Sharp LR36685 Datasheet

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1

DESCRIPTION

The LR36685 is a CMOS vertical clock driver and
shutter driver IC for CCD area sensors which
provides the functions to convert the voltage and
impedance from the CMOS level.

FEATURES

• Built-in seven circuits
– 2-level output :

2 circuits for vertical CCD clock driver
Output voltage level (TYP.) = –9 to 0 V

– 3-level output :

4 circuits for vertical CCD clock driver
Output voltage level (TYP.) = –9 to 0 to +15 V

– 2-level output :

1 circuit for shutter driver
Output voltage level (TYP.) = –9 to +17 V

• Switchable between NTSC (EIA) and PAL (CCIR)
modes

• Package :
24-pin SSOP (SSOP024-P-0275)

PIN CONNECTIONS

LR36685

LR36685

Vertical Driver IC for

CCD Area Sensors

POFD

VH

1BX

1

24
23
22
21
20
19
18
17
16
15
14
13

VMb

V4X

2

VL

VH3AX

3

V2

GND

4

V4

VDD

5

NC

V

3X

6

V3B

VH1AX

7

V3A

V1X

8

V1B

V2X

9

V1A

OFDX

10

VMa

VH3BX

11

VH

VOFDH

12

24-PIN SSOP

TOP VIEW

(SSOP024-P-0275)

LR36685

2

BLOCK DIAGRAM

VOFDH

VH3BX

OFDX

V

2X

V1X

VH1AX

V3X

VDD

GND

VH

3AX

V4X

VH1BX

POFD

V

Mb

VL

V2

V4

NC

V

3B

V3A

V1B

V1A

VMa

VH

MIX

MIX

MIX

MIX

24

23

22

21

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

9

10

11

12

LR36685

3

PIN DESCRIPTION

16 GND Ground A grounding pin.

PIN NO.

SYMBOL PIN NAME DESCRIPTION

1 POFD OFD pulse output

An electronic shutter pulse output.
(high level = V

OFDH, low level = VL)

2VMb Power supply A power supply for high level of V2 and V4.
3V

L Power supply A power supply for low level of all output pulses.

4V

2

Vertical transfer
pulse output 2

A pulse to drive vertical CCD shift register.
Connect to Ø

V2.

5V

4

Vertical transfer
pulse output 4

A pulse to drive vertical CCD shift register.
Connect to Ø

V4.

6 NC No connection No connection

A pulse to drive vertical CCD shift register.
Connect to Ø

V3B.

Vertical transfer
pulse output 3B

V

3B7

9V

1B

Vertical transfer
pulse output 1B

A pulse to drive vertical CCD shift register.
Connect to ØV1B.

8V

3A

Vertical transfer
pulse output 3A

A pulse to drive vertical CCD shift register.
Connect to Ø

V3A.

A pulse to drive vertical CCD shift register.
Connect to Ø

V1A.

Vertical transfer
pulse output 1A

V

1A10

11 V

Ma Power supply

A power supply for intermediate level of V

1A, V1B, V3A

and V3B.
A power supply for high level of V1A, V1B, V3A and V3B.Power supplyVH12

13 VH

1BX

Readout pulse input1BA pulse that transfers the charge of the photo-diode to

the vertical shift register.

A vertical transfer pulse input.

Vertical transfer
pulse input 4

V

4X14

15 VH

3AX

Readout pulse input3AA pulse that transfers the charge of the photo-diode to

the vertical shift register.

A vertical transfer pulse input.

Vertical transfer
pulse input 3

V

3X18

A power supply for input pulses.Power supplyV

DD17

19 VH

1AX

Readout pulse input1AA pulse that transfers the charge of the photo-diode to

the vertical shift register.

A vertical transfer pulse input.

Vertical transfer
pulse input 1

V

1X20

22 OFDX OFD pulse input An electronic shutter pulse input.

21 V

2X

Vertical transfer
pulse input 2

A vertical transfer pulse input.

A pulse that transfers the charge of the photo-diode to
the vertical shift register.

Readout pulse input
3B

VH

3BX23

24 V

OFDH Power supply A power supply for high level of POFD.