EVALUATION KIT AVAILABLE DS3923 High-Speed Current Mirror with Sample/Hold Output General Description Benefits and Features The DS3923 high-speed current mirror integrates high- Accurate Burst-Mode RSSI Measurement with Two voltage devices necessary for monitoring the burst-mode Current Mirror Outputs Improves Dynamic Range receive power signal in avalanche photodiode (APD) bias- -32dBm to -5dBm Optical Input Range ing and optical line terminal (OLT) applications. It provides 0.5dB Accuracy small and large gain current mirror outputs to monitor the Sampling Period as Short as 300ns APD current. A sample/hold circuit with automatic gain selection captures the sampled signal so that an external Pin Discharge Option ADC can accurately measure the signal. An adjustable Low-Noise APD Bias with Shutdown Options current clamp limits current through the APD. The clamp Reduces Receiver Sensitivity also features an external shutdown. An integrated FET is also provided which can be used to quickly clamp the 15V to 76V APD Bias high-voltage bias to ground in the case of high optical External Capacitor Connection for Controlled RC input power. Time Constant of APD Voltage Filter The DS3923 is available in a 24-pin TQFN package and Current Clamp with Adjustable Limit and External operates over an extended temperature range of -40C Shutdown with Limit Status to +95C. High-Voltage Switch FET for APD Fast Shutdown Applications Small Package Reduces Total Solution Size and Cost APD Monitoring 3.5mm x 3.5mm, 24-Pin TQFN Package with GPON OLT Exposed Pad 10GPON OLT For related parts and recommended products to use with this part, refer Ordering Information appears at end of data sheet. to www.maximintegrated.com/DS3923.related. Typical Application Circuit R1 100 ADJUSTED FROM 55V AT -40C TO 65V AT 95C BOOST DC-DC C1 C2 R2 SHDN VREF 0.1F HVD 0.1F 330k DS3923 MIRIN HVG R3 4.99k GPIO DAC GPIO ILIMS I1 APD SHUTDOWN 0.8I 0.2I 0.1I 1 1 1 3 GAIN GPIO 2:0 IOUT 10A SENXOR ISRC/ R6 SHDN GPIO ISRC R7 CURRENT RLIM 30k LIMIT 3.3V 3.3V AVCC DISCHARGE TEMP >300ns PULSE LIMIT VOP 3.3V VCC DUAL OCCURS ONCE PER GAIN VON C 100S TO ONCE LD 1.8V SAMPLE/ VIN DS4830A PER 100ms HOLD GND DIFFEN 300ns MIRIN min SEN 3.3V GPIO 0V 0V (EDGE INTERRUPT) MIROUT APDV VIP1 VIP2 250w 250w C3 DETECT SEN EDGE C4 C5 330pF APD R4 R5 1w PAPD OPT. OPT. TO 1k 1k 500pF ADC BM RSSI MONITOR, TIA AVERAGE RSSI, 4 MIRROR VOLTAGE DROP DC-DC FEEDBACK 19-6848 Rev 2 3/15DS3923 High-Speed Current Mirror with Sample/Hold Output Absolute Maximum Ratings Voltage on HVD, MIRIN, MIRCAP, and MIROUT Continuous Power Dissipation (T = +70C) A Relative to HVGND ..........................................-0.3V to +79V TQFN (derate 15.4mW/C above +70C)...............1228.9mW Voltage on V and AVCC to GND ....................-0.3V to + 4.3V Storage Temperature Range ............................ -65C to +150C CC Voltage on All Other Pins Relative Lead Temperature (soldering, 10s) .................................+300C to GND ...................-0.3V to (V + 0.3V) Not to Exceed +4V Soldering Temperature (reflow) .......................................+260C CC Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (V = 15V to 76V, V = 2.85V to 3.63V, T = -40C to +95C, unless otherwise noted.) (Note 1) MIRIN CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Low Voltage Supply V 2.85 3.63 V CC Low Voltage Current I (Note 2) 8 16 mA CC V = 60V, MIRIN I = 0A 1 2 MIROUT MIRIN Quiescent Current I ISRC/SHDN = mA MIRIN I = 1mA 3.2 4 30k to GND MIROUT MIRIN Voltage V 15 76 V MIRIN HV FET On-Resistance R V = 3.0V, I = 170mA 0.85 2 DSONHV GS D V + CC HVG Voltage V 0 V GSHV 0.3 HVD Voltage V 76 V DHV HVD Leakage I -1 +1 A ILHV 0.3 x V IL Logic-Input Thresholds (DIFFEN, V CC DISCHARGE, GAIN, HVG, SEN, V 0.7 x SENXOR) V IH V CC V 1.4 IL SHDN ISRC/SHDN Threshold V V - CC V IH SHDN 0.2 ISRC/SHDN Resistor R (Note 3 29.7 30 30.3 k ISRC R = 40.2k 1.4 2 2.8 ISRC/SHDN = LIM low Maximum MIROUT Current I R = 24.9k 2.5 3.2 4.1 mA CLAMP LIM ISRC/SHDN = high 0.01 Total capacitance on MIROUT to MIROUT Capacitive Load C 330 500 pF MIROUT achieve accuracy specification V I = -2mA 0.45 OL ILIMS ILIMS Logic Output Levels (ILIMS) V V CC V I = +2mA OH ILIMS ILIMS -0.45 Maxim Integrated 2 www.maximintegrated.com