AD600ARZ1 PDF预览

AD600ARZ1

更新时间: 2025-07-21 03:17:47
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亚德诺 - ADI 放大器
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28页 593K
描述
Dual, Low Noise, Wideband Variable Gain Amplifiers

AD600ARZ1 数据手册

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Dual, Low Noise, Wideband  
Variable Gain Amplifiers  
AD600/AD602  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
GAT1  
2 channels with independent gain control  
Linear in dB gain response  
2 gain ranges  
PRECISION PASSIVE  
INPUT ATTENUATOR  
SCALING  
REFERENCE  
GATING  
INTERFACE  
C1HI  
AD600: 0 dB to 40 dB  
V
A1OP  
A1CM  
G
AD602: –10 dB to +30 dB  
Accurate absolute gain: 0.3 dB  
Low input noise: 1.4 nV/√Hz  
Low distortion: −60 dBc THD at 1 V output  
High bandwidth: dc to 35 MHz (−3 dB)  
Stable group delay: 2 ns  
Low power: 125 mW (maximum) per amplifier  
Signal gating function for each amplifier  
Drives high speed ADCs  
C1LO  
GAIN CONTROL  
INTERFACE  
RF2  
2.24k(AD600)  
694(AD602)  
0dB  
–12.04dB  
–18.06dB  
–22.08dB  
–36.12dB  
–42.14dB  
RF1  
20Ω  
–6.02dB  
–30.1dB  
A1HI  
FIXED-GAIN  
AMPLIFIER  
41.07dB (AD600)  
31.07dB (AD602)  
A1LO  
500Ω  
62.5Ω  
R-2R LADDER NETWORK  
Figure 1.  
The gain-control interfaces are fully differential, providing an  
input resistance of ~15 MΩ and a scale factor of 32 dB/V (that  
is, 31.25 mV/dB) defined by an internal voltage reference. The  
response time of this interface is less than 1 μs. Each channel  
also has an independent gating facility that optionally blocks  
signal transmission and sets the dc output level to within a few  
millivolts of the output ground. The gating control input is  
TTL- and CMOS-compatible.  
MIL-STD-883-compliant and DESC versions available  
APPLICATIONS  
Ultrasound and sonar time-gain controls  
High performance audio and RF AGC systems  
Signal measurement  
GENERAL DESCRIPTION  
The maximum gain of the AD600 is 41.07 dB, and the  
maximum gain of the AD602 is 31.07 dB; the −3 dB bandwidth  
of both models is nominally 35 MHz, essentially independent of  
the gain. The SNR for a 1 V rms output and a 1 MHz noise  
bandwidth is typically 76 dB for the AD600 and 86 dB for the  
AD602. The amplitude response is flat within 0.5 dB from  
100 kHz to 10 MHz; over this frequency range, the group delay  
varies by less than 2 ns at all gain settings.  
The AD600/AD6021 dual channel, low noise, variable gain  
amplifiers are optimized for use in ultrasound imaging systems  
but are applicable to any application requiring precise gain, low  
noise and distortion, and wide bandwidth. Each independent  
channel provides a gain of 0 dB to +40 dB in the AD600 and  
−10 dB to +30 dB in the AD602. The lower gain of the AD602  
results in an improved signal-to-noise ratio (SNR) at the output.  
However, both products have the same 1.4 nV/√Hz input noise  
spectral density. The decibel gain is directly proportional to the  
control voltage, accurately calibrated, and supply and  
temperature stable.  
Each amplifier channel can drive 100 Ω load impedances with  
low distortion. For example, the peak specified output is 2.5 V  
minimum into a 500 Ω load or 1 V into a 100 Ω load. For a  
200 Ω load in shunt with 5 pF, the total harmonic distortion for  
To achieve the difficult performance objectives, a proprietary  
circuit form, the X-AMP®, was developed. Each channel of the  
X-AMP comprises a variable attenuator of 0 dB to −42.14 dB  
followed by a high speed fixed gain amplifier. In this way, the  
amplifier never has to cope with large inputs and can benefit  
from the use of negative feedback to precisely define the gain  
and dynamics. The attenuator is realized as a 7-stage R-2R  
ladder network having an input resistance of 100 Ω, laser  
trimmed to 2ꢀ. The attenuation between tap points is 6.02 dB;  
the gain-control circuit provides continuous interpolation between  
these taps. The resulting control function is linear in dB.  
a
1 V sinusoidal output at 10 MHz is typically −60 dBc.  
The AD600J/AD602J are specified for operation from 0°C to 70°C  
and are available in 16-lead PDIP (N) and 16-lead SOIC_W  
packages. The AD600A/AD602A are specified for operation from  
−40°C to +85°C and are available in 16-lead CERDIP (Q) and  
16-lead SOIC_W packages. The AD600S/ AD602S are specified  
for operation from −55°C to +125°C, are available in a 16-lead  
CERDIP (Q) package, and are MIL-STD-883-compliant. The  
AD600S/AD602S are also available under DESC SMD 5962-94572.  
1 Patented.  
Rev. E  
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  
©2006 Analog Devices, Inc. All rights reserved.  
 

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