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19-0219; Rev 2; 6/94
L NUA MA T KIT SHEE N TIO TA LUA S DA EVA LLOW FO
Two-Channel, Triple/Quad RGB Video Switches and Buffers
____________________________Features
o o o o o 100MHz Unity-Gain Bandwidth 90MHz Bandwidth with 2V/V Gain 0.01%/0.03 Differential Gain/Phase Error Drives 50 and 75 Back-Terminated Cable Directly Wide Output Swing: 2V into 75 2.5V into 150 300V/s Slew Rate (2V/V gain) 20ns Channel Switching Time Logic Disable Mode: High-Z Outputs Reduced Power Consumption Outputs May Be Paralleled for Larger Networks 5pF Input Capacitance (channel on or off)
_______________General Description
The MAX463-MAX470 series of two-channel, triple/quad buffered video switches and video buffers combines high-accuracy, unity-gain-stable amplifiers with high-performance video switches. Fast switching time and low differential gain and phase error make this series of switches and buffers ideal for all video applications. The devices are all specified for 5V supply operation with inputs and outputs as high as 2.5V when driving 150 loads (75 back-terminated cable). Input capacitance is typically only 5pF, and channel-tochannel crosstalk is better than 60dB, accomplished by surrounding all inputs with AC ground pins. The onboard amplifiers feature a 200V/s slew rate (300V/s for AV = 2V/V amplifiers), and a bandwidth of 100MHz (90MHz for AV = 2V/V buffers). Channel selection is controlled by a single TTL-compatible input pin or by a microprocessor interface, and channel switch time is only 20ns. For design flexibility, devices are offered with bufferamplifier gains of 1V/V or 2V/V for 75 back-terminated applications. Output amplifiers have a guaranteed output swing of 2V into 75. Devices offered in this series are as follows:
PART MAX463 MAX464 MAX465 MAX466 MAX467 MAX468 MAX469 MAX470 DESCRIPTION Triple RGB Switch & Buffer Quad RGB Switch & Buffer Triple RGB Switch & Buffer Quad RGB Switch & Buffer Triple Video Buffer Quad Video Buffer Triple Video Buffer Quad Video Buffer VOLTAGE GAIN (V/V) 1 1 2 2 1 1 2 2
MAX463-MAX470
o o o
o o
______________Ordering Information
PART MAX463CNG MAX463CWG MAX463C/D MAX463ENG MAX463EWG TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C PIN-PACKAGE 24 Narrow Plastic DIP 24 Wide SO Dice* 24 Narrow Plastic DIP 24 Wide SO
Ordering Information continued on last page. * Dice are specified at TA = +25C, DC parameters only.
_________________Pin Configurations
TOP VIEW
IN0A GND IN1A GND 1 2 3 4 5 6 7 8 9 SWITCH 24 GND
MAX463 MAX465
23 LE 22 EN 21 A0 20 CS 19 V18 OUT0 17 V+ 16 OUT1 15 GND 14 V+ 13 OUT2
________________________Applications
Broadcast-Quality Color-Signal Multiplexing RGB Multiplexing RGB Color Video Overlay Editors RGB Color Video Security Systems RGB Medical Imaging Coaxial-Cable Line Drivers
IN2A VVIN0B GND
IN1B 10 GND 11 IN2B 12
3P2T
DIP/SO Typical Operating Circuit appears at end of data sheet.
Pin Configurations continued at end of data sheet.
