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ADL5317 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADL5317
Description  Avalanche Photodiode Bias Controller and Wide Range (5 nA to 5 mA) Current Monitor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADL5317 Datasheet(HTML) 1 Page - Analog Devices

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Avalanche Photodiode Bias Controller and
Wide Range (5 nA to 5 mA) Current Monitor
ADL5317
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
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
© 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Accurately sets avalanche photodiode (APD) bias voltage
Wide bias range from 6 V to 75 V
3 V-compatible control interface
Monitors photodiode current (5:1 ratio) over six decades
Linearity 0.25% from 10 nA to 1 mA, 0.5% from 5 nA to 5 mA
Overcurrent protection and overtemperature shutdown
Miniature 16-lead chip scale package (LFCSP 3 mm
× 3 mm)
APPLICATIONS
Optical power monitoring and biasing in APD systems
Wide dynamic range voltage sourcing and current
monitoring in high voltage systems
FUNCTIONAL BLOCK DIAGRAM
OVERCURRENT
PROTECTION
THERMAL
PROTECTION
FALT
VSET
VPLV
VPHV
VPHV
VCLH
GARD
VAPD
IAPD
CURRENT
MIRROR
5:1
30
× V
SET
IAPD
5
ADL5317
R
29
× R
COMM
16
COMM
15
COMM
14
COMM
13
13
1
2
3
4
5
6
7
8
IPDM
11
12
NC
10
NC
9
GARD
Figure 1.
GENERAL DESCRIPTION
The ADL5317 is a high voltage, wide dynamic range, biasing
and current monitoring device optimized for use with
avalanche photodiodes. When used with a stable high voltage
supply (up to 80 V), the bias voltage at the VAPD pin can be
varied from 6 V to 75 V using the 3 V-compatible VSET pin.
The current sourced from the VAPD pin over a range of 5 nA to
5 mA is accurately mirrored with an attenuation of 5 and
sourced from the IPDM monitor output. In a typical
application, the monitor output drives a current input
logarithmic amplifier to produce an output representing the
optical power incident upon the photodiode. The photodiode
anode can be connected to a high speed transimpedance
amplifier for the extraction of the data stream.
A signal of 0.2 V to 2.5 V with respect to ground applied at the
VSET pin is amplified by a fixed gain of 30 to produce the 6 V
to 75 V bias at Pin VAPD. The accuracy of the bias control
interface of the ADL5317 allows for straightforward calibration,
thereby maintaining a constant avalanche multiplication factor
of the photodiode over temperature. The current monitor
output, IPDM, maintains its high linearity vs. photodiode
current over the full range of APD bias voltage. The current
ratio of 5:1 remains constant as VSET and VPHV are varied.
The ADL5317 also offers a supply tracking mode compatible
with adjustable high voltage supplies. The VAPD pin accurately
follows 2.0 V below the VPHV supply pin when VSET is tied to
a voltage from 3.0 V to 5.5 V (or higher with a current limiting
resistor), and the VCLH pin is open.
Protection from excessive input current at VAPD as well as
excessive die temperature is provided. The voltage at VAPD falls
rapidly from its setpoint when the input current exceeds 18 mA
nominally. A die temperature in excess of 140°C will cause the
bias controller and monitor to shut down until the temperature
falls below 120°C. Either overstress condition will trigger a logic
low at the FALT pin, an open collector output loaded by an
external pull-up to an appropriate logic supply (1 mA max).
The ADL5317 is available in a 16-lead LFCSP package and is
specified for operation from −40°C to +85°C.


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