OLYMPUS C-700 UZ Description of Mechanism V1

H. DESCRIPTION OF MECHANISM

C-700 Ultra Zoom

H. DESCRIPTION OF MECHANISM

[1] CA1 CIRCUIT DESCRIPTION ................................................................................ H-2

[2] CA2 CIRCUIT DESCRIPTION ................................................................................ H-5

[3] ST1 POWER CIRCUIT DESCRIPTION ..................................................................H-7

[4] ST1 STROBE CIRCUIT DESCRIPTION................................................................. H-8

[5] SYA CIRCUIT DESCRIPTION ................................................................................ H-9

H-1 Ver.1

H. DESCRIPTION OF MECHANISM C-700 Ultra Zoom

[1] CA1 CIRCUIT DESCRIPTION

1. IC Configuration

IC903 (ICX284AK) CCD imager IC902 (74ACT04MTC) H driver IC904 (CXD3400N) V driver IC905 (AD9806) CDS, AGC, A/D converter

2. IC903 (CCD)

[Structure]

Interline type CCD image sensor

Optical size 1/2.7 type Effective pixels 1636 (H) X 1236 (V) Pixels in total 1688 (H) X 1248 (V) Optical black

Horizontal (H) direction: Front 4 pixels, Rear 48 pixels Vertical (V) direction: Front 10 pixels, Rear 2 pixels

Dummy bit number Horizontal : 28 Vertical :1

(only even number field)

Pin 1

(Note)

OUT

GND

Vertical register

SUB

GND

Cy Mg

Horizontal register

SUB

(Note) : Photo sensor

Pin 11

Fig. 1-1.Optical Black Location (Top View)

Pin No.

2, 3

5, 6

7, 10

Symbol

3A, Vφ3B

1A, Vφ1B

GND

OUT

VDD

SUB

Vertical register transfer clock

GND

Signal output

Circuit power

Substrate clock

Substrate bias

Protection transistor bias DC

Reset gate clock

Horizontal register transfer clock

Pin Description

Fig. 1-2. CCD Block Diagram

Waveform

GND 0 V

Voltage

-7.5 V, 0 V

-7.5 V, 0 V, 15 V

-7.5 V, 0 V

-7.5 V, 0 V, 15 V

Aprox. 10 V

15 V

Aprox. 8 V Aprox. 8V

(Different from every CCD)

12.5 V, 16 V

0 V, 3.3 V

Table 1-1. CCD Pin Description

H-2 Ver. 1

When sensor read-out

H. DESCRIPTION OF MECHANISMC-700 Ultra Zoom

3. IC902 (H Driver) and IC904 (V Driver)

An H driver (IC902) and V driver (IC904) are necessary in order to generate the clocks (vertical transfer clock, horizontal transfer clock and electronic shutter clock) which driver the CCD. IC902 is an inverter IC which drives the horizontal CCDs (H1 and H2). In addition the XV1-XV4 signals which are output from IC102 are the vertical transfer clocks, and the XSG1 and XSG signal which is output from IC102 is superimposed onto XV1 and XV3 at IC904 in order to generate a ternary pulse. In addition, the XSUB signal which is output from IC102 is used as the sweep pulse for the electronic shutter, and the RG signal which is output from IC102 is the reset gate clock.

4. IC905 (CDS, AGC Circuit and A/D Converter)

The video signal which is output from the CCD is input to Pins (26) and (27) of IC905. There are S/H blocks inside IC905 generated from the XSHP and XSHD pulses, and it is here that CDS (correlated double sampling) is carried out. After passing through the CDS circuit, the signal passes through the AGC amplifier. It is A/C converted internally into a 10-bit signal, and is then input to IC102 of the CA2 circuit board.

CCDIN

CLPDM

DAC1

DAC2

PBLK

0-34 dB

CDS

CLAMP

8B DAC 8B DAC

PGA

10B DAC

INTF

3-W INTF ADCIN

Fig. 1-5. IC905 Block Diagram

MUX

PGA

AUXIN

CLP B

CLP

S/H

0-15 dB

CLAMP

AD9806

ADC

REF

TIMING

GENERAT R

SHD

ADCCLK

SHP

DOUT

VRT VRB

GND

Fig. 1-3. IC902 Block Diagram

Input

Buffer

2 3 4 5 6 7 8

XSHT

XV3

XSG3B

XSG3A

XV1

XSG1B

XSG1A

XV4

XV2

SHT

V3B

V3A

V1B

V1A

GND

20 19

18 17 16

15 14 13 12 11

Ver. 1

Fig. 1-4. IC904 Block Diagram

H-3

H. DESCRIPTION OF MECHANISM C-700 Ultra Zoom

5. Transfer of Electric Charge by the Horizontal CCD

The transfer system for the horizontal CCD emplays a 2-phase drive method. The electric charges sent to the final stage of the horizontal CCD are transferred to the floating diffusion, as shown in Fig. 1-

6. RG is turned on by the timing in (1), and the floating diffusion is charged to the potential of PD. The RG is turned off by the timing in (2). In this condition, the floating diffusion is floated at high impedance. The H1 potential becomes shallow by the timing in (3), and the electric charge now moves to the floating diffusion. Here, the electric charges are converted into voltages at the rate of V = Q/C by the equivalent capacitance C of the floating diffusion. RG is then turned on again by the timing in (1) when the H1 potential becomes deep. Thus, the potential of the floating diffusion changes in proportion to the quantity of transferred electric charge, and becomes CCD output after being received by the source follower. The equivalent circuit for the output circuit is shown in Fig. 1-7.

(1)

H1 H2 H1 H2 H1 HOG RG

CCD OUT

Floating diffusion

(2)

H1 H2 H1 H2 H1 HOG RG

CCD OUT

(1) (2) (3)

3.5V 0V

13.5V 0V

(3)

H1 H2 H1 H2 H1 HOG RG

Reset gate pulse

Direction of transfer

H Register

Electric charge

Floating diffusion gate is floated at a high impedance.

CCD OUT

Fig. 1-6. Horizontal Transfer of CCD Imager and Extraction of Signal Voltage

The shutter hold signal(VCTRL) which is output from the

12V Pre-charge drain bias (PD)

ASIC (IC102) is restricted the shutter electric current. (maintenance electric current)

6-2. Iris drive

The iris stepping motor drive signals (ACTRL1, ACTRL2, ACTRL3 and ACTRL4) which are output from the ASIC (IC102) are used to drive by the motor driver (IC954). Detection of the standard iris positions is carried out by means

Voltage output

of the photointerruptor (PI2) inside the lens block.

6-3. Focus drive

The focus stepping motor drive signals (LDIN1, LDIN2, LDIN3

C is charged equivalently

and LDIN4) which are output from the ASIC expansion port (IC107) are used to drive by the motor driver (IC953). Detection of the standard focusing positions is carried out by means of the photointerruptor (PI) inside the lens block.

RG pulse leak signal

Signal voltage

Black level

Fig. 1-7. Theory of Signal Extraction Operation

6. Lens drive block

6-1. Shutter drive

The shutter drive signal (PCTRL) which is output from the ASIC expansion port (IC106) is drived the shutter constant level driver, and then shutter plunger is opened and closed.

6-4. Zoom drive

The zoom stepping motor drive signals (ZIN1, ZIN2, ZIN3 and ZIN4) which are output from the ASIC expansion port (IC107) are used to drive by the motor driver (IC953). Detection of the zoom positions is carried out by means of photoreflector (PR1 and PR2) inside the lens block.

H-4 Ver. 1

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