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參數(shù)資料
| 型號： | AD8039 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Power 350 MHz Voltage Feedback Amplifiers |
| 中文描述： | 低功率350 MHz的電壓反饋放大器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 346K |
| 代理商： | AD8039 |
REV. B
–10–
AD8038/AD8039
The AD9203 works best when the common-mode voltage at the
input is at the midsupply or 2.5 V. The output stage design of
the AD8039 makes it ideal for driving these types of ADCs.
In this circuit, one of the op amps is configured in the inverting
mode, while the other is in the noninverting mode. However, to
provide better bandwidth matching, each op amp is configured
for a noise gain of +2. The inverting op amp is configured for a
gain of –1, while the noninverting op amp is configured for a
gain of +2. Each has a very similar ac response. The input signal
to the noninverting op amp is divided by 2 to normalize its
voltage level and make it equal to the inverting output.
The outputs of the op amps are centered at 2.5 V, which is the
midsupply level of the ADC. This is accomplished by first taking
the 2.5 V reference output of the ADC and dividing it by 2 with a
pair of 1 k
resistors. The resulting 1.25 V is applied to each op
amp’s positive input. This voltage is then multiplied by the gain of
the op amps to provide a 2.5 V level at each output.
Low Power Active Video Filter
Some composite video signals derived from a digital source
contain clock feedthrough that can limit picture quality. Active
filters made from op amps can be used in this application, but
they will consume 25 mW to 30 mW for each channel. In
power-sensitive applications, this can be too much, requiring the
use of passive filters that can create impedance matching prob-
lems when driving any significant load.
The AD8038 can be used to make an effective low-pass active
filter that consumes one-fifth of the power consumed by an
active filter made from an op amp. Figure 4 shows a circuit that
uses an AD8038 to create a single
±
2.5 V supply, three-pole
Sallen-Key filter. This circuit uses a single RC pole in front
of a standard two-pole active section.
0.1 F
+2.5V
10 F
–2.5V
0.1 F
10 F
C3
33pF
R3
49.9k
R
F
1k
680pF
R5
49.9k
R2
499k
C1
100pF
R1
200k
R4
49.9k
AD8038
V
IN
V
OUT
Figure 4. Low-Pass Filter for Video
Figure 5 shows the frequency response of this filter. The response
is down 3 dB at 6 MHz, so it passes the video band with little
attenuation. The rejection at 27 MHz is 45 dB, which provides
more than a factor of 100 in suppression of the clock components
at this frequency.
FREQUENCY – MHz
0.1
G
1
10
100
–10
10
0
–20
–30
–40
–50
–60
Figure 5. Video Filter Response
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8039AR | Low Power 350 MHz Voltage Feedback Amplifiers |
| AD8039ART-REEL | Low Power 350 MHz Voltage Feedback Amplifiers |
| AD8039ART-REEL7 | Low Power 350 MHz Voltage Feedback Amplifiers |
| AD8039AR-REEL | Low Power 350 MHz Voltage Feedback Amplifiers |
| AD8039AR-REEL7 | Low Power 350 MHz Voltage Feedback Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD-8039 | 制造商:BOTHHAND 制造商全稱:Bothhand USA, LP. 功能描述:ADSL CPE SIDE SPLITTER |
| AD8039AR | 功能描述:IC OPAMP VF DUAL LP LN 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:管件 |
| AD8039AR-REEL | 制造商:Analog Devices 功能描述:OP Amp Dual Volt Fdbk |
| AD8039AR-REEL7 | 功能描述:IC OPAMP VF DUAL LP LN 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 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) |
| AD8039ART-EBZ | 功能描述:BOARD EVAL FOR AD8039ART RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 運算放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
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