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| 型號(hào)： | AD8045ACPZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 13/25頁(yè) |
| 文件大小： | 0K |
| 描述： | IC OPAMP VF ULDIST LN 8LFCSP |
| 產(chǎn)品培訓(xùn)模塊： | Practical Guide High Speed PCB Layout |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類(lèi)型： | 電壓反饋 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 1350 V/µs |
| -3db帶寬： | 1GHz |
| 電流 - 輸入偏壓： | 2µA |
| 電壓 - 輸入偏移： | 200µV |
| 電流 - 電源： | 16mA |
| 電流 - 輸出 / 通道： | 70mA |
| 電壓 - 電源，單路/雙路(±)： | 3.3 V ~ 12 V，±1.65 V ~ 6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 8-VFDFN 裸露焊盤(pán)，CSP |
| 供應(yīng)商設(shè)備封裝： | 8-LFCSP-VD（3x3） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁(yè)面： | 769 (CN2011-ZH PDF) |
| 其它名稱(chēng)： | AD8045ACPZ-REEL7DKR |
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AD8045
Rev. A | Page 19 of 24
APPLICATIONS
LOW DISTORTION PINOUT
The AD8045 LFCSP package features Analog Devices new low
distortion pinout. The new pinout provides two advantages
over the traditional pinout. First, improved second harmonic
distortion performance, which is accomplished by the physical
separation of the noninverting input pin and the negative power
supply pin. Second, the simplification of the layout due to the
dedicated feedback pin and easy routing of the gain set resistor
back to the inverting input pin. This allows a compact layout,
which helps to minimize parasitics and increase stability.
The traditional SOIC pinout has been slightly modified as well
to incorporate a dedicated feedback pin. Pin 1, previously a no
connect pin on the amplifier, is now a dedicated feedback pin. The
new pinout reduces parasitics and simplifies the board layout.
Existing applications that use the traditional SOIC pinout can
take full advantage of the outstanding performance offered by
the AD8045. An electrical insulator may be required if the SOIC
rests on the ground plane or other metal trace. This is covered
in more detail in the Exposed Paddle section of this data sheet.
In existing designs, which have Pin 1 tied to ground or to
another potential, simply lift Pin 1 of the AD8045 or remove the
potential on the Pin 1 solder pad. The designer does not need to
use the dedicated feedback pin to provide feedback for the
AD8045. The output pin of the AD8045 can still be used to pro-
vide feedback to the inverting input of the AD8045.
HIGH SPEED ADC DRIVER
When used as an ADC driver, the AD8045 offers results compa-
rable to transformers in distortion performance. Many ADC
applications require that the analog input signal be dc-coupled
and operate over a wide frequency range. Under these require-
ments, operational amplifiers are very effective interfaces to
ADCs. An op amp interface provides the ability to amplify and
level shift the input signal to be compatible with the input range
of the ADC. Unlike transformers, operational amplifiers can be
operated over a wide frequency range down to and including dc.
Figure 67 shows the AD8045 as a dc-coupled differential driver
for the AD9244, a 14-bit 65 MSPS ADC. The two amplifiers are
configured in noninverting and inverting modes. Both amplifi-
ers are set with a noise gain of +2 to provide better bandwidth
matching. The inverting amplifier is set for a gain of –1, while
the noninverting is set for a gain of +2. The noninverting input
is divided by 2 in order to normalize its output and make it
equal to the inverting output.
This dc-coupled differential driver is best suited for ±5 V
operation in which optimum distortion performance is required
and the input signal is ground referenced.
VINA
VINB
CML
AD9244
511
511
511
511
511
511
VIN
VCML – VIN
AD8045
0.1
F
20pF
1
F
0.1
F
OP27
511
511
VCML + VIN
33
33
2.5k
100
04814-0-066
Figure 67. High Speed ADC Driver
The outputs of the AD8045s are centered about the AD9244’s
common-mode range of 2.5 V. The common-mode reference
voltage from the AD9244 is buffered and filtered via the OP27
and fed to the noninverting resistor network used in the level
shifting circuit.
The spurious-free dynamic range (SFDR) performance is
shown in Figure 68. Figure 69 shows a 50 MHz single-tone FFT
performance.
04814-0-067
INPUT FREQUENCY (MHz)
100
110
S
F
DR
(dBc
)
120
100
80
60
40
20
0
AD8045
Figure 68. SFDR vs. Frequency
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8045AR | 制造商:Analog Devices 功能描述:ULTRA-LOW DISTORTION HIGH SPEED AMPLIFIER - Bulk |
| AD8045ARD | 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk 制造商:Analog Devices 功能描述:IC OP-AMP HIGH SPEED |
| AD8045ARD-EBZ | 功能描述:BOARD EVAL FOR AD8045ARD RoHS:是 類(lèi)別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 運(yùn)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:- |
| AD8045ARD-REEL | 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk 制造商:Analog Devices 功能描述:OP AMP SGL VOLT FDBK 6V/12V 8SOIC N EP - Tape and Reel |
| AD8045ARD-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Single Volt Fdbk |
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