Philips FT18-TG, FT18-SG, FT18-IG Datasheet

IMAGE SENSORS
FT 18
Frame Transf er CCD Image Sensor
Product specification 2000 January 7 File under Image Sensors
Philips Semiconductors
TRAD
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18
1M active pixels (1024H x 1024V)
Progressive scan
Excellent anti-blooming
V ariable electr onic shuttering
Square pixel structure
Hor . and Vert. binning
100% optical fill factor
High dynamic range (>60dB)
High sensitivity
Low dark current and fixed pattern noise
Low read-out noise
Data rate up to 40 MHz
Frame rate up to 30 Hz
Mirrored read-out option

Device structure

Optical size: 7.68 mm (H) x 7.68 mm (V) Chip size: 8.9 mm (H) x 17.0 mm (V) Pixel size: 7.5 µm x 7.5 µm Active pixels: 1024 (H) x 1024 (V) Total no. of pixels: 1072 (H) x 1048 (V) Optical black pixels: Left: 20 Right: 20 Timing pixels: Left: 4 Right: 4 Dummy register cells: Left: 7 Right: 7 Contour lines: Bottom: 1 Top: 4 Optical black lines: Bottom: 11 Top: 8

Description

The FT 18 is a monochrome progressive-scan frame-transf er image sensor offering 1K x 1K pixels at 30 frames per second through a single output buffer . The combination of high speed and a high linear dynamic range (>10 true bits at room temperature without cooling) makes this device the perf ect solution f or high-end real time medical X-ray, scientific and industrial applications. A second output can be used for mirrored images. The device structure is shown in figure 1.
8 black lines
4 contour lines
8 black lines
Image
1024 active pixels
20
4
pix
Section
1 contour line
11 black lines
1024 active lines
20 pix
2096 lines
Figure 1 - Device structure
2000 January 2
Output amplifier
Storage
Section
7
1072 cells
Output register
7
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18

Architecture of the FT 18

The FT18 consists of a shielded storage section and an open image section. Both sections have the same structure with identical cells and properties. The only difference between the two sections is the optical light shield.
The storage section is controlled by four storage clocks (B1 to B4). An output register is located below the storage section for read-out. The output register has buffers at both ends . This allo ws either normal or mirrored read-out.
The optical centres of all pixels in the image section form a square grid. The charge is generated and integrated in this section. The image section is controlled by four image clocks (A1 to A4). After integration, the image charge is completely shifted to the storage section. The integration time is electronically controlled by charge reset (CR).
IMAGE SECTION
Image diagonal Aspect ratio Active image width x height Total width x height Pixel width x height Geometric fill factor Image clock pins Capacity of each clock phase Number of active lines Number of contour lines Number of black lines Total number of lines Number of active pixels per line Number of overscan (timing) pixels per line Number of black reference pixels per line Total number of pixels per line
10.9 mm 1:1
7.680 x 7.680 mm
8.040 x 7.860 mm
7.5 x 7.5 µm 100% A1, A2, A3, A4 <3.75nF per pin 1024 4 (top) + 1 (bottom) 8 (top) + 11 (bottom) 1048 1024 8 (2x4) 40 (2x20) 1072
Transport of the pixels in the output register is controlled by three register clock phases (C1 to C3). The register can be used for v ertical binning. Horizontal binning can be achieved by summing pixel charges under the floating diffusion. More information can be found in the application note. Figure 2 shows the detailed internal structure.
2
2
2
STORAGE SECTION
Storage width x height Cell width x height Storage clock phases Capacity of each B phase Number of cells per line x number of lines
8.040 x 7.860 mm
7.5 x 7.5 µm
2
B1, B2, B3, B4 <4.1nF per pin 1072 x 1048
OUTPUT REGISTER
Output buffers (three-stage source foll ower) Number of registers Number of register cells below storage Number of extra cells to output Output register horizontal transport clock pins Capacity of each C-clock phase Overlap capacity between neighbouring C-clocks Reset Gate clock phases Capacity of each RG
2 1 (bidirectional below storage) 1072 2 x 7 3 (C1..C3) <85pF per pin <35pF 2 pins (RGL, RGR) <15pF
2000 January 3
2
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18
A2 A3 A4
A1
A2 A3 A4
A1
A2
One Pixel
OUTL
C3 C3 C3C3 C3 C3 C3 C3 C3 C3 C3 C3
OG C1
C3
A3 A4
A1
A2 A3 A4
A1
A2 A3 A4
A1
A2 A3 A4
A1 B2
B3 B4
B1
B2
A1 B3 B4
B1 B2
B3 B4
B1
B2
A1 B3 B4
B1 B2
B3 B4 B3
B2
A1 B3 B4
B1
column
7 extra cells
20 black & 4 timing columns
12 lines
1K active
IMAGE
images lines
12 lines
FT CCD
STORAGE
1048 storage lines
C1C1C2 C2 C2 C1 C2 C1 C2C1
1
C2 C1 C2 C1 C2 C2C1 C1 C2 C1 C2 C1 C2
column
24+1
1K image pixels
column
24+1K
4 timing & 20 black columns
A2 A3 A4
A1
A2 A3 A4
A1
A2 A3 A4
A1
A2 A3 A4
A1
A2 A3 A4
A1
A2 A3 A4
A1 B2
B3 B4
B1
B2
A1 B3 B4
B1 B2
B3 B4
B1
B2
A1 B3 B4
B1 B2
B3 B4 B3
B2
A1A1 B3 B4
B1
column
24+1K+24
7 extra cells
OUTR
OG
C1
A1, A2, A3, A4: clocks of image section B1, B2, B3, B4: clocks of storage section C1, C2, C3: clocks of horizontal register OG: output gate
Figure 2 - Detailed internal structure
2000 January 4
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18

