參數(shù)資料
型號： MAX498CWI
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 運動控制電子
英文描述： Quad/Triple, SPDT, RGB Switches with 250MHz Video Buffer Amplifiers
中文描述： QUAD 1-CHANNEL, AUDIO/VIDEO SWITCH, PDSO28
封裝： 0.300 INCH, SOP-28
文件頁數(shù)： 11/16頁
文件大?。?/td> 155K
代理商： MAX498CWI
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
相關PDF資料
PDF描述
MAX499 30 AMP MINIATURE POWER RELAY
MAX498 High-Output RS-485 Transceiver 8-PDIP -40 to 85
MAX499CWG Quad/Triple, SPDT, RGB Switches with 250MHz Video Buffer Amplifiers
MAX500BEJE CMOS, Quad, Serial-Interface 8-Bit DAC
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
相關代理商/技術參數(shù)
參數(shù)描述
MAX498CWI+ 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16
MAX498CWI+T 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16
MAX498CWI-T 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16
MAX4990EDT+T 制造商:Maxim Integrated Products 功能描述:LINE DRIVER - Tape and Reel
MAX4990ETD+ 制造商:Maxim Integrated Products 功能描述:HIGHVOLTAGE,?15KV ESD-PROTECTED ELECTROLUMINESCENTLAMPDRIVER - Rail/Tube
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