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iC-PD3948
preliminary
Rev B4, Page 1/9
5-CHAN. PHASED ARRAY SINE ENCODER 39-2048
FEATURES o Compact encoder sensor with differential scanning and sine outputs o Phased-array design for excellent signal matching o Reduced cross talk due to moderate track pitch 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 QFN and optoBGA packages (RoHS compliant) o Low power consumption from single 4.5 to 5.5 V supply o Operational temperature range of -40 to +110 C o Code disc available (2048 PPR +C/D 1 PPR, diameter 39 mm)
APPLICATIONS o Incremental sine encoders with commutation information o Motor feedback encoder o AC and BLDC motor systems
PACKAGES
32-pin optoQFN 15-pin optoBGA
Chip
2.88 mm x 3.37 mm
BLOCK DIAGRAM

iC-PD3948

Copyright (c) 2009 iC-Haus
http://www.ichaus.com
iC-PD3948
preliminary
Rev B4, Page 2/9
5-CHAN. PHASED ARRAY SINE ENCODER 39-2048
DESCRIPTION iC-PD3948 is an optical sensor IC with integrated photodiodes whose signal currents are converted into output voltages by low-noise transimpedance amplifiers. Due to a high transimpedance gain of typically 4 M, output signal voltages of several hundred Millivolts are obtained at illumination levels of just 1 to 3 mW/cm2 . In most cases complicated noise suppression measures are thus rendered unnecessary. As the pin names would suggest, iC-PD3948 is typically applied as a sine encoder for motor feedback systems. To this end, iC-PD3948 provides sine and cosine signals with both a high resolution of 2048 PPR (plus an additional index signal) and a low resolution of 1 PPR (at C/D). All code disc signal tracks are evaluated differentially; the high resolution sine signals are read by photodiodes in a phased array. The layout of the signal amplifiers is such that there is good paired channel matching, reducing the time and effort required for calibration to an absolute minimum. The spectral sensitivity ranges from visible to near infrared light, with the maximum sensitivity close to a wavelength of 680 nm. An output voltage of 1 V is typical in low light conditions, for instance when iCPD is illuminated at only 2 mW/cm2 by a 740 nm LED. A relatively low LED current is enough to operate the sensor, proving beneficial to the life expectancy of the LED at high operating temperatures.
PACKAGES AND CHIP LAYOUT INFORMATION PAD LAYOUT (2.88 mm x 3.37 mm) PAD FUNCTIONS No. Name Function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 VCC VREF PSIN NSIN PCOS NCOS Z NZ ND PD NC PC VRDC VRSC GND +4.5...5.5 V Supply Voltage Reference Voltage Output Sine Track + Sine Track Cosine Track + Cosine Track Z Index Signal Z Index Track D Track D Track + C Track C Track + D/C Track Reference S/C Track Reference Ground Notes: All outputs are analog voltage outputs.
iC-PD3948
preliminary
Rev B4, Page 3/9
5-CHAN. PHASED ARRAY SINE ENCODER 39-2048
PIN CONFIGURATION oQFN32-5x5, oQFN32-N5x5 (5 mm x 5 mm)
32 31 30 29 28 27 26 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 24 23 22 21 20 19 18 17
dra_pdxx-oqfn32-n_pack_2, 10:1
PIN FUNCTIONS No. Name Function 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 VCC VREF PSIN NSIN PCOS NCOS Z NZ ND PD NC PC VRDC VRSC GND BP +4.5...5.5 V Supply Voltage Reference Voltage Output Sine Track + Sine Track Cosine Track + Cosine Track Z Index Signal Z Index Track D Track D Track + C Track C Track + D/C Track Reference S/C Track Reference Ground Backside pad (oQFN32-5x5 only): not intended as an electrical connection point; when using as shield a single link to GND is permissible.
PIN CONFIGURATION oBGA LSH2C (6.2 mm x 5.2 mm)
PIN FUNCTIONS No. Name Function
1 A B C D
2
3
4
dra_lsh2c-pdxx_pack_2, 8:1
A2 A3 A4 B1 B2 B3 B4 C1 C2 C3 C4 D1 D2 D3 D4
VCC VREF GND PSIN NSIN VRDC VRSC PCOS NCOS NC PC Z NZ ND PD
+4.5...5.5 V Supply Voltage Reference Voltage Output Ground Sine Track + Sine Track D/C Track Reference S/C Track Reference Cosine Track + Cosine Track C Track C Track + Z Index Signal Z Index Track D Track D Track +
iC-PD3948
preliminary
Rev B4, Page 4/9
5-CHAN. PHASED ARRAY SINE ENCODER 39-2048
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 Symbol Ta Parameter Conditions Min. Operating Ambient Temperature Range package oBGA LSH2C package oQFN32-N5x5 package oQFN32-5x5* (extended temperature range on request) T02 Ts Storage Temperature Range package oBGA LSH2C, package oQFN32-N5x5, oQFN32-5x5* 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. T04 Tpk Soldering Peak Temperature package oQFN32-N5x5, oQFN32-5x5* tpk < 20 s, convection reflow tpk < 20 s, vapor phase soldering MSL 5A (max. floor live 24 h at 30 C and 60 % RH); Please refer to customer information file No. 7 for details. 245 230 C C 245 230 C C -40 110 C -40 -40 -40 Typ. Max. 110 110 110 C C C Unit
T03
Tpk
Soldering Peak Temperature
*) Package qualification pending.
