTAGE
3 2 1 TIME (ns) Q (pC) 0 -1 -2 -3 300 250 200 150 100 50 0 0 1 2 3 4 5 -40
5.7 5.6 SUPPLY CURRENT (A) 5.5 5.4 5.3 5.2 5.1 -40 -15 10 35 60
tON, V+ = +3V
tON, V+ = +5V
tOFF, V+ = +3V tOFF, V+ = +5V
85
-15
10
35
60
85
TEMPERATURE (C)
VCOM_ (V)
TEMPERATURE (C)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
600 IN AND OUT SIGNAL = 1VRMS
MAX4562 toc07
AUDIO FREQUENCY RESPONSE
600 IN AND OUT -20 -40
MAX4526 toc08
VIDEO FREQUENCY RESPONSE
MAX4562 toc09
1
0
0 INSERTION LOSS
-20
THD+N (%)
0.1
LOSS (dB)
-60 OFF-ISOLATION -80 CROSSTALK -100
LOSS (dB)
-40 OFF-ISOLATION CROSSTALK -80 50 IN AND OUT
-60
0.01 10 100 1000 FREQUENCY (Hz) 10,000 100,000
-120 10 100 1k FREQUENCY (Hz) 10k 100k
-100 0.1 1 10 100 FREQUENCY (MHz)
TURN-ON AND TURN-OFF TIMES (SOFT MODE)
MAX4562 toc10
TURN-ON AND TURN-OFF TIMES (HARD MODE)
MAX4562 toc13
CS (5V/div) tON (1V/div)
CS (5V/div)
tON (1V/div) tOFF (1V/div)
tOFF (1V/div)
5ms/div
100ns/div
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7
Serially Controlled, Clickless Audio/Video Switches MAX4562/MAX4563
Typical Operating Characteristics (continued)
(V+ = +5V, TA = +25C, unless otherwise noted.)
SOFT-MODE RISE TIME
MAX4562 toc11
SOFT-MODE FALL TIME
MAX4562 toc12
AMPLITUDE (500mV/div)
500s/div
AMPLITUDE (500mV/div)
500s/div
Pin Description
PIN MAX4562 1 2, 4, 6, 8, 10, 12 3, 7, 9, 11 5 13 - 14 - 15 - 16 - MAX4563 1 2, 4, 6, 8, 10, 12 3, 7, 9, 11 5 - 13 - 14 - 15 - 16 NAME V+ NO1A, NO1B, NO2A, NO2B, NO3, NO4 COM1-COM4 GND A1 DOUT A0 CS SDA DIN SCL SCLK Positive Supply Voltage Normally Open Terminals Common Terminals Ground LSB + 2 of 2-Wire Serial Interface Address Field Data Input of 3-Wire Serial Interface LSB + 1 of 2-Wire Serial Interface Address Field Chip-Select of 3-Wire Serial Interface Data Input of 2-Wire Serial Interface Data Input of 3-Wire Serial Interface Clock Input of 2-Wire Serial Interface Clock Input of 3-Wire Serial Interface FUNCTION
8
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Serially Controlled, Clickless Audio/Video Switches MAX4562/MAX4563
10nF
V+
MAX4562 MAX4563
10nF
V+
ANALYZER RL SIGNAL GENERATOR 0dBm
COM_V+ 2/3 DECODER/ CONTROLLER NO_ _ GND ANALYZER RL SIGNAL GENERATOR 0dBm
V+ COM1 NO1 B 2/3 N.C.
DECODER/ CONTROLLER NO2A GND COM2
50
a) OFF-ISOLATION
b) CROSSTALK
Figure 1. Off-Isolation and Crosstalk
ACKNOWLEDGE BIT 3V
MAX4562 MAX4563
V+ 10nF 2-WIRE
SCL 0 VOUT 0 V+ VOUT COM _ VOUT RL 300 DECODER/ CONTROLLER SERIAL INTERFACE GND 3-WIRE 0 CL 35pF 3V CS 0 VOUT 0
50%
tR < 20ns tF < 20ns
-0.5V tON VOUT - 0.5V tOFF
VNO_ _
NO_ _
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 MAX4562/MAX4563
Detailed Description
The MAX4562/MAX4563 are serial-interface controlled switches with soft-mode "clickless" and hard-mode operating capability. The MAX4562/MAX4563 contain two SPST switches and two 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 Configuration. Each switch is controlled independently by either the 2-wire I2C-compatible or 3-wire SPI/QSPI/MICROWIRE-compatible serial interface. Audio off-isolation and crosstalk is -85dB at 20kHz. Video off-isolation and crosstalk is at least -55dB at 10MHz. Each switch of either 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 and open are the power-up default states 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 +2.7V to +5.5V single supply. The MAX4562 features a 2-wire I2C-compatible serial interface, and the MAX4563 features a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface.
