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PDF DS3920 Data sheet ( Hoja de datos )
| Número de pieza | DS3920 | |
| Descripción | Fast Current Mirror | |
| Fabricantes | Maxim Integrated Products | |
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19-5797; Rev 0; 3/11
DS3920
Fast Current Mirror
General Description
The DS3920 precision current mirror is designed for ava-
lanche photodiode (APD) and PIN photodiode biasing
and monitoring applications. The device offers a current
clamp to limit current through the APD and a current mir-
ror output that produces a signal proportional (5:1) to the
APD current. A diode is also provided to limit the voltage
at the current mirror output.
The device accepts a +2.97V to +76V current mirror
supply voltage. Internal current limiting (2.9mA or 20mA,
typ) protects the monitored device from a short circuit to
ground. The provided internal clamp diode protects the
current mirror output from overvoltage. Additionally, the
device features thermal shutdown if the die temperature
reaches +150NC.
The device is available in a 6-pin SOT23 package, and
operates over the -40NC to +85NC extended temperature
range.
Features
S Wide Voltage Input Range: 2.97V to 76V
S Current Monitor
Wide 250nA to 2mA Range
5:1 Mirror Ratio
Fast 50ns Time Constant
S Current Clamp (2.9mA or 20mA, typ)
S Voltage Clamp Protects Subsequent Output Circuitry
S 6-Pin SOT23 (MAX4007 Compatible)
Applications
Avalanche Photodiode (APD) Biasing
PIN Photodiode Monitoring
GEPON, GPON, 10GEPON, XGPON: ONU and OLT
Ordering Information appears at end of data sheet.
Typical Application Circuit
www.DataSheet4U.net
3.3V
DIODE
CURRENT
MONITOR
IMIROUT
MIRIN
IMIROUT/5
APD BIAS
RFILTER
CFILTER
0.1μF
THERMAL
SHUTDOWN
GND
CURRENT
LIMIT
MIROUT
DS3920
RAGC
499Ω
ROSA
APD
TIA
MIR IMIROUT/5
VOUT
ROUT
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/DS3920.related
����������������������������������������������������������������� Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
(TA = +25°C, unless otherwise noted.)
SHORT-CIRCUIT RESPONSE
(VMIRIN = 40V)
DS3920 toc12
TA = +40°C
AB
CDE F
CH1
0A
20ms/div
CH1: IMIROUT, 5mA/div
A: MIROUT SHORTS TO GND THROUGH 10Ω
B: CURRENT LIMIT ACTIVE
C: THERMAL SHUTDOWN
D: POST COOL-DOWN REENTRY
E: THERMAL SHUTDOWN
F: POST COOL-DOWN REENTRY
DS3920
Fast Current Mirror
Typical Operating Characteristics (continued)
SHORT-CIRCUIT RESPONSE
(VMIRIN = 76V)
DS3920 toc13
TA = +40°C
AB
C D EF
CH1
0A
20ms/div
CH1: IMIROUT, 5mA/div
A: MIROUT SHORTS TO GND THROUGH 10Ω
B: CURRENT LIMIT ACTIVE
C: THERMAL SHUTDOWN
D: POST COOL-DOWN REENTRY
E: THERMAL SHUTDOWN
F: POST COOL-DOWN REENTRY
VOLTAGE DROP vs. MIROUT CURRENT
1.4
VMIRIN = 2.97V
1.2
1.0 TA = -40°C
0.8
TA = +25°C
0.6
0.4
0.2
0
0.001
TA = +100°C
TA = +85°C
0.01 0.1
1
IMIROUT (mA)
10
100
Pin Configuration
TOP VIEW
www.DataSheet4U.net
+
DIODE 1
GND 2
DS3920
6 MIRIN
5 N.C.
MIR 3
4 MIROUT
SOT23
Pin Description
PIN NAME
FUNCTION
Protection Diode. External potential used
1 DIODE for voltage clamping of VMIR. If unused,
this pin can be left unconnected.
2 GND Ground
3 MIR Mirror Current Monitor Output, 5:1 Ratio
Current Mirror Voltage Output. Connect to
4 MIROUT photodiode bias pin. Photodiode
provides reference current for the mirror.
5
N.C.
No Connection. Not internally
connected.
6 MIRIN Current Voltage Bias
����������������������������������������������������������������� Maxim Integrated Products 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet DS3920.PDF ] | |
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