MAX4137 데이터 시트보기 (PDF) - Maxim Integrated
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MAX4137 Datasheet PDF : 12 Pages
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PIN
MAX4137 MAX4138
1, 12, 13, 1, 12, 13,
17, 24
24
2, 11
3
4, 9, 18, 21
5
6, 7
8
10
14
15
16
—
—
19
20
22
23
2, 11
3
4, 9, 21
5
6, 7
8
10
14
15
16
17
18
19
20
22
23
NAME
N.C.
VCCO
OUT1
AGND
OUT2
VEEO
OUT3
OUT4
SEL4
SEL3
VCCI
RF
RG
VEEI
IN+
SEL2
SEL1
1-Input/4-Output
Video Distribution Amplifiers
Pin Description
FUNCTION
No Connect. Not internally connected.
Positive Supply for Output Amplifiers. Connect to +5V.
Output 1
Analog Ground
Output 2
Negative Supply for Output Amplifiers. Connect to -5V.
Output 3
Output 4
When low, enables output channel OUT4. When high, disables output channel OUT4.
When low, enables output channel OUT3. When high, disables output channel OUT3.
Positive Supply for Input Amplifier. Connect to +5V.
Output of Input Amplifier
Inverting Input
Negative Supply for Input Amplifier. Connect to -5V.
Noninverting Input
When low, enables output channel OUT2. When high, disables output channel OUT2.
When low, enables output channel OUT1. When high, disables output channel OUT1.
Detailed Description
The MAX4137/MAX4138 are 1-input/4-output video dis-
tribution amplifiers. The MAX4137 is configured for a
fixed gain of +2, while the MAX4138 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 driving
multiple loads. The TTL/CMOS-compatible digital control
(SEL_) enables or disables each output amplifier. 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 or
disable/enable time is under 25ns, which is useful
in multiplexing, pixel switching, or picture-in-picture
applications.
Each device has an input amplifier, which buffers the
input from any switching glitches that may be taking
place 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 disabled.
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.
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