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iC-LSHB
INCREMENTAL PHOTOSENSOR ARRAY
y inar im prel
Rev B1, Page 1/8 APPLICATIONS o Incremental rotary encoders o Linear scales
FEATURES o Monolithic array of independent photosensors with excellent matching o Compact photosensor size of 800 m x 330 m enabling smaller encoder systems o Moderate track pitch for reasonable alignment tolerances o Ultra low dark currents for operation to high temperature o Low noise amplifiers with high transimpedance of typ. 4 M o Short-circuit-proof, low impedance voltage outputs for enhanced EMI tolerance o Space saving 15-pin optoBGA package (RoHS compatible) o Low power consumption from single 4.5 V to 5.5 V supply o Operational temperature range of -40 to 125 C o Available options - reticle assembly, code discs - customized COB modules
PACKAGES
15-pin optoBGA
6.2 mm x 5.2 mm
Chip
2.88 mm x 2.04 mm
BLOCK DIAGRAM
VCC
DPZ DPSIN
PZ
+
+
PSIN
DPSIN
DPCOS
DNSIN
+
NSIN
+
DNZ
DNCOS
DNSIN
DPCOS
+
PCOS
NZ
+
DPZ
DNCOS
REFERENCE VOLTAGE
+
NCOS
DNZ
GND
iC-LSHB
Copyright (c) 2009 iC-Haus
http://www.ichaus.com
iC-LSHB
INCREMENTAL PHOTOSENSOR ARRAY
y inar 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 m x 330 m. 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 m x 150 m apiece, are employed for the differential scanning of the index track and to generate the zero signal. The spectral sensitivity ranges from visible to near infrared light, with the maximum sensitivity close to a wavelength of 680 nm. Due to a high transimpedance gain of typically 4 M, 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.
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
y inar 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
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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 Voltage at VCC Current in VCC Pin Voltage, all signal outputs Pin Current, all signal outputs ESD Susceptibility, all pins Junction Temperature Chip Storage Temperature HBM, 100 pF discharged through 1.5 k -40 -40 Conditions Min. -0.3 -20 -0.3 -20 Max. 6 20 VCC + 0.3 20 2 150 150 V mA V mA kV C C Unit
G001 VCC G002 I(VCC) G003 V() G004 I() G005 Vd() G006 Tj G007 Ts
THERMAL DATA
Item No. T01 T02 T03 Symbol Ta Ts Tpk Parameter Conditions Min. Operating Ambient Temperature Range package oBGA LSH2C Storage Temperature Range Soldering Peak Temperature package oBGA LSH2C package oBGA LSH2C 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. 245 230 C C -40 -40 Typ. Max. 125 125 C C Unit
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
y inar 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. 001 002 003 004 101 102 103 104 105 106 107 Symbol Parameter Conditions Min. VCC I(VCC) Vc()hi Vc()lo ar pk Aph() Aph() S( r) S( )max E()mx Permissible Supply Voltage Supply Current in VCC Clamp-Voltage hi at all pins Clamp-Voltage lo at all pins Spectral Application Range Peak Sensitivity Wavelength Radiant Sensitive Area of DPSIN, 0.8 mm x 0.33 mm DPCOS, DNSIN, DNCOS Radiant Sensitive Area of DPZ, DNZ Spectral Sensitivity Maximum Spectral Sensitivity Irradiance For Maximum Signal Level Permissible Photocurrent Operating Range Photo Sensitivity LED = 740 nm (light-to-voltage conversion ratio) Equivalent Transimpedance Gain Z = Vout() / Iph() Temperature Coefficient of Transimpedance Gain Transimpedance Gain Matching Of Paired Amplifiers P.. channel vs. corresponding N.. channel no illumination, any output vs. any output no illumination, P.. output vs. corresponding N.. output illuminated to 500 mV signal level above dark level, 500 kHz band width illumination to E()mxr, linear gain no illumination, load 20 k vs. +2 V Vout()acmx = Vout()mx - Vout()d load current to ground load current to IC f = 1 kHz I(VREF) = 0...+1.6 mA I(VREF) = 0...+1.6 mA load current to ground load current to IC 2.45 600 1.48 100 250 70 600 -10 200 2 420 4.5 -0.2 -35 -2.5 120 180 0.5 1.72 mm x 0.15 mm LED = 740 nm r = pk LED = 740 nm, Vout() not yet saturated 0.15 no output load, photocurrents within linear operating range (no override) I() = 4 mA I() = -4 mA Se( ar) = 0.25 x S( )max -1.2 400 680 0.264 0.258 0.5 0.55 0.5 0.8 4.5 6.5 Typ. Max. 5.5 12 11 -0.3 950 V mA V V nm nm mm2 mm2 A/W A/W mW/ cm2 nA V/W M %/C 0.2 35 2.5 280 % mV mV kHz mV Unit
Total Device
Photosensors
Photocurrent Amplifiers 201 202 203 204 209 210 211 212 213 Iph() ()r Z() TCz Z()pn 0 0.8 2.69 1.2 4.0 -0.12 280 2.0 5.46
Vout()pn Signal Matching Vout()pn Signal Matching fc()hi VNoise() Cut-off Frequency (-3 dB) RMS Output Noise
Signal Outputs PSIN, NSIN, PCOS, NCOS, PZ 301 302 303 304 305 306 401 402 403 404 Vout()mx Vout()d Isc()hi Isc()lo Ri() VREF dVout() Isc()hi Isc()lo Permissible Maximum Output Voltage Dark Signal Level Short-circuit Current hi Short-circuit Current lo Internal Output Resistance Reference Voltage Load Balancing Short-circuit Current hi Short-circuit Current lo 2.72 770 1.96 420 480 110 770 3.02 1000 2.35 800 700 180 1000 +10 800 10 V mV V A A mV mV A mA
Vout()acmx Maximum Signal Level
Reference Voltage NZ
iC-LSHB
INCREMENTAL PHOTOSENSOR ARRAY
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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
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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
y inar im prel
Rev B1, Page 8/8
ORDERING INFORMATION
Type iC-LSHB
Package
Options reticle 42-1024 reticle 42-4096
Order Designation iC-LSHB chip iC-LSHB OBGA LSH2C iC-LSHB OBGA LSH2C-2R iC-LSHB OBGA LSH2C-4R
optoBGA 6.2 mm x 5.2 mm optoBGA 6.2 mm x 5.2 mm optoBGA 6.2 mm x 5.2 mm
Code Disc 1024 PPR, OD/ID 42/18 mm, glass Code Disc 4096 PPR, OD/ID 42/18 mm, glass
LSHB2S 42-1024
LSHB4S 42-4096
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: sales@ichaus.com
Appointed local distributors: http://www.ichaus.com/sales_partners

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