19-1143; Rev 0; 10/96
KIT
ATION
EVALU
LE
B
AVAILA
Quad/Triple, SPDT, RGB Switches
with 250MHz Video Buffer Amplifiers
____________________________Features
o
High Speed:
250MHz Small-Signal -3dB Bandwidth
135MHz Full-Power -3dB Bandwidth
o
70MHz 0.1dB Gain Flatness
o
1250V/µs Slew Rate
o
12ns to 0.1% Settling Time
o
0.03°/0.06% Differential Phase/Gain Error
o
2pF Input Capacitance
o
3ns Channel-Switching Time
o
120mVp-p Channel-Switching Transient
o
Three-State Output Allows Large Switch Arrays
o
Directly Drives 50Ω or 75Ω Back-Terminated
Cables
_______________General Description
The MAX498/MAX499 are high-speed, quad/triple, sin-
gle-pole/double-throw video switches with on-board
closed-loop buffer amplifiers. The buffer amplifiers fea-
ture +6dB gain (A
VCL
= 2V/V), 250MHz -3dB band-
width, 70MHz 0.1dB gain flatness, and 1250V/µs slew
rate. Fast switching time (3ns) and fast settling time
(12ns for a 4V step) make these devices excellent
choices for a wide variety of video applications. The low
differential gain/phase errors (0.03%/0.06°) and wide
bandwidth make them ideal for both composite-video
and RGB applications. The amplifiers are capable of
delivering ±2.5V into back-terminated 50Ω or 75Ω
cables, and they deliver ±2V to a 75Ω load, allowing
multiple cables to be driven from a single output.
For implementation of large switch arrays, a low-power
disable mode places the amplifier outputs in a high-
impedance state. Channel selection and output
enable/disable are controlled by four TTL/CMOS-
compatible logic inputs. Each video input is isolated by
an AC-ground pin, which minimizes channel-to-channel
capacitance and reduces crosstalk to 90dB at 10MHz.
The four-channel MAX498 dissipates 390mW (typical)
from ±5VDC power supplies with all output buffers
enabled. Power consumption is reduced to 130mW with
all buffers disabled. The corresponding dissipation for
the three-channel MAX499 is 300mW enabled and
100mW disabled.
MAX498/MAX499
______________Ordering Information
PART
MAX498CWI
MAX499CWG
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
28 SO
24 SO
________________________Applications
Video Switching and Routing
Broadcast-Quality Composite-Video Multiplexing
Workstations
Video Editing
Broadcast and High-Definition TV Systems
Multimedia Products
Medical Imaging
_________________Pin Configurations
TOP VIEW
IN1A 1
GND 2
IN2A 3
GND 4
IN3A 5
V
CC
6
V
EE
7
IN1B 8
GND 9
IN2B 10
GND 11
IN3B 12
24 GND
23 LE
22 EN
21 A0
MAX499
20 CS
19 OUT1
18 V
CC
17 V
EE
16 OUT2
15 N.C.
14 OUT3
13 N.C.
SO
MAX498 appears at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Quad/Triple, SPDT, RGB Switches
with 250MHz Video Buffer Amplifiers
MAX498/MAX499
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
to V
EE
)................................................+12V
Voltage on IN_ _ to GND ..................(V
EE
- 0.3V) to (V
CC
+ 0.3V)
Voltage on Digital Inputs
(LE,
EN,
A0,
CS)
.........................................-0.3V to (V
CC
+ 0.3V)
Voltage on OUT_ (disabled) ..................................................±4V
Output Short-Circuit Duration
to -4V
≤
OUT_
≤
+4V ..................................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
24-Pin SO (derate 11.76mW/°C above +70°C).............941mW
28-Pin SO (derate 12.5mW/°C above +70°C)......................1W
Operating Temperature Range .................................0°C to +70°
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +5V, V
EE
= -5V, V
IN
_ _ = 0V, R
L
= 150Ω, LE =
EN
=
CS
= 0V, T
A
= 0°C to +70°C, unless otherwise noted. Typical values are at
T
A
= +25°C.)
PARAMETER
Input Voltage Range
Voltage Gain
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Resistance
Input Capacitance
Output Short-Circuit Current
Output Current
On Output Resistance
On Output Impedance
Off Output Resistance
Operating Supply-Voltage Range
Positive Power-Supply Rejection
Negative Power-Supply
Rejection
Logic Low Voltage
Logic High Voltage
Logic Input Current
PSR+
PSR-
V
INLL
V
INLH
I
INL
0V
≤
V
INL
≤
V
CC
EN
= 0
Positive Supply Current
I
CC
EN
= 1
EN
= 0
Negative Supply Current
I
EE
EN
= 1
Note 1:
2
Limited by package power dissipation.
MAX498
MAX499
MAX498
MAX499
MAX498
MAX499
MAX498
MAX499
-10
40
31
14
11
38
29
12
9
4.50V
≤
V
CC
≤
5.50V, V
EE
= -5.0V
-5.50V
≤
V
EE
≤
-4.5V, V
CC
= +5.0V
SYMBOL
V
IN
A
V
V
OS
TCV
OS
I
B
R
IN
C
IN
I
OUT(SC)
I
OUT_
R
OUT
f = 10MHz
-2.50V
≤
V
OUT
≤
+2.50V
1.0
±4.50
55
55
0.8
2
130
52
41
17
14
50
39
15
12
mA
mA
72
72
-1.25V
≤
V
IN
≤
+1.25V
Channel on or off
-3.5V
≤
OUT_
≤
+3.5V (Note 1)
-2.0V
≤
V
OUT_
≤
+2.0V, R
L
= 75Ω
±27
200
R
L
= 150Ω, -1.25V
≤
V
IN
≤
+1.25V
R
L
= 75Ω, -1.0V
≤
V
IN
≤
+1.0V
CONDITIONS
MIN
±1.25
1.985
1.965
±2
±50
±1
700
2
120
±40
0.15
3.0
1.2
±5.50
±7
TYP
±1.70
2.030
2.030
±9
MAX
UNITS
V
V/V
mV
µV/°C
µA
kΩ
pF
mA
mA
Ω
Ω
kΩ
V
dB
dB
V
V
µA
_______________________________________________________________________________________
Quad/Triple, SPDT, RGB Switches
with 250MHz Video Buffer Amplifiers
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +5V, V
EE
= -5V, V
IN_ _
= 0V, R
L
= 100Ω, LE =
EN
=
CS
= 0V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Small-Signal, -3dB Bandwidth
±0.1dB Gain Flatness
Full-Power, -3dB Bandwidth
Slew Rate
Settling Time
Input Voltage Noise Density
Input Current Noise Density
Total Harmonic Distortion
Spurious-Free Dynamic Range
Adjacent-Channel Crosstalk
All-Hostile Crosstalk
Off-Isolation
Differential Gain
Differential Phase
Diff Gain
THD
SFDR
FPBW
SR
t
s
SYMBOL
BW
-3dB
CONDITIONS
V
IN
≤
100mVp-p
V
IN
≤
100mVp-p
V
OUT
= ±2V
V
OUT
= 4V step
0.1%, V
OUT
= 4V step
f = 100kHz
f = 100kHz
f = 10MHz
f
C
= 3MHz
f = 10MHz (Note 2)
f = 10MHz (Note 3)
EN
= 1, f = 10MHz (Note 4)
f = 3.58MHz (Note 5), R
L
= 150Ω
Diff Phase f = 3.58MHz (Note 5), R
L
= 150Ω
MIN
TYP
250
70
135
1250
12
7.8
2.6
-50
-66
90
62
81
0.03
0.06
MAX
UNITS
MHz
MHz
MHz
V/µs
ns
nV/√Hz
pA/√Hz
dB
dBc
dB
dB
dB
%
degrees
MAX498/MAX499
TIMING CHARACTERISTICS
(V
CC
= +5V, V
EE
= -5V, V
IN_ _
= 0V, R
L
= 150Ω, LE =
EN
=
CS
= 0V, T
A
= 0°C to +70°C. Typical values are at T
A
= +25°C, unless
otherwise noted.)
PARAMETER
A0/EN to
CS
Setup Time
A0/EN to
CS
Hold Time
CS
Pulse Width
Channel-Switching
Propagation Delay
Channel-Switching Time
Channel-Switching Transient
Enable/Disable Switching
Transient
Amplifier-Disable Time
Amplifier-Enable Time
Note 2:
t
OFF
t
ON
SYMBOL
t
SU
t
H
t
CS
t
PD
t
SW
CONDITIONS
LE = high (Note 6)
LE = high (Note 6)
(Note 6)
(Note 7)
(Note 8)
V
INA
= V
INB
= 0V
V
INA
= V
INB
= 0V
(Note 9)
(Note 10)
Positive
Negative
Positive
Negative
15
20
3
70
50
10
150
16
24
MIN
8
4
TYP
MAX
UNITS
ns
ns
ns
ns
ns
mV
mV
ns
ns
Test-channel input grounded through a 50Ω resistor. Adjacent channel driven to a 2Vp-p output with a 10MHz sine wave
(Figure 9).
Note 3:
Same as Note 2, except all channels but the test channel are driven to a 2Vp-p output with a 10MHz sine wave (Figure 9).
Note 4:
Test-channel input connected to a 2Vp-p sine wave at 10MHz. The test channel’s output is measured with the outputs
disabled (Figure 9).
Note 5:
Input test signal is a 3.58MHz sine wave of 40IRE amplitude, superimposed on a 0IRE to 100IRE linear ramp (Figure 10).
Note 6:
Guaranteed by design.
Note 7:
V
INA
= +1V, V
INB
= -1V, delay from
CS
to 10% of V
OUT.
Note 8:
V
INA
= +1V, V
INB
= -1V, delay from
CS
to 10% of V
OUT.
Note 9:
Delay from
EN
to 90% of V
OUT.
Note 10:
Delay from
EN
to 10% of V
OUT.
_______________________________________________________________________________________
3
Quad/Triple, SPDT, RGB Switches
with 250MHz Video Buffer Amplifiers
MAX498/MAX499
__________________________________________Typical Operating Characteristics
(V
CC
= +5V, V
EE
= -5V, R
L
= 100Ω, T
A
= +25°C, unless otherwise noted.)
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX498/499-01
GAIN FLATNESS
vs. FREQUENCY
MAX498/499-02
LARGE-SIGNAL GAIN
vs. FREQUENCY
7
6
GAIN (dB)
5
4
3
2
1
0
V
OUT
= 2Vp-p
MAX498/499-03
8
7
6
5
GAIN (dB)
4
3
2
1
0
-1
1M
10M
100M
V
IN
= 20mVp-p
6.2
6.1
6.0
5.9
GAIN (dB)
5.8
5.7
5.6
5.5
5.4
5.3
V
IN
= 20mVp-p
8
1G
1M
10M
100M
1G
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN
vs. FREQUENCY
7
6
GAIN (dB)
GAIN (dB)
5
4
3
2
1
0
1M
10M
100M
500M
FREQUENCY (Hz)
-0.06
-0.10
1M
0.06
0.02
-0.02
R
L
= 50Ω
V
OUT
= 2Vp-p
MAX498/499-04
LARGE-SIGNAL GAIN
vs. FREQUENCY
V
OUT
= 2Vp-p
0.10
OUT0–OUT1
OUT0–OUT3
IMPEDANCE (Ω)
MAX498/499-05
OUTPUT IMPEDANCE
vs. FREQUENCY
MAX498/499 TOC-06
8
0.14
1000
100
10
1
OUT0–OUT2
0.1
0.01
10M
FREQUENCY (Hz)
100M
10k
100k
1M
10M
100M
FREQUENCY (Hz)
OFF-ISOLATION
vs. FREQUENCY
MAX498/499-07
CROSSTALK
vs. FREQUENCY
0
-20
CROSSTALK (dB)
PSR (dB)
-40
-60
ADJACENT
-80
-100
-120
-140
ALL HOSTILE
V
OUT
= 2Vp-p
MAX498/499-08
POWER-SUPPLY REJECTION
vs. FREQUENCY
-25
-35
-45
-55
-65
PSR+
-75
-85
-95
PSR-
MAX498/499-09
-20
-30
OFF-ISOLATION (dB)
-40
-50
-60
-70
-80
-90
-100
1M
10M
100M
20
-15
1G
1M
10M
FREQUENCY (Hz)
100M
30k 0.1M
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
4
_______________________________________________________________________________________
Quad/Triple, SPDT, RGB Switches
with 250MHz Video Buffer Amplifiers
____________________________Typical Operating Characteristics (continued)
(V
CC
= +5V, V
EE
= -5V, R
L
= 100Ω, T
A
= +25°C, unless otherwise noted.)
MAX498
SUPPLY CURRENT
vs. TEMPERATURE
MAX498/499-10
MAX498/MAX499
DISABLED SUPPLY CURRENT
vs. TEMPERATURE
EN = HIGH (OUTPUTS DISABLED)
14
CURRENT (mA)
13
12
11
10
9
I
EE
I
CC
MAX498/499-11
GAIN vs. TEMPERATURE
MAX498/499-12
50
15
2.0200
SUPPLY CURRENT (mA)
45
I
CC
40
I
EE
35
SUPPLY CURRENT (mA)
2.0175
V
IN
= +1V
2.0150
V
IN
= -1V
2.0125
30
-55 -35
-15
5
25
45
65
85
TEMPERATURE (°C)
8
-55
-35
-15
5
25
45
65
85
TEMPERATURE (°C)
2.0100
-55 -35
-15
5
25
45
65
85
TEMPERATURE (°C)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX498/499-13
INPUT BIAS CURRENT
vs. TEMPERATURE
8
INPUT BIAS CURRENT (µA)
6
4
2
0
-2
-4
-6
-8
-10
MAX498/499-14
12
10
8
6
4
V
OS
(mV)
2
0
-2
-4
-6
-8
-10
-12
-55
-35
-15
5
25
45
65
10
85
-55
-35
-15
5
25
45
65
85
TEMPERATURE (°C)
TEMPERATURE (°C)
LARGE-SIGNAL
PULSE RESPONSE
MAX498/499 TOC-16
LARGE-SIGNAL
PULSE RESPONSE (C
L
= 47pF)
MAX498/499 TOC-17
LARGE-SIGNAL
PULSE RESPONSE (C
L
= 100pF)
+1
IN 0
VOLTAGE (V)
-1
MAX498/499 TOC-18
+1
IN 0
VOLTAGE (V)
-1
+1
IN 0
VOLTAGE (V)
-1
+2
OUT 0
-2
TIME (10ns/div)
+2
OUT 0
-2
TIME (10ns/div)
+2
OUT 0
-2
TIME (10ns/div)
_______________________________________________________________________________________
5
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