Specifications

Absolute Maximum Ratings Min. Max. Unit
GENERAL: storage temperature ambient temperature during operation voltage between any two gates DC current through any clock (absolute value) OUT current (no short circuit protections)
VOLTAGES IN RELAT ION TO VNS: VPS, SFS SFD RD All other pins
VOLTAGES IN RELAT ION TO VPS: VNS SFD, RD SFS All other pins
-55
-40
-20
-0.2 0
-30
-8
-15
-32
-0.5 +0
-8
-20
+80 +60 +20 +0.2 6
+0.5 +8 +0.5 +0.5
+30 +30 +8 +20
°C °C V µA mA
V V V V
V V V V
1
VNS VPS SFD SFS VCS OG RD
2
N substrate P substrate Source Follower Drain Source Follower Source Current Source Output Gate Reset Drain
DC Conditions
AC Clock Level Conditions
IMAGE CLOCKS: A-clock swing A-clock low level Charge Reset (CR) level on A-clocks
3
Charge Pump (CP) level on A- clocks STORAGE CLOCKS (duty cycle=5/8):
B-clock swing B-clock low level
OUTPUT REGISTER CLOCKS (duty cycle=1/2): C-clock swing C-clock low level
OTHER CLOCKS: Reset Gate (RG) swing Reset Gate (RG) low level
Min. Typical Max. Unit
16 2 18
-
-2 3 12
1
Min. Typical Max. Unit
9.5
-
-
-
9.5
-
-
-
-
-
adjusted 4 20 0 0
5.4 13
10 0
-5 0
10 0
5 3
10 1
24 6 22
­3 8 15
-
-
-
-
-
-
-
-
12
-
V V V V V V V
V V V V
V V
V V
V V
1
All voltages in relation to SFS.
2
To set the VNS voltage for optimal Vertical Anti-Blooming (VAB), it should be adjustable between minimum and maximum values.
3
Guaranteed charge reset requires the CR voltage to last at least 1.2µs.
2000 January 5
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18

Timing diagrams (for default operation)

