Triple 2:1 300 MHz Mux-Amp AV =2
Features
General Description
•
•
•
•
•
The EL4332C is a triple very high speed 2:1 Multiplexer-Amplifier. It
is intended primarily for component video multiplexing and is especially suited for pixel switching. The amplifiers have their gain set to 2
internally, which reduces the need for many external components. The
gain-of-2 facilitates driving back terminated cables. All three amplifiers are switched simultaneously from their A to B inputs by the
TTL/CMOS compatible, common A/B control pin.
3 ns A-B switching
300 MHz bandwidth
Fixed gain of 2, for cable driving
> 650V/µs slew rate
TTL/CMOS compatible switch
Applications
•
•
•
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EL4332C
EL4332C
A -3 dB bandwidth of 300 MHz together with 3 ns multiplexing time
enable the full performance of the fastest component video systems to
be realized.
RGB multiplexing
Picture-in-picture
Cable driving
HDTV processing
Switched gain amplifiers
ADC input multiplexer
The EL4332C runs from standard ±5V supplies, and is available in the
narrow 16-pin small outline package.
Ordering Information
Part No.
Temp. Range
Package
Outline #
EL4332CS
-40°C to 85°C
SO16
MDP0027
Connection Diagrams
Demo Board
A demo PCB is available for this product. Request “EL4332/1 Demo Board.”
November 12, 1999
© 1995 Elantec, Inc.
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Absolute Maximum Ratings (T
A
VCC to VEE
VCC to any GND
VEE to any GND
Continuous Output Current
Any Input
= 25 °C)
Input Current, Any Input
Power Dissipation
Operating Temperature
Junction Temperature
Storage Temperature
14V
12V
12V
45 mA
VEE - 0.3V to VCC + 0.3V
5 mA
See Curves
-40°C to 85°C
170°C
-60°C to +150°C
Important Note:
All parameters having Min/Max specifications are guaranteed. The Test Level column indicates the specific device testing actually performed during
production and Quality inspection. Elantec performs most electrical tests using modern high-speed automatic test equipment, specifically the LTX77
Series system. Unless otherwise noted, all tests are pulsed tests, therefor TJ = TC = TA.
Test Level
Test Procedure
I
100% production tested and QA sample tested per QA test plan QCX0002.
II
100% production tested at TA = 25°C and QA sample tested at TA = 25°C, TMAX and TMIN per QA test plan QCX0002.
III
QA sample tested per QA test plan QCX0002.
IV
Parameter is guaranteed (but not tested) by Design and Characterization Data.
V
Parameter is typical value at TA = 25°C for information purposes only.
DC Electrical Characteristics
VCC = +5V, VEE = -5V, Temperature = 25°C, RL = ×
Typ
Max
Test Level
Units
VOS
Input Referred Offset Voltage
8
20
II
mV
dVOS
Input Referred Offset Voltage Delta [1]
2
8
II
mV
RIN
Input Resistance
30
V
kΩ
IB
Input Bias Current
-7
-30
II
µA
dIB
Input Bias Current Delta [1]
0.5
4.0
II
µA
AV
Gain
2.00
2.06
II
V/V
dAV
Gain Delta [1]
0.5
2.5
II
%
CIN
Input Capacitance
3.3
V
pF
50
70
II
dB
±2.7
±3.6
II
V
+3/-2.7
V
V
40
II
mA
Parameter
Description
PSRR
Power Supply Rejection Ratio
VO
Output Voltage Swing into 500Ω load
Min
1.94
Output Voltage Swing into 150Ω load
[2]
IOUT
Current Output, Measured with 75W Load
XtalkAB
Crosstalk from Non-selected Input (at DC)
-70
-100
III
dB
XtalkCH-CH
Crosstalk from one Amplifier to another Amplifier
-70
-100
V
dB
VIH
Input Logic High Level
2.0
II
V
VIL
Input Logic Low Level
IIL
Logic Low Input Current (VIN = 0V)
IIH
Logic High Input Current (VIN = 0V)
-3
IS
Total Supply Current
38
30
-0.3
1. Each channel’s A-input to its B-input.
2. There is no short circuit protection on any output.
2
0.8
II
V
-80
II
µA
0
3
II
µA
48
60
II
mA
-40
AC Electrical Characteristics
VCC = +5V, VEE = -5V, Temperature = 25°C, RL = 150Ω, CL = 3 pF.
