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ADA4927-1 PDF预览

ADA4927-1

更新时间: 2024-10-28 06:36:15
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亚德诺 - ADI 驱动器
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24页 840K
描述
Ultralow Distortion Current Feedback Differential ADC Driver

ADA4927-1 数据手册

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Ultralow Distortion  
Current Feedback Differential ADC Driver  
ADA4927-1/ADA4927-2  
FUNCTIONAL BLOCK DIAGRAMS  
FEATURES  
Extremely low harmonic distortion  
−105 dBc HD2 @ 10 MHz  
−91 dBc HD2 @ 70 MHz  
−87 dBc HD2 @ 100 MHz  
−103 dBc HD3 @ 10 MHz  
−98 dBc HD3 @ 70 MHz  
ADA4927-1  
12 PD  
–FB  
+IN  
–IN  
1
2
3
4
11 –OUT  
10 +OUT  
+FB  
9 V  
OCM  
−89 dBc HD3 @ 100 MHz  
Better distortion at higher gains than VF amplifiers  
Low input voltage noise: 1.4 nV/√Hz  
High speed  
Figure 1.  
−3 dB bandwidth of 2.3 GHz  
0.1 dB gain flatness: 150 MHz  
Slew rate: 5000 V/μs, 25% to 75%  
Fast 0.1% settling time: 10 ns  
Low input offset voltage: 0.3 mV typical  
Externally adjustable gain  
Stability and bandwidth controlled by feedback resistor  
Differential-to-differential or single-ended-to-differential  
operation  
–IN1  
+FB1  
1
18 +OUT1  
17 V  
2
3
4
5
6
OCM1  
16 –V  
+V  
S2  
S2  
S1  
ADA4927-2  
–V  
15  
14  
+V  
S1  
–FB2  
+IN2  
PD2  
13 –OUT2  
Adjustable output common-mode voltage  
Wide supply operation: +5 V to 5 V  
Figure 2.  
APPLICATIONS  
–40  
–50  
–60  
–70  
–80  
ADC drivers  
V
,
= 2V p-p  
OUT dm  
Single-ended-to-differential converters  
IF and baseband gain blocks  
Differential buffers  
Differential line drivers  
GENERAL DESCRIPTION  
–90  
–100  
–110  
–120  
–130  
The ADA4927 is a low noise, ultralow distortion, high speed,  
current feedback differential amplifier that is an ideal choice for  
driving high performance ADCs with resolutions up to 16 bits  
from dc to 100 MHz. The output common-mode level can easily be  
matched to the required ADC input common-mode levels. The  
internal common-mode feedback loop provides exceptional output  
balance and suppression of even-order distortion products.  
G = 1  
G = 10  
G = 20  
1
10  
100  
1k  
FREQUENCY (MHz)  
Figure 3. Spurious-Free Dynamic Range vs. Frequency at Various Gains  
Differential gain configurations are easily realized using an  
external feedback network comprising four resistors. The  
current feedback architecture provides loop gain that is nearly  
independent of closed-loop gain, achieving wide bandwidth,  
low distortion, and low noise at higher gains and lower power  
consumption than comparable voltage feedback amplifiers.  
The low dc offset and excellent dynamic performance of the  
ADA4927 make it well suited for a wide variety of data acquisition  
and signal processing applications.  
The ADA4927-1 is available in a Pb-free, 3 mm × 3 mm 16-lead  
LFCSP, and the ADA4927-2 is available in a Pb-free, 4 mm × 4 mm  
24-lead LFCSP. The pinouts are optimized to facilitate printed  
circuit board (PCB) layout and to minimize distortion. They are  
specified to operate over the −40°C to +105°C temperature range.  
The ADA4927 is fabricated using the Analog Devices, Inc., silicon-  
germanium complementary bipolar process, enabling very low  
levels of distortion with an input voltage noise of only 1.3 nV/√Hz.  
Rev. 0  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2008 Analog Devices, Inc. All rights reserved.  
 

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