參數(shù)資料
型號(hào)： MAX499CWG
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 運(yùn)動(dòng)控制電子
英文描述： Quad/Triple, SPDT, RGB Switches with 250MHz Video Buffer Amplifiers
中文描述： TRIPLE 1-CHANNEL, AUDIO/VIDEO SWITCH, PDSO24
封裝： 0.300 INCH, SOP-24
文件頁(yè)數(shù)： 11/16頁(yè)
文件大小： 155K
代理商： MAX499CWG
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX499CWG+ 功能描述:多路器開(kāi)關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開(kāi)關(guān)數(shù)量:4 開(kāi)啟電阻（最大值）:7 Ohms 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16
MAX499CWG+T 功能描述:視頻開(kāi)關(guān) IC RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:4 開(kāi)啟電阻（最大值）:12 Ohms 傳播延遲時(shí)間: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel
MAX499CWG-T 功能描述:視頻開(kāi)關(guān) IC RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:4 開(kāi)啟電阻（最大值）:12 Ohms 傳播延遲時(shí)間: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel
MAX-50 功能描述:保險(xiǎn)絲 MAXI FUSE RoHS:否 制造商:Littelfuse 產(chǎn)品:Surface Mount Fuses 電流額定值:0.5 A 電壓額定值:600 V 保險(xiǎn)絲類型:Fast Acting 保險(xiǎn)絲大小/組:Nano 尺寸:12.1 mm L x 4.5 mm W 安裝風(fēng)格: 端接類型:SMD/SMT 系列:485
MAX500 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:CMOS, Quad, Serial-Interface 8-Bit DAC
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