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-PD3948
preliminary
Rev B4, Page 5/9
5-CHAN. PHASED ARRAY SINE ENCODER 39-2048
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 Symbol Parameter Conditions Min. VCC I(VCC) Vc()hi Vc()lo ar pk Aph() Permissible Supply Voltage Supply Current Clamp-Voltage hi at all pins Clamp-Voltage lo at all pins Spectral Application Range Peak Sensitivity Wavelength Radiant Sensitive Area DPSIN, DNSIN, DPCOS, DNCOS DPC, DNC, DPD, DND DPZ, DNZ LED = 740 nm LED = pk LED = 740 nm, Vout() not saturated DPSIN, DNSIN, DPCOS, DNCOS DPC, DNC, DPD, DND DPZ, DNZ Photocurrent Amplifiers 201 202 203 204 209 210 211 212 213 Iph() ()r Z() TCz Z()pn 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 to any output no illumination, P vs. N path per diff. channel 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 2.45 600 1.48 100 250 70 600 current to ground current to IC 100 250 70 -0.2 -35 -2.5 120 180 0.5 0 0.8 2.69 1.2 4.0 -0.12 0.2 35 2.5 280 280 2.0 5.46 nA V/W M %/C % mV mV kHz mV 1.2 3.0 2.8 no load, photocurrents within op. range I() = 4 mA I() = -4 mA Se( ar) = 0.25 x S( )max -1.2 400 680 0.075 0.033 0.042 0.5 0.55 2.0 4.5 4.2 3.2 6.5 6.0 4.5 12 Typ. Max. 5.5 16 11 -0.3 950 V mA V V nm nm mm2 mm2 mm2 A/W A/W mW/ cm2 mW/ cm2 mW/ cm2 Unit
Total Device
Photosensors
104 105 106
S( ) E()mx
Spectral Sensitivity Irradiance For Maximum Signal Level
S( pk)max Maximum Spectral Sensitivity
Vout()pn Signal Matching Vout()pn Signal Matching fc()hi VNoise() Cut-off Frequency (-3 dB) RMS Output Noise
Signal Outputs 301 302 303 304 305 306 401 402 403 404 Vout()mx Vout()d Isc()hi Isc()lo Ri() Vout() Isc()hi Isc()lo Ri() Permissible Maximum Output Voltage Dark Signal Level Short-Circuit Current hi Short-Circuit Current lo Internal Output Resistance Reference Voltage Short-Circuit Current hi Short-Circuit Current lo Internal Output Resistance 2.72 770 1.96 420 480 110 770 420 480 110 3.02 1000 2.35 800 700 180 1000 800 700 180 V mV V A A mV A A
Vout()acmx Maximum Signal Level
Signal References VRSC, VRDC
iC-PD3948
preliminary
Rev B4, Page 6/9
5-CHAN. PHASED ARRAY SINE ENCODER 39-2048
ELECTRICAL CHARACTERISTICS
Operating conditions: VCC = 4.5...5.5 V, Tj = -40..125 C, unless otherwise stated Item No. 501 502 503 504 Symbol Parameter Conditions Min. Vout() dVout() Isc()hi Isc()lo Reference Voltage Load Balancing Short-Circuit Current hi Short-Circuit Current lo I(VREF) = 0...+1.6 mA I(VREF) = 0...+1.6 mA current to ground current to IC 600 -10 200 2 420 4.5 Typ. 770 Max. 1000 +10 800 10 mV mV A mA Unit
Reference Voltages VREF
iC-PD3948
preliminary
Rev B4, Page 7/9
5-CHAN. PHASED ARRAY SINE ENCODER 39-2048
APPLICATION CIRCUITS
iC-MSB
Disc
iC-PD3948
iC-MSB
Figure 1: Application example motor feedback encoder
iC-MSB
Disc
iC-PD3948
Figure 2: Application example motor feedback encoder
iC-TW3
iC-PD3948
preliminary
Rev B4, Page 8/9
5-CHAN. PHASED ARRAY SINE ENCODER 39-2048
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-PD3948
preliminary
Rev B4, Page 9/9
5-CHAN. PHASED ARRAY SINE ENCODER 39-2048
ORDERING INFORMATION
Type iC-PD3948
Package 32-pin optoQFN, 5 mm x 5 mm x 0.9 mm (backside paddle exposed) 32-pin optoQFN 5 mm x 5 mm x 1.4 mm 15-pin optoBGA 6.2 mm x 5.2 mm
Options
Order Designation iC-PD3948 chip iC-PD3948 oQFN32-5x5
iC-PD3948 oQFN32-N5x5
iC-PD3948 oBGA LSH2C Code Disc 2048+1 PPR OD/ID 39/13 mm PD2S 39-2048
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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