preliminary technical data preliminary technical data rev. prc a 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. no license is granted by implication or otherwise under any patent or patent rights of analog devices. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781/329-4700 www.analog.com fax: 781/326-8703 ? analog devices, inc., 2003 ADN8810 programmable precision current source for tunable laser * protected by u.s.patent no. 5,969,657; other patents pending. features high precision 12-bit current source low noise long term stability current output from 0 ma to 300 ma output fault indication low drift programmable maximum current 4 mm 4 mm lead frame chip scale package 3-wire serial interface applications turnable laser current source programmable high output current source functional block diagram reset reset encomp fb dvd avd d pvdd 5v 5v 3.3v 4.096v vref cs serial interface sclk sdi address addr0-3 iout rsn rsn 1.6 rsn 1.6 d1 ADN8810 fau lt sb a vss d vss dgnd sb fau lt indication 3 general description the ADN8810 is a tunable laser controller that provides high precision, low noise current sources and all other control signals needed for tunable laser devices. the ADN8810 tunable laser controller can drive the laser section, the laser front mirror, back mirror, phase, gain or amplification. it interfaces to the host system over a serial interface. the host controls the operation of the controller. resolution and accuracy are 12-bits with 3 lsb inl and lsb dnl. noise and digital feed through are kept low to ensure low jitter operation. full scale and scaled output currents are given in equations 1 and 2, respectively. i v r fs ref sn a 10 (1) i code v r r k out ref sn sn = + ? ? ? 4096 1 15 01 . (2)
preliminary technical data rev. prc e2e ADN8810especifications (avdd = dvdd = 5 v, pvdd = 3.3 v, avss = dvss = dgnd = 0 v, t a = 25 hz s hz s hz sr ers s srr srr b sc tetect t st ss t h cts c h h tercet c c hz reset tes ss stc
preliminary technical data rev. prc ADN8810 e3e timing characteristics 1,2 parameter description min typ max unit f clk sclk frequency 25 mhz t 1 sclk cycle time 40 ns t 2 sclk width high 20 ns t 3 sclk width low 20 ns t 4 cs schs cs hschs sch cs h sch cs hh s h cs h reset cs h reset h tes s h s sc cs t reset t
preliminary technical data rev. prc e4e ADN8810 caution esd (electrostatic discharge) sensitive device. electrostatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge without detection. although the ADN8810 features proprietary esd protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality. warning! esd sensitive device absolute maximum ratings supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6v input voltage . . . . . . . . . . . . . . . . . . . . . . . gnd to v s + 0.3v output short-circuit duration to gnd . . . . . . . . . . indefinite storage temperature range . . . . . . . . . . . . . e65
preliminary technical data rev. prc ADN8810 e5e ADN8810 pin functions pin name type description 1 addr2 digital input chip address, bit 2 2 rsn analog input sense resistor rs2 feedback 3f b analog input sense resistor rs1 feedback 4 addr1 digital input chip address, bit 1 5 addr0 digital input chip address, bit 0 6 fault digital output load open/short indication 7 sb t t c t c t ec css c re rer c ss c c ss c s s sc s cs c reset cz
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