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參數(shù)資料
| 型號： | ADA4927-1YCPZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP CF DIFF 65MA LN 16LFCSP |
| 特色產(chǎn)品： | ADA4927: Ultralow Distortion Current Feedback Differential ADC Driver |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 1 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 5000 V/µs |
| -3db帶寬： | 2.3GHz |
| 電流 - 輸入偏壓： | 500nA |
| 電壓 - 輸入偏移： | 300µV |
| 電流 - 電源： | 20mA |
| 電流 - 輸出 / 通道： | 65mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 11 V，±2.25 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 16-LFCSP-VQ |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 765 (CN2011-ZH PDF) |
| 其它名稱： | ADA4927-1YCPZ-R7DKR |
ADA4927-1/ADA4927-2
Rev. A | Page 23 of 24
HIGH PERFORMANCE ADC DRIVING
The ADA4927 is ideally suited for high gain, broadband ac-
coupled and differential-to-differential applications on a single
supply, though other applications are possible. Compared with
voltage feedback amplifiers, the current feedback architecture
provides superior distortion and bandwidth performance at
high gains. This is because the ideal current feedback amplifier
loop gain depends only on the feedback value and open-loop
transimpedance, T(s).
The circuit in Figure 58 shows a front-end connection for an
ADA4927 driving an AD9445, 14-bit, 105 MSPS ADC, with ac
coupling on the ADA4927 input and output. (The AD9445
achieves its optimum performance when driven differentially.)
The ADA4927 eliminates the need for a transformer to drive
the ADC and performs a single-ended-to-differential conversion
and buffering of the driving signal.
The ADA4927 is configured with a single 5 V supply and gain
of 10 for a single-ended input to differential output. The 158 Ω
termination resistor, in parallel with the single-ended input
impedance of approximately 73.2 Ω, provides a 50 Ω termination
for the source. The additional 38.3 Ω at the inverting input closely
matches the parallel impedance of the 50 Ω source and the
termination resistor driving the noninverting input. Because of the
high gain, a few iterations of the termination technique described
in the Terminating a Single-Ended Input section are required.
Two objectives of the design are to make RF close to 500 Ω and
obtain resistor values that are close to standard 1% values.
In this example, the signal generator has a 1 V p-p symmetric,
ground-referenced bipolar output when terminated in 50 Ω.
The VOCM pin of the ADA4927 is bypassed for noise reduction
and left floating such that the internal divider sets the output
common-mode voltage nominally at midsupply. Because the
inputs are ac-coupled, no dc common-mode current flows in
the feedback loops, and a nominal dc level of midsupply is
present at the amplifier input terminals. Besides placing the
amplifier inputs at their optimum levels, the ac coupling technique
lightens the load on the amplifier and dissipates less power than
applications with dc-coupled inputs.
The output of the amplifier is ac-coupled to the ADC through a
second-order, low-pass filter with a cutoff frequency of 100 MHz.
This reduces the noise bandwidth of the amplifier and isolates
the driver outputs from the ADC inputs.
The AD9445 is configured for a 2 V p-p full-scale input by
connecting the SENSE pin to AGND, as shown in Figure 58.
VIN–
VIN+
47pF
30nH
24.3
50
SIGNAL
GENERATOR
39.2
VOCM
5V
ADA4927
+
158
511
38.3
511
14
BUFFER T/H
ADC
CLOCK/
TIMING
REF
SENSE
AGND
0.1F
AD9445
3.3V (A)
AVDD1
5V (A)
AVDD2
3.3V (D)
DRVDD
07
57
4-
05
8
Figure 58. ADA4927 Driving an AD9445 ADC with AC-Coupled Input and Output
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| ADA4927-1YCPZ-RL | 功能描述:IC OPAMP CF DIFF 65MA LN 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| ADA4927-2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultralow Distortion Current Feedback Differential ADC Driver |
| ADA4927-2YCP-EBZ | 功能描述:BOARD EVAL FOR ADA4927-2YCP RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 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:- |
| ADA4927-2YCPZ-R2 | 功能描述:IC OPAMP CF DIFF DUAL LN 24LFCSP RoHS:是 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) |
| ADA4927-2YCPZ-R7 | 功能描述:IC OPAMP CF DIFF DUAL LN 24LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°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-SOIC 包裝:帶卷 (TR) |
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