Test Level
Units
BW
-3 dB Bandwidth
300
V
MHz
BW 0.1dB
±0.1 dB Bandwidth
105
V
MHz
DG
Differential Gain at 3.58 MHz
0.04
V
%
DP
Differential Phase at 3.58 MHz
0.08
V
°
Pkg
Peaking with Nominal Load
0.2
V
dB
SR
Slew Rate (4V Square Wave, Measured 25%–75%)
650
V
V/µs
ts
Settling Time to 0.1% of Final Value
13
V
ns
TSW
Time to Switch Inputs
3
V
ns
OS
Overshoot, VOUT = 4 VP-P
8
V
%
Input to Input Isolation at 10 MHz
60
V
dB
Parameter
Description
Min
Typ
Max
ISOab
10M
100M
Input to Input Isolation at 100 MHz
40
V
dB
ISOch-ch
10M
Channel to Channel Isolation at 10 MHz
61
V
dB
100M
Channel to Channel Isolation at 100 MHz
50
V
dB
Pin Descriptions
Pin Name
A1, A2, A3
Function
“A” inputs to amplifiers 1, 2 and 3 respectively
B1, B2, B3
“B” inputs to amplifiers 1, 2 and 3 respectively
GND1, GND2, GND3
These are the individual ground pins for each channel.
Out1, Out2, Out3
Amplifier outputs. Note: there is no short circuit protection on any output.
VCC
Positive power supply. Typically +5V.
VEE
Negative power supply. Typically -5V.
A/B
Common input select pin, a logic high selects the “A” inputs, logic low selects the “B” inputs. CMOS/TTL compatible.
3
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Burn In Schematic
4
Typical Performance Curves
Small Signal Transient Response
Large Signal Transient Response
Switching to Ground from a Large
Signal Uncorrelated Sine Wave
Switching from Ground to a Large
Signal Uncorrelated Sine Wave
Switching to Ground from a Small
Signal Uncorrelated Sine Wave
Switching from Ground to a Small
Signal Uncorrelated Sine Wave
5
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Switching Glitch
(Inputs at Ground)
Switching from a Family of DC
Levels to Ground
Switching from Ground to a
Family of DC Levels
Channel A/B Switching Delay
Gain vs Frequency
Gain vs Frequency
6
-3 dB BW vs Supply Voltage
Bandwidth vs Die Temperature
Frequency Response with Capacitive
Loads
Input Voltage Noise over Frequency
A-Input to B–Input Isolation
Channel-Channel Isolation
7
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
Output Swing vs Supply Voltage
Slew Rate vs Supply Voltage
Slew Rate vs Die Temperature
Supply Current vs Supply Voltage
Maximum Power Dissipation
A-Input to B–Input Isolation
8
supply decoupling capacitors and the back terminating
resistors, if transmission lines are to be driven. The
EL4332 can drive backmatched 50Ω or 75Ω loads.
Applications
Figure 1 shows a typical use for the EL4332C. The circ ui t i s a c o m p o n e n t v i d e o ( R , G , B o r Y , U , V )
multiplexer. Since the gain of the internal amplifiers has
been set to 2, the only extra components needed are the
Figure 1. Typical Connection for a 2:1 Component Video Multiplexer
9
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
current, typically < 30 µA, for a logic “low”. If left to
float, it will be a logic “high”.
Grounds
It will be noticed that each mux-amp channel has its own
separate ground pin. These ground pins have been kept
separate to keep the channel separation inside the chip as
large as possible. The feedback resistors use these
ground pins as their reference. The resistors total 400Ω,
so there is a significant signal current flowing from these
pins to ground.
The ground pins should all be connected together, to a
ground plane underneath the chip. 1 oz. copper for the
ground plane is highly recommended.
Further notes and recommended practices for high speed
printed circuit board layout can be found in the tutorials
in the Elantec databooks.
Supplies
Figure 2. Simplified Logic Input Stage
Supply bypassing should be as physically near the power
pins as possible. Chip capacitors should be used to minimize lead inductance. Note that larger values of
capacitor tend to have larger internal inductances. So
when designing for 3 transmission lines or similar moderate loads, a 0.1 µF ceramic capacitor right next to the
power pin in parallel with a 22 µF tantalum capacitor
placed as close to the 0.1 µF is recommended. For lighter
loadings, or if not all the channels are being used, a single 4.7 µF capacitor has been found quite adequate.
The input PNP transistors have sufficient gain that a
simple level shift circuit (see Figure 3) can be used to
provide a simple interface with Emitter Coupled Logic.
Typically, 200 mV is enough to switch from a solid
logic “low” to a “high.”