AC Characteristics Min. Typical Max. Unit
Horizontal frequency (1/Tp) Vertical frequency
Line Timing
Phase or pixel count
-
-
1100 1110 1120 1130 1140 10 20 30 40 50 60 70 80 90 100 110 120
1/(36MHz) = 27.8ns
One charge pumping cycle of the image gates (during line blanking), shifting the charge of one line back and forth
H
A1
L H
A2
L H
A3
L H
A4
L
One cycle of the storage gates (during line blanking), moving one line from storage to output register
H
B2
L H
B3
L H
B4
L H
B1
L
H
SSC
Start-Stop C-clocks
L H
PB
Pre-Blanking
L H
BLC
Black Level Clamp
L H
CB
Composite Blanking
L H
Charge Reset
CR
L
1131 99
1150
0
19 64
28 37
46 55
32 62
26 44
38 56
20 50
0
C clocks stopped for 2 microseconds
0
0
19 64
1.25 microseconds
36 750
72
1080 pixels until 1152
79
79
40 833
MHz kHz
Pixel Timing
SSC
RG
Tp/6 = (1/36MHz)/6 = 4.63ns
dummy 1
. . . . . . .
dummy 7
black 1
H L H
C1
L H
C2
L H
C3
L H L
In this figure, charge is transported to the left output buffer (normal readout) by moving it from C1 to C2 to C3 etc. By exchanging the timing of C1 and C2, charge will be transported to the right output buffer (mirrored readout).
Tp = 1/36MHz = 27.8ns
. . . . . . .
black 20
timing 1
. . . . . . .
Figure 3 - Line and pixel timing diagrams
2000 January 6
timing 4
pixel 1
. . . . . . .
pixel 1024
timing 1
. . . . . . .
timing 4
black 1
. . . . . . .
black 20
dummy 1
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18
Frame Timing
Frame Transfer (FT):
internal
LINE
counter
1109 1110 1111 1112 1113 1114 1115 1116 1119 1120 1121 1122 ...... 1250 1 ...... 26 27 ...... 70 71 72 73 74 75 76 77 78 79 80 81 82 83 86 87
1024 D D B B BLC BLC B B D D E
line no.
SSC
BLC
Charge Pump (CP): a measure to reduce dark current due to interface states.
H
A1
L H
A2
L H
A3
L H
A4
L
Hustle: moving the charge packets of one line from storage to the output register.
H
B1
L H
B2
L H
B3
L H
B4
L
H L H
CR
L H L H
PB
L H
CB
L
For details see figure 3 "Line and pixel timing diagrams".
For details see figure 3 "Line and pixel timing diagrams".
Linetime: the C-clocks shift charge packets one-by-one to the selected output buffer.
...... ...... 88
For details see figure 3 "Line and pixel timing diagrams".
CR before nominal integration
Black-Level Clamp (BLC): the video processing clamps the black lines to determine its output zero-level.
charge image (all lines) is moved from image to storage by the image and storage clocks together (see Figure "Frame Shift Timing").
EEEEBBBLCBLCBBDDC C1video
By adding one CR-pulse during the horizontal blanking, the effective integration time is decreased: "electronic shuttering"
2
Frame Shift Timing
Tp=1/(36MHz) = 27.8ns
H
A1
L
H
A2
L
H
A3
L
H
A4
L
H
B1
L
H
B2
L
H
B3
L
H
B4
L
48 Tp 750kHz
1 2 1048
1 2 1048
30Tp
18Tp
for all A and B clocks,
duty cycle = 5/8
1047
1047
Figure 4 - Frame timing diagrams
2000 January 7
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18

