参数资料
| 型号： | ADL5304ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/32页 |
| 文件大小： | 0K |
| 描述： | IC AMP LOG CONV 32LFCSP |
| 标准包装： | 5,000 |
| 类型： | 对数转换器 |
| 应用： | 光纤 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 32-LFCSP-VQ（5x5） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
ADL5304
Data Sheet
Rev. 0 | Page 16 of 32
TERMINOLOGY
In the case of dual-supply operation of the device, the intercept
can be shifted to different values depending on where the VSM1 to
VSM4, DCBI, and INPS pins are biased; the only recommended
values are either 1.5 V via connection to the 1P5V pin, as in the case
of single-supply operation, or ground when a dual supply is used.
Optical Power
Optical power is defined as photon energy per unit of time
measured as radiant flux (Φ) or radiant power, which is radiant
energy (Q) per unit time.
Photodiode Responsivity
Photodiode (PD) responsivity, ρ, is a constant that correlates
optical power (POPT) with PD current (IPD).
IPD = ρ × POPT
(1)
For example, if connected to ground, then the intercept is at IZ =
IDEN = INUM for which log(INUM/IDEN) = 0. This is how most people
interpret the function log(x).
The most practical way to define intercept is to simply always use
log10(INUM/IDEN) = 0 as the reference point. The only consequence is
that a VOFS needs to be introduced depending on how the output
buffer gain and offset is set up.
where typical values for ρ of InGaAs p-intrinsic-n (PIN) photo-
diodes are in the range of 0.6 A/W to 1 A/W. In the case of 1 A/W,
this means that for 1 mW of incident optical power, POPT, the
PD delivers 1 mA of current, IPD.
OFS
DEN
NUM
Y
LOG
V
I
V
+
×
=
10
log
(3)
When the photodiode current input to the ADL5304 is divided
by the responsivity, the log slope directly represents the change
in input optical power, POPT.
0.2 V/decade and VOFS = 1.5 V (derived from the 1P5V pin),
and IDEN is supplied by the on-chip trimmed IREF = 100 nA.
Dark Current
All reverse-biased diodes develop a current due to the random
generation of electrons/holes in the depletion region. In photo-
diodes, this current occurs with no incident light falling on the
diode and is called the dark current, IDK. Dark current limits the
minimum signal that can be reliably detected. For high speed
InGaAs PIN photodiodes, the IDK is typically around 5 nA. For
a photodiode with a responsivity of 1 A/W, a 5 nA IDK limits
minimum measureable optical power to 53 dBm.
The relationship between IZ and VOFS is as follows:
=
0.2V/dec
1.5V
10
nA
100
10
5
1
Y
V
P
Y
OFS
V
REF
V
DEN
Z
I
(4)
Logarithmic Function
The logarithmic function is
×
=
Z
NUM
Y
LOG
I
V
10
log
(2)
Because IREF and VY are trimmed for the default setup with VOFS =
1.500 V, IZ should also be a stable quantity; however, because it is a
calculated value determined by the IREF, V1P5V, and VY parameters,
its distribution is the combination of the three parameters and
wider than the original parameters.
The ideal single- and dual-supply ADL5304 responses are
shown in Figure 44.
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–1.0
–0.8
V
LO
G
O
UT
P
UT
V
O
L
T
AG
E
(V
)
1p
10p 100p
1n
10n 100n
1
10 100
1m
10m
INUM INPUT CURRENT (A)
09
45
9
-05
4
INUM = IDEN
SINGLE SUPPLY VSUM = 1.5V
DUAL SUPPLY VSUM = 0V
200mV/DEC
INUM = IDEN
Logarithmic Slope
Logarithmic slope is the change in output voltage (VLOG) for a
given change in input current usually shown as a semi-log
graph where one input current (INUM or IDEN) is plotted on a log
scale, and the output voltage (VLOG) is plotted on a linear scale.
The other input current is fixed. Typically, slope is denoted as
the default configuration, VY = 200 mV/decade (10 mV/dB).
Logarithmic Intercept
Logarithmic intercept, IZ, is an extrapolated value representing
the input current where VLOG = 0 V. In single-supply operation
(the VSMx pins = DCBI = INPS = 1P5V), VLOG is always
positive, and when the ADL5304 is operating in the default
configuration of IDEN = IREF = 100 nA, the logarithmic intercept
occurs at INUM = 3.162 fA.
Figure 44. Ideal Transfer Function
相关PDF资料 |
PDF描述 |
|---|---|
| ADL5310ACP-R2 | IC LOGARITHMIC CONV DUAL 24LFCSP |
| ADN3000-06-50A-PT | IC AMP TRANSIMPEDANCE DIEFORM |
| ADN4670BSTZ | IC CLOCK BUFFER MUX 2:10 32LQFP |
| ADS7864YB/250G4 | IC 12BIT 500KHZ 6CH ADC 48-TQFP |
| ADS7883SBDBVR | IC ADC 12-BIT 3MSPS SOT23-6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADL5304-EVALZ | 功能描述:BOARD EVAL FOR ADL5304A RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:* 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
| ADL5305ACP-REEL | 制造商:Analog Devices 功能描述:LOGARITHMIC CONVERTER - Tape and Reel |
| ADL5306 | 制造商:AD 制造商全称:Analog Devices 功能描述:60 dB Range (100 nA to 100 UA) Low Cost Logarithmic Converter |
| ADL5306ACP | 制造商:AD 制造商全称:Analog Devices 功能描述:60 dB Range (100 nA to 100 UA) Low Cost Logarithmic Converter |
| ADL5306ACP-R2 | 功能描述:IC CONVERT LOGARITH 60DB 16LFCSP 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 |
发布紧急采购，3分钟左右您将得到回复。