iC-LSHB INCREMENTAL PHOTOSENSOR ARRAY ar y n i im prel Rev B1, Page 1/8 FEATURES APPLICATIONS ♦ Monolithic array of independent photosensors with excellent matching ♦ Compact photosensor size of 800 µm x 330 µm enabling smaller encoder systems ♦ Moderate track pitch for reasonable alignment tolerances ♦ Ultra low dark currents for operation to high temperature ♦ Low noise amplifiers with high transimpedance of typ. 4 MΩ ♦ Short-circuit-proof, low impedance voltage outputs for enhanced EMI tolerance ♦ Space saving 15-pin optoBGA package (RoHS compatible) ♦ Low power consumption from single 4.5 V to 5.5 V supply ♦ Operational temperature range of -40 to 125 °C ♦ Available options - reticle assembly, code discs - customized COB modules ♦ Incremental rotary encoders ♦ Linear scales PACKAGES 15-pin optoBGA Chip 6.2 mm x 5.2 mm 2.88 mm x 2.04 mm BLOCK DIAGRAM VCC PZ - DPZ + DPSIN DPSIN - DNCOS PSIN + DPCOS DNSIN DNZ - - NSIN + DNSIN + DPCOS NZ - - PCOS + DPZ + DNCOS REFERENCE VOLTAGE GND Copyright © 2009 iC-Haus - NCOS + DNZ iC-LSHB http://www.ichaus.com iC-LSHB INCREMENTAL PHOTOSENSOR ARRAY ar y n i im prel Rev B1, Page 2/8 DESCRIPTION iC-LSHB is an optical sensor IC with 6 integrated photodiodes whose signal currents are converted into output voltages by low-noise transimpedance amplifiers. The IC is well suited for the operation of interpolation circuits for linear or rotary incremental encoders with an index signal. iC-LSHB thus has a shamrock-style sensor layout of four photodiodes, each with an active area of 800 µm x 330 µm. Both a positive and negative sine signal and a positive and negative cosine signal are generated from a single shared code track. The signal amplifier layout ensures excellent paired channel matching, reducing signal differences to an absolute minimum. Two separate photodiodes, with active areas of 1720 µm x 150 µm apiece, are employed for the differential scanning of the index track and to generate the zero signal. infrared light, with the maximum sensitivity close to a wavelength of 680 nm. Due to a high transimpedance gain of typically 4 MΩ, signal voltages of several hundred millivolts are obtained at low illumination levels. An output signal amplitude of 1 V is typical in low light conditions, for instance when iC-LSHB is illuminated at only 0.2 mW/cm2 by a 740 nm LED. A threefold intensity is sufficient when using iC-LSHB for encoder applications with typical disc and mask codes. Therefore, a relatively low LED current is enough to operate the sensor, proving beneficial to the life expectancy of the LED at high operating temperatures. iC-LSHB is suitable for on-chip or LED-end mounting of the grating (reticle), so that the period count, signal waveform, phase shift and index marker code can be selected with flexibility. The spectral sensitivity ranges from visible to near PACKAGES PAD LAYOUT (2.88 mm x 2.04 mm) PAD FUNCTIONS No. Name Function 1 2 3 4 5 6 7 8 VCC PZ NZ GND NCOS PCOS NSIN PSIN +4.5..5.5 V Supply Voltage Zero Signal (Index) Reference Voltage Output Ground Cosine Cosine + Sine Sine + Notes: All outputs supply analog voltages. Dimension G4 is the reference radius of the chip center. iC-LSHB INCREMENTAL PHOTOSENSOR ARRAY ar y n i im prel Rev B1, Page 3/8 PIN CONFIGURATION oBGA LSH2C (6.2 mm x 5.2 mm) PIN FUNCTIONS No. Name Function A2 A3 A4 B1 B2 B3 B4 C1 C2 C3 C4 D1 D2 D3 D4 NCOS PCOS NZ GND NSIN PSIN VCC PZ Cosine Cosine + Reference Voltage Output Ground Sine Sine + +4.5..5.5 V Supply Voltage Zero Signal (Index) iC-LSHB INCREMENTAL PHOTOSENSOR ARRAY ar y n i im prel Rev B1, Page 4/8 ABSOLUTE MAXIMUM RATINGS These ratings do not imply operating conditions; functional operation is not guaranteed. Beyond these ratings device damage may occur. Item No. Symbol Parameter Conditions Unit Min. Max. G001 VCC Voltage at VCC -0.3 6 V G002 I(VCC) Current in VCC -20 20 mA G003 V() Pin Voltage, all signal outputs -0.3 VCC + 0.3 V G004 I() Pin Current, all signal outputs -20 20 mA G005 Vd() ESD Susceptibility, all pins 2 kV G006 Tj Junction Temperature -40 150 °C G007 Ts Chip Storage Temperature -40 150 °C HBM, 100 pF discharged through 1.5 kΩ THERMAL DATA Item No. Symbol Parameter Conditions Unit Min. Typ. Max. T01 Ta Operating Ambient Temperature Range package oBGA LSH2C -40 125 °C T02 T03 Ts Tpk Storage Temperature Range package oBGA LSH2C -40 125 °C Soldering Peak Temperature package oBGA LSH2C 245 230 °C °C tpk < 20 s, convection reflow tpk < 20 s, vapor phase soldering TOL (time on label) 8 h; Please refer to customer information file No. 7 for details. All voltages are referenced to ground unless otherwise stated. All currents flowing into the device pins are positive; all currents flowing out of the device pins are negative. iC-LSHB INCREMENTAL PHOTOSENSOR ARRAY ar y n i im prel Rev B1, Page 5/8 ELECTRICAL CHARACTERISTICS Operating conditions: VCC = 4.5..5.5 V, Tj = -40..125 °C, unless otherwise stated Item No. Symbol Parameter Conditions Unit Min. Typ. Max. Total Device 001 VCC Permissible Supply Voltage 002 I(VCC) Supply Current in VCC no output load, photocurrents within linear operating range (no override) 4.5 003 Vc()hi Clamp-Voltage hi at all pins I() = 4 mA 004 Vc()lo Clamp-Voltage lo at all pins I() = -4 mA -1.2 Se(λ ar) = 0.25 x S(λ )max 400 6.5 5.5 V 12 mA 11 V -0.3 V 950 nm Photosensors 101 λ ar Spectral Application Range 102 λ pk Peak Sensitivity Wavelength 103 Aph() 104 680 nm Radiant Sensitive Area of DPSIN, 0.8 mm x 0.33 mm DPCOS, DNSIN, DNCOS 0.264 mm2 Aph() Radiant Sensitive Area of DPZ, DNZ 1.72 mm x 0.15 mm 0.258 mm2 105 S(λ r) Spectral Sensitivity λ LED = 740 nm 0.5 A/W 106 S(λ )max Maximum Spectral Sensitivity λ r = λ pk 0.55 107 E()mx Irradiance For Maximum Signal Level λ LED = 740 nm, Vout() not yet saturated 0.15 0.5 A/W 0.8 mW/ cm2 280 nA 1.2 2.0 V/µW 4.0 5.46 Photocurrent Amplifiers 201 Iph() Permissible Photocurrent Operating Range 0 202 η()r Photo Sensitivity λ LED = 740 nm (light-to-voltage conversion ratio) 0.8 203 Z() Equivalent Transimpedance Gain Z = Vout() / Iph() 2.69 204 TCz Temperature Coefficient of Transimpedance Gain 209 ∆Z()pn Transimpedance Gain Matching Of Paired Amplifiers 210 ∆Vout()pn Signal Matching no illumination, any output vs. any output 211 ∆Vout()pn Signal Matching no illumination, P.. output vs. corresponding N.. output 212 fc()hi Cut-off Frequency (-3 dB) 213 VNoise() RMS Output Noise -0.12 P.. channel vs. corresponding N.. channel -0.2 MΩ %/°C 0.2 % -35 35 mV -2.5 2.5 mV 280 kHz 120 illuminated to 500 mV signal level above dark level, 500 kHz band width 180 0.5 mV Signal Outputs PSIN, NSIN, PCOS, NCOS, PZ 301 Vout()mx Permissible Maximum Output Voltage illumination to E()mxr, linear gain 2.45 2.72 3.02 V 302 Vout()d Dark Signal Level no illumination, load 20 kΩ vs. +2 V 600 770 1000 mV 303 Vout()acmx Maximum Signal Level Vout()acmx = Vout()mx - Vout()d 1.48 1.96 2.35 V 304 Isc()hi Short-circuit Current hi load current to ground 100 420 800 µA 305 Isc()lo Short-circuit Current lo load current to IC 250 480 700 µA 306 Ri() Internal Output Resistance f = 1 kHz 70 110 180 Ω 770 1000 mV +10 mV Reference Voltage NZ 401 VREF Reference Voltage I(VREF) = 0...