View MAX4550-MAX4570_29963.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-1397; Rev 0; 10/98
KIT ATION EVALU LE B AVAILA
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
General Description Features
o Selectable Soft Switching Mode for Clickless Audio Operation o 43 Typical On-Resistance (5V Supplies) o 5 Typical On-Resistance Matching Between Channels o 4 Typical On-Resistance Flatness o 0.014% Total Harmonic Distortion with 1k Load o -110dB Off-Isolation at 20kHz -78dB Off-Isolation at 4MHz o -95dB Crosstalk at 20kHz -54dB Crosstalk at 4MHz o Serial Interface 2-Wire, Fast-Mode, I2C-Compatible (MAX4550) 3-Wire, SPI/QSPI/MICROWIRE-Compatible (MAX4570) o Four Auxiliary Outputs that Extend P Ports o Single-Supply Operation: +2.7V to +5.5V Dual-Supply Operation: 2.7V to 5.5V
MAX4550/MAX4570
The MAX4550/MAX4570 serial-interface, 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 80 on-resistance, 10 on-resistance matching between channels, 5 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 SPITM/QSPITM or MICROWIRETM-compatible serial interface. These parts are available in 28-pin SSOP and wide SO packages and are tested over either the commercial (0C to +70C) or extended (-40C to +85C) operating temperature range.
Pin Configuration
TOP VIEW
SB 1 NO3A 2 NO3B 3 BIASH 4 28 SA 27 NO2B 26 NO2A 25 V24 V+
Applications
Set-Top Boxes PC Multimedia Boards High-End Audio Systems Video Conferencing Systems
Ordering Information
PART MAX4550CAI MAX4550CWI MAX4550EAI MAX4550EWI MAX4570CAI MAX4570CWI MAX4570EAI MAX4570EWI TEMP. RANGE 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C 0C to +70C -40C to +85C -40C to +85C PIN-PACKAGE 28 SSOP 28 Wide SO 28 SSOP 28 Wide SO 28 SSOP 28 Wide SO 28 SSOP 28 Wide SO
BIASL 5 NO4A 6 NO4B 7 V+ 8 COM2A 9 Q0 10 COM2B 11 Q1 12 A0 (CS) 13 SCL (SCLK) 14
MAX4550 MAX4570
23 NO1B 22 NO1A 21 GND 20 COM1A 19 Q3 18 COM1B 17 Q2 16 A1 (DOUT) 15 SDA (DIN)
I2C is a trademark of Philips Corp. SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
SO/SSOP
( ) ARE FOR MAX4570.
Functional Diagram appears at end of data sheet.
1
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
ABSOLUTE MAXIMUM RATINGS
V+ to GND ............................................................... -0.3V to +6V V+ to V-................................................................-0.3V to +13.2V V- to GND .................................................................+0.3V to -6V NO_ _ , S_, BIAS_, COM_ _, Q_, A1, DOUT to GND (Note 1)...............................................(V- - 0.3V) to (V+ + 0.3V) CS, SCLK, DIN, SCL, SDA, A0 to GND ....................-0.3V to +6V Continuous Current into Any Terminal..............................10mA Peak Current, NO_ _ , S_ , COM_ _ (pulsed at 1ms, 10% duty cycle max) ..........................40mA Continuous Power Dissipation (TA = +70C) 28-Pin SSOP (derate 9.52mW/C above +70C) .........762mW 28-Pin Wide SO (derate 12.5mW/C above +70C) ...1000mW Operating Temperature Ranges MAX4550C_I/MAX4570C_I ...............................-0C to +70C MAX4550E_I/MAX4570E_I ..............................-40C to +85C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C