Performance

The performance of the FT 18 is described for modes of operation with 25 frames/sec or 30 frames/sec respectively. Measurements for the FT 18 are done under the f ollo wing circumstances (values in brackets apply for the 30 frames/sec mode):
• VNS is adjusted as low as possible while maintaining proper Ver tical Anti-Blooming.
• Integration takes place under 2 gates with 10V clock s wing during 40ms (33.33ms)
Linear / Saturation Min. Typical Max. Unit
Overexposure over entire area while maintaining good VAB Vertical resolution (MTF) @ 67 lp/mm Quantum efficiency @ 450 nm Quantum efficiency @ 520 nm Quantum efficiency @ 600 nm Quantum efficiency @ 800 nm (near IR) Image lag White Shading Random Non-Uniformity (RNU)
1
2
Full-well capacity Floating Diffusion (FD) Full-well capacity saturation level (Q Full-well capacity saturation level (Q Full-well capacity saturation level (Q
) 3 image
max
) storage
max
) output register
max
4
25 frames/sec mode only
Sensitivity @ 3200K without IR cut-off filter Smear without shutter
5
Dynamic range RMS read-out noise
• The vertical transport or frame shift frequency equals 750kHz (714kHz).
• The horizontal transport or read-out frequency equals 36MHz (40MHz).
• The RMS read-out noise of the output buffers and the FPN are measured in the bandwidth 0.1-18MHz (0.1-20MHz).
• The performance in dark is given at a temperature of 318K / 45°C. Note that the dark current decreases by a factor of two for every decrease of temperature of approximately 10°C.
300 25 10 21 18 5
-
-
­120 40 45 90
5.6
­60
-
-
­11 22 19
­0
-
1.0
­45
-
-
5.8
-
63.8 29
-
-
-
-
-
-
-
2.5
1.4
-
-
-
-
-
0.39
­38
lux % % % % % % % % kel. kel. kel. kel.
kel/lux % dB el
30 frames/sec mode only
Sensitivity @ 3200K without IR cut-off filter Smear without shutter
5
Dynamic range RMS read-out noise
1
White Shading is defined as the ratio of the one-σ value of an 8x8 pixel blurred image (low-pass) to the mean signal value.
2
Random Non Uniformity is defined as the ratio of the one-σ value of the highpass image to the mean signal value at nominal light.
3
Q
is determined from the lowpass filtered image.
max
4
Q
of the output register may be increased up to 200kel. In this case the charge packets of the pixels may get mixed in the output register
max
during horizontal transport. This may reduce the number of times that the output register needs to be read out if lines are read out solely to be dumped.
5
The smear condition is: overexposure with a spot with a height of 10% of the image height (approx. 100 lines).
4.6
­60
-
4.8
-
63.5 30
-
0.40
­40
kel/lux % dB el
2000 January 8
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18
30
20
10
Quantum efficiency (%)
0
400 500 600 700 800 900
Wavelength (nm)
Figure 5 - Quantum efficiency versus wavelength
2000 January 9
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18
Output Buffers Min. Typical Max. Unit
Conversion factor Supply current Bandwidth Output impedance buffer (R
= 3.3k, C
load
Dark Condition Min. Typical Max. Unit
Dark current Black level offset
1
Dark condition at 25 frames/sec:
Average dark signal Shot noise of the dark current Horizontal shading Vertical shading Fixed Pattern Noise
2
in dark (FPN)
Dark condition at 30 frames/sec:
Average dark signal Shot noise of the dark current Horizontal shading Vertical shading Fixed Pattern Noise
2
in dark (FPN)
= 2pF)
load
8.5 10 4 110 400
-
-
-
-
-
-
-
-
-
-
-
-
-
-
56
-
-
-
-
47
-
-
-
-
11.5 µV/el. mA MHz
240 25
67 10 25 66 19
56 10 25 56 19
pA/cm el
el el el el el
el el el el el
2
1
Black level offset is defined as the difference in dark signal of a black refence line and an active image line.
2
FPN is the one-σ value of the highpass image.
2000 January 10
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18

