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MAX4258EUA+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MAX4158/MAX4159/MAX4258/MAX4259
350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers
______________________________________________________________________________________ 13
Driving Capacitive Loads
A correctly terminated transmission line is purely resis-
tive and presents no capacitive load to the amplifier.
Consequently, the MAX4158/MAX4159/MAX4258/
MAX4259 are optimized for AC performance and are
not designed to drive highly capacitive loads. Reactive
loads will decrease phase margin and may produce
excessive ringing and oscillation (see
Typical
Operating Characteristics
). The circuit of Figure 4
reduces this problem. The small (usually 5Ω to 20Ω)
isolation resistor R
ISO
, placed before the reactive load,
prevents ringing and oscillation. At higher capacitive
loads, AC performance is limited by the interaction of
load capacitance with the isolation resistor.
MAX4158
MAX4159
MAX4258
MAX4259
R
G
FB
IN_
R
ISO
OUT
R
F
C
L
R
L
MAX4158
MAX4159
MAX4258
MAX4259
R
G
FB
INO
INI
OUT
R
T
75Ω
R
T
75Ω
R
T
75Ω
75Ω CABLE
75Ω CABLE
R
F
R
T
75Ω
75Ω CABLE
Figure 4. Using an Isolation Resistor (R
ISO
) for High
Capacitive Loads
Figure 3. Video Line Driver
MAX4158/MAX4159/MAX4258/MAX4259
350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers
14 ______________________________________________________________________________________
Input Voltage Range
The guaranteed input voltage range is ±2.5V. Exceeding
this value can cause unpredictable results, including out-
put clipping, excessive input current, and switching
delays.
Multiplexer
The input multiplexer (mux) is controlled by TTL/CMOS-
compatible address inputs (see
Truth Tables
.) There is
no internal memory except the address latch (LE) on
the MAX4159/MAX4259. If power is first applied with
the latch enabled, IN0 is selected.
Input capacitance is a constant, low 2pF for either input
channel, regardless of whether or not the channel is
selected.
All logic levels (EN, LE, and A0) default low if left open-
circuit.
A0
t
S
t
H
ENABLE/DISABLE TIMES
HIGH IMPEDANCE
ADDRESSING TIMES
LE
EN
OUT
OUT
t
SW
t
PdD
t
PdE
t
LPD
t
LPW
Figure 5. Switching Timing Diagram
MAX4158/MAX4159/MAX4258/MAX4259
350MHz/250MHz, 2-Channel
Video Multiplexer-Amplifiers
______________________________________________________________________________________ 15
_____________________Pin Configurations/Functional Diagrams/Truth Tables
___________________Chip Information
TRANSISTOR COUNT: 239
14
13
12
11
10
9
8
1
2
3
4
5
6
7
LE
A0
OUT
V+
GND
IN0
GND
EN
MAX4159/MAX4259
GND
FB
GND
V-
GND
IN1
SO
N.C. = NOT INTERNALLY CONNECTEDX = DON’T CARE
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
LE
N.C.
A0
OUT
V+
GND
FB
GND
EN
GND
IN0
GND
IN1
GND
N.C.
V-
MAX4159/MAX4259
QSOP
TOP VIEW
LOGIC
LOGIC
EN
0
1
OUTPUT
MAX4159/MAX4259
ON
OFF (HI-Z)
LE
0
0
1
A0
0
1
X
INPUT
MAX4159/MAX4259
IN0
IN1
LAST
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX4258EUA+

Mfr. #:
Buy MAX4258EUA+
Manufacturer:
Maxim Integrated
Description:
Video Amplifiers 350MHz/250MHz 2Ch Video MUX-Amplifier
Lifecycle:
New from this manufacturer.
Delivery:
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