參數(shù)資料
型號(hào)： AD8304ARU-REEL7
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 0K
描述： IC LOGARITHMIC CONV 14-TSSOP T/R
設(shè)計(jì)資源： Interfacing ADL5315 to Translinear Logarithmic Amplifier (CN0056)
Interfacing ADL5317 High Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector
標(biāo)準(zhǔn)包裝： 1,000
類(lèi)型： 對(duì)數(shù)轉(zhuǎn)換器
應(yīng)用： 光纖
安裝類(lèi)型： 表面貼裝
封裝/外殼： 14-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 14-TSSOP
包裝： 帶卷 (TR)
REV. A
–14–
AD8304
ACOM Pin, and does not normally go negative with regard to this
pin, but is free to do so. Therefore, a resistor from VLOG to the
negative supply can lower VLOG, thus raising the intercept. A more
accurate method for repositioning the intercept is described below.
INPUT – A
100p
10m
1n
10n
100n
1
10
100
1m
2.0
–2.0
ERR
OR
–
dB
(10mV/dB)
1.5
0
–0.5
–1.0
–1.5
1.0
0.5
WITHOUT INTERCEPT ADJUST
WITH INTERCEPT ADJUST
VNEG = 0
VNEG = –0.5
VNEG = –3
Figure 11. Log Conformance (Linearity) vs. IPD for
Various Negative Supplies
APPLICATIONS
The AD8304 incorporates features that improve its usefulness in
both fiber optic supervisory applications and in more general ones.
To aid in the exploration of these possibilities, a SPICE macro-
model is provided and a versatile evaluation board is available.
The macromodel is shown in generalized schematic form (and thus
is independent of variations in SPICE programs) in Figure 12.
Q1, QM, and Q2 (here made equal in size) correspond to the
identical transistors in Figure 1. The model parameters for these
transistors are not critical; the default model provided in SPICE
libraries will be satisfactory. However, the AD8304 employs
compensation techniques to reduce errors caused by junction
resistances (notably, RB and RE) at high input currents. There-
fore, it is advisable to set these to zero. While this will not model
the AD8304 precisely, it is safer than using possibly high default
values for these parameters. The low current model parameters
may also need consideration. Note that no attempt is made to
capture either dynamic behavior or the effects of temperature in this
simple macromodel; scaling is correct for 27
°C.
V
E4
V2
R1
R2
VLOG
7
5
C2
V
V1
+
Q3
I1
IPD
IN
1
2
3
4
I1
I2
E3
E2
C1
6
RL
I1
C1
E1
V1
Q1
I2
Q2
I3
Q3
.MODEL
E2
E3
E4
V2
R1
C2
R2
RL
0
IN
2
1
IN
0
3
0
4
NPN
5
6
7
8
9
VLOG
IN
0
2
3
4
NPN
0
7
9
0
VLOG
0
DC
1.0N
IN
0.5
0
1
0
316.2
0
POLY (2)
6
5
100K
0.8
100
163P
4.9K
1000K
1 A
1
NPN
2 3 1 0 0, 0, 0, 0, 1
4 3 7 0 0, 0, 0, 0, 1
3K
Q2
Q1
100k
3k
+
Figure 12. Basic Macromodel
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