MAX4138 MAXIM [Maxim Integrated Products], MAX4138 Datasheet - Page 7

• Manufacturer Part Number: MAX4138
• Description: 1-Input/6-Output Video Distribution Amplifiers
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX4135/MAX4136 are 1-input/6-output video dis-
tribution amplifiers. The MAX4135 is configured for a
fixed gain of +2, while the MAX4136 features external
gain control (feedback) for closed-loop gains of 2V/V or
greater.
Each output provides sufficient current to drive five
150Ω loads. However, distortion will increase when dri-
ving multiple loads. The TTL/CMOS-compatible digital
control (SEL_ ) enables or disables each output amplifi-
er. When the SEL_ control input is low, the amplifier is
enabled; when it is high, the amplifier is disabled and
presents a high-impedance output. The enable/disable
______________________________________________________________Pin Description
_______________Detailed Description
4, 9, 18, 21
MAX4135
2, 11
6, 7
10
12
13
14
15
16
17
19
20
22
23
24
—
—
1
3
5
8
PIN
MAX4136
4, 9, 21
2, 11
6, 7
10
12
13
14
15
16
—
17
18
19
20
22
23
24
1
3
5
8
_______________________________________________________________________________________
NAME
AGND
VCCO
OUT1
OUT2
OUT3
VEEO
OUT4
OUT5
OUT6
SEL6
SEL5
SEL4
VCCI
SEL3
SEL2
SEL1
VEEI
N.C.
IN+
RG
RF
Output 1
Positive Supply for Output Amplifiers. Connect to +5V.
Output 2
Analog Ground
Output 3
Negative Supply for Output Amplifiers. Connect to -5V.
Output 4
Output 5
Output 6
When low, enables output channel OUT6. When high, disables output channel OUT6.
When low, enables output channel OUT5. When high, disables output channel OUT5.
When low, enables output channel OUT4. When high, disables output channel OUT4.
Positive Supply for Input Amplifier. Connect to +5V.
No Connect. Not internally connected.
Output of Input Amplifier
Inverting Input
Negative Supply for Input Amplifier. Connect to -5V.
Noninverting Input
When low, enables output channel OUT3. When high, disables output channel OUT3.
When low, enables output channel OUT2. When high, disables output channel OUT2.
When low, enables output channel OUT1. When high, disables output channel OUT1.
Video Distribution Amplifiers
or disable/enable time is under 25ns, which is useful in
multiplexing, pixel switching, or picture-in-picture appli-
cations.
Each device has an input amplifier, which buffers the
input from any switching glitches that may occur at the
output stage, and provides a high-impedance, low-
capacitance input. The separate input buffer allows a
true high output impedance when an amplifier is dis-
abled.
The outputs are protected against short circuits to
ground. However, power-dissipation limits preclude
shorting all output channels to ground. See the Power-
Dissipation Considerations section for details.
FUNCTION
1-Input/6-Output
7