ADL5303ACPZ-R7 datasheet(1/24 Pages) AD

部件名	ADL5303ACPZ-R7

功能描述	160 dB Range 100 pA to 10 mA Low Cost Logarithmic Converter

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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160 dB Range 100 pA to 10 mA

Low Cost Logarithmic Converter

Data Sheet

ADL5303

Rev. 0

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FEATURES

Optimized for fiber optic photodiode interfacing

8 full decades of range

Law conformance: 0.1 dB from 1 nA to 1 mA

Single-supply operation: 3.0 V to 5.5 V

Complete and temperature stable

Accurate laser trimmed scaling

Logarithmic slope of 10 mV/dB (at the VLOG pin)

Basic logarithmic intercept at 100 pA

Easy adjustment of slope and intercept

Output bandwidth of 10 MHz, 15 V/μs slew rate

Miniature 16-lead package (LFCSP)

Low power: ~4.5 mA quiescent current (enabled)

APPLICATIONS

High accuracy optical power measurement

Wide range baseband log compression

Versatile detector for APC loops

SIMPLIFIED BLOCK DIAGRAM

PDB

BIAS

VREF

IPD

VPDB

VSUM

INPT

VSUM

GND

VPS2

PWDN

VPS1

VREF

VLOG

BFIN

BFNG

VOUT

0.5V

ADL5303

~10kΩ

5kΩ

5

2

3

4

15

14

ACOM

7

11

10

16

12

6

8

9

13

TEMPERATURE

COMPENSATION

Figure 1.

GENERAL DESCRIPTION

The ADL5303 is a monolithic logarithmic detector optimized

for the measurement of low frequency signal power in fiber

optic systems and offers a large dynamic range in a versatile and

easily used form. Wide measurement range and accuracy are

achieved using proprietary design and precise laser trimming.

The ADL5303 requires only a single positive supply, VPS, of 5 V.

When using low supply voltages, the log slope can be altered to

fit the available span. Low quiescent current and chip disable

facilitate use in battery-operated applications.

The input current, IPD, flows in the collector of an optimally

scaled NPN transistor, connected in a feedback path around a

low offset JFET amplifier. The current summing input node

operates at a constant voltage, independent of current, with

a default value of 0.5 V; this may be adjusted over a wide range.

An adaptive biasing scheme is provided for reducing photo-

diode dark current at very low light input levels. The VPDB pin

applies approximately 0.1 V reverse bias across the photodiode

for IPD = 100 pA, rising linearly to 2.0 V of reverse bias at IPD =

10 mA to improve response time at higher power levels. The

input pin INPT is flanked by the VSUM guard pins that track

the voltage at the summing node. Connecting the exposed pad

of the device to the VSUM pins provides a continuous guard to

minimize leakage into the INPT pin.

The default value of the logarithmic slope at the VLOG output

is set by an internal 5 kΩ resistor. Logarithmic slope can be

lowered with an external shunt resistor or increased using the

buffer and a pair of external feedback resistors. The addition of

a capacitor at the VLOG pin provides a simple low-pass filter.

The intermediate voltage, VLOG, is buffered in an output stage

that can swing to within about 100 mV of ground and the posi-

tive supply, VPS, and provides a peak current drive capacity of

±20 mA. An on-board 2 V reference is provided to facilitate

the repositioning of the intercept. The incremental bandwidth

of a translinear logarithmic amplifier inherently diminishes

for small input currents. At IPD =1 nA, the bandwidth of the

ADL5303 is approximately 2 kHz increasing in proportion to

IPD up to a maximum value of 10 MHz.

类似零件编号 - ADL5303ACPZ-R7

制造商	部件名	数据表	功能描述
Analog Devices	ADL5304	934Kb / 32P	High Speed, 200 dB Range REV. 0
	ADL5304	908Kb / 32P	High Speed, 200 dB Range, Logarithmic Converter 3/16-Rev. 0 to Rev. A
	ADL5304-EVALZ	934Kb / 32P	High Speed, 200 dB Range REV. 0
	ADL5304-EVALZ	908Kb / 32P	High Speed, 200 dB Range, Logarithmic Converter 3/16-Rev. 0 to Rev. A
	ADL5304ACPZ-R2	934Kb / 32P	High Speed, 200 dB Range REV. 0

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类似说明 - ADL5303ACPZ-R7

制造商	部件名	数据表	功能描述
Analog Devices	AD8304	4Mb / 20P	160 dB Range (100 pA -10 mA) Logarithmic Converter 8/02-Data Sheet changed from REV. 0 to REV. A.
	AD8305	1Mb / 20P	100 dB Range (10 nA to 1 mA) Logarithmic Converter 3/03-Data Sheet changed from REV. 0 to REV. A.
	ADL5306	811Kb / 16P	60 dB Range (100 nA to 100 UA) Low Cost Logarithmic Converter
	AD8304ARUZ	579Kb / 20P	160 dB Range (100 pA -10 mA) Logarithmic Converter REV. A
	ADL5310ACPZ-REEL7	595Kb / 20P	120 dB Range (3 nA to 3 mA) Dual Logarithmic Converter REV. A
	ADL5310ACPZ-REEL7	595Kb / 20P	120 dB Range (3 nA to 3 mA) Dual Logarithmic Converter REV. A
	AD8305ACPZ	429Kb / 24P	100 dB Range (10 nA to 1 mA) ogarithmic Converter REV. B
	AD8304	579Kb / 20P	160 dB Range Logarithmic Converter REV. A
	AD8305	429Kb / 24P	100 dB Range Logarithmic Converter REV. B
	ADL5308	1Mb / 22P	Fast Response 188 dB Range (10 pA to 25 mA) Logarithmic Converter Rev. 0

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