ic-lf x1 LINEAR IMAGE SENSOR
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1 Rev B1, Page 1/10 FEATURES 128 active photo pixels of 56 µm at a 63.5 µm pitch (400 DPI) Integrating L-V conversion followed by a sample & hold circuit High sensitivity and uniformity over wavelength High clockrates of up to 5 MHz Only 128 clocks required for readout Shutter function enables flexible integration times Glitch-free analogue output Push-pull output amplifier 5 V single supply operation Can run off external bias to reduce power consumption Pin-to-pin compatible with TSL1401 APPLICATIONS Optical line image sensors CCD substitute PACKAGES OLGA LF2C OBGA LF3C Die size (8.5 mm x 1.6 mm) BLOCK DIAGRAM VCC VDD TP CONTROL AND SHIFT REGISTER Sample and Hold Control NS Q C D NQ NS Q C D NQ Q C D NQ NR Q C D NQ NR Q C D NQ NR Bit 1 Bit 2 Bit 3 Bit 127 Bit 128 NRCI SNH RPIX(1:128) SNH128 DIS ACTIVE PIXELS Pixel 1 Pixel 2 Pixel 128 PIXOI PIXEI RSET ONE REF ic LF VHE VHO AO BIAS PIXEL MULTIPLEXER OUTPUT AMPLIFIER AGND GND Copyright 2008 ic-haus
2 Rev B1, Page 2/10 DESCRIPTION ic-lf1401 is an integrating light-to-voltage converter with a line of 128 pixels pitched at 63.5 µm (center-tocenter distance). Each pixel consists of a 56.4 µm x 200 µm photodiode and an integration capacitor with a sample-and-hold circuit. The integrated control logic makes operation very simple, with only a start and clock signal necessary. A third control input (DIS) enables the integration to be suspended at any time (electronic shutter). When the start signal is given hold mode is activated for all pixels simultaneously with the next leading clock edge; starting with pixel 1 the hold voltages are switched in sequence to the push-pull output amplifier. The second clock pulse resets all integration capacitors and the integration period starts again in the background during the output phase. A run is complete after 128 clock pulses. ic-lf1401 is suitable for high clock rates of up to 5 MHz. If this is not required the supply current can be reduced via the external bias setting (current into pin RSET).
3 Rev B1, Page 3/10 PACKAGES OLGA LF2C, OBGA LF3C PIN CONFIGURATION OLGA LF2C PIN FUNCTIONS No. Name Function 1 Start Integration Input 2 Clock Input 3 AO Analogue Output 4 VCC +5 V Supply Voltage 5 RSET Bias Current (connected to GND for internal bias = default; resistor from VCC to RSET for reduced current consumption) 6 AGND Analogue Ground 7 GND Digital Ground 8 DIS Hold Integration Input PIN CONFIGURATION OBGA LF3C CHIP LAYOUT Die size: 8.5 mm x 1.6 mm DIS GND AGND TP RSET pixel 1... pitch 63.5 um active area 56.4 um x 200 um... pixel 128 AO VDD VCC
4 Rev B1, Page 4/10 ABSOLUTE MAXIMUM RATINGS Beyond these values damage may occur; device operation is not guaranteed. Item Symbol Parameter Conditions Unit No. Min. Max. G001 VDD Digital Supply Voltage V G002 VCC Analog Supply Voltage V G003 V() Voltage at,, DIS, RSET, TP, AO -0.3 VCC G004 I() Current in RSET, TP, AO ma G005 Vd() ESD Susceptibility at all pins MIL-STD-883, Method 3015, HBM 100 pf discharged through 1.5 kω V 2 kv G006 Tj Operating Junction Temperature C G007 Ts Storage Temperature Range see package specification THERMAL DATA Operating Conditions: VCC = VDD = 5 V ±10 % Item Symbol Parameter Conditions Unit No. Min. Typ. Max. T01 Ta Operating Ambient Temperature Range see package specification (extended range on request) All voltages are referenced to ground unless otherwise stated. All currents into the device pins are positive; all currents out of the device pins are negative.