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 = +25C.) (Note 2) PARAMETER ANALOG SWITCHES Analog Signal Range (Note 3) VNO_ _, VCOM_ _, VS_ RON ICOM_ _ = 4mA, VNO_ _ or VS_ = 3.0V, V+ = 4.75V, V- = -4.75V ICOM_ _ = 4mA, VNO_ _ or VS_ = 3.0V, V+ = 4.75V, V- = -4.75V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 4 5 V43 V+ 80 100 10 10 5 8 -1 -10 -5 -10 -5 -20 0.01 0.01 0.01 1 nA TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 10 5 nA 10 5 nA 20 V SYMBOL CONDITIONS MIN TYP MAX UNITS
On-Resistance COM_ _ to NO_ _ or S_ On-Resistance Match Between Channels (Note 4) COM_ _ to NO_ _ or S_ On-Resistance Flatness (Note 5) NO_ _ or S_ Off-Leakage Current (Note 6) COM_ _ Off-Leakage Current (Note 6) COM_ _ On-Leakage Current (Note 6) AUDIO PERFORMANCE Total Harmonic Distortion plus Noise Off-Isolation (Note 7) Channel-to-Channel Crosstalk Channel-to-Channel Crosstalk
RON
ICOM_ _ = 4mA; TA = +25C RFLAT(ON) VNO_ _ or VS_ = 3.0V, 0; TA = TMIN to TMAX V+ = 4.75V; V- = -4.75V NO_(OFF) VNO_ _ or VS_ = 4.5V, - VCOM_ = +4.5V, V+ = 5.25V, V- = -5.25V VNO_ _ or VS_ = 4.5V, - VCOM_ = +4.5V, V+ = 5.25V, V- = -5.25V VNO_ _ or VS_ = floating, VCOM_ = 4.5V, V+ = 5.25V, V- = -5.25V TA = +25C
ICOM_(OFF)
ICOM_(ON)
THD+N VISO(A) VCTA(A) VCTA(A)
fIN = 1kHz, RL = 1k, VNO_ or VS_ = 1VRMS, VNO_ or VS_ = 0 VNO = 1VRMS, fIN = 20kHz, RL = 10k, S = GND Shunt switch on Shunt switch off
0.014 -110 -80 -95
% dB dB
ICOM_ or= S_ = 1VRMS, fIN = 20kHz, VNO_ _ _ V 1mA RL = 10k, three channels driven at 20kHz
2
_______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
ANALOG ELECTRICAL CHARACTERISTICS--Dual Supplies (continued)
(V+ = +5V 5%, V- = -5V 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER VIDEO PERFORMANCE Off-Isolation VISO(V) VCT(V) BW COFF(NO) tONSD tOFFSD tBBM tONSE tOFFSE RBIAS V+ VI+ IReset condition, V+ = 2.7V to 5.25V Reset condition, V- = -5.25V to 0 VNO_ _ or VS_ = 1VRMS, fIN = 4MHz, RL = 1k, S_ = GND Shunt switch on Shunt switch off -78 dB -63 -54 14 11 400 200 10 100 36 11 13 2.7 -5.25 7 20 27 5.25 0 20 -20 900 500 dB MHz pF ns ns ns ms ms k SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4550/MAX4570
Channel-to-Channel Crosstalk 0.1dB Bandwidth Off-Capacitance Turn-On Time (Note 9) Turn-Off Time (Note 9) Break-Before-Make Time Turn-On Time Turn-Off Time BIAS NETWORKS Bias Network Resistance POWER SUPPLIES Supply Voltage Range V+ Supply Current (Note 10) V- Supply Current
VNO_ _ or VS_ = 1VRMS, fIN = 4MHz, RL = 10, three channels driven at 4MHz RS = 75, RL = 1k fIN = 1MHz, VNO_ _ or VS_ = 1.5V, RL = 5k VNO_ _ or VS_ = 1.5V, RL = 300 VNO_ _ or VS_ = 1.5V VNO_ _ or VS_ = 1.5V, RL = 5k VNO_ _ or VS_ = 1.5V, RL = 300 BIASH to BIASL
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note 8)
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 5)
V A A
ANALOG ELECTRICAL CHARACTERISTICS--Single +5V Supply
(V+ = +5V 5%, V- = 0, 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_ _, VS_ RON ICOM_ _ = 4mA, VNO_ _ or VS_ = 3.0V, V+ = 4.75V ICOM_ _ = 4mA, VNO_ _ or VS_ = 3.0V, V+ = 4.75V ICOM_ _ = 4mA; VNO_ _ or VS_ = 1V, 2V, 3V; V+ = 4.75V 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 0.01 4 5 0 60 V+ 100 130 10 10 10 15 1 nA 10 3 V SYMBOL CONDITIONS MIN TYP MAX UNITS
On-Resistance
On-Resistance Match Between Channels (Note 4) On-Resistance Flatness (Note 5) NO_ _ or S_ Off-Leakage Current (Notes 6, 11)
RON
RFLAT
VNO or VS_ = 4.5V, 1V; INO_ _(OFF) VCOM_ _ = 1V, 4.5V; V+ = 5.25V
