PSD Signal processing circuit for 2-D PSD C4674, C4757, C4758, C7563 Signal processing circuit designed to facilitate operation of 2-D Position Sensitive Detector Features Applications l No complicated adjustment required Position measurement can be made simply by mounting 2-D PSD. l Output voltage directly representing the position data The position (mm) of a light spot from the PSD center is obtained as an output voltage (V). l Accurate position detection Accurate position data can be obtained, independent of light intensity. l Compact on-board configuration A head amplifiers, signal addition/subtraction circuits, and analog divider are mounted on a compact PC board. l Displacement measurements using 2-D PSD l Various studies using 2-D PSD l Evaluation of 2-D PSD ■ Four models are available to meet various 2-D PSD types PSD type DC signal processing circuit Pin-cushion type PSD C4674 Duo-lateral type PSD C4757 Tetra-lateral type PSD C4758 ● DC signal processing circuit Suitable for DC light displacement measurement. ● AC signal processing circuit Designed specifically for pulse (AC) signal detection. Has a synchronous circuit, S/H (sample & hold) circuit and LED driver circuit. Use of a pulse-driven LED ensures reliable operation even under background light. AC signal processing circuit C7563 - ■ Combination with Hamamatsu 2-D PSD Each signal processing circuit can be used with the following Hamamatsu 2-D PSD. Pin-cushion type PSD Signal processing circuit S1880 C4674 O C4757 C4758 C7563 O *1: Connected externally *2: Using attachment board S1881 O *1 S2044 O S5990-01 O *2 S5991-01 O Duo-lateral type Tetra-lateral type S1300 S1200 *2 O O O *1 O O *2 O *2 ■ Accessories The mating connectors to a power supply/signal readout device and the boards for mounting surface-mounting ceramic package PSD are supplied with each signal processing circuit. Accessory Type No. Supplied connector Attachment board C4674 HDEB-9S (made by Hirose Electric) for mounting S5990-01, S5991-01 C4757 C4758 HDAB-15S (made by Hirose Electric) C7563 for mounting S5990-01, S5991-01 1 C4674, C4757, C4758, C7563 Signal processing circuit for 2-D PSD ■ Absolute maximum ratings Parameter Signal processor LED driver Symbol Supply voltage Input current Output short-circuit time Operating temperature Transistor collector-emitter voltage Tra n sist or collector current * 3 Tra n sist or collector dissipatio n *3 Vcc Max. IIN Max. Topr V CE IC Pc C4674 - DC circuit C4757 C4758 ±18 Vcc Max. × 10-5 Continuous 0 to +50 - A C circuit C7563 +50 2 900 Unit V A s °C V A mW ■ Specifications (Ta=25 °C, Vcc= ±15 V) Sy mbol Parameter Typical value DC circuit C4757 C4758 1 × 105 100 Condition C4674 Signal processor LED driver Head-amp conversion impedance * 4 Feedback capacitance Rf Cf Input signal current *5 IIN Rise time tr PSD reverse bias voltage Output offset voltage VR VOS O utput voltage a m plitude * 6 Vo O utput noise (analog divider) Current consumption Transistor collector curre nt Repetition frequency Vn Icc Ic fT Output type - Factory setup prior to shipping Factory setup prior to shipping Photocurrent with PSD installed O utput resp ons e tim e versus m ov e m e nt of lig ht spot position, me asured with P S D installed. *7 With PSD installed and light spot falling on edge of active area. All ran g e * 7 *7 *3 *8 - AC circuit C7563 22 Unit V/A pF 1 × 10-5 to 1 × 10-4 A 30 µs +5 -10 to +10 V mV -10 to +10 V - 5 ±15 - - - - - 10 ±60 680 333 Open collector mVp-p mA mAp-p Hz - *3: Duty ratio: 3/100, pulse width: 90 µs, LED: Hamamatsu L1915-01 (sold separately) *4: These resistors are lead types and inserted into sockets, so it can be easily to exchange by the user if necessary in a range between 1 × 104 to 1 × 106 Ω. For more details, see the instruction manual