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ADL5303ACPZ-R7 数据表(PDF) 13 Page - Analog Devices

部件名 ADL5303ACPZ-R7
功能描述  160 dB Range 100 pA to 10 mA Low Cost Logarithmic Converter
PDF  24 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

ADL5303ACPZ-R7 数据表(HTML) 13 Page - Analog Devices

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Data Sheet
ADL5303
Rev. 0 | Page 13 of 24
A wide range of gains may be used and the resistor magnitudes
are not critical; their parallel sum should be about equal to
the net source resistance at the noninverting input. When
high gains are used, the output dynamic range is reduced; for
a maximum swing of 4.8 V, it amounts to 4.8 V/VY decades.
Thus, using a ratio of 3×, to set up a slope 30 mV/dB (600 mV/
decade), eight decades can be handled, whereas with a ratio
of 5×, which sets up a slope of 50 mV/dB (1 V/decade), the
dynamic range is 4.8 decades, or 96 dB. When using a lower
supply voltage, the calculation proceeds in the same way,
remembering to first subtract 0.2 V to allow for 0.1 V upper
and lower headroom in the output swing.
Alteration of the logarithmic intercept is only slightly more
tricky. First, note that it is rarely necessary to lower the intercept
below a value of 100 pA, because this merely raises all output
voltages further above ground. However, where this is required,
the first step is to raise the voltage, VLOG, by connecting a
resistor, RZ, from VLOG to VREF (2 V) as shown in Figure 26.
This has the effect of elevating, VLOG, for small inputs while
lowering the slope to some extent because of the shunt effect
of RZ on the 5 kΩ output resistance. If necessary, the slope may
be increased as before, using a feedback attenuator around the
buffer. Table 5 lists some examples of lowering the intercept
combined with several slope variations.
Table 5. Examples of Lowering the Intercept
VY (mV/decade)
IZ (pA)
RA (kΩ)
RB (kΩ)
RZ (kΩ)
200
1
20.0
100
25
200
10
10.0
100
50
200
50
3.01
100
165
300
1
10.0
12.4
25
300
10
8.06
12.4
50
300
50
6.65
12.4
165
400
1
11.5
8.2
25
400
10
9.76
8.2
50
400
50
8.66
8.2
165
500
1
16.5
8.2
25
500
10
14.3
8.2
50
500
50
13.0
8.2
165
Use the following equation with Table 5:
+
×
+


×
+
×
=
Z
LOG
LOG
REF
Z
PD
LOG
Z
Z
Y
OUT
R
R
R
V
I
I
R
R
R
V
G
V
10
log
(9)
where G = 1 + RA/RB and RLOG = 5 kΩ.
NC
VOUT
500mV/DEC
R18 (RB)
R14 (RZ)
R15 (RA)
NC = NO CONNECT
VP
100nF
R1
750
Ω
C1
1nF
IPD
C3
PDB
BIAS
VREF
VPDB
VSUM
INPT
VSUM
ACOM
VPS2
PWDN
VPS1
VREF
VLOG
BFIN
BFNG
VOUT
0.5V
ADL5303
~10k
Ω
5k
Ω
5
2
3
4
15
14
GND
GND
7
11
10
16
12
6
8
9
13
TEMPERATURE
COMPENSATION
Figure 26. Method for Lowering the Intercept



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