參數(shù)資料
型號(hào)： LM7131ACM
廠(chǎng)商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 音頻／視頻放大
英文描述： Tiny High Speed Single Supply Operational Amplifier
中文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝： SO-8
文件頁(yè)數(shù)： 18/23頁(yè)
文件大?。?/td> 548K
代理商： LM7131ACM
Using the LM7131
(Continued)
CCD Amplifiers
The LM7131 has enough gain bandwidth to amplify low level
signals from a CCD or similar image sensor and drive a flash
analog-to-digital converter with one amplifier stage.
Signals from CCDs, which are used in scanners, copiers,
and digital cameras, often have an output signal in the 100
mV–300 mV range. See Figure 14for a conceptual diagram.
With a gain of 6 the output to the flash analog-to- digital con-
verter is 1.8V, matching 90% of the converter’s 2V input
range. With a 3db bandwidth of 70 MHz for a gain of +1, the
bandwidth at a gain of 6 will be 11.6 MHz. This 11.6 MHz
bandwidth will result in a time constant of about 13.6 ns. This
will allow the output to settle to 7 bits of accuracy within 4.9
time constants, or about 66 ns. Slewing time for a 1.8V step
will be about 12 ns. The total slewing and settling time will be
about 78 ns of the 150 ns pixel valid time. This will leave
about 72 ns total for the flash converter signal acquisition
time and tolerance for timing signals.
For scanners and copiers with moving scan bars, the
SOT23-5 package is small enough to be placed next to the
light sensor. The LM7131 can drive a cable to the main elec-
tronics section from the scan bar. This can reduce noise
pickup by amplifying the signal before sending on the cable.
A/D Reference Drivers
The LM7131’s output and drive capability make it a good
choice for driving analog-to-digital references which have
suddenly changing loads. The small size of the SOT23-5
package allow the LM7131 to be placed very close to theA/D
reference pin, maximizing response. The small size avoids
the penalty of increased board space. Often the SOT23-5
package is small enough that it can fit in space used by the
large capacitors previously attached to theA/D reference. By
acting as a buffer for a reference voltage, noise pickup can
be reduced and the accuracy may be increased.
For additional space savings, the LM4040 precision voltage
reference and LM385 low current voltage reference are
available in a tiny SOT23-3 package.
Video Gain of +2
The design of the LM7131 has been optimized for gain of +2
video applications. Typical values for differential gain and
phase are 0.25% differential gain and 0.75 degree differen-
tial phase. See Figure 12
Improving Video Performance
Differential gain and phase performance can be improved by
keeping the active video portion of the signal above 300 mV.
The sync signal can go below 300 mV without affecting the
video quality. If it is possible toAC couple the signal and shift
the output voltage slightly higher, much better video perfor-
mance is possible. For a +5V single supply, an output range
between 2.0V and 3.0V can have a differential gain of 0.07%
and differential phase of 0.3 degree when driving a 150
load. For a +3V single supply, the output should be between
1.0V and 2.0V.
Cable Driving with +5V Supplies
The LM7131 can easily drive a back-terminated 75
video
cable (150
load) when powered by a +5V supply. See Fig-
ures 2, 3, 4 This makes it a good choice for video output for
portable equipment, personal digital devices, and desktop
video applications.
DS012313-21
FIGURE 13.
www.national.com
18
相關(guān)PDF資料
PDF描述
LM7131ACM5 Tiny High Speed Single Supply Operational Amplifier
LM7131ACMX Tiny High Speed Single Supply Operational Amplifier
LM7131BCM Tiny High Speed Single Supply Operational Amplifier
LM7131BCM5 Tiny High Speed Single Supply Operational Amplifier
LM7131BCMX Tiny High Speed Single Supply Operational Amplifier
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM7131ACM5 制造商:Rochester Electronics LLC 功能描述:- Bulk
LM7131ACM5X 制造商:Texas Instruments 功能描述:
LM7131ACMX 功能描述:IC OP AMP TINY HS SNG SUPP 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類(lèi)型:電壓反饋 電路數(shù):4 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR)
LM7131ACN 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:IC-HIGH SPEED OP AMP
LM7131BCM 制造商:Rochester Electronics LLC 功能描述:- Bulk
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