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參數資料
| 型號： | 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，帶有250MHz視頻緩沖放大器 |
| 文件頁數： | 11/16頁 |
| 文件大?。?/td> | 155K |
| 代理商： | MAX498 |
M
Quad/Triple, S PDT, RGB S witc hes
with 250MHz Video Buffer Amplifiers
______________________________________________________________________________________
11
Coaxial Cable Drivers
High-speed performance, excellent output current
capability, and an internally fixed gain of +2 make the
MAX498/MAX499 ideal for driving back-terminated 50
or 75
coaxial cables to ±2.5V.
In a typical application, the MAX498/MAX499 drive a
back-terminated cable (Figure 1). The back-termination
resistor, at the output, matches the impedance of the
cable’s driven end to the cable’s impedance, eliminating
signal reflections. This resistor, along with the load-
termination resistor, forms a voltage divider with the load
impedance, which attenuates the signal at the cable’s
output by one-half. The MAX498/MAX499 operate with
an internal +2V/V closed-loop gain to provide unity gain
at the cable’s output.
Capac itive-Load Driving
In most amplifier circuits, driving large capacitive loads
increases the likelihood of oscillation. This is especially
true for circuits with high loop gains, such as voltage
followers. The amplifier’s output resistance and the
capacitive load form an RC filter that adds a pole to the
loop response. If the pole frequency is low enough (as
when driving a large capacitive load), the circuit-phase
margin is degraded and oscillation may occur.
The MAX498/MAX499 drive capacitive loads up to
100pF without sustained oscillation, although some
peaking may occur (Figures 3a and 3b). When driving
larger capacitive loads, or to reduce peaking, add an
isolation resistor (R
ISO
) between the output and the
capacitive load (Figures 4a, 4b, and 5).
Figure 3a. Small-Signal Gain vs. Frequency and Load
Capacitor (R
L
= 100
, R
ISO
= 0
)
Figure 3b. Small-Signal Gain vs. Frequency and Load
Capacitor (R
L
= 100
, R
ISO
= 6.8
)
1M
14
12
10
8
6
4
2
0
-2
-4
-6
10M
FREQUENCY (Hz)
1G
MAX186/MAX188
FULL POWER-DOWN
G
100M
R
ISO
= 0
100pF
47pF
0pF
1M
14
12
10
8
6
4
2
0
-2
-4
-6
10M
FREQUENCY (Hz)
1G
MAX186/MAX188
FULL POWER-DOWN
G
100M
R
ISO
= 6.8
150pF
100pF
47pF
0pF
Figure 4a. Large-Signal Pulse Response with C
L
= 100pF and
R
ISO
= 5.1
Figure 4b. Small-Signal Pulse Response with C
L
= 100pF and
R
ISO
= 5.1
V
OUT
-200
+200
V
IN
+100
-100
TIME (10ns/div)
V
-2
-1
+1
+2
V
IN
V
OUT
TIME (10ns/div)
V
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