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Characteristic and use of NMOS linear image sensors
SD-26
TECHNICAL INFORMATION
Characteristic and use of
NMOS linear image sensors Contents
1. Introduction ....................................................................................................................... 4
2. Structure and basic operation ........................................................................................... 4
2-1. Structure ................................................................................................................................................. 4
2-2. Charge integration method .................................................................................................................... 4
2-3. Signal readout by shift register .............................................................................................................. 5
3. Sensor types and operation .............................................................................................. 5
3-1. Types of NMOS linear image sensors ................................................................................................... 5
3-2. Current output type NMOS linear image sensors ................................................................................. 6
3-2-1. Configurations ....................................................................................................................................................... 6
3-2-2. Operating principle of current output type ........................................................................................................... 7
3-2-3. Readout method for the current output types ...................................................................................................... 8
3-2-4. Terminal voltage for current output types ............................................................................................................ 9
3-2-5. Input/output pulse timing for current output type ............................................................................................... 11
3-3. Voltage output type NMOS linear image sensors ................................................................................ 12
3-3-1. Configurations of the voltage output types ........................................................................................................ 12
3-3-2. Operating principle of the voltage output types ................................................................................................. 13
3-3-3. Readout method for the voltage output types .................................................................................................... 13
3-3-4. Terminal voltage for the voltage output types .................................................................................................... 14
3-3-5. Input/output pulse timing for voltage output type ............................................................................................... 14
4. Characteristics ............................................................................................................... 16
4-1. Input/output characteristics .................................................................................................................. 16
4-1-1. Input/output characteristics (current output type) ............................................................................................. 16
4-1-2. Input/output characteristics (voltage output type) ............................................................................................. 16
4-2. Linearity error ........................................................................................................................................ 17
4-3. Spectral response characteristics ....................................................................................................... 17
4-4. Photoresponse non-uniformity ............................................................................................................ 18
4-5. Dark output ........................................................................................................................................... 18
4-6. Resolution ............................................................................................................................................ 20
4-7. Lag ........................................................................................................................................................ 21
4-8. Noise .................................................................................................................................................... 22
4-8-1. Random noise in current output type ................................................................................................................. 22
4-8-2. Random noise (voltage output type) .................................................................................................................. 23
4-9. Shift register frequency characteristics ................................................................................................ 24
4-10. Characteristic change by UV exposure .............................................................................................. 25
5. Precautions ..................................................................................................................... 26
5-1. Integration time setting ......................................................................................................................... 26
5-2. Output estimation ................................................................................................................................. 26
5-3. Light sources ........................................................................................................................................ 27
5-4. Positional accuracy of photosensitive area ......................................................................................... 27
5-5. Precautions during handling ................................................................................................................ 28
5-6. Precautions when configuring driver circuit boards ............................................................................ 29 6. Recommended driver circuits ......................................................................................... 30
6-1. Driver circuit for current output type ...................................................................................................... 30
6-1-1. Current-to-voltage conversion method .............................................................................................................. 30
6-1-2. External current-integration method ................................................................................................................... 34
6-2. Driver circuit for voltage output type image sensor .............................................................................. 39
6-3. Pulse generator .................................................................................................................................... 44
7. Standard driver circuits ................................................................................................... 45
7-1. Driver circuit configurations .................................................................................................................. 45
7-2. Driver circuit functions .......................................................................................................................... 45
7-3. Current-to-voltage conversion circuit C7883 series for current-output image sensor ....................... 49
7-3-1. Product lineup ..................................................................................................................................................... 49
7-3-2. Specifications ...................................................................................................................................................... 49
7-3-3. How C7883 series differs from recommended circuit ....................................................................................... 50
7-4. External current-integration circuit C7884 series for current-output image sensor ........................... 50
7-4-1. Product lineup ..................................................................................................................................................... 50
7-4-2. Specifications ...................................................................................................................................................... 50
7-4-3. How C7884 series differs from recommended circuit ....................................................................................... 51
7-5. Voltage-output image sensor driver circuit C7885 series ................................................................... 52
7-5-1. Product lineup ..........................................................................................................