1
________________________________________________________________ Maxim Integrated Products
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Two-Channel, Triple/Quad RGB Video Switches and Buffers MAX463-MAX470
ABSOLUTE MAXIMUM RATINGS
Power-Supply Ranges V+ to V- ................................................................................12V Analog Input Voltage ..........................(V- - 0.3V) to (V+ + 0.3V) Digital Input Voltage ...................................-0.3V to (V+ + 0.3V) Output Short-Circuit Duration (to GND)........................1 Minute Input Current into Any Pin, Power On or Off...................50mA Continuous Power Dissipation (TA = +70C) 16-Pin Plastic DIP (derate 22.22mW/C above +70C) ....1778mW 16-Pin Wide SO (derate 20.00mW/C above +70C) .......1600mW 24-Pin Narrow Plastic DIP (derate 20.2mW/C above +70C)..................................1620mW 24-Pin Wide SO (derate 19.3mW/C above +70C) .........1590mW 28-Pin Narrow Plastic DIP (derate 20.2mW/C above +70C)..................................1620mW 28-Pin Wide SO (derate 18.1mW/C above +70C) .........1440mW Operating Temperature Ranges MAX4_ _C_ _.........................................................0C to +70C MAX4_ _E_ _ ......................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
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
PARAMETER Operating Supply Voltage Input Voltage Range Offset Voltage Power-Supply Rejection Ratio On Input Bias Current On Input Resistance Input Capacitance SYMBOL VS VIN VOS PSRR IBIAS RIN CIN
(V+ = 5V, V- = -5V, -2V VIN +2V, RLOAD = 75, unless otherwise noted.) CONDITIONS TA = +25C MIN TYP MAX 4.75 5 -2 3 50 300 Channel off or on MAX463/MAX464, MAX467/MAX468 (Note 1) MAX465/MAX466, MAX469/MAX470, RLOAD = 150, (Note 2) VOUT RLOAD = 150 RLOAD = 75 fIN = 10MHz Output Impedance ROUT MAX463/MAX464, MAX467/MAX468 MAX465/MAX466, MAX469/MAX470 Output Resistance, Disabled Mode Output Capacitance, Disabled Mode ROUTD COUTD MAX463/MAX464 MAX465/MAX466 MAX463-MAX466 MAX463/MAX465/MAX467/MAX469, VIN = 0V MAX464/MAX466/MAX468/MAX470, VIN = 0V MAX463/MAX465, disabled mode MAX464/MAX466, disabled mode 150 0.7 60 1 700 5 0.2 0.3 2.5 2.8 2.0 2.4 5 0.05 0.1 250 1 10 65 85 35 40 80 100 45 50 100 120 50 55 mA 100 0.7 k k pF 0.5 1.0 2.5 -1.5/+2 1.0 % 2.0 V 3 150 5.25 2 10 50 5 TA = TMIN to TMAX MIN MAX 4.75 -2 5.25 2 15 UNITS V V mV dB A k pF
Voltage-Gain Accuracy
Output Voltage Swing
fIN = DC
Positive Supply Current
I+
2
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Two-Channel, Triple/Quad RGB Video Switches and Buffers
ELECTRICAL CHARACTERISTICS (continued)
PARAMETER SYMBOL CONDITIONS MAX463/MAX465/MAX467/MAX469, VIN = 0V Negative Supply Current IMAX464/MAX466/MAX468/MAX470, VIN = 0V MAX463/MAX465, disabled mode MAX464/MAX466, disabled mode Input Noise Density Slew Rate -3dB Bandwidth Differential Gain Error (Note 3) Differential Phase Error (Note 3) Settling Time to 0.1% Adjacent Channel Crosstalk (Note 4) All-Hostile Crosstalk (Note 5) All-Hostile Off Isolation (Note 6) Channel Switching Propagation Delay (Note 7) Channel Switching Time (Note 8) Switching Transient Amplifier Switching Off-Time (Note 9) Amplifier Switching On-Time (Note 10) Logic Input High Threshold Logic Input Low Threshold Logic Input Current High Logic Input Current Low tOFF tON VIH VIL IINHI IINLO en SR BW DG DP tS XTALK XTALK ISO tPD tSW fIN = 10kHz MAX463/MAX464, MAX467/MAX468 MAX465/MAX466, MAX469/MAX470 MAX463/MAX464, MAX467/MAX468 MAX465/MAX466, MAX469/MAX470 MAX463/MAX464, MAX467/MAX468 MAX465/MAX466, MAX469/MAX470 MAX463/MAX464, MAX467/MAX468 MAX465/MAX466, MAX469/MAX470 VIN = 2V-to-0V step fIN = 10MHz fIN = 10MHz fIN = 10MHz, MAX463-MAX466 MAX463-MAX466 MAX463-MAX466 VINA = VINB = 0V, MAX463-MAX466 MAX463-MAX466 MAX463-MAX466 -- - -- - EN, A0, CS, LE; MAX463-MAX466 -- - -- - EN, A0, CS, LE; MAX463-MAX466 -- - -- - EN, A0, CS, LE; MAX463-MAX466 -- - -- - EN, A0, CS, LE; MAX463-MAX466