Application information

Current handling
One of the purposes of VPS is to drain the holes that are generated during exposure of the sensor to light. Free electrons are either transported to the VRD connection and, if excessive (from over­exposure), free electrons are drained to VNS. No current should flow into any VPS connection of the sensor . During high ov erexposure a total current 10 to 15mA through all VPS connections together may be expected. The PNP emitter follower in the circuit diagram (figure 6) serves these current requirements.
VNS drains superfluous electrons as a result of overexposure. In other words, it only sinks current. During high overexposure a total current of 10 to 15mA through all VNS connections together ma y be expected. The NPN emitter follower in the circuit diagram meets these current requirements.
Decoupling of DC voltages
All DC voltages should be decoupled with a 100nF decoupling capacitor. This capacitor must be mounted as close as possible to the sensor pin. Further noise reduction (by bandwidth limiting) is achieved by the resistors in the connections between the sensor and its voltage supplies. The electrons that build up the charge packets that will reach the floating diffusions only add up to a small current, which will flow through VRD . Theref ore a large series resistor in the VRD connection may be used.
Outputs
T o limit the on-chip po wer dissipation, the output buff ers are designed with open source outputs. Outputs to be used should therefore be loaded with a current source or more simply with a resistance to GND. In order to prevent the output (which typically has an output impedance of about 400) from bandwidth limitation as a result of capacitive loading, load the output with an emitter follo wer b uilt from
a high-frequency transistor. Mount the base of this transistor as close as possible to the sensor and keep the connection between the emitter and the next stage short. The CCD output buffer can easily be destroyed by ESD. By using this emitter follower, this danger is suppressed; do NOT reintroduce this danger by measuring directly on the output pin of the sensor with an oscilloscope probe. Instead, measure on the output of the emitter follower. Slew rate limitation is prevented by avoiding a too-small quiescent current in the emitter follower; about 10mA should do the job. The collector of the emitter follower should be decoupled properly to suppress the Miller effect from the base-collector capacitance. A CCD output load resistor of 3.3k typically results in a bandwidth of 110MHz. The bandwidth can be enlarged to about 130MHz by using a resistor of 2.2k instead, which, however, also enlarges the on-chip power dissipation.
Device protection
The output buffers of the FT 18 are likely to be damaged if VPS rises above SFD or RD at any time. This danger is most realistic during power-on or power-off of the camera. The RD voltage should always be lower than the SFD voltage.
Never exceed the maximum output current. This may damage the device permanently. The maximum output current should be limited to 6mA. Be especially aware that the output buffers of these image sensors are very sensitive to ESD damage.
Because of the fact that our CCDs are built on an n-type substrate, we are dealing with some parasitic npn transistors. To avoid activ ation of these transistors during switch-on and switch-off of the camera, we recommend the application diagram of figure 6.
2000 January 11
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18

Device Handling

An image sensor is a MOS device which can be destroy ed by electro­static discharge (ESD). Therefore, the device should be handled with care.
Always store the de vice with short-circuiting clamps or on conductive foam. Alwa ys s witch off all electric signals when inserting or removing the sensor into or from a camera (the ESD protection in the CCD image sensor process is less effective than the ESD protection of standard CMOS circuits).
Being a high quality optical device, it is important that the cover glass remain undamaged. When handling the sensor , use fingercots.
VSFD
BC 850C
0.5-1mA
27
BAT74 Schottky!
15 BAT74 Schottky!
10k
BAT74 BC 850C
0.5-1mA
0.5-1mA
BC 860C
100nF
100nF
100nF
100nF
When cleaning the glass we recommend using ethanol (or possibly water). Use of other liquids is strongly discouraged:
• if the cleaning liquid evaporates too quickly, rubbing is likely to cause ESD damage.
• the cover glass and its coating can be damaged by other liquids.
Rub the window carefully and slowly. Dry rubbing of the window may cause electro-static charges or
scratches which can destroy the device.
keep short
VNS
SFD
VPS
VRD
<10mm! keep short!
10k
BFR 92A
output for preprocessing
10mA
OUT
VCS
VOG
100 Ω
3.3k
100nF
10k
100nF
100nF
1k
<7pF!
Figure 6 - Application diagram to protect the FT 18
2000 January 12
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18