5 Rev B1, Page 5/10 ELECTRICAL CHARACTERISTICS Operating Conditions: VCC = VDD = 5 V ±10 %, RSET = GND, Tj = C unless otherwise noted Item Symbol Parameter Conditions Unit No. Min. Typ. Max. Total Device 001 VDD Digital Supply Voltage Range V 002 VCC Analog Supply Voltage Range V 003 I(VDD) Supply Current in VDD f() = 1 MHz µa 004 I(VCC) Supply Current in VCC 8 13 ma 005 Vc()hi Clamp Voltage hi at,,dis, TP, RSET 006 Vc()lo Clamp Voltage lo at,,dis, TP, RSET Vc()hi = V() V(VCC); I() = 1 ma V Vc()hi = V() V(AGND); I() = -1 ma V 007 Vc()hi Clamp Voltage hi at AO Vc()hi = V(AO) V(VCC); I(AO) = 1 ma V 008 Vc()lo Clamp Voltage lo at AO, VCC, VDD, GND Photodiode Array Vc()lo = V() V(AGND); I() = -1 ma V 201 A() Radiant Sensitive Area 200 µm x µm per Pixel mm² 202 S(λ)max Spectral Sensitivity λ = 680 nm 0.5 A/W 203 λar Spectral Application Range S(λar) = 0.25 x S(λ)max nm Analogue Output AO 301 Vs()lo Saturation Voltage lo I() = 1 ma 0.5 V 302 Vs()hi Saturation Voltage hi Vs()hi = VCC V(), I() = -1 ma 1 V 303 K Sensitivity λ = 680 nm, package OLGA LF2C 2.88 V/pWs 304 V0() Offset Voltage integration time 1 ms, no illumination mv 305 V0() Offset Voltage Deviation during integration mode 306 V() Signal Deviation during hold mode 307 tp(- AO) Settling Time V0() = V(AO)t1 V(AO)t2, t = t2 t1 = 1 ms V() = V(AO)t1 V(AO)t2, t = t2 t1 = 1 ms Cl(AO) = 10 pf, lo hi until V(AO) = 0.98 x V(VCC) mv mv 200 ns 308 PRNU Pixel Response Nonuniformity V(AO) = 2 V ±5 % 309 INL Integral Nonlinearity V(AO) = V ±1 % 310 V noise (AO) Output Noise Voltage V(AO) = 2 V 2 mv RMS 311 DR Dynamic Range V(AO) max = 3.5 V 62 db Power-On Reset 801 VCCon Power-On Release by VCC 4.4 V 802 VCCoff Power-Down Reset by VCC 1 V 803 VCChys Hysteresis VCChys = VCCon VCCoff V Bias Current Adjust RSET 901 Ibias() Permissible External Bias Current µa 902 Vref Reference Voltage I(RSET) = Ibias V Input Interface,, DIS B01 Vt()hi Threshold Voltage hi see Fig V B02 Vt()lo Threshold Voltage lo see Fig V B03 Vt()hys Hysteresis Vt()hys = Vt()hi Vt()lo, see Fig mv B04 I() Pull-Down Current µa B05 fclk Permissible Clock Frequency 5 MHz Projected values by sample characterization V (AO)max V 0(AO)max DR = 20 log V noise (AO)
6 Rev B1, Page 6/10 OPTICAL CHARACTERISTICS: Diagrams 100 % nm Figure 1: Relative spectral sensitivity OPERATING REQUIREMENTS: Logic Operating Conditions: VCC = VDD = 5 V ±10 %, Tj = C input levels lo = V, hi = 2.4 V...VCC, see Fig. 2 for reference levels Item Symbol Parameter Conditions Fig. Unit No. Min. Max. I001 tset Setup Time: stable before lo hi 3 50 ns I002 thold Hold Time: stable after lo hi 3 50 ns thold V 2.4V 2.0V 0.8V 0.45V Input/Output t 1 0 tset Figure 2: Reference levels Figure 3: Timing diagram
7 Rev B1, Page 7/10 DESCRIPTION OF FUNCTIONS Normal operation Following an internal power-on reset the integration and hold capacitors are discharged and the sample and hold circuit is set to sample mode. A high signal at and a rising edge at triggers a readout cycle and with it a new integration cycle. In this process the hold capacitors of pixels 1 to 127 are switched to hold mode immediately (SNH = 1), with pixel 128 (SNH128 = 1) following suit one clock pulse later. This special procedure allows all pixels to be read out with just 128 clock pulses. The integration capacitors are discharged by a one clock long reset signal (NRCI = 0) which occurs between the 2 nd and 3 rd falling edge of the readout clock pulse (cf. Figure 4). After the 127 pixels have been read out these are again set to sample mode (SNH = 0), likewise for pixel 128 one clock pulse later (SNH128 = 0) V(AO) Pix2 Pix SNH SNH128 NRCI integration time pixel integration time pixel 128 Figure 4: Readout cycle and integration sequence If prior to the 128 th clock pulse a high signal occurs at the present readout is halted and immediately reinitiated with pixel 1. In this instance the hold capacitors retain their old value i.e. hold mode prevails (SNH/SNH128 = 0) V(AO) Pix2 Pix3 Pix4 Pix5 Pix2 Pix3 Pix SNH SNH128 NRCI Figure 5: Restarting a readout cycle
8 Rev B1, Page 8/10 With more than 128 clock pulses until the next signal, pixel 1 is output without entering hold mode; the output voltage tracks the voltage of the pixel 1 integration capacitor V(AO) Pix2 Pix SNH SNH128 NRCI integration time Figure 6: Clock pulse continued without giving a new integration start signal Operation with the shutter function Integration can be suspended at any time via pin DIS, i.e. the photodiodes are disconnected from their corresponding integration capacitor when DIS is high and the current integration capacitor voltages are maintained. If this pin is open or switched to GND the pixel photocurrents are summed up by the integration capacitors until the next successive signal follows SNH NRCI DIS PIX SAMPLE C integration disabled integration enabled integration disabled Figure 7: Defining the integration time via shutter input DIS
9 Rev B1, Page 9/10 External bias current setting In order to reduce the power consumption of the device an external reference current can be supplied to pin RSET which reduces the maximum readout frequency, however. To this end a resistor must be connected from VCC to RSET. If this pin is not used, it should be connected to GND. This specification is for a newly developed product. ic-haus therefore reserves the right to change or update, without notice, any information contained herein, design and specification; and to discontinue or limit production or distribution of any product versions. Please contact ic-haus to ascertain the current data. 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.
10 Rev B1, Page 10/10 ORDERING INFORMATION Type Package Order Designation ic-lf OLGA LF2C ic-lf OLGA LF2C OBGA LF3C ic-lf OBGA LF3C - ic-lf chip For technical support, information about prices and terms of delivery please contact: ic-haus GmbH Tel.: +49 (61 35) Am Kuemmerling 18 Fax: +49 (61 35) D Bodenheim Web: GERMANY sales@ichaus.com Appointed local distributors:
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