參數(shù)資料
型號(hào)： ADL5304ACPZ-R7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 1/32頁(yè)
文件大?。?/td> 0K
描述： IC AMP LOG CONV 32LFCSP
標(biāo)準(zhǔn)包裝： 1
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： 32-VFQFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 32-LFCSP-VQ（5x5）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： ADL5304ACPZ-R7DKR
High Speed, 200 dB Range,
Logarithmic Converter
Data Sheet
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
2011 Analog Devices, Inc. All rights reserved.
FEATURES
Optimized for very fast response at all input currents
Overall bandwidth of >4 MHz for inputs >1 μA
Bandwidth: 25 kHz at input of 1 nA and 350 kHz at 10 nA
10 decades of input range: 1 pA to 10 mA
Law conformance: ±0.25 dB from 100 pA to 100 μA
Log ratio or fixed-intercept operation
Precision voltage references and reference current
Adaptive photodiode (PD) bias for low dark current
Programmable log slope and intercept
Default log slope of 10 mV/dB at VLOG pin
Single- or dual-supply operation
APPLICATIONS
High accuracy optical power measurement
Wide range baseband log compression
Versatile detector for high speed APC loops
GENERAL DESCRIPTION
The ADL5304 is a high speed logarithmic converter with fast
response and low noise over a 200 dB (1 pA to 10 mA) measure-
ment range. The ADL5304 provides a nominal logarithmic slope of
10 mV/dB (200 mV/decade); other values are easily configured.
Logarithmic intercept can be programmed over a wide range
with the internal 100 nA current source or externally for log ratio
applications. The default intercept value of 3.162 fA places the
midpoint of the measurement range of 100 nA at VLOG = 1.5 V.
A single positive supply of 5 V is all that is required for operation
over a specified 1 pA to 3 mA input range. Dual-supply operation
extends the specified input current range to 10 mA.
The ADL5304 accepts two current inputs to the logarithmic
argument. The numerator input, INUM, flows in the collector of an
NPN transistor, connected in a feedback path around a low offset
JFET amplifier. The denominator current, IDEN, is treated in the
same way, which allows for log ratio operation. The input summing
nodes (INUM and IDEN) operate at a constant default voltage of
1.5 V. The VSM1 to VSM4 pins flank the INUM and IDEN inputs
to provide a guard voltage to minimize leakage currents.
Adaptive photodiode biasing is provided for optical measurements.
A monitor current 1.1 times INUM is output at the IMON pin, and
an external resistor, RMNTR, at 10 times the photodiode series
resistance (RS) applies a voltage across the photodiode that
1st order keeps the internal PD junction at 0 V to minimize
dark current.
The VLOG output is buffered and can be rescaled through
internal gain setting resistors. The internal ILOG varies from
400 μA to +400 μA as INUM changes over 10 decades from 1 pA
to 10 mA. This corresponds to 0.5 V to 2.5 V at the VLOG pin
in the default configuration shown in Figure 1.
Accurate 1.5 V (Pin 1P5V) and 2.0 V (Pin 2VLT) reference outputs
allow precise repositioning of the intercept using external resistors.
The ADL5304 is available in a 32-lead, 5 mm × 5 mm LFCSP
and specified for operation from 40°C to +85°C.
SIMPLIFIED BLOCK DIAGRAM
ADL5304
09
459
-001
2
30
3
4
5
6
8
7
MONITOR AND
PD BIAS
(1.1× INUM)
TEMPERATURE
COMPENSATION
1.5V
32
31
26
9
IMON
VNUM
INNM
VDEN
HFCP
COMM NMFS VNEG DNFS
VNEG
INDN
1P5V
2VLT
DCBI
BSDC
VSM1
VSM2
VSM3
IREF
IDEN
INUM
VSM4
10
11
27
29
28
100nA
1.5V
17
24
2V
BIAS AND
VREF
12
13
14
ACOM
15
16
INPS
INMS
VLOG
23
22
5k
1k
7.5k
21
20
19
18
SCL1
SCL2
SCL3
ACOM
RMNTR
VPOS
VNUM
VDEN
ILOG
Figure 1.
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