_______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
ANALOG ELECTRICAL CHARACTERISTICS--Single +5V Supply (continued)
(V+ = +5V 5%, V- = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER COM_ _ Off-Leakage Current (Notes 6, 11) COM_ _ On-Leakage Current (Notes 6, 11) AUDIO PERFORMANCE Total Harmonic Distortion plus Noise Off-Isolation (Note 7) Channel-to-Channel Crosstalk VIDEO PERFORMANCE Off-Isolation (Note 7) Channel-to-Channel Crosstalk 0.1dB Bandwidth Off-Capacitance Turn-On Time (Note 9) Turn-Off Time (Note 9) Break-Before-Make Time Turn-On Time Turn-Off Time BIAS NETWORKS Bias Network Resistance RBIAS BIASH to BIASL 13 20 27 k VISO(V) VTC(V) BW COFF(NO) tONSD tOFFSD tBBM tONSE tOFFSE VNO_ _ or VS_ = 1VRMS, fIN = 4MHz, RL = 1k, S = GND Shunt switch on Shunt switch off -74 -61 -52 13 11 400 160 10 100 43 14 900 500 dB dB MHz pF ns ns ns ms ms THD+N VISO(A) VTC(A) fIN = 1kHz, RL = 10k, VNO_ _ or VS_ = 1VRMS, VNO_ _ or VS_ = 2.5V VNO_ _ or VS_ = 1VRMS, fIN = 20kHz, RL = 10k, S = GND Shunt switch on Shunt switch off 0.014 -105 -80 -97 % dB dB SYMBOL CONDITIONS TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX MIN -5 -10 -5 -20 0.01 TYP 0.01 MAX 5 nA 10 5 nA 20 UNITS VNO_ _ or VS_ = 4.5V, 1V; ICOM_ _(OFF) VCOM_ _ = 1V, 4.5V; V+ = 5.25V VNO_ _ or VS_ = floating; ICOM_ _(ON) VCOM_ _ = 1V, 4.5V; V+ = 5.25V
VNO_ _ or VS_ = 1VRMS, fIN = 20kHz, RL = 10k, three channels driven at 20kHz
VNO_ _ or VS_ = 1VRMS, fIN = 4MHz, RL = 10k, three channels driven at 4MHz RSOURCE = 75, RL = 1k fIN = 1MHz VNO_ _ or VS_ = 1.5V, RL = 5k VNO_ _ or VS_ = 1.5V, RL = 300 VNO_ _ or VS_ = 1.5V VNO_ _ or VS_ = 1.5V, RL = 5k VNO_ _ or VS_ = 1.5V, RL = 300
DYNAMIC TIMING WITH CLICKLESS MODE DISABLED (Note 8)
DYNAMIC TIMING WITH CLICKLESS MODE ENABLED (Note 8, Figure 5)
ANALOG ELECTRICAL CHARACTERISTICS--Single +3V Supply
(V+ = +3V 10%, V- = 0, 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_ _, VS_ RON ICOM_ _ = 4mA, VNO_ _ or VS_ = 1V, V+ = 2.7V TA = +25C TA = TMIN to TMAX 0 106 V+ 180 220 V SYMBOL CONDITIONS MIN TYP MAX UNITS
On-Resistance
4
_______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
INTERFACE I/O CHARACTERISTICS
(V+ = +2.7V to +5.5V, V- = 0 to -5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 2) PARAMETER AUXILIARY OUTPUTS Output High Voltage Output Low Voltage VOH VOL ISOURCE = 1mA to GND, V+ = 4.75V ISOURCE = 0.5mA to GND, V+ = 2.7V ISINK = 6mA, V+ = 2.7V ISINK = 12mA, V+ = 4.75V V+ > 3.6V V+ < 3.6V V+ > 3.6V V+ < 3.6V 0.2 VNO_ _ = 0 or 5V -1 0.01 5 ISINK = 6mA ISINK = 6mA ISOURCE = 0.5mA V+ = 4.75V V+ = 2.7V V+ - 0.5 V+ - 0.1 DC 1.3 0.6 0 100 1.3 0.6 20 + 0.1Cb 20 + 0.1Cb DC 100 0 CLOAD = 50pF 20 100 0 200 300 300 0.9 400 0.4 0.8 1 3.0 2.0 0.8 0.6 4.45 2.3 4.65 2.5 0.5 0.5 1.0 1.0 V V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4550/MAX4570
DIGITAL INPUTS (SCK, DIN, CS, SCL, SDA) Input High Voltage Input Low Voltage Input Hysteresis Input Leakage Current (Note 7) Input Capacitance DIGITAL OUTPUTS (DOUT, SDA) Output Low Voltage DOUT Output High Voltage SCL Clock Frequency Bus Free Time between Stop and Start Condition STOP Condition Setup Time Data Hold Time Data Setup Time Clock Low Period Clock High Period SCL/SDA Rise Time (Note 12) SCL/SDA Fall Time (Note 12) Operating Frequency DIN to SCLK Setup DIN to SCLK Hold SCLK Fall to Output Data Valid CS to SCLK Rise Setup CS to SCLK Rise Hold VOL VOH fSCL tBUF tSU:STO tHD:DAT tSU:DAT tLOW tHIGH tR tF V V kHz s s s ns s s ns ns VIH VIL VHYST ILEAK CNO V V V A pF
