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參數(shù)資料
| 型號： | MAX499 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 繼電器，輸入/輸出模塊 |
| 英文描述： | 30 AMP MINIATURE POWER RELAY |
| 中文描述： | 四路-三路、SPDT、RGB開關(guān)，帶有250MHz視頻緩沖放大器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 155K |
| 代理商： | MAX499 |
M
Quad/Triple, S PDT, RGB S witc hes
with 250MHz Video Buffer Amplifiers
______________________________________________________________________________________
13
Another option for output disable is to connect LE to V+,
parallel the outputs of several MAX498/MAX499s, and use
(Figure 8b).
When the outputs are disabled, off-isolation from the
analog inputs to the amplifier outputs is typically 81dB
at 10MHz.
Grounding and Layout
The MAX498/MAX499 bandwidths are in the RF fre-
quency range. Depending on the size of the PC board
used and the frequency of operation, it may be neces-
sary to use Micro-strip or Stripline techniques.
To realize the full AC performance of these high-speed
buffers, pay careful attention to power-supply bypassing
and board layout. The PC board should have at least two
layers (wire-wrap boards are too inductive, and bread
boards are too capacitive), with one side a signal layer
and the other a large, low-impedance ground plane. With
multilayer boards, locate the ground plane on the layer
that is not dedicated to a specific signal trace. The ground
plane should be as free from voids as possible. Connect
all ground pins to the ground plane.
Connect both positive power-supply pins together and
bypass with a 0.10μF ceramic capacitor at each power-
supply pin, as close to the device as possible. Repeat
for the negative power-supply pins. The capacitor lead
lengths should be as short as possible to minimize lead
inductance; surface-mount chip capacitors are ideal. A
large-value (10μF or greater) tantalum or electrolytic
bypass capacitor on each supply may be required for
high-current loads. The location of this capacitor is not
critical.
The MAX498/MAX499’s analog input pins are isolated
with ground pins to minimize parasitic coupling, which can
degrade crosstalk and/or amplifier stability. Keep signal
paths as short as possible to minimize inductance. Ensure
that all input channel traces are the same length, to main-
tain the phase relationship between the four channels. To
further reduce crosstalk, connect the coaxial-cable shield
to the ground side of the 75
terminating resistor at the
ground plane, and terminate all unused inputs to ground
and outputs with a 100
or 150
resistor to ground.
Enables amplifier outputs. Selects
channel B.
1
0
0
Disables amplifiers. Outputs high-Z.
A0 latch = channel A.
X
1
X
Enables amplifier outputs. Latches A0
to output A or B, according to A0’s
X
0
1
Enables amplifier outputs. Selects
channel A.
0
0
0
FUNCTION
A0
EN
CE
Latches A0,
EN
. Outputs unchanged.
Enables amplifier outputs. Selects
channel B.
Enables amplifier outputs. Selects
channel A.
X
X
1
Disables amplifiers. Outputs high-Z.
X
1
0
1
0
0
0
0
0
FUNCTION
A0
EN
CS
Table 1a. Amplifier and Channel
Selection with LE = V+
Table 1b. Amplifier and Channel
Selection with LE = GND
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PDF描述 |
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| MAX498 | High-Output RS-485 Transceiver 8-PDIP -40 to 85 |
| MAX499CWG | Quad/Triple, SPDT, RGB Switches with 250MHz Video Buffer Amplifiers |
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| MAX500AEJE | Circular Connector; No. of Contacts:128; Series:MS27466; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:25; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
| MAX500AEWE | Circular Connector; No. of Contacts:22; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:13; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:13-35 RoHS Compliant: No |
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