参数资料
| 型号： | AD8304ARU |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC LOGARITHM CONV 160DB 14-TSSOP |
| 设计资源： | Interfacing ADL5315 to Translinear Logarithmic Amplifier (CN0056) Interfacing ADL5317 High Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector |
| 标准包装： | 1 |
| 类型： | 对数转换器 |
| 应用： | 光纤 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 管件 |
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
相关PDF资料 |
PDF描述 |
|---|---|
| AD8305ACPZ-R2 | IC AMP LOG CONV 100DB 16-LFCSP |
| AD8306AR | IC LOGARITHM AMP 5-400MHZ 16SOIC |
| AD8307AN | IC LOGARITHMIC AMP 8-DIP |
| AD8309ARU | IC LOGARITHM AMP 100DB 16-TSSOP |
| AD830ANZ | IC VIDEO DIFF AMP HS 8-DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8304ARU-REEL | 制造商:Analog Devices 功能描述:SP Amp LOG Amp Single R-R O/P 5.5V 14-Pin TSSOP T/R 制造商:Analog Devices 功能描述:SP AMP LOG AMP SGL R-R O/P 5.5V 14TSSOP - Tape and Reel |
| AD8304ARU-REEL7 | 功能描述:IC LOGARITHMIC CONV 14-TSSOP T/R RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| AD8304ARUZ | 功能描述:IC LOGARITHM CONV 160DB 14-TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| AD8304ARUZ | 制造商:Analog Devices 功能描述:Logarithmic Amplifier IC |
| AD8304ARUZ-RL7 | 功能描述:IC LOGARITHM CONV 160DB 14-TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
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