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ADL5317 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADL5317
Beschreibung Avalanche Photodiode Bias Controller and Wide Range
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADL5317 Datasheet, Funktion
www.DataSheet4U.com
Avalanche Photodiode Bias Controller and
Wide Range (5 nA to 5 mA) Current Monitor
ADL5317
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
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
FUNCTIONAL BLOCK DIAGRAM
16
COMM
15
COMM
14
COMM
FALT
1
OVERCURRENT
PROTECTION
THERMAL
PROTECTION
VSET
2
30 × VSET
29 × R
3 VPLV
R
13
COMM
ADL5317
CURRENT
MIRROR
5:1
NC 12
IPDM
11
IAPD
5
NC 10
4 VPHV
VPHV VCLH
56
GARD
7
Figure 1.
IAPD
VAPD
8
GARD 9
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.
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.
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.






ADL5317 Datasheet, Funktion
ADL5317
TYPICAL PERFORMANCE CHARACTERISTICS
VPHV = 78 V, VPLV = 5 V, VAPD = 60 V, IAPD = 5 μA, TA = 25°C, unless otherwise noted.
10m
1m
100μ
10μ
+85°C
–40°C
+25°C
2.0 10m
1.5 1m
VPHV = 78V, VAPD = 60V
VPHV = 45V, VAPD = 32V
VPHV = 10V, VAPD = 6V
1.0 100μ
VPHV = 78V, VAPD = 60V
0.5 10μ VPHV = 45V, VAPD = 32V
1μ 0 1μ
100n
–0.5
10n
+85°C
–1.0
1n
100p
1n
+25°C
–40°C
10n 100n
1μ
–1.5
–2.0
10μ 100μ 1m 10m
IAPD (Amperes)
100n
10n
VPHV = 10V,
VAPD = 6V
1n
100p
1n
10n 100n 1μ
10μ 100μ 1m
IAPD (Amperes)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
10m
Figure 3. IPDM Linearity for Multiple Temperatures,
Normalized to IAPD = 5 μA, 25°C
80
70
60 VPHV = 78V, +85°C
VPHV = 78V, +25°C
50
VPHV = 78V, –40°C
40
30
VPHV = 45V,
–40°C
20
10
VPHV = 45V, +85°C
VPHV = 45V, +25°C
0
0 0.5 1.0 1.5 2.0 2.5 3.0
VSET (V)
Figure 4. VAPD vs. VSET for Multiple Temperatures,
VPHV = 78 V and VPHV = 45 V, IAPD = 5 μA
2.150
2.125
2.100
2.075
2.050
2.025
2.000
1.975
1.950
1.925
1.900
1.875
1.850
0
–40°C
+25°C
+85°C
10 20 30 40 50 60 70 80
VPHV (V)
90
Figure 5. VAPD Supply Tracking Offset vs. VPHV for Multiple Temperatures
Figure 6. IPDM Linearity for Multiple Values of VAPD and VPHV,
Normalized to IAPD = 5 μA, VPHV =78 V, VAPD = 60 V
31.0
30.8
30.6
VPHV = 45V, +85°C
VPHV = 45V, +25°C
VPHV = 45V, –40°C
VPHV = 78V, +85°C
VPHV = 78V, +25°C
VPHV = 78V, –40°C
30.4
30.2
30.0
29.8
29.6
29.4
29.2
29.0
0
0.5 1.0 1.5 2.0 2.5 3.0
VSET (V)
Figure 7. Incremental Gain from VSET to VAPD vs. VSET for
Multiple Temperatures, IAPD = 5 μA, VPHV = 78 V and 45 V
70
78/60 +25°C
78/60 –40°C
78/60 +85°C 0.030
45/32 +25°C
45/32 –40°C
45/32 +85°C
10/6 +25°C
10/6 –40°C
10/6 +85°C
60 0.020
VPHV = 78V, VAPD = 60V; +85°C, +25°C, –40°C
50 0.010
40 0
30 VPHV = 45V, VAPD = 32V; +85°C, +25°C, –40°C
20
–0.010
–0.020
10
0
1n
VPHV = 10V, VAPD = 6V; +85°C, +25°C, –40°C
10n 100n
1μ
10μ 100μ
IAPD (Amperes)
1m
–0.030
–0.040
10m
Figure 8. VAPD vs. IAPD for Multiple Temperatures and Values of VPHV and VAPD
Rev. 0 | Page 6 of 16

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ADL5317 pdf, datenblatt
ADL5317
AD8305 INPUT
COMPENSATION
NETWORK
16 15 14 13
10kΩ
VP_LOW
0.1μF
1
VSET
2
3
0Ω
4
0.01μF
16 15 14
FALT
VSET
VPLV
ADL5317
VPHV
13
NC
IPDM
NC
GARD
1kΩ
12
11
10
9
1
1nF 2.5V
2
200kΩ
4.7nF 2kΩ
3
4
IPDM
10nA TO
1mA
VRDZ
VREF
IREF
INPT
AD8305
567
VOUT
SCAL
BFIN
VLOG
8
0.01μF
0.1μF
3V TO 12V
12
11
10
9
0.01μF
0Ω
5678
IAPD
1kΩ
0.1μF
VP_HIGH
APD 1nF
TIA
DATA
PATH
OUTPUT
VOUT = 0.2 ×
LOG10 (IPDM/1nA)
Figure 23. Interfacing the ADL5317 to the AD8305 for High Accuracy APD Power Monitoring
Measured rms noise voltage at the output of the AD8305 vs.
input current is shown in Figure 24 for the AD8305 by itself
and in cascade with the ADL5317. The relatively low noise
produced by the ADL5317, combined with the additional noise
filtering inherent in the frequency response characteristics of
the AD8305, result in minimal degradation to the noise
performance of the AD8305.
5.5m
5.0m
4.5m
4.0m
3.5m
3.0m
AD8305 AND
ADL5317
2.5m
2.0m
1.5m
AD8305 ONLY
1.0m
0.5m
0
10n 100n
1μ 10μ
(A)
100μ
1m
Figure 24. Measured RMS Noise of AD8305 vs. AD8305
Cascaded with ADL5317
CHARACTERIZATION METHODS
During characterization, the ADL5317 was treated as a high
voltage 5:1 precision current mirror. To make accurate
measurements throughout the entire current range, calibrated
Keithley 236 current sources were used to create and measure
the test currents. Measurements at low current and high voltage
are very susceptible to leakage to the ground plane.
To minimize leakage on the characterization board, the guard
pins are connected to traces that buffer VAPD and IPDM from
ground. The triax guard connector is also connected to the
GARD pin of the device to provide buffering along the cabling.
Figure 25 shows the primary characterization setup. The data
gathered is used directly, or with calculation, for all the static
measurements, including mirror error between IAPD and
IPDM , supply tracking offset, incremental gain, and VAPD vs.
IAPD. Component selection is very similar to that of the
evaluation board, except that triax connectors are used in place
of the SMA connectors. To measure the pulse response, output
noise, and bandwidth measurements, more specialized test
setups are used.
ADL5317
VAPD
CHARACTERIZATION BOARD
KEITHLEY 236
IPDM
FALT VPHV VPLV VSET VCLH
DC SUPPLIES/DMM
KEITHLEY 236
TRIAX CONNECTORS:
SIGNAL - VAPD AND IPDM PINS
GUARD - GUARD PIN
SHIELD - GROUND
Figure 25. Primary Characterization Setup
Rev. 0 | Page 12 of 16

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