MAX463-MAX470
(V+ = 5V, V- = -5V, -2V VIN +2V, RLOAD = 75, unless otherwise noted.) TA = +25C MIN TYP MAX 50 65 20 25 20 200 300 100 90 0.01 0.12 0.03 0.14 50 60 50 70 15 20 300 80 100 2 0.8 200 200 0.8 200 200 2 65 80 30 35 TA = TMIN to TMAX UNITS MIN MAX 75 95 35 40 nV/Hz V/s MHz % deg. ns dB dB dB ns ns mVP-P ns ns V V A A
- --
mA
_______________________________________________________________________________________
3
Two-Channel, Triple/Quad RGB Video Switches and Buffers MAX463-MAX470
ELECTRICAL CHARACTERISTICS (continued)
PARAMETER Address Setup Time (Note 11) Address Hold Time (Note 11) -- - CS Pulse Width Low (Note 11) Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: Note 10: Note 11: SYMBOL tSU tH tCS CONDITIONS -- - -- - EN, A0, CS, LE; MAX463-MAX466 -- - -- - EN, A0, CS, LE; MAX463-MAX466 -- - -- - EN, A0, CS, LE; MAX463-MAX466 (V+ = 5V, V- = -5V, -2V VIN +2V, RLOAD = 75, unless otherwise noted.) TA = +25C MIN TYP MAX 30 0 15 15 TA = TMIN to TMAX UNITS MIN MAX 30 0 ns ns ns
Voltage gain accuracy for the unity-gain devices is defined as [(VOUT - VIN) at VIN = 1V - (VOUT - VIN) at VIN = -1V]/2. Voltage gain accuracy for the gain-of-two devices is defined as [(VOUT/2 - VIN) at VIN = 1V - (VOUT/2 - VIN) at VIN = -1V]/2. Tested with a 3.58MHz sine wave of amplitude 40IRE superimposed on a linear ramp (0IRE to 100IRE), RL = 150 to ground. Tested with the selected input connected to ground through a 75 resistor, and a 4VP-P sine wave at 10MHz driving adjacent input. Tested in the same manner as described in Note 4, but with all other inputs driven. -- - Tested with LE = 0V, EN = V+, and all inputs driven with a 4VP-P, 10MHz sine wave. Measured from a channel switch command to measurable activity at the output. Measured from where the output begins to move to the point where it is well defined. Measured from a disable command to amplifier in a non-driving state. Measured from an enable command to the point where the output reaches 90% current out. Guaranteed by design.
__________________________________________Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
MAX464 OUTPUT IMPEDANCE vs. FREQUENCY
MAX463/470 -02 MAX463/470 -01
MAX468 GAIN AND PHASE RESPONSES
2 100
MAX468 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX463/470 -03
60
OUTPUT IMPEDANCE ()
1 GAIN GAIN (dB) 0 PHASE
10 PSRR (dB)
50 V- 40 V+ 30
-1
36 72
PHASE (DEGREES)
0
1
-2
108 144
0.1
20
-3 10k
180 100k 1M FREQUENCY (Hz) 10M 100M
0.01 10k 100k 1M 10M 100M 1G FREQUENCY (Hz)
10 1k 10k 100k 1M 10M 100M FREQUENCY (Hz)
4
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Two-Channel, Triple/Quad RGB Video Switches and Buffers
____________________________Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
MAX463 DISABLED OUTPUT RESISTANCE vs. TEMPERATURE
MAX463/470 -04 MAX463/470 -05
MAX463-MAX470
VOLTAGE GAIN ACCURACY vs. TEMPERATURE
0.16 400
MAX465 DISABLED OUTPUT RESISTANCE vs. TEMPERATURE
MAX463/470 -06
1.30
PERCENTAGE (%)
MAX465 0.12
350
OUTPUT RESISTANCE (k) -50 -25 0 25 50 75 100
0.14
OUTPUT RESISTANCE (k)
1.25
300
1.20
0.10 MAX463 0.08
250
1.15
0.06 -50 -25 0 25 50 75 100 TEMPERATURE (C)
200 TEMPERATURE (C)
1.10 -50 -25 0 25 50 75 100 TEMPERATURE (C)
SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE
MAX463/470 -09
DISABLED SUPPLY CURRENT vs. TEMPERATURE
MAX463/470 -07
OUTPUT VOLTAGE SWING vs. LOAD RESISTANCE
3 OUTPUT VOLTAGE (V) 2 1 0 -1 -2 -3 -4 MAX463/4/7/8:VIN = 4V MAX465/6/9/70:VIN = 2V
MAX463/470 -08
SUPPLY CURRENT PER AMPLIFIER (mA)
30 25 I+ 20 15 I- 10 5 0 -50 -25 0 25 50 75
40 35 SUPPLY CURRENT (mA) I+ 30 25 20 I- 15 10
4
100
-50
-25
0
25
50
75
100
10
100
1000
10000
TEMPERATURE (C)
TEMPERATURE (C)
LOAD RESISTANCE ( )
_______________________________________________________________________________________
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Two-Channel, Triple/Quad RGB Video Switches and Buffers MAX463-MAX470