Note that component video signals do tend to have a
high level of signal correlation. This is especially true if
the video signal has been derived from 3 synchronously
clocked DACs. This corresponds to all three channels
drawing large slew currents simultaneously from the
supplies. Thus, proper bypassing is critical.
Logic Inputs
Figure 3. Adapting the Select Pin
for ECL Logic Levels
The A/B select, logic input, is internally referenced to
ground. It is set at 2 diode drops above ground, to give a
threshold of about 1.4V (see Figure 2). The PNP input
transistor requires that the driving gate be able to sink
The capacitor Cff is only in the network to prevent the
A/B pin’s capacitance from slowing the control signal.
The network shown level shifts the ECL levels, -0.7V to
-1.5V to +1.6V and +1.1V respectively. The terminating
resistor, Rtt, is required since the open emitter of the
ECL gate can not sink current. If a -2V rail is not being
10
When interstage attenuators are used, the values should
be kept down in the region of 50Ω–300Ω. This is to prevent a combination of circuit board stray capacitance
and the EL4332C’s input capacitance forming a significant pole. For example, if instead of 100Ω as shown,
resistors of 1 kΩ had been used, and assuming 3 pF of
stray and 3 pF of input capacitance, a pole would be
formed at about 53 MHz.
used, a 220Ω to 330Ω resistor to the -5.2V rail would
have the same effect.
Expanding the Multiplexer
In Figure 4, a 3:1 multiplexer circuit is shown. The
expansion to more inputs is very straight forward. Since
the EL4332C has a fixed gain of 2, interstage attenuators
may be required as shown in Figure 3. The truth table for
the 3:1 multiplexer select lines is:
X
Y
Mux Output
0
0
R3, G3, B3
0
1
R2, G2, B2
1
X
R1, G1, B1
Figure 4. Typical Connection for a 3:1 Component Video Multiplexer
11
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
give a Butterworth LPF response, with a -3 dB frequency of 50 MHz. Note again, the resistor values are
low, so that stray capacitance does not affect the desired
cut-off frequency.
A Bandwidth Selectable Circuit
In Figure 5, a circuit is shown that allows three signals
to be either low pass filtered or full bandwidth.
This could be useful where an input signal is frequently
noisy. The component values shown
Figure 5. Switched 50 MHz Low Pass Filter for High/Low Resolution Monitors
12
EL4332 Macromodel
* EL4332 Macromodel
* Revision A, April 1996
****************************************************************************
*Applications Hints. The EL4332 has two VCC pins, one VEE pin, and three ground
*pins. The VCC pins (pins 14 and 15 are internally shorted together in the model,
*but the ground pins (GND1, GND2, and GND3 (nodes 2, 7, and 10, respectively)
*must be connected to ground (node 0) using a le-6W resistor. Alternatively,
* nodes 2, 7, and 10 may be connected to ground through a 25Ω resistor in parallel
* with a 4 nH inductor to simulate package and PCB parasitics.
****************************************************************************
* Connections:
* OUT1
* |
GND1
* |
|
A1
* |
|
|
B1
* |
|
|
|
B2
* |
|
|
|
|
A2
* |
|
|
|
|
|
GND2
* |
|
|
|
|
|
|
OUT2
* |
|
|
|
|
|
|
|
* |
|
|
|
|
|
|
|
* 1
2
3
4
5
6
7
8
*
* OUT3
* |
GND3
* |
|
B3
* |
|
|
A3
* |
|
|
|
VEE
* |
|
|
|
|
VCC
* |
|
|
|
|
|
VCC
* |
|
|
|
|
|
|
A/B
* |
|
|
|
|
|
|
|
* |
|
|
|
|
|
|
|
* 9
10
11
12
13
14
15
16
************A B Switch ***************
Rshort 14 15 le-12
rshort1 15 0 100 Meg
Isw 14 110 1.5 mA
vref 111 0 1.6V
q1 101 16 110 qp
q2 102 111 110 qp
R1 101 13 500
R2 102 13 500
Rd1 107 0 100
Esw 107 0 table {v(102, 101)*100} (0,0) (1,1)
*