I2C TIMING (V+ = +4.75V to +5.25V, Figures 1, 2)
SPI TIMING (V+ = +4.75V to +5.25V, Figures 3, 4) fOP fDS fDH fDO fCSS fCSH 2.1 MHz ns ns ns ns ns
_______________________________________________________________________________________
5
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
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 = +25C.) (Note 2) PARAMETER SCLK Pulse Width Low SCLK Pulse Width High Rise Time (SCLK, DIN, CS) Fall Time (SCLK, DIN, CS) Note 2: Note 3: Note 4: Note 5: SYMBOL tCH tCL tR tF CONDITIONS MIN 200 200 2.0 2.0 TYP MAX UNITS ns ns s s
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 = +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 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 300 load to ground. Turn-On Time is measured with a 5k 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.
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM (DUAL SUPPLIES)
AMX4550/4570-01
ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES)
AMX4550/4570-02
ON-RESISTANCE vs. VCOM (SINGLE SUPPLY)
120 110 RON () 100 90 80 70 V+ = +3.3V V+ = +5V
AMX4550/4570-03
60 58 56 54 RON () V = 3.3V V = 2.7V
60 V = 5V 55 TA = +85C 50 RON () TA = +70C 45 40 TA = +25C
130 V+ = +2.7V
52 50 48 46 44 42 40 -5 -4 -3 -2 -1 0 1 2 3 4 5 VCOM (V) V = 4.75V
35 TA = -40C 30 -5 -4 -3 -2 -1 0 1 2 3 4 5 VCOM (V)
60 50 0 1 2 3
4
5
VCOM (V)
6
_______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
MAX4550/MAX4570
ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY)
AMX4550/4570-04
ON-RESISTANCE vs. TEMPERATURE
AMX4550/4570-05
LEAKAGE CURRENT vs. TEMPERATURE
V = 5V 1000 LEAKAGE CURRENT (pA) NO_OFF 100 COM_ON
AMX4550/4570-06
75 70 65 RON () 60 55 50 45 40 0 1 2 3 TA = -40C TA = +70C TA = +85C
V+ = +5V V- = 0
70 65 60 RON () 55 50 45 V = 5V 40 35 30 V+ = +5V V- = 0
10,000
TA = +25C
10 COM_OFF
1
0.1 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 TEMPERATURE (C) TEMPERATURE (C)
4
5
VCOM (V)
SUPPLY CURRENT vs. TEMPERATURE (DUAL SUPPLIES)
AMX4550/4570-07
SUPPLY CURRENT vs. TEMPERATURE (SINGLE SUPPLY)
AMX4550/4570-08
CHARGE INJECTION vs. VCOM
16 14 12 Q (pC) 10 8 6 V+ = +5V V- = 0 V = 5V
AMX4550/4570-09
10 9 SUPPLY CURRENT (A) 8 7 6 5 4 3 2 1 -40 -20 0 20 40 60 IV+ = 5V I+
10 9 SUPPLY CURRENT (A) 8 7 6 5 4 3 2 1 V+ = +2.7V V+ = +5V V- = 0
18
4 2 0
80
-40
-20
0
20
40
60
80
-5 -4
-3
-2 -1
0
1
2
3
4
5
TEMPERATURE (C)
TEMPERATURE (C)
VCOM (V)
TURN-ON/TURN-OFF TIMES vs. SUPPLY VOLTAGE (DUAL SUPPLIES)
AMX4550/4570-11
TURN-ON/TURN-OFF TIMES vs. SUPPLY VOLTAGE (SINGLE SUPPLY)
AMX4550/4570-10
OFF-ISOLATION AND CROSSTALK vs. FREQUENCY
10 0 -10 CROSSTALK (dB) -20 -30 -40 -50 -60 CROSSTALK OFF-ISOLATION V = 5V
AMX4550/4570-12
1000 900 800 TIME (ns) 700 600 500 400 300 200 2.7 3.1 3.5 3.9 4.3 4.7 5.1 tOFF tON
1200 1100 1000 900 TIME (ns) 800 700 600 500 400 300 200 tOFF tON
-30 -40 -50 ISOLATION (dB) -60 -70 -80 -90 -100 -110 -120 -130
-70 -80 -90
5.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
0.5 1
10 FREQUENCY (MHz)
100
VSUPPLY (V)
VSUPPLY (V)
_______________________________________________________________________________________
7