____________________________Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
MAX464 SMALL-SIGNAL STEP RESPONSE
MAX466 SMALL-SIGNAL STEP RESPONSE
GND
A: VIN, 100mV/div
GND
A: VIN, 100mV/div
GND
B: VOUT, 100mV/div
GND
B: VOUT, 200mV/div
10ns/div
10ns/div
MAX464 LARGE-SIGNAL STEP RESPONSE
MAX466 LARGE-SIGNAL STEP RESPONSE
GND A: VIN, 2V/div GND B: VOUT, 2V/div 20ns/div
GND A: VIN, 1V/div GND B: VOUT, 2V/div 20ns/div
MAX464 OUTPUT TRANSIENT WHEN SWITCHING BETWEEN TWO GROUNDED INPUTS
A: CS, 5V/div GND B: A0, 5V/div C: OUT0, 100mV/div GND
MAX464 EN RESPONSE TIME
A: CS, 5V/div B: EN, 5V/div C: OUT3, 1V/div
GND GND
GND
GND
50ns/div
tOFF
tON
50ns/div
6
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Two-Channel, Triple/Quad RGB Video Switches and Buffers
_____________________________________________________________Pin Descriptions
PIN MAX463/MAX465 1 2, 4, 9, 11, 15, 24 3 5 - 6, 7, 19 8 10 12 - - 13 14, 17 16 18 20 MAX464/MAX466 28 1, 3, 5, 11, 13, 19 2 4 6 7, 9, 21, 23 8 10 12 14 15 17 16, 18 20 22 24 NAME IN0A GND IN1A IN2A IN3A VIN0B IN1B IN2B IN3B OUT3 OUT2 V+ OUT1 OUT0 -- -- CS Channel A, Analog Input 0 Analog Ground Channel A, Analog Input 1 Channel A, Analog Input 2 Channel A, Analog Input 3 Negative Power-Supply Input. Connect to -5V. Thermal path. Channel B, Analog Input 0 Channel B, Analog Input 1 Channel B, Analog Input 2 Channel B, Analog Input 3 Buffered Analog Output 3 Buffered Analog Output 2 Positive Power-Supply Input. Connect to +5V. Buffered Analog Output 1 Buffered Analog Output 0 -- -- -- - Chip-Select--latch control for the digital inputs. When CS is low, A0 and EN -- - input registers are transparent. When CS goes high, the A0 input register latches. -- - -- - If LE is high, the EN input register also latches when CS goes high (see LE). -- - Channel-Select Input. When CS is low, driving A0 low selects channel A and driving A0 high selects channel B. -- - -- - Buffer-Enable Input. When CS is low or LE is low, driving EN low enables -- - all output buffers and driving EN high disables all output buffers. -- - Digital Latch-Enable Input. When LE is low, the EN register is transparent; -- - -- - when LE is high, the EN register is transparent only when CS is low. Hardwire to V+ or GND for best crosstalk performance. FUNCTION
MAX463-MAX470
21 22
25 26
A0 -- -- EN
23
27
LE
PIN MAX467/MAX469 1 2, 7, 8, 9, 15 3 4, 5, 12, 13 6 - - 10 11 14 16 MAX468/MAX470 1 2, 7, 15 3 4, 5, 12, 13 6 8 9 10 11 14 16
NAME IN0 GND IN1 VIN2 IN3 OUT3 V+ OUT2 OUT1 OUT0 Analog Input 0 Analog Ground Analog Input 1
FUNCTION
Negative Power-Supply Input. Connect to -5V. Thermal path. Analog Input 2 Analog Input 3 Buffered Analog Output 3 Positive Power-Supply Input. Connect to +5V. Buffered Analog Output 2 Buffered Analog Output 1 Buffered Analog Output 0 7
_______________________________________________________________________________________
Two-Channel, Triple/Quad RGB Video Switches and Buffers MAX463-MAX470
_______________Detailed Description
The MAX463-MAX470 have a bipolar construction, which results in a typical channel input capacitance of only 5pF, whether the channel is on or off. This low input capacitance allows the amplifiers to realize full AC performance, even with source impedances as great as 250. It also minimizes switching transients because the driving source sees the same load whether the channel is on or off. Low input capacitance is critical, because it forms a single-pole RC lowpass filter with the output impedance of the signal source, and this filter can limit the system's signal bandwidth if the RC product becomes too large. The MAX465/MAX466/MAX469/MAX470's amplifiers are internally configured for a gain of two, resulting in an overall gain of one at the cable output when driving back-terminated coaxial cable (see the section Driving Coaxial Cable). The MAX463/MAX464/MAX467/MAX468 are internally configured for unity gain.
