Rainbow Electronics TH7888A User Manual

AREA ARRAY CCD IMAGE SENSOR

1024 × 1024 PIXELS WITH ANTIBLOOMING

1024 x 1024 pixels with memory zone

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Up to 30 images / second

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Built-in antiblooming device providing

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an electronic shutter function.
Pixel : 14 mmx14mm

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Image zone : 14,34 x 14,34 mm²

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2 outputs at 20 MHz each

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Readout through 1 or 2 ouputs

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Possible binning2x2

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Optical shield against parasitic

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reflexions and stray light
A/R window in 400 - 700 nm bandwidth

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Optional integrated Peltier cooler

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Figure 1 : TH7888A organization

TH7888A

PIN IDENTIFICATION

Pin N° Symbol Designation

Y9 FP1
AA9 FP2
Y10 FP3

AA10 FP4

Y5 FM1
AA5 FM2

Y6 FM3
AA6 FM4

Y4 FM

B2 FL1

A2 FL2

A3 FL3

B3 FL4

B1 FL5

A1 FL6

A9 VDD1

A8 VDD2
B10 VS1

B8 VS2

B7 VDP

A6 VGS
A10 VOS1

B9 VOS2

B4 FR

Y7 FA

A7 VDR
AA7 VA

A4, A5, B5, B6 VSS

Y8, AA4, AA8 VSS

AA1, AA2 PELTIER+

Y1, Y2 PELTIER -

Y3 PT+

AA3 PT-

Image zone clocks

Memory zone clocks

Memory to register clock

Readout register clocks

Output amplifier drain supply
Output amplifier source

supply
Protection drain bias
Register output gate bias

Video outputs
Reset clock

Antiblooming gate clock
Reset bias
Antiblooming diode bias

Substrate bias
OPTIONAL

Peltier cooler power supply
NC otherwise

OPTIONAL
Temperature sensor
Pt 100W DIN43760
NC otherwise

November 1999 1/16

TH7888A

DESCRIPTION

TH7888A is especially designed for high data rate applications (up to 30 pict /s in 1024x1024 format progressive scan) in
medical and industrial fields.

This area array image sensor consists of a 1024 x 1024 pixels (14 mmx14mm) image zone associated to a memory zone
(masked with optical shield).

In order to increase data rate, it is provided 2 separate outputs that can be used for parallel readout. (readout frequency up
to 20 MHz / output leading to a total readout frequency of 40 MHz). These two outputs allow 3 readout modes (single or
dual port readout).

TH7888A is designed with antiblooming structure providing electronic shutter capability.
Moreover the2x2binning mode is available on this sensor. In that case, the image size is 512 x 512 with 28 mmx28mm

pixels.
TH7888A package is sealed with a specific anti-reflective window optimized in 400-700 nm spectrum bandwidth.
OPTIONS : the device can be delivered with integrated low power Peltier cooler in order to improve sensor performances in

high temperature environments (typically + 50°C).

FUNCTIONAL DIAGRAM

Figure 1 gives the general sensor organization.
Extra dark lines are provided for use as dark references or for smearing digital correction.
Extra dark pixels are provided for line dark reference clamping.
Each frame is made of 1056 video lines :

1 dummy line

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12 useful dark reference lines (with optical shield)

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3 isolation lines

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1024 useful lines

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n 3 isolation lines
n 12 dark reference lines (with optical shield)
n 1 dummy line

Each video line is made of 546 or 1058 elements, depending on readout mode (single or dual port modes):

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12 inactive prescan elements

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1 isolation element

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16 useful dark references (with optical shield)

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5 isolation elements

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512 or 1024 useful video pixels

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GEOMETRICAL CHARACTERISTICS

TH7888A

Figure 2b : Pixel layout

Figure 2c : Cross-section AA’

ABSOLUTE MAXIMUM RATINGS

Storage temperature ............................................................................................................................................-55°C to +150°C

Operating temperature...........................................................................................................................................-40°C to +85°C

Thermal cycling...............................................................................................................................................................15°C / mn

Maximum applied voltages :

Y9, AA9, Y10, AA10, Y5, AA5, Y6, AA6, Y4, B2, A2, A3, B3, B1, A1, B4, A6.................................................-0.3 to 15 V

A9, A8, B10, B8, B7, A7, AA7...........................................................................................................................-0.3 V to 15.5 V

Y7..............................................................................................................................................................................-0.3Vto12V

A4, A5, B5, B6, Y8, AA4, AA8 ..................................................................................................................................0V (ground)

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TH7888A

PELTIER OPTION

Storage temperature ..............................................................................................................................................-55°C to +85°C

Operating temperature...........................................................................................................................................-40°C to +70°C

Thermal cycling...............................................................................................................................................................10°C / mn

Maximum applied voltages :

PIN MAX VOLTAGE RANGE MAX CURRENT RANGE

AA1, AA2 with respect to Y1, Y2 5 V 1.8 A

Stresses above those listed under absolute maximum ratings may cause permanent device failure. Functionality at or abo­ve these limits is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability.

Operating range defines the limits whithin which the functionality is guaranteed.
Electrical limits of applied signals are given in operating conditions section

OPERATING PRECAUTIONS

Shorting the video outputs to any other pin, even temporarily, can permanently damage the on-chip output amplifier.

OPERATING CONDITIONS
TABLE1-DC CHARACTERISTICS

PARAMETER SYMBOL VALUE UNIT

Min. Typ. Max.

Output amplifier drain supply VDD1, VDD2 14.5 15 15.5 V
Protection drain bias VDP 14.5 15 15.5 V
Reset bias VDR 14.5 15 15.5 V
Antiblooming diode bias VA 14.5 15 15.5 V
Register output gate bias VGS 2.2 2.5 2.8 V
Output amplifier source supply VS1,2 0 V
Ground * VSS 0 V

OPTIONAL

Peltier power supply ** I
Voltage accross Peltier V
* Ground : note that the package metal back is internally grounded.

** Peltier power supply : conditions for 10°C sensor temperature with 50°C external temperature.

PELTIER

PELTIER

1.1 A
3V

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TH7888A

TIMING DIAGRAMS
Readout Mode

The serial readout register is operated in a two phase transfer mode. However, there are provided 6 separated command
electrodes that shall be connected differently depending on the required readout mode. The following table gives the con­nections to be made for each mode:

Readout modes Ü 1 output, VOS1 1 output, VOS2 2 outputs (parallel)
Drive clocks (signals) Þ (mirror effect)

FL1 pins B2, B3, B1 pins B2, A3, A1 pins B2, B3, A1
FL2 pins A2, A3, A1 pins A2, B3, B1 pins A2, A3, B1

The following diagrams are given for 20 MHz readout frequency, 1.25 MHz vertical transfer frequency

Figure 3 : Frame timing diagram

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