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ML2009IP 数据表(PDF) 6 Page - Micro Linear Corporation

部件名 ML2009IP
功能描述  關P Compatible Logarithmic Gain/Attenuator
Download  11 Pages
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制造商  MICRO-LINEAR [Micro Linear Corporation]
网页  http://www.microlinear.com
标志 MICRO-LINEAR - Micro Linear Corporation

ML2009IP 数据表(HTML) 6 Page - Micro Linear Corporation

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ML2008, ML2009
6
TYPICAL PERFORMANCE CURVES (Continued)
0.1
.08
.06
.04
.02
0
–.02
–.04
–.06
–.08
–1.0
–24
GAIN SETTING (dB)
–18
–12
–6
0
6
12
18
24
80
70
60
50
40
30
20
10
–24
GAIN SETTING (dB)
–18
–12
–6
0
6
12
18
24
VIN = 1kHz
VIN = 20kHz
VIN = 50kHz
ATTEN: VIN = 2VRMS
GAIN: VIN = 2VRMS/GAIN SETTING
80
70
60
50
40
30
20
GAIN SETTING (dB)
0
6
12
18
24
VIN = 50kHz
VIN = 20kHz
VIN = 1kHz
–24
–18
–12
–6
ATTEN: VIN = 0.5VRMS
GAIN: VIN = 0.5VRMS/GAIN SETTING
Figure 7. Gain Error vs Gain Setting
Figure 8. S/N +D vs Gain Setting (VIN/VOUT = 2VRMS)
Figure 9. S/N +D vs Gain Setting (VIN/VOUT = 0.5VRMS)
Figure 6. CMSG S/N vs Gain Setting
GAIN SETTING (dB)
0
6
12
18
24
100
90
80
70
60
50
40
ATTEN: VIN = 8dBm
GAIN: VIN = 8dBm/GAIN SETTING
1kHZ
–6
–12
–18
–24
1.0 FUNCTIONAL DESCRIPTION
The ML2008, ML2009 consists of a coarse gain stage, a
fine gain stage, an output buffer, and a
µP compatible
parallel digital interface.
1.1 Gain Stages
The analog input, VIN, goes directly into the op amp input
in the coarse gain stage. The coarse gain stage has a gain
range of 0 to 22.5dB in 1.5dB steps.
The fine gain stage is cascaded onto the coarse section.
The fine gain stage has a gain range of 0 to 1.5dB in 0.1dB
steps.
Both stages can be programmed for either gain or
attenuation, thus doubling the effective gain range.
The logarithmic steps in each gains stage are generated by
placing the input signal across a resistor string of 16 series
resistors. Analog switches allow the voltage to be tapped
from the resistor string at 16 points. The resistors are sized
such that each output voltage is at the proper logarithmic
ratio relative to the input signal at the top of the string.
Attenuation is implemented by using the resistor string as
a simple voltage divider, and gain is implemented by
using the resistor string as a feedback resistor around an
internal op amp.
1.2 Gain Settings
Since the coarse and fine gain stages are cascaded, their
gains can be summed logarithmically. Thus, any gain from
–24dB to +24dB in 0.1dB steps can be obtained by
combining the coarse and fine gain setting to yield the


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