COAX RT RETURN CURRENT GROUND PLANE
COAX RT RETURN CURRENT
Figure 1. Low-Crosstalk Layout. Return current from the termination resistor does not flow through the ground plane.
Power-Supply Bypassing and Board Layout
To realize the full AC performance of high-speed amplifiers, pay careful attention to power-supply bypassing and board layout, and use a large, low-impedance ground plane. With multi-layer boards, the ground plane should be located on the layer that is not dedicated to a specific signal trace. To prevent unwanted signal coupling, minimize the trace area at the circuit's critical high-impedance nodes, and surround the analog inputs with an AC ground trace (analog ground, bypassed DC power supply, etc). The analog input pins to the MAX463-MAX470 have been separated with AC ground pins (GND, V+, V-, or a hard-wired logic input) to minimize parasitic coupling, which can degrade crosstalk and/or stability of the amplifier. Keep signal paths as short as possible to minimize inductance, and ensure that all input channel traces are of equal length to maintain the phase relationship between the R, G, and B signals. Connect the coaxial-cable shield to the ground side of the 75 terminating resistor at the ground plane to further reduce crosstalk (see Figure 1). Bypass all power-supply pins directly to the ground plane with 0.1F ceramic capacitors, placed as close to the supply pins as possible. For high-current loads, it may be necessary to include 10F tantalum or aluminum-electrolytic capacitors in parallel with the 0.1F ceramics. Keep capacitor lead lengths as short as possible to minimize series inductance; surface-mount (chip) capacitors are ideal.
Connect all V- pins to a large power plane. The V- pins conduct heat away from the internal die, aiding thermal dissipation.
Differential Gain and Phase Errors
Differential gain and phase errors are critical specifications for an amplifier/buffer in color video applications, because these errors correspond directly to changes in the color of the displayed picture in composite video systems. The MAX467-MAX470 have low differential gain and phase errors, making them ideal in broadcastquality composite color applications, as well as in RGB video systems where these errors are less significant. The MAX467-MAX470 differential gain and phase errors are measured with the Tektronix VM700 Video Measurement Set, with the input test signal provided by the Tektronix 1910 Digital Generator as shown in Figure 2. Measuring the differential gain and phase of the MAX469/MAX470 (Figure 2a) is straightforward because the output amplifiers are configured for a gain of two, allowing connection to the VM700 through a back-terminated coaxial cable. Since the MAX467/MAX468 are unity-gain devices, driving a back-terminated coax would result in a gain of 1/2 at the VM700. Figure 2b shows a test method to measure the differential gain and phase for the MAX467/MAX468. First, measure and store the video signal with the device under test (DUT) removed and replaced with a short circuit, and the 150 load resistor omitted. Then do another measurement with the DUT and load resistor in the circuit, and calculate the differential gain and phase errors by subtracting the results.
8
_______________________________________________________________________________________
Two-Channel, Triple/Quad RGB Video Switches and Buffers MAX463-MAX470
(a)
75 CABLE
75 75 CABLE DUT SOURCE: TEKTRONIX 1910 DIGITAL GENERATOR 75 75 MEASUREMENT: TEKTRONIX VM700 VIDEO MEASUREMENT SET 75 DUT 150 AV = 2 75 75 CABLE
MAX469/MAX470
75
75 CABLE
(b)
75 75 CABLE
MAX467/MAX468
Figure 2. Differential Phase and Gain Error Test Circuits (a) for the MAX469/MAX470 Gain-of-Two Amplifiers, (b) for the MAX467/MAX468 Unity-Gain Amplifiers
Driving Coaxial Cable
High-speed performance, excellent output current capability, and an internally fixed gain of two make the MAX465/MAX466/MAX469/MAX470 ideal for driving 50 or 75 back-terminated coaxial cables. The MAX465/MAX466/MAX469/MAX470 will drive a 150 load (75 back-terminated cable) to 2.5V. The Typical Operating Circuit shows the MAX465/MAX466 driving four back-terminated 75 video cables. The back-termination resistor (at each amplifier output) provides impedance matching at the driven end of the cable to eliminate signal reflections. It forms a voltage divider with the load impedance, which attenuates the signal at the cable output by one-half. The amplifier operates with an internal 2V/V closed-loop gain to provide unity gain at the cable's output.