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
SLAVE ADDRESS BYTE SDA MSB SCL START CONDITION LSB ACK MSB
COMMAND BYTE
LSB
ACK
STOP CONDITION
Figure 4. A Complete 2-Wire Serial-Interface Transmission
10
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Serially Controlled, Clickless Audio/Video Switches
Table 1. Command-Bit Mapping
C1 0 0 1 1 C0 0 1 0 1 COMMAND NO_OP NO_OP SWITCHSET MODESET No Operation No Operation Sets specified switches open or closed. Sets specified switches to soft or hard mode. DESCRIPTION
MAX4562/MAX4563
Table 2. Control-Bit Mapping
CONTROL BIT D5 D4 D3 D2 D1 D0 (LSB) SWITCH SW1A SW1B SW2A SW2B SW3 SW4 SWITCH TERMINAL 2, 3 3, 4 6, 7 7, 8 9, 10 11, 12
Applications Information
Switch Control
The MAX4562/MAX4563 have a common commandand control-bit structure; the only difference is the interface type (2-wire or 3-wire). The SWITCHSET command controls the open/closed states of the various switches. MODESET controls soft/hard-mode switch states. The NO_OP command is useful for daisy-chaining multiple 3-wire parts. Table 1 shows the command bits' configuration and their related commands. Table 2 shows the configuration of the data bits and their related switches. After a SWITCHSET command is issued, a logic "1" in any data-bit 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 soft mode, while a logic "0" sets it into hard mode.
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 GND or drive them with CMOS logic levels. The second byte is the command byte, which sets the command being written to the device. The possible commands are MODESET and SWITCHSET. 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 or command, are sent MSB first. The MAX4562/MAX4563 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 the 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 the command byte. The device also issues a similar acknowledgment after the command byte. 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.
3-Wire Serial Interface
The MAX4563 uses a 3-wire SPI/QSPI/MICROWIRE-compatible serial interface. An active-low chip select (CS) pin 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 serial clock signal (SCLK) MSB first. A total of eight bits is needed in each write cycle. The command code is contained in the two MSBs of the 8-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 MAX4563's internal register, initiating the device's change of state. Table 4 shows the details of the 3-wire interface structure.
2-Wire Serial Interface
The MAX4562 uses a 2-wire I2C-compatible serial interface, requiring only two I/O lines of a standard microprocessor port for communication. These devices use a SendByteTM protocol. The SendByte protocol consists of one byte of address field followed by one byte of command field. The first byte of any 2-wire serial-interface transaction is always the address byte. To address a given chip, the
SendByte is a trademark of Philips Corp.
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Serially Controlled, Clickless Audio/Video Switches MAX4562/MAX4563
Table 3. MAX4562 2-Wire Serial-Interface Data Format
ADDRESS BYTE MSB SRT 1 0 0 1 1 A1 LSB A0 0 ACK MSB C1 C0 SW2A SW1B SW2A SW2B COMMAND BYTE LSB SW3 SW4 ACK STP
STP = Stop Condition Logic "0" in any data bit location places the associated switch open or in hard switching mode. Logic "1" in any data bit location places the associated switch closed or in soft (clickless) switching mode. See Table 1 for command-bit configuration.
Table 4. MAX4563 3-Wire Serial-Interface Data Format
COMMAND MSB D7 C1 D6 C0 D5 D4 D3 D2 D1 SW3 SW1A SW1B SW2A SW3B SWITCH CONTROL LSB D0 SW4
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 soft "clickless" mode, while a logic "0" sets it into hard mode. For command-bit configurations, see Table 1.
Data are shifted through the MAX4563 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, do not use the DOUT pin and connect the DIN pins of all devices 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 line is then brought high to execute the command. For command bit configuration see Table 1.
T-Switches
Configure the MAX4562/MAX4563 as a T-switch to improve off-isolation. As the signal frequency is increased, parasitic capacitance significantly degrades the off-isolation. Figure 7 shows a typical T-switch configuration using the MAX4562/MAX4563 to improve offisolation. COM2 and COM3 are tied together to create a single common node. NO2A and NO2B act as the input and output of the T-switch, while NO3 is tied to ground. When both SW2A and SW2B are closed, SW3 should be open to allow the signal to pass into NO2A and out of NO2B. However, when SW2A and SW2B are open, energy that is coupled through the open switches is shunted to ground through SW3, which should now be closed. This increases the off-isolation to typically -68dB at 10MHz (Figure 8).
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 eight 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 MAX4563 devices, daisy-chain the shift registers by connecting DOUT of the first device to DIN of the second, etc. Connect the CS pins of all devices together.
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Serially Controlled, Clickless Audio/Video Switches MAX4562/MAX4563
CS 20% tCSS SCLK tDS DIN D7 D6 D1 tDO DOUT D0 20% tDH tCL 20% tCH 20% 20% 70% 70% 20% 70% 20% tCSH tCSW 70% tCSO
Figure 5. 3-Wire Serial-Interface Timing Diagram
SWITCHES UPDATED CS -20 SCLK OFF-ISOLATION (dB) DATA CLOCKED IN DIN D7 MSB INPUT DATA BITS DATA CLOCKED OUT DOUT D7 D6 D5 D4 D3 D2 D1 D0 DATA BITS FROM PREVIOUS DATA INPUT DOUT POWER-UP DEFAULT: D7-D0 = 0 D7 -120 0.1 1 10 100 FREQUENCY (MHz) D6 D5 D4 D3 D2 D1 D0 LSB
-40 SPST SWITCH
-60
-80 -100 T-SWITCH
Figure 8. Off-Isolation vs. Frequency Figure 6. A Complete 3-Wire Serial-Interface Transmission
___________________Chip Information
SIGNAL IN NO2A COM2 COM3 NO2B
TRANSISTOR COUNT: 3518
SIGNAL OUT
NO3
Figure 7. T-Switch Configuration
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Serially Controlled, Clickless Audio/Video Switches MAX4562/MAX4563
Package Information
QSOP.EPS
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Serially Controlled, Clickless Audio/Video Switches
NOTES
MAX4562/MAX4563
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Serially Controlled, Clickless Audio/Video Switches MAX4562/MAX4563
NOTES
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.

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