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參數(shù)資料
| 型號(hào)： | MAX498 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Output RS-485 Transceiver 8-PDIP -40 to 85 |
| 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)： | 12/16頁 |
| 文件大小： | 155K |
| 代理商： | MAX498 |
M
Quad/Triple, S PDT, RGB S witc hes
with 250MHz Video Buffer Amplifiers
12
______________________________________________________________________________________
S witc hing Audio S ignals
(Audio-Distortion Measurement)
When switching audio signals, distortion is the prime
consideration in performance. Figure 6 shows total
harmonic distortion vs. frequency, in the audio range,
for the MAX498/MAX499.
Large S witc h Arrays
Large crosspoint switch arrays are possible with the
MAX498/MAX499 using the enable function
EN
. When
the amplifiers are disabled, output impedance is typi-
cally 1.2k
,
due to the feedback and gain resistors.
This limits the number of outputs that can be paralleled
without a buffer. Since each output can drive 100
,
eight outputs can typically be connected together. If
additional outputs must be connected in parallel, a
MAX4178 (single), MAX496 (quad), or equivalent unity-
gain buffer can be used.
Whether enabled or disabled, each input represents
more than 200k
of resistance. Capacitance is the
prime consideration limiting the number of inputs that
can be connected to a single output. Since each output
can drive 100pF of capacitance without an isolation
resistor, 50 inputs (C
IN
= 2pF, typical) can be driven
by a single output. However, peaking will occur as
inputs are added (Figure 3), which reduces the 0.1dB
bandwidth.
Digital Interfac e
The MAX498/MAX499 multiplexer architecture ensures
that no input channels are ever connected together.
Select a channel by changing A0’s state (A0 = 0 for
channel A, and A0 = 1 for channel B) and pulsing
CS
low
(see Tables 1a and 1b). Figure 7 shows the logic timing
diagram.
When the enable input (E—–) is driven to a TTL low state, it
enables the MAX498/MAX499 amplifier outputs. When E—–
is driven high, it disables the amplifier outputs. When
disabled, the MAX498/MAX499 exhibit a 1.2k
dis-
abled output resistance due to their internal feedback
resistors.
LE determines whether E—–is latched by
CS
or operates
independently. W becomes the latch control for the E—–
nected to V+,
CS
input register. If
CS
is low, both the E—–and A0 latches
are transparent; once
CS
returns high, both A0 and E—–
are latched.
When LE is connected to ground, the E—–latch is trans-
parent and independent of
CS
. This allows all
MAX498/MAX499 devices to be shut down simultane-
CS’
s input state. Simply connect
ously, regardless of
(Figure 8a). Hard wire LE to V+ or ground (rather than
driving LE with a gate) to prevent crosstalk from the
digital inputs to IN0A.
Figure 6. Total Harmonic Distortion (Audio) vs. Frequency
10
-82
-84
-86
-88
-90
-92
-94
-96
-98
100
10k
MAX186/MAX188
FULL POWER-DOWN
FREQUENCY (Hz)
D
1k
2
47
COMPARATOR INPUT BIAS CURRENT
vs. SUPPLY VOLTAGE
CAPACITANCE (pF)
I
)
3
4
5
6
7
8
100
150
200
270
390
510
Figure 5. Isolation Resistor vs. Capacitive Load
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX499CWG | Quad/Triple, SPDT, RGB Switches with 250MHz Video Buffer Amplifiers |
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| 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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