ADL5315ACPZ-R7 Analog Devices Inc, ADL5315ACPZ-R7 Datasheet

IC,Current Mirror,LLCC,8PIN,PLASTIC

ADL5315ACPZ-R7

Manufacturer Part Number
ADL5315ACPZ-R7
Description
IC,Current Mirror,LLCC,8PIN,PLASTIC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of ADL5315ACPZ-R7

Design Resources
Interfacing ADL5315 to Translinear Logarithmic Amplifier (CN0056)
Function
Current Mirror
Sensing Method
High-Side
Voltage - Input
2.7 ~ 8 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-LFCSP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
ADL5315-EVAL - BOARD EVAL FOR ADL5315
Current - Output
-
Accuracy
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ADL5315ACPZ-R7TR
FEATURES
Accurately mirrors input current (1:1 ratio) over 6 decades
Stable mirror input voltage
Adjustable input current limit
2.7 V to 8 V single-supply operation
Miniature 8-lead LFCSP (2 mm × 3 mm)
APPLICATIONS
Optical power monitoring from a single photodiode
General voltage biasing with precision current monitoring
Voltage-to-current conversion
GENERAL DESCRIPTION
The ADL5315 is a wide input current range, precision high-side
current mirror featuring a stable and user-adjustable input
voltage. It is optimized for use with PIN photodiodes, but its
flexibility and wide operating range make it suitable for a broad
array of additional applications. Over the 3 nA to 3 mA range,
the current sourced from the INPT pin is accurately mirrored
with a 1:1 ratio and sourced from the IOUT output pin. In a
typical photodiode application, the output drives a current-
input logarithmic amplifier to produce a linear-in-dB output
representing the optical power incident upon the photodiode.
For linear voltage output, a single resistor to ground is all that is
required. The photodiode anode can be connected to a high
speed transimpedance amplifier for the extraction of the data
stream. The voltage at the INPT pin is temperature stable with
respect to the voltage at the VSET input pin, which it tracks. A
temperature stable reference voltage is provided at the SREF
pin, which, when tied to VSET, fixes the voltage at INPT 1.0 V
below VPOS. VSET can also be driven from an external source.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
Linearity 1% from 3 nA to 3 mA
Voltage held 1 V below supply using internal reference
or can be set externally
Precision Wide Range (3 nA to 3 mA)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The VSET input has very low input current and can be driven
as low as the bottom rail, facilitating nonloading voltage-to-
current conversion as well as minimizing dark current in
photodiode applications.
The ADL5315 also features adjustable input current limiting
using an external resistor from RLIM to VPOS. The maximum
current sourced by INPT (and IOUT) can be set between 1 mA
and 16 mA, beyond which the voltage at INPT falls rapidly
from its setpoint. Connecting RLIM directly to VPOS provides
basic input short-circuit protection with the default current
limit of 16 mA typical.
The ADL5315 is available in a 2 mm × 3 mm, 8-lead LFCSP and
is specified for operation from −40°C to +85°C.
High-Side Current Mirror
FUNCTIONAL BLOCK DIAGRAM
4
3
2
1
COMM
SREF
VSET
INPT
20kΩ
I
REFERENCE
PD
VOLTAGE
© 2005 Analog Devices, Inc. All rights reserved.
Figure 1.
CURRENT
MIRROR
CURRENT
LIMITING
1:1
ADL5315
I
PD
VPOS
RLIM
IOUT
NC
ADL5315
www.analog.com
5
6
7
8

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ADL5315ACPZ-R7 Summary of contents

Page 1

FEATURES Accurately mirrors input current (1:1 ratio) over 6 decades Linearity 1% from Stable mirror input voltage Voltage held 1 V below supply using internal reference or can be set externally Adjustable input current limit ...

Page 2

ADL5315 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ...

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SPECIFICATIONS μ 25°C, unless otherwise noted. POS SET INPT A Table 1. Parameter CURRENT MIRROR OUTPUT Current Gain from INPT to IOUT Current Gain from INPT to ...

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ADL5315 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Input Current at INPT Internal Power Dissipation θ (Soldered Exposed Paddle) JA Maximum Junction Temperature Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering 60 sec) ESD CAUTION ESD (electrostatic discharge) ...

Page 5

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic Description 1 INPT Input Current. Pin sources current only. 2 VSET Sets Voltage at INPT (Gain = 1). Range − ...

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ADL5315 TYPICAL PERFORMANCE CHARACTERISTICS 25°C, unless otherwise noted. POS SET SREF OUT A 2.0 +25°C, +70°C, +85°C, –40°C 0°C 0°C, –40°C 1.5 +25°C +70°C +85°C 1.0 ...

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SIGMA 10 5 AVERAGE 0 –5 –10 –3 SIGMA –15 –20 –40 –30 –20 – TEMPERATURE (°C) Figure 9. Temperature Drift of V with INPT SET ...

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ADL5315 1.010 1.005 +85 +25 1.000 –40 0.995 0.990 (V) POS Figure 15. V − V vs. V for Multiple Temperatures POS INPT POS 0.99 0.993 0.996 0.999 1.002 ...

Page 9

THEORY OF OPERATION The ADL5315 addresses the need for precision high-side monitoring of photodiode current in fiber optic systems and is useful in many nonoptical applications as well optimized for use with ADI’s family of translinear logarithmic amplifiers, ...

Page 10

ADL5315 The VSET control is intended primarily to provide a dc bias voltage for the mirror input, but it is also well behaved in the presence of the V transients. The rise time of V SET independent of input current ...

Page 11

APPLICATIONS The ADL5315 is primarily designed for wide dynamic range applications, simplifying power monitoring designs where access is only permitted to the cathode of a PIN photodiode or receiver module. Figure 22 shows a typical application where the ADL5315 is ...

Page 12

ADL5315 TRANSLINEAR LOG AMP INTERFACING The mirror current output, IOUT, of the ADL5315 is designed to interface directly to an Analog Devices translinear logarithmic amplifier, such as the AD8304, AD8305, or ADL5306. Figure 24 shows the basic connections necessary for ...

Page 13

EXTENDED OPERATING RANGE The ADL5315 is specified over an input current range mA, but the device remains fully functional over the full eight decade range specified for ADI’s flagship translinear logarithmic amplifier, the AD8304 (100 ...

Page 14

ADL5315 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 100p 1n 10n 100n 1μ 10μ I (A) INPT Figure 28. V Voltage vs. I SET RLIM Is Configured for Automatic Photodiode Biasing 2.2 2.0 1.8 1.6 ...

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Figure 31. Configuration for Noise Spectral Density and Wideband Current Noise Figure 32 shows the configuration used to measure the pulse response create the test ...

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ADL5315 EVALUATION BOARD L1 0Ω OPEN 390pF V SET Table 4. Evaluation Board (Rev. A) Configuration Options Component Function VPOS, GND Supply and ground connections. INPUT, L1, C4 Input Interface: The evaluation board is configured to accept ...

Page 17

... OUTLINE DIMENSIONS PIN 1 INDICATOR 1.00 0.85 0.80 SEATING ORDERING GUIDE Model Temperature Range 1 ADL5315ACPZ-R7 –40°C to +85°C ADL5315ACPZ- –40°C to +85°C ADL5315-EVAL Pb-free part Waffle pack 3.25 3.00 2.75 0.60 0.45 2.25 1.95 0.30 2.00 TOP VIEW 1.75 1.75 1 ...

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ADL5315 NOTES Rev Page ...

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NOTES Rev Page ADL5315 ...

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ADL5315 NOTES © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05694–0–10/05(0) Rev Page ...

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