+1.6 mA 600 402 dVout() Load Balancing I(VREF) = 0...+1.6 mA -10 403 Isc()hi Short-circuit Current hi load current to ground 200 420 800 µA 404 Isc()lo Short-circuit Current lo load current to IC 2 4.5 10 mA iC-LSHB INCREMENTAL PHOTOSENSOR ARRAY ar y n i im prel Rev B1, Page 6/8 APPLICATION HINTS Figure 1: Example of incremental encoder with RS422 output Figure 2: Example of sine encoder with 1 Vpp output iC-LSHB INCREMENTAL PHOTOSENSOR ARRAY ar y n i im prel Rev B1, Page 7/8 iC-Haus expressly reserves the right to change its products and/or specifications. An Infoletter gives details as to any amendments and additions made to the relevant current specifications on our internet website www.ichaus.de/infoletter; this letter is generated automatically and shall be sent to registered users by email. Copying – even as an excerpt – is only permitted with iC-Haus approval in writing and precise reference to source. iC-Haus does not warrant the accuracy, completeness or timeliness of the specification on this site and does not assume liability for any errors or omissions in the materials. The data specified is intended solely for the purpose of product description. No representations or warranties, either express or implied, of merchantability, fitness for a particular purpose or of any other nature are made hereunder with respect to information/specification or the products to which information refers and no guarantee with respect to compliance to the intended use is given. In particular, this also applies to the stated possible applications or areas of applications of the product. iC-Haus conveys no patent, copyright, mask work right or other trade mark right to this product. iC-Haus assumes no liability for any patent and/or other trade mark rights of a third party resulting from processing or handling of the product and/or any other use of the product. As a general rule our developments, IPs, principle circuitry and range of Integrated Circuits are suitable and specifically designed for appropriate use in technical applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. In principle the range of use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued annually by the Bureau of Statistics in Wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in Hanover (Hannover-Messe). We understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations of patent law. Our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can be put to. iC-LSHB INCREMENTAL PHOTOSENSOR ARRAY ar y n i im prel Rev B1, Page 8/8 ORDERING INFORMATION Type Package Options Order Designation optoBGA 6.2 mm x 5.2 mm optoBGA 6.2 mm x 5.2 mm optoBGA 6.2 mm x 5.2 mm reticle 42-1024 reticle 42-4096 iC-LSHB chip iC-LSHB OBGA LSH2C iC-LSHB OBGA LSH2C-2R iC-LSHB OBGA LSH2C-4R Code Disc 1024 PPR, OD/ID ∅42/18 mm, glass LSHB2S 42-1024 Code Disc 4096 PPR, OD/ID ∅42/18 mm, glass LSHB4S 42-4096 iC-LSHB For technical support, information about prices and terms of delivery please contact: iC-Haus GmbH Am Kuemmerling 18 D-55294 Bodenheim GERMANY Tel.: +49 (61 35) 92 92-0 Fax: +49 (61 35) 92 92-192 Web: http://www.ichaus.com E-Mail: [email protected] Appointed local distributors: http://www.ichaus.com/sales_partners