The MAX463-MAX470 phase margin and capacitiveload driving performance are optimized by internal compensation. When driving capacitive loads greater than 50pF, connect an isolation resistor between the amplifier output and the capacitive load, as shown in Figure 3.
AV = 1 12 IN_ OUT_ 100pF
Driving Capacitive Loads
Driving large capacitive loads increases the likelihood of oscillation in most amplifier circuits. This is especially true for circuits with high loop-gains, like voltage followers. The amplifier's output impedance and the capacitive load form an RC filter that adds a pole to the loop response. If the pole frequency is low enough, as when driving a large capacitive load, the circuit phase margin is degraded and oscillation may occur.
MAX468
Figure 3a. Using an Isolation Resistor with a Capacitive Load
9
_______________________________________________________________________________________
Two-Channel, Triple/Quad RGB Video Switches and Buffers MAX463-MAX470
MAX468 (NO ISOLATION RESISTOR) MAX468 (WITH ISOLATION RESISTOR)
A GND GND
A
GND
B
GND
B
CLOAD = 100pF A: VIN, 500mV/div B: VOUT, 500mV/div
1s/div
1s/div CLOAD = 100pF, RISOLATION = 12 A: VIN, 500mV/div B: VOUT, 500mV/div
Figure 3b. Step Response without an Isolation Resistor
Figure 3c. Step Response with an Isolation Resistor
Digital Interface
The MAX463-MAX466 multiplexer architecture provides an input transistor buffer, ensuring that no input channels are ever connected together. Select a channel by changing A0's state (A0 = 0-- channel A, and A0 = 1 for - for channel B) and pulsing CS low (see Tables 1a, 1b). Figure 4 shows the logic timing diagram.
Output Disable (MAX463-MAX466) -- - When the enable input (EN) is driven to a TTL low state, - it -- enables the MAX463-MAX466 amplifier outputs. When EN is driven high, it disables the amplifier outputs. The
disabled MAX463/MAX464 outputs exhibit a 250k typical resistance. Because their internal feedback resistors are required to produce a gain of two, the MAX465/MAX466 exhibit a 1k disabled output resistance. -- - -- - LE determines whether EN is latched by CS or operates independently. -- When the latch-enable input (LE) is con- -- - nected to V+, CS - becomes the latch - -- --control for the EN input register. If CS is low, both the EN and A0 registers -- - are transparent; once CS returns high, both registers are latched.
CS
tCS
tSU
A0
tH
tSU
EN
tH
tOFF
OUTPUTS HIGH-Z
tON
LE = V+
tPD
tSW
Figure 4. Logic Timing Diagram
10 ______________________________________________________________________________________
Two-Channel, Triple/Quad RGB Video Switches and Buffers MAX463-MAX470
Table 1a. Amplifier and Channel Selection with LE = V+
-- - CS 0 0 0 1 -- - EN 0 0 1 X A0 0 1 X X FUNCTION Enables amplifier outputs. Selects channel A. Enables amplifier outputs. Selects channel B. Disables amplifiers. Outputs high-Z. Latches all input registers. Changes nothing.
Table 1b. Amplifier and Channel Selection with LE = GND
-- - CS 0 0 0 0 -- - EN 0 0 1 1 A0 0 1 0 1 FUNCTION Enables amplifier outputs. Selects channel A. Enables amplifier outputs. Selects channel B. Disables amplifiers. Outputs high-Z. A0 register = channel A Disables amplifiers. Outputs high-Z. A0 register = channel B Enables amplifier outputs, latches A0 register, programs outputs to output A or B, according to the setting of A0 at -- - CS's last edge. Disables amplifiers. Outputs high-Z.
1
0
X
1
1
X
-- - When LE is connected to ground, the EN register is -- - transparent and independent of CS activity. This allows all MAX463-MAX466 devices to be simultaneously shut -- - down, regardless of the CS input state. Simply connect -- - LE to ground and connect all EN inputs together (Figure 5a). For the MAX464 and MAX466, LE must be hardwired to either V+ or ground (rather than driving LE with a gate) to prevent crosstalk from the digital inputs to IN0A.
Another option for output disable is to connect LE to V+, parallel the outputs of several MAX463-MAX466s, and use -- - EN to individually disable all devices but the one in use (Figure 5b). When the outputs are disabled, the off isolation from the analog inputs to the amplifier outputs is typically 70dB at 10MHz, all inputs driven with a 4V P-P sine wave and a 150 load impedance. Figure 6 shows the test circuits used to measure isolation and crosstalk.