that comes with the product. *5: The circuit does not operate correctly when input signal level is not appropriate. *6: Maximum output amplitude can be adjusted in a range of ±2 to ±10 V according to PSD type to be used. *7: Measured without PSD and with LED turned off, while using a current source of 20 µA (X1=X2=Y1=Y2) substituting for PSD photocurrent. In the case of C7563, however, pulse current with a duty ratio of 3/100 and a pulse width of 90 µs is supplied. *8: Repetition frequency 333 Hz (duty ratio: 3/100, pulse width: 90 µs) cannot be modulated. ■ Operating example (C4674) +V +15 V GND 0 V REGULATED POWER -15 V SUPPLY * -V 2-D PSD Y2 X2 VR Y1 X1 SIGNAL PROCESSING CIRCUIT C4674 3 5 4 1 2 Xout + GND - VOLTMETER Yout + GND - VOLTMETER Constant voltage power supply: ±15 V, Power capacity: 0.1 A Min. Ripple voltage: 3 mVp-p Max. Condition 1. Light source 2. Light spot diameter 3. PSD used 4. PSD photocurrent 5. Signal processing circuit 6. Frequency bandwidth 7. Voltmeter 2 LED (λ=900 nm) φ200 µm S1880 (12 × 12 mm) 10 µA C4674 10 Hz KEITHLEY model 195 A KPSDC0034ED The followings are obtained with the conditions listed on the left. Output voltage amplitude Position resolution (calculated values) VFS (X)=±6 V VFS (Y)=±6 V ∆x=0.1 µm approx. ∆y=0.1 µm approx. Signal processing circuit for 2-D PSD C4674, C4757, C4758, C7563 ■ 2-D PSD and output voltage Y2 OUTPUT VOLTAGE (Xout or Yout) (V) +L/2 +L/2 ACTIVE AREA 0 X2 X1 L × L mm 0 -L/2 -L/2 Y1 -L/2 +L/2 POSITION OF LIGHT SPOT (mm) -L/2 0 +L/2 KPSDC0032EB KPSDC0033EA Pin-cushion type Parameter S1880 S1881 * 9 S2044 S5990-01 S5991-01 Duo-lateral Tetra-lateral type type Unit S1300 S1200 Active area length L 12 22 4.7 4 9 Output voltage am plitude Vo (X) ±6 ±5.5 ±2.35 ±2 ±4.5 Output voltage am plitude Vo (Y) ±6 ±5.5 ±2.35 ±2 ±4.5 *9: The position (mm) of light spot from the center is twice the output voltage (V) for the S1881. 13 ±6.5 ±6.5 13 ±6.5 ±6.5 mm V V If the incident light spot is not sufficiently focused on the PSD, i.e., the light spot diameter is large, and falls upon near the edge of the active area, part of the light spot may go outside the active area, thus degrading position accuracy. The output voltage amplitude values listed above are measured when the light spot diameter is made as small as possible within the range in which adequate intensity is maintained. ■ Dimensional outline (unit: mm, tolerance: ±0.2 mm) b 2 b 2 b THROUGH HOLES FOR EXTERNALLY CONNECTED PSD 20 d c PSD * a CENTER OF MOUNTED PSD (4 ×) 3.2 D-SUB CONNECTOR 15.5 MAX. Symbol a b c d C4674 90 65 84 59 C4757 92 70 84 62 C4758 90 65 83 57 * PSD is not mounted on this board. C7563 110 75 102 67 KPSDA0018EC Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2003 Hamamatsu Photonics K.K. HAMAMATSU PHOTONICS K.K., Solid State Division 1126-1 Ichino-cho, Hamamatsu City, 435-8558 Japan, Telephone: (81) 053-434-3311, Fax: (81) 053-434-5184, http://www.hamamatsu.com U.S.A.: Hamamatsu Corporation: 360 Foothill Road, P.O.Box 6910, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: (1) 908-231-0960, Fax: (1) 908-231-1218 Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49) 08152-3750, Fax: (49) 08152-2658 France: Hamamatsu Photonics France S.A.R.L.: 8, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: 33-(1) 69 53 71 00, Fax: 33-(1) 69 53 71 10 United Kingdom: Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire AL7 1BW, United Kingdom, Telephone: (44) 1707-294888, Fax: (44) 1707-325777 North Europe: Hamamatsu Photonics Norden AB: Smidesvägen 12, SE-171 41 Solna, Sweden, Telephone: (46) 8-509-031-00, Fax: (46) 8-509-031-01 Cat. No. KPSD1005E06 Italy: Hamamatsu Photonics Italia S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: (39) 02-935-81-733, Fax: (39) 02-935-81-741 Apr. 2003 DN 3