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
FREQUENCY RESPONSE
AMX4550/4570-13
FREQUENCY RESPONSE
AMX4550/4570-14
1 0 LOSS (1dB/div) -1
V = 5V
0.15 0.10 0.05 LOSS (dB) 0 -0.05 -0.10 -0.15 -0.20 -0.25 -0.30
V = 5V
RLOAD = 10k V = 5V
-2 -3 -4 -5 -6 -7 -8 0.5 1 10 FREQUENCY (MHz) 100 500
THD+NOISE (%)
0.01
0.5
1
2
5
10
20
0.001 1 10 100 1000 10,000 100,000 FREQUENCY (Hz)
FREQUENCY (MHz)
COM RISE TIME (SOFT MODE)
AMX4550/4570-16
COM FALL TIME (SOFT MODE)
AMX4550/4570-17
COM TURN-ON TIME (HARD MODE)
V = 5V CS 1V/div
AMX4550/4570-18
V = 5V
V = 5V
200mV/ div
200mV/ div
0
COM 0.5V/div
0 500s/div
0 500s/div
0 50ns/div
COM TURN-OFF TIME (HARD MODE)
AMX4550/4570-19
COM TURN-ON TIME (SOFT MODE)
AMX4550/4570-20
COM TURN-OFF TIME (SOFT MODE)
V = 5V CS 1V/div
AMX4550/4570-21
V = 5V CS 1V/div
V = 5V CS 1V/div
0 COM 0.5V/div
0 COM 0.5V/div 0
0 COM 0.5V/div
0 25ns/div 5ms/div
0 5ms/div
8
_______________________________________________________________________________________
AMX4550/4570-15
2
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
0.1
0.20
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
Pin Description
PIN NAME MAX4550 1 2 3 4 5 6 7 8, 24 9 10 11 12 13 -- 14 -- 15 -- 16 -- 17 18 19 20 21 22 23 25 26 27 28 MAX4570 1 2 3 4 5 6 7 8, 24 9 10 11 12 -- 13 -- 14 -- 15 -- 16 17 18 19 20 21 22 23 25 26 27 28 SB NO3A NO3B BIASH BIASL NO4A NO4B V+ COM2A Q0 COM2B Q1 A0 CS SCL SCLK SDA DIN A1 DOUT Q2 COM1B Q3 COM1A GND NO1A NO1B VNO2A NO2B SA 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. 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). 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). 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 externally. Output 2 of Crosspoint A Auxiliary Output 0 Output 2 of Crosspoint B Auxiliary Output 1 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. 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 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 Ground 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 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. FUNCTION
MAX4550/MAX4570
_______________________________________________________________________________________
9
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
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 80 on-resistance, 10 on-resistance matching between channels, 5 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. 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 C7 C6 C5 C4 C3 C2 C1 C0 Don't care Don't care BIAS/MODE AUX COM2B COM1B COM2A COM1A REGISTER
__________ 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.
Table 2. COM Data-Byte Format (C0, C1, C2, C3 = "1")
BIT D7 D6 D5 D4 D3 D2 D1 D0 Don't care Don't care Don't care Controls the switch connected to S_ ; 1 = close switch, 0 = open switch. Controls the switch connected to NO4_ ; 1 = close switch, 0 = open switch. 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. DESCRIPTION
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
______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
Table 3. AUX_ Data-Byte Format (C4 = "1")
BIT D7 D6 D5 D4 D3 D2 D1 D0 Don't care Don't care Don't care 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. DESCRIPTION
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.
