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ADL5304ACPZ-R2 数据表(PDF) 20 Page - Analog Devices

部件名 ADL5304ACPZ-R2
功能描述  High Speed, 200 dB Range, Logarithmic Converter
PDF  32 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADL5304ACPZ-R2 数据表(HTML) 20 Page - Analog Devices

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ADL5304
Data Sheet
Rev. A | Page 20 of 32
R&S FSEA30
SPECTRUM ANALYZER
INPUT
COAX SHIELD BIASED TO
VLOG DC LEVEL
20MHz TO
3.5GHz
ADL5304
2
30
3
4
5
6
8
7
MONITOR AND
PD BIAS
(1.1× INUM)
TEMPERATURE
COMPENSATION
1.5V
1.5V
32
31
26
9
IMON
VNUM
INNM
VDEN
HFCP
COMM NMFS VNEG DNFS
VNEG
INDN
1P5V
2VLT
DCBI
BSDC
VSM1
VSM2
VSM3
IREF
IDEN
INUM
VSM4
10
11
27
29
28
100nA
1.5V
17
24
2V
BIAS AND
VREF
12
13
14
ACOM
15
16
INPS
INMS
VLOG
23
22
5kΩ
5kΩ
1kΩ
1kΩ
7.5kΩ
21
20
19
18
SCL1
SCL2
SCL3
ACOM
VPOS
VNUM
VDEN
ILOG
0.1µF
0.1µF
SHIELD
BIAS
COAX SHIELD
BROKEN
DUT 5V
10kΩ LINEAR 15 TURN
4kΩ METAL FILM
AD8597
BUFFER +9V
BUFFER –9V
1MΩ log
CONDUCTIVE PLASTIC
DUT 5V
SHIELDED ENCLOSURE
DUT 5V
BUFFER +9V
+
9V
–
BUFFER –9V
–
9V
+
+
9V
–
7805
SHIELD BIAS
1kΩ LINEAR 15 TURN
Figure 47. Setup for Measuring Noise for INUM = 100 pA, INUM = 1 nA, and INUM = 10 nA
Filtering to Improve Noise and Dynamic Behavior
The noise at the output of a log amp, particularly at low current
levels, leads to uncertainty in the measurement. Noise amplitude
is limited by the finite bandwidth.
If measurement speed is not of primary concern, additional
filtering can reduce noise. Figure 48 shows the recommended
locations for additional external filtering. Note the ADL5304
consists of a current-to-voltage (transimpedance) conversion
(INUM or IDEN to VNUM − VDEN), followed by a voltage-to-current
conversion (VNUM − VDEN to ILOG), and then followed by another
current-to-voltage conversion (ILOG to VLOG).
Typically, capacitors are not used on the numerator side (INUM)
to keep the speed of the device as high as possible. On the
denominator side (IDEN), additional filtering is useful to reduce
noise. In applications where INUM is used as the reference to the
logarithmic equation and IDEN is a variable, for example, where a
reverse logarithmic slope is desired, filtering can be done on the
numerator side (INUM).
2
3
4
5
6
8
7
MONITOR AND
PD BIAS
(1.1× INUM)
1.5V
1.5V
32
31
26
9
VNUM
INNM
VDEN
INDN
1P5V
DCBI
VSM1
VSM2
VSM3
IREF
IDEN
INUM
VSM4
C1D
C1N
10
27
100nA
1.5V
24
BIAS
INPS
INMS
VLOG
23
22
5kΩ
5kΩ
7.5kΩ
21
20
19
18
SCL1
SCL2
SCL3
ACOM
VNUM
VDEN
C2D
C3D
C2N
C3N
CFB
RN
ILOG
RD
Figure 48. Possible External Filtering Locations



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