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ADL5303ACPZ-R7 Arkusz danych(PDF) 14 Page - Analog Devices

Numer części ADL5303ACPZ-R7
Szczegółowy opis  160 dB Range 100 pA to 10 mA Low Cost Logarithmic Converter
PDF  24 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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ADL5303ACPZ-R7 Arkusz danych(HTML) 14 Page - Analog Devices

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ADL5303
Data Sheet
Rev. 0 | Page 14 of 24
Generally, it is useful to raise the intercept. Keep in mind that
this moves the VLOG line in Figure 26 to the right, lowering all
output values. Figure 27 shows how raising the intercept is
achieved. The feedback resistors, RA and RB, around the buffer
are now augmented with a third resistor, RZ, placed between the
BFNG and VREF pins. Adding a third resistor raises the zero-
signal voltage on BFNG, which has the effect of pushing VOUT
lower. Note that the addition of the RZ resistor also alters the
feedback ratio. However, this change in feedback ratio is readily
compensated in the design of the network. Table 6 lists the
resistor values for representative intercepts.
Table 6. Examples of Raising the Intercept
VY (mV/decade)
IZ (nA)
RA (kΩ)
RB (kΩ)
RC (kΩ)
300
10
7.5
37.4
24.9
300
100
8.25
130
18.2
400
10
10
16.5
25.5
400
100
9.76
25.5
16.2
400
500
9.76
36.5
13.3
500
10
12.4
12.4
24.9
500
100
12.4
16.5
16.5
500
500
11.5
20.0
12.4
Use the following equation with Table 6:
+
×
=


×
=
C
B
A
B
A
REF
Z
PD
Y
OUT
R
R
R
R
R
V
I
I
V
G
V
10
log
(10)
where
.
and
1
B
A
B
A
B
A
C
B
A
R
R
R
R
R
R
R
R
R
G
×
×
=
+
=
NC
VOUT
500mV/DEC
R15
(RA)
R18
(RB)
NC = NO CONNECT
VP
100nF
R1
750
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
R13
(RC)
Figure 27. Method for Raising the Intercept



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