Pin configuration

The FT18 is mounted in a ceramic DIL 32-pin package. The position of pin 1 is marked with a white dot on top of the package.
Pinning
Symbol Name Pin #
VNS VNS VPS VPS SFDL SFDR SFSL SFSR VCSL VCSR OGL OGR RDL RDR A1 A2 A3 A4 B1 B2 B3 B4 C1 C1 C2 C2 C3 C3 RGL RGR OUTL OUTR
N substrate N substrate P well P well Source Follower Drain Left Source Follower Drain Right Source Follower Source Left Source Follower Source Right Current Source Gate Left Current Source Gate Right Output Gate left Output Gate Right Reset Drain Left Reset Drain Right Image Clock (Phase 1) Image Clock (Phase 2) Image Clock (Phase 3) Image Clock (Phase 4) Storage Clock (Phase 1) Storage Clock (Phase 2) Storage Clock (Phase 3) Storage Clock (Phase 4) Register Clock (Phase 1) Register Clock (Phase 1) Register Clock (Phase 2) Register Clock (Phase 2) Register Clock (Phase 3) Register Clock (Phase 3) Reset Gate Left Reset Gate Right Output Left Output Right
12 21
5
28
9
24
8
25
7
26
6 27 11 22
3
4 30 29
1
2 32 31 14 19 15 18 16 17 13 20 10 23
2000 January 13
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
B1 B2 A1 A2 VPS OGL VCSL SFSL SFDL OUTL RDL VNS RGL C1 C2 C3
IMAGE
STORAGE
B4
B1
TOP
FT18
B3
32
B4
31
A3
30
A4
29
VPS
28
OGR
VCSR
SFSR
SFDR
OUTR
B4 B1
RDR
VNS
RGR
C1 C2 C3
27 26 25
24 23 22 21 20 19 18 17
Figure 7 - FT18 pin configuration (top view)
2000 January 14
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18

Pack age inf ormation

4.92 ±0.2
9.575 ±0.2
7.68 ±0.2
3.3 ±0.2
4.5 ±0.3
1.778 ±0.13
0.48 ±0.05
25.4 ±0.1
0.78 ±0.05
0.762 ±0.07
2.868 ±0.29
Image area
0.005
0.08 +0.07 -0.02
Glue
0.8 ±0.05
15.494 ±0.25
15.24 ±0.25 15 ±0.1
Cover glass
0.725 ±0.05
Crystal + Glue
7.747 ±0.2
Anti-reflex coating
1.4 / 100
3.317 ±0.2 B
1.016 ±0.10
Sensor crystal
1.090 ±0.11
0.25 +0.05 -0.02
1 / 100 B
2.986 ±0.29
0.665 ±0.07
29.70 ±0.3
Angle of rotation: less than ± 1
0
Sensor flatness: < 7 µm (P-V) Cover glass: Corning 7059
Thickness of cover glass: 0.8 ± 0.05 Refractive index: nd = 1.53 Single sided AR coating inside, 21% reflection (430-660 nm)
All drawing units are in mm.
Figure 8 - Mechanical drawing of the FT 18 package
2000 January 15
Philips Semiconductors Product specification
Frame Transfer CCD Image Sensor FT 18

Order codes

The sensor can be ordered using the following code:
FT18 sensors
Description Quality Grade Order Code
FT18/TG FT18/IG FT18/HG FT18/SG
You can contact the Image Sensors division of Philips Semiconductors at the following address:
Philips Semiconductors Image Sensors Internal Postbox WAG-05 Prof. Holstlaan 4 5656 AA Eindhoven The Netherlands
phone +31 - 40 - 27 44 400 fax +31 - 40 - 27 44 090
www.semiconductors.philips.com/imagers/
Test grade Industrial grade High grade Selected grade
9922 157 32031 9922 157 32021 9922 157 32011 9922 157 32001
Philips Semiconductors
Philips reserves the right to change any information contained herein without notice. All information furnished by Philips is believed to be accurate. © Philips Electronics N.V. 2000
lmtb
TRAD
9922 157 32001
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