************Amplifier #1 *************
q131 103 3 112 qp
q141 104 114 113 qp
q151 105 4 115 qp
q161 106 117 116 qp
Ia11 14 112 1 mA
Ia21 14 113 1 mA
Ib11 14 115 1 mA
Ib21 14 116 1 mA
Rga1 112 113 275
Rgb1 115 116 275
R31 103 13 275
R41 104 13 275
R51 105 13 275
R61 106 13 275
R71 1 114 400
13
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
R81 114 2 400
R911 117 400
R110 117 2 400
Ediff1 108 0 value {(v(104,103)*v(107))+(v(106,105)*(1-v(107)))}
rdiff1 108 0 1K
*
*Compensation Section
*
ga1 0 134 108 0 1m
rh1 134 0 5 Meg
cc1 134 0 0.6 pF
*
*Poles
*
ep1 141 0 134 0 1.0
rpa1 141 142 200
cpa1 142 0 0.75 pF
rpb1 142 143 200
cpb1 143 0 0.75 pF
*
*Output Stage
*
i011 15 150 1.0 mA
i021 151 13 1.0 mA
q71 13 143 150 qp
q81 15 143 151 qn
q91 15 150 152 qn
q101 13 151 153 qp
ros11 152 1 2
ros21 153 1 2
*
************Amplifier #2***********
q231 203 6 212 qp
q241 204 214 213 qp
q251 205 5 215 qp
q261 206 217 216 qp
Ia12 14 212 1 mA
Ia22 14 213 1 mA
Ib12 14 215 1 mA
Ib22 14 216 1 mA
Rga2 212 213 275
Rgb2 215 216 275
R231 203 13 275
R241 204 13 275
R251 205 13 275
R261 206 13 275
R271 8 214 400
R281 214 7 400
R291 8 217 400
R210 217 7 400
Ediff2 208 0 value {(v(204,203)*v(107))+(v(206,205)*(1-v(107)))}
rdiff2 208 0 1K
*
* Compensation Section
*
ga2 0 234 208 0 1m
rh2 234 0 5 Meg
cc2 234 0 0.6 pF
*
* Poles
*
ep2 241 0 234 0 1.0
rpa2 241 242 200
cpa2 242 0 0.75 pF
14
rpb2 242 243 200
cpb2 243 0 0.75 pF
*
*Output Stage
*
i0 12 15 250 1.0 mA
i022 251 13 1.0 mA
q271 13 243 250 qp
q281 15 243 251 qn
q291 15 250 252 qn
q201 13 251 253 qp
ros12 252 8 2
ros22 253 8 2
*
************Amplifier #3 ************
q331 303 12 312 qp
q341 304 314 313 qp
q351 305 11 315 qp
q361 306 317 316 qp
Ia13 14 312 1 mA
Ia23 14 313 1 mA
Ib13 14 315 1 mA
Ib23 14 316 1 mA
Rga3 312 313 275
Rgb3 315 316 275
R331 303 13 275
R341 304 13 275
R351 305 13 275
R361 306 13 275
R371 9 314 400
R381 314 10 400
R391 9 317 400
R310 317 10 400
Ediff3 308 0 value {( v(304,303)*(v(107))+(v(306,305)*(1-v(107)))}
rdiff3 308 0 1K
*
* Compensation
*
ga3 0 334 308 01m
rh3 334 0 5 Meg
cc3 334 0 0.6 pF
*
* Poles
*
ep3 341 0 3340 1.0
rpa3 341 342 200
cpa3 342 0 0.75 pF
rpb3 342 343 200
cpb3 343 0 0.75 pF
*
* Output Stage
*
i013 15 350 1.0 mA
i023 351 13 1.0 mA
q371 13 343 350 qp
q381 15 343 351 qn
q391 15 350 352 qn
q301 13 351 353 qp
ros13 352 9 2
ros23 353 9 2
*
* Power Supply Current
*
ips 15 13 22 mA
15
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
*
*Models
*
.model qp pnp(is=1.5e-16 bf=300 tf=0.01 ns)
.model qn npn(is=0.8e-18 bf=300 tf=0.01 ns)
.ends
16
EL4332C
EL4332C
Triple 2:1 300 MHz Mux-Amp AV =2
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described
herein and makes no representations that they are free from patent infringement.
November 12, 1999
WARNING - Life Support Policy
Elantec, Inc. products are not authorized for and should not be used
within Life Support Systems without the specific written consent of
Elantec, Inc. Life Support systems are equipment intended to support or sustain life and whose failure to perform when properly used
in accordance with instructions provided can be reasonably
expected to result in significant personal injury or death. Users contemplating application of Elantec, Inc. Products in Life Support
Systems are requested to contact Elantec, Inc. factory headquarters
to establish suitable terms & conditions for these applications. Elantec, Inc.’s warranty is limited to replacement of defective
components and does not cover injury to persons or property or
other consequential damages.
Elantec, Inc.
1996 Tarob Court
Milpitas, CA 95035
Telephone: (408) 945-1323
(800) 333-6314
Fax:
(408) 945-9305
European Office: 44-71-482-4596
17
Printed in U.S.A.