EN
MAX463- LE MAX466
+5V SHUTDOWN EN
AO CS LE
MAX463- MAX466
EN
MAX463- LE MAX466
+5V EN NOTE: ISOLATION RESISTORS, IF REQUIRED, NOT SHOWN.
AO CS
MAX463- MAX466
LE
(a)
(b)
-- -- -- -- Figure 5. (a) Simultaneous Shutdown of all MAX463-MAX466, (b) Enable (EN) Register Latched by CS
______________________________________________________________________________________ 11
Two-Channel, Triple/Quad RGB Video Switches and Buffers MAX463-MAX470
MAX467-MAX470 MAX467-MAX470
75
150
75
150
VIN = 4VP-P AT 10MHz, RS = 75
*
VIN = 4VP-P AT 10MHz, RS = 75
*
(a)
MAX463-MAX466
(b)
MAX463-MAX466
75 150 150
150
150
150
150
*
150 LE EN +5V VIN = 4VP-P AT 10MHz, RS = 75 VIN = 4VP-P AT 10MHz, RS = 75 * MAX464/MAX466/MAX468/MAX470 ONLY
*
150
(c)
(d)
Figure 6. (a) MAX467-MAX470 Adjacent Channel Crosstalk, (b) MAX467-MAX470 All-Hostile Crosstalk, (c) MAX463-MAX466 All-Hostile Off Isolation, (d) MAX463-MAX466 All-Hostile Crosstalk
12 ______________________________________________________________________________________
Two-Channel, Triple/Quad RGB Video Switches and Buffers MAX463-MAX470
75 1 2 75 3 4 75 5 6 75 -5V 75 -5V 75 7 8 9 10 11 12 75 13 14 75 GND IN1A GND IN2A GND IN3A V- V- IN0B 4P2T VIDEO SWITCH OUT1 GND V+ OUT2 21 LE EN IN0A 28 27 26 25 24 23 22 75 -5V 2 GND IN1 GND OUT1 15 -5V 1 IN0 OUT0 16 75 75 +5V
MAX464
A0 CS V- OUT0
MAX470
20 19 18 17 75 16 75 -5V +5V -5V
3 4 5 6 7
14 13 12 11 75 10 75 75 -5V -5V 75
V- IN1B GND IN2B GND IN3B
V- V- IN2
V- V- OUT2
V+ OUT3
+5V
GND IN3
V+ OUT3
V+
15 75
8
9 75 75
75 1 2 75 3 4 75 5 6 75 -5V 75 -5V 75 7 8 9 10 11 12 75 13 14 75 GND IN1A GND IN2A GND IN3A
IN0A LE EN
28 27 26 25 24 23 22 75 -5V +5V
MAX464
A0 CS V- OUT0
V- V- IN0B 4P2T VIDEO SWITCH OUT1 GND V+ OUT2
21
-5V
20 19 18 17 75 16 75
V- IN1B GND IN2B GND IN3B
+5V
V+ OUT3
+5V
15 75 FROM OTHER MAX464s
Figure 7. Higher-Order RGB + Sync Video Multiplexer
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Two-Channel, Triple/Quad RGB Video Switches and Buffers MAX463-MAX470
A1 75 1 2 75 3 4 75 5 6 75 -5V 75 -5V 75 7 8 9 10 11 12 75 13 14 75 GND IN1A GND IN2A GND IN3A QUAD SPDT VIDEO SWITCH V- OUT1 GND V+ OUT2 V- IN0B 21 LE EN IN0A 28 27 26 25 24 23 22 22 -5V 50 75 -5V +5V A0 CS
MAX466
A0 CS V- OUT0
20 19 18 17 22 50 16 75 22 50 75
V- IN1B GND IN2B GND IN3B
+5V
V+ OUT3
+5V
15 22 50 75
75 1 2 75 3 4 75 5 6 75 -5V 75 -5V 75 7 8 9 10 11 12 75 13 14 75 GND IN1A GND IN2A GND IN3A QUAD SPDT VIDEO SWITCH
IN0A LE EN
28 27 26 25 24 23 22 22 -5V +5V
MAX466
A0 CS V- OUT0
V- OUT1 GND V+ OUT2
21
-5V
V- IN0B
20 19 18 17 22 16 22
V- IN1B GND IN2B GND IN3B
+5V
V+ OUT3
+5V
15 22
Figure 8. 1-of-4 RGB + Sync Video Multiplexer
14 ______________________________________________________________________________________
Two-Channel, Triple/Quad RGB Video Switches and Buffers
__________Applications Information
Higher-Order RGB + Sync Video Multiplexing
Higher-order RGB video multiplexers can be realized by paralleling several MAX463/MAX464s. Connect LE -- - -- - to V+ and use CS and EN to disable all devices but the one in use. Since the disabled output resistance of the MAX463/MAX464 is 250k, several devices may be paralleled to form larger RGB video multiplexer arrays without signal degradation. Connect series resistors at each amplifier's output to isolate the disabled output capacitance of each paralleled device, and use a MAX469 or MAX470 to drive the output coaxial cables (see Figure 7).