MAX4550/MAX4570
Table 4. Clickless Mode/BIAS_ Data-Byte Format (C5 = "1")
BIT D7 D6 D5 D4 D3 D2 D1 D0 DESCRIPTION Controls COM2B clickless mode; 1 = enables clickless mode, 0 = disables clickless mode. Controls COM1B clickless mode; 1 = enables clickless mode, 0 = disables clickless mode. Controls COM2A clickless mode; 1 = enables clickless mode, 0 = disables clickless mode. Controls COM1A clickless mode; 1 = enables clickless mode, 0 = disables clickless mode. Controls COM2B bias resistors; 1 = connect bias resistors, 0 = disconnect bias resistors. Controls COM1B bias resistors; 1 = connect bias resistors, 0 = disconnect bias resistors. Controls COM2A bias resistors; 1 = connect bias resistors, 0 = disconnect bias resistors. Controls COM1A bias resistors; 1 = connect bias resistors, 0 = disconnect bias resistors.
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.
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.
______________________________________________________________________________________
11
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
Table 5. 2-Wire Serial-Interface Data Format
ADDRESS BYTE A 7 S R T 1 A 6 0 A 5 0 A 4 1 A 3 1 A 2 A 1 A 1 A 0 A 0 0 A C K C 7 X C 6 X COMMAND BYTE C 5 B I A S C 4 A U X C 3 C O M 2 B C 2 C O M 1 B C 1 C O M 2 A C 0 C O M 1 A A C K D 7 D 7 D 6 D 6 DATA BYTE D 5 D 5 D 4 D 4 D 3 D 3 D 2 D 2 D 1 D 1 D 0 D 0 A C K S T O P
X = Don't care SRT = Start condition ACK = Acknowledge condition STOP = Stop condition
SCL
SDA SRT
A7
A0 ACK
D7
D0 ACK
D7
D0 ACK STOP
Figure 1. 2-Wire Serial-Interface Timing Diagram
A
tLOW
B
tHIGH
C
D
E
F
G
H
I
J
SCL
SDA
tSU:STA tHD:STA
tSU:DAT
tHD:DAT
tSU:STO tBUF
A = START CONDITION B = MSB OF ADDRESS BYTE C = LSB OF ADDRESS BYTE D = ACKNOWLEDGE CLOCKED INTO MASTER E = MSB OF COMMAND BYTE
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 ______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
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.
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.
MAX4550/MAX4570
CS
SCLK 1 DIN C7 COMMAND BYTE C0 D7 DATA BYTE 16 D0
Figure 3. 3-Wire Serial-Interface Communication
CS
***
tCSH SCLK
tCSS
tCL
tCH
tCSH
*** tDS tDH
DIN tDV DOUT
*** tDO *** tTR
Figure 4. 3-Wire Serial-Interface Timing Details
______________________________________________________________________________________ 13
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
Table 6. 3-Wire Serial-Interface Data Format
COMMAND BYTE MSB C7 X C6 X C5 BIAS C4 AUX C3 COM2B C2 COM1B C1 COM2A C0 COM1A D7 D7 D6 D6 D5 D5 D4 D4 D3 D3 D2 D2 D1 D1 DATA BYTE LSB D0 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
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.
Clickless Switching
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).
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.
14
______________________________________________________________________________________
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches
Functional Diagram
MAX4550/MAX4570
NO1A NO2A NO3A NO4A SA
22 26 2 6 28 SWITCH MATRIX `A' 23 27 3 7 1 SWITCH MATRIX `B' 18 11 COM1B COM2B 20 9 COM1A COM2A
MAX4550 MAX4570
NO1B NO2B NO3B NO4B SB
V+ VGND
8, 24 25 21 10
4
BIASH
10 4
SDA/(DIN) SCL/(SCLK) A0/(CS) A1/(DOUT)
15 14 13 16 4 10 Q0 CONTROL LOGIC BIAS RESISTOR NETWORK 5
BIASL
12
Q1
17
Q2
19
Q3
SWITCH STATES SHOWN IN POWER-UP STATE. AUXILIARY OUTPUTS ARE LOW IN POWER-UP STATE.
AUXILIARY OUTPUTS
( ) ARE FOR MAX4570
______________________________________________________________________________________
15
Serially Controlled, Dual 4x2, Clickless Audio/Video Analog Crosspoint Switches MAX4550/MAX4570
Package Information
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) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX4550-MAX4570

	To Download MAX4550-MAX4570 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .