Maxim MAX499CWG Datasheet

19-1143; Rev 0; 10/96

EVALUATION KIT

AVAILABLE

Quad/Triple, SPDT, RGB Switches

with 250MHz Video Buffer Amplifiers

_______________General Description

The MAX498/MAX499 are high-speed, quad/triple, sin­gle-pole/double-throw video switches with on-board
closed-loop buffer amplifiers. The buffer amplifiers fea­ture +6dB gain (A

= 2V/V), 250MHz -3dB band-

VCL

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 high­impedance state. Channel selection and output
enable/disable are controlled by four TTL/CMOS­compatible 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.

________________________Applications

Video Switching and Routing
Broadcast-Quality Composite-Video Multiplexing
Workstations
Video Editing
Broadcast and High-Definition TV Systems
Multimedia Products
Medical Imaging

____________________________Features

♦ High Speed:

250MHz Small-Signal -3dB Bandwidth
135MHz Full-Power -3dB Bandwidth

♦ 70MHz 0.1dB Gain Flatness
♦ 1250V/µs Slew Rate
♦ 12ns to 0.1% Settling Time
♦ 0.03°/0.06% Differential Phase/Gain Error
♦ 2pF Input Capacitance
♦ 3ns Channel-Switching Time
♦ 120mVp-p Channel-Switching Transient
♦ Three-State Output Allows Large Switch Arrays
♦ Directly Drives 50Ω or 75Ω Back-Terminated

Cables

______________Ordering Information

PART

MAX498CWI
MAX499CWG

TEMP. RANGE PIN-PACKAGE

0°C to +70°C
0°C to +70°C

28 SO
24 SO

_________________Pin Configurations

TOP VIEW

MAX498 appears at end of data sheet.

IN1A
GND
IN2A
GND
IN3A

V

IN1B
GND
IN2B
GND
IN3B

1
2
3
4

MAX499

5
6

CC

V

7

EE

8

9
10
11
12

SO

GND

24
23

LE

22

EN

21

A0

20

CS
OUT1

19

V

18

CC

V

17

EE

OUT2

16

N.C.

15

OUT3

14

N.C.

13



MAX498/MAX499

________________________________________________________________

Maxim Integrated Products

1

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone]

Quad/Triple, SPDT, RGB Switches
with 250MHz Video Buffer Amplifiers

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (VCCto VEE)................................................+12V

Voltage on IN__ to GND..................(V

Voltage on Digital Inputs

(LE, EN, A0, CS).........................................-0.3V to (V

Voltage on OUT_ (disabled)..................................................±4V

Output Short-Circuit Duration

to -4V ≤ OUT_ ≤ +4V ..................................................Continuous

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.

- 0.3V) to (VCC+ 0.3V)

EE

CC

+ 0.3V)

Continuous Power Dissipation (T

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

DC ELECTRICAL CHARACTERISTICS

(VCC= +5V, VEE= -5V, VIN__ = 0V, RL= 150Ω, LE = EN = CS = 0V, TA= 0°C to +70°C, unless otherwise noted. Typical values are at

= +25°C.)

T

A

MAX498/MAX499

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 ±27 ±40
On Output Resistance

Negative Power-Supply
Rejection

Logic Low Voltage
Logic High Voltage
Logic Input Current

Positive Supply Current

Negative Supply Current

Note 1: Limited by package power dissipation.

2 _______________________________________________________________________________________

IN

A

V

OS

OS
B
IN
IN

OUT(SC)

OUT_

OUT

INLL
INLH

INL

I

CC

I

EE

RL= 150Ω, -1.25V ≤ VIN≤ +1.25V
RL= 75Ω, -1.0V ≤ VIN≤ +1.0V

-1.25V ≤ VIN≤ +1.25V
Channel on or off

-3.5V ≤ OUT_ ≤ +3.5V (Note 1)

-2.0V ≤ V

f = 10MHz

-2.50V ≤ V

4.50V ≤ VCC≤ 5.50V, VEE= -5.0V

-5.50V ≤ VEE≤ -4.5V, VCC= +5.0V

0V ≤ V

INL

EN = 0

EN = 1

EN = 0

EN = 1

CONDITIONS

≤ +2.0V, RL= 75Ω

OUT_

≤ +2.50V

OUT

≤ V

CC

MAX498
MAX499 31 41
MAX498
MAX499
MAX498
MAX499
MAX498
MAX499

= +70°C)

A

1.985 2.030

1.965 2.030

40 52

14 17
11 14
38 50
29 39
12 15

912

UNITSMIN TYP MAXSYMBOLPARAMETER

µV/°C±50TCV

V±1.25 ±1.70V
V/V
mV±2 ±9V

µA±1 ±7I
kΩ200 700R

pF2C
mA120I
mAI

Ω0.15R
Ω3.0On Output Impedance

kΩ1.0 1.2Off Output Resistance

V±4.50 ±5.50Operating Supply-Voltage Range

dB55 72PSR+Positive Power-Supply Rejection

dB55 72PSR-

V0.8V
V2V

µA-10 130I

mA

mA

Quad/Triple, SPDT, RGB Switches

with 250MHz Video Buffer Amplifiers

AC ELECTRICAL CHARACTERISTICS

(VCC= +5V, VEE= -5V, V

Small-Signal, -3dB Bandwidth

Settling Time

= 0V, RL= 100Ω, LE = EN = CS = 0V, TA= +25°C, unless otherwise noted.)

IN__

CONDITIONS

VIN≤ 100mVp-p MHz250BW

-3dB

VIN≤ 100mVp-p MHz70±0.1dB Gain Flatness
V

= ±2V MHz135FPBWFull-Power, -3dB Bandwidth

OUT

V

= 4V step V/µs1250SRSlew Rate

OUT

0.1%, V

s

f = 100kHz
f = 100kHz
f = 10MHz
fC= 3MHz
f = 10MHz (Note 2)
f = 10MHz (Note 3)
EN = 1, f = 10MHz (Note 4)
f = 3.58MHz (Note 5), RL= 150Ω
f = 3.58MHz (Note 5), RL= 150Ω

OUT

= 4V step ns12t

UNITSMIN TYP MAXSYMBOLPARAMETER

7.8Input Voltage Noise Density

2.6Input Current Noise Density

0.06Diff PhaseDifferential Phase

nV/√Hz

pA/√Hz

dB-50THDTotal Harmonic Distortion

dBc-66SFDRSpurious-Free Dynamic Range

dB90Adjacent-Channel Crosstalk
dB62All-Hostile Crosstalk
dB81Off-Isolation

%0.03Diff GainDifferential Gain

degrees

TIMING CHARACTERISTICS

(VCC= +5V, VEE= -5V, V
otherwise noted.)

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: Test-channel input grounded through a 50Ω resistor. Adjacent channel driven to a 2Vp-p output with a 10MHz sine wave

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 2V

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
Note 8: V
Note 9: Delay from EN to 90% of V
Note 10: Delay from EN to 10% of V

(Figure 9).

disabled (Figure 9).

= +1V, V

INA

= +1V, V

INA

= 0V, RL= 150Ω, LE = EN = CS = 0V, TA= 0°C to +70°C. Typical values are at TA= +25°C, unless

IN_ _

CONDITIONS

LE = high (Note 6)

SU

LE = high (Note 6)

H

(Note 6)

CS

(Note 7)

PD

(Note 8)

SW

V

INA

V

INA

(Note 9) 16 nst

OFF

(Note 10) 24 nst

ON

p-p

= -1V, delay from CS to 10% of V

INB

= -1V, delay from CS to 10% of V

INB

OUT.
OUT.

= V

= 0V

INB

= V

= 0V

INB

sine wave at 10MHz. The test channel’s output is measured with the outputs

OUT.
OUT.

Positive
Negative 50
Positive
Negative

70

10

150

UNITSMIN TYP MAXSYMBOLPARAMETER

ns8t
ns4t
ns15t

ns20t
ns3t

mV

mV

MAX498/MAX499

_______________________________________________________________________________________ 3

Quad/Triple, SPDT, RGB Switches
with 250MHz Video Buffer Amplifiers

__________________________________________Typical Operating Characteristics

(VCC= +5V, VEE= -5V, RL= 100Ω, TA = +25°C, unless otherwise noted.)

SMALL-SIGNAL GAIN

V

= 20mVp-p

IN

LARGE-SIGNAL GAIN

RL = 50Ω

= 2Vp-p

V

OUT

vs. FREQUENCY

100M

FREQUENCY (Hz)

vs. FREQUENCY

100M

FREQUENCY (Hz)

8
7
6
5
4
3

GAIN (dB)

2
1

MAX498/MAX499

0

-1
1M 10M 1G

8
7

6
5
4

GAIN (dB)

3
2
1
0

1M 10M 500M

MAX498/499-01

MAX498/499-04

GAIN (dB)

GAIN FLATNESS

V

= 20mVp-p

IN

LARGE-SIGNAL GAIN 

vs. FREQUENCY

V

= 2Vp-p

OUT

vs. FREQUENCY

100M

FREQUENCY (Hz)

OUT0–OUT1

OUT0–OUT3

OUT0–OUT2

FREQUENCY (Hz)

6.2

6.1

6.0

5.9

5.8

5.7

GAIN (dB)

5.6

5.5

5.4

5.3
1M 10M 1G

0.14

0.10

0.06

0.02

-0.02

-0.06

-0.10
1M 10M

100M

LARGE-SIGNAL GAIN

8
7

MAX498/499-02

6
5
4

GAIN (dB)

3
2
1
0

1M 10M 1G

1000

MAX498/499-05

100

10

1

IMPEDANCE (Ω)

0.1

0.01
10k 100k 1M 10M 100M

vs. FREQUENCY

V

= 2Vp-p

OUT

FREQUENCY (Hz)

OUTPUT IMPEDANCE 

vs. FREQUENCY

FREQUENCY (Hz)

MAX498/499-03

100M

MAX498/499 TOC-06

OFF-ISOLATION

-20

-30

-40

-50

-60

-70

OFF-ISOLATION (dB)

-80

-90

-100
1M 10M 1G

vs. FREQUENCY

100M

FREQUENCY (Hz)

MAX498/499-07

CROSSTALK (dB)

-100

-120

-140

20

= 2Vp-p

V

OUT

0

-20

-40

-60

-80

1M 10M

CROSSTALK

vs. FREQUENCY

ALL HOSTILE

FREQUENCY (Hz)

ADJACENT

100M

MAX498/499-08

PSR (dB)

POWER-SUPPLY REJECTION

-15

-25

-35

-45

-55

-65

-75

-85

-95

vs. FREQUENCY

1M0.1M30k 10M

FREQUENCY (Hz)

4 _______________________________________________________________________________________

MAX498/499-09

PSR-

PSR+

100M

Quad/Triple, SPDT, RGB Switches

with 250MHz Video Buffer Amplifiers

____________________________Typical Operating Characteristics (continued)

(VCC= +5V, VEE= -5V, RL= 100Ω, TA = +25°C, unless otherwise noted.)

MAX498 

SUPPLY CURRENT

50

45

40

SUPPLY CURRENT (mA)

35

30

vs. TEMPERATURE

I

CC

I

EE

-55 -35 -15 5 25 45 65 85
TEMPERATURE (°C)

INPUT OFFSET VOLTAGE

vs. TEMPERATURE

-55-35-15 5 25 45 65 85

(mV)

OS

V

12
10

8
6
4
2
0

-2

-4

-6

-8

-10

-12

MAX498/499-10

CURRENT (mA)

TEMPERATURE (°C)

DISABLED SUPPLY CURRENT

15

14

13
12

11

10

9

8

-55-35-15 5 25 45 65 85

vs. TEMPERATURE

EN = HIGH (OUTPUTS DISABLED)

I

CC

I

EE

TEMPERATURE (°C)

MAX498/499-13

2.0200

MAX498/499-11

2.0175

2.0150

SUPPLY CURRENT (mA)

2.0125

2.0100

INPUT BIAS CURRENT

10

8
6
4
2
0

-2

-4

INPUT BIAS CURRENT (µA)

-6

-8

-10

vs. TEMPERATURE

-55-35-15 5 25 45 65 85
TEMPERATURE (°C)

GAIN vs. TEMPERATURE

-55 -35 -15 5 25 45 65 85

V

IN

TEMPERATURE (°C)

= +1V

MAX498/499-14

V

= -1V

IN

MAX498/MAX499

MAX498/499-12

+1

0

IN

-1

+2

VOLTAGE (V)

OUT

0

-2



LARGE-SIGNAL

PULSE RESPONSE

TIME (10ns/div)

MAX498/499 TOC-16

VOLTAGE (V)

OUT

+1

0

IN

-1

+2

0

-2



LARGE-SIGNAL

PULSE RESPONSE (C

TIME (10ns/div)

= 47pF)

L

MAX498/499 TOC-17

VOLTAGE (V)

OUT

+1

0

IN

-1

+2

0

-2



LARGE-SIGNAL

PULSE RESPONSE (C

TIME (10ns/div)

L

_______________________________________________________________________________________

= 100pF)

MAX498/499 TOC-18

5