Paralleling MAX466s to Switch 1-of-4 RGB + Sync Signal Inputs
Figure 8 shows a 1-of-4 RGB + sync video mux/amp circuit. The 1k disabled output resistance limits the number of paralleled MAX465/MAX466s to no more than two. The amplifier outputs are connected after a 22 isolation resistor and ahead of a 50 back-termination resistor, which isolates the active amplifier output from the capacitive load (5pF typ) presented by the inactive output of the second MAX466. Impedance mismatching is minimal, and the signal gain at the cable end is near 1. This minimizes ringing in the output signals. For multiplexing more than two devices, see the section Higher Order RGB + Sync Video Multiplexing, above.
MAX463-MAX470
_____________________________________________Pin Configurations (continued)
TOP VIEW
GND IN1A GND IN2A GND IN3A VIN0B V-
1 2 3 4 5 6 7 8 9 SWITCH
28 IN0A
IN0 GND IN1 VVIN2 GND GND
1 2 3 4 5 6 7 8
16 OUT0 15 GND 14 OUT1 13 V12 V11 OUT2 10 V+ 9 GND
IN0 GND IN1 VVIN2 GND IN3
1 2 3 4 5 6 7 8
16 OUT0 15 GND 14 OUT1 13 V12 V11 OUT2 10 V+ 9 OUT3
MAX464 MAX466
27 LE 26 EN 25 A0 24 CS 23 V22 OUT0 21 V20 OUT1 19 GND 18 V+ 17 OUT2 16 V+ 15 OUT3
4P2T
IN1B 10 GND 11 IN2B 12 GND 13 IN3B 14
DIP/SO
DIP/SO
MAX467 MAX469 TRIPLE (RGB) BUFFERS
MAX468 MAX470 QUAD BUFFERS
DIP/SO
______________________________________________________________________________________
15
Two-Channel, Triple/Quad RGB Video Switches and Buffers MAX463-MAX470
__________Typical Operating Circuit _Ordering Information (continued)
PART
+5V 10F 0.1F
TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C
PIN-PACKAGE 28 Narrow Plastic DIP 28 Wide SO Dice* 28 Narrow Plastic DIP 28 Wide SO 24 Narrow Plastic DIP 24 Wide SO Dice* 24 Narrow Plastic DIP 24 Wide SO 28 Narrow Plastic DIP 28 Wide SO Dice* 28 Narrow Plastic DIP 28 Wide SO 16 Plastic DIP 16 Wide SO Dice* 16 Plastic DIP 16 Wide SO 16 Plastic DIP 16 Wide SO Dice* 16 Plastic DIP 16 Wide SO 16 Plastic DIP 16 Wide SO Dice* 16 Plastic DIP 16 Wide SO 16 Plastic DIP 16 Wide SO Dice* 16 Plastic DIP 16 Wide SO
MAX464CNI
MAX465 MAX466
AV = 2 OUT0 75 75 AV = 2 OUT1 75 75 AV = 2 OUT2 75 75 AV = 2 OUT3 75 75
IN0A IN0B IN1A IN1B IN2A IN2B IN3A IN3B A0 -5V 10F LOGIC
MAX464CWI MAX464C/D MAX464ENI MAX464EWI MAX465CNG MAX465CWG MAX465C/D MAX465ENG MAX465EWG MAX466CNI MAX466CWI MAX466C/D MAX466ENI MAX466EWI MAX467CPE MAX467CWE MAX467C/D MAX467EPE MAX467EWE MAX468CPE MAX468CWE MAX468C/D MAX468EPE MAX468EWE MAX469CPE MAX469CWE MAX469C/D MAX469EPE MAX469EWE MAX470CPE MAX470CWE MAX470C/D MAX470EPE MAX470EWE
0.1F
MAX466 ONLY
* Dice are specified at TA = +25C, DC parameters only.
16
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