Sharp LR38581 Datasheet

DESCRIPTION

The LR38581 is a CMOS timing generator IC which
generates timing pulses for driving 270 k/320 k­pixel color CCD area sensors with a dual-power­supply operation and processing pulses for color
video signals.

FEATURES

• Designed for 270 k/320 k-pixel color CCD area
sensors with a dual-power-supply-operation

• Switchable between NTSC and PAL modes

• Switchable between normal and mirror images

• Level shifter for readout and shutter pulses included

• +3.3 V, +5 V and +12.5 V power supplies

• Package :
48-pin QFP (QFP048-P-0707) 0.5 mm pin-pitch

PIN CONNECTIONS

LR38581

In the absence of confirmation by device specification sheets, SHARP takes no responsibility for any defects that may occur in equipment using any SHARP devices shown in
catalogs, data books, etc. Contact SHARP in order to obtain the latest device specification sheets before using any SHARP device.

1

LR38581

Timing Generator IC for 270 k/320 k-pixel

Color CCDs with Dual-power-supply Operation

1

48 47 46 45 44 43 42 41 40 39 37

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

2
3
4
5
6
7
8

9
10
11
12

36
35
34
33
32
31
30
29
28
27
26
25

OBCP

CLP

PBLK

FS

FCDS

RS

GND

V

DD3

ED0
ED1
ED2
MIR

SAD

2

SAD1
HP
VD
ADCK
GND
V

DD3

CDCK
SGCK
GND
CKO
CKI

TST1

TST2

VDD5

V1V2V3

V4

NC

GND

VTG

V

DD12

OFD

GND

FH

2B

FH2

FH1

VDD5

GND

FH1BFR

TVMD

PLCH

TST

4

38

TST3

48-PIN QFP

TOP VIEW

(QFP048-P-0707)

LR38581

2

BLOCK DIAGRAM

DECODER

& LATCH

SAD2

SAD1

HP

VD

ADCK

GND

V

DD3

CDCK

SGCK

GND

CKO

CKI

36 35 34 33 32 31 30 29 28 27 26 25

OFD

V

DD12

VTG

GND

NC

V

4

V2

V3

V1

VDD5

TST2

TST1

OBCP

CLP

PBLK

FS

FCDS

RS

GND

V

DD3

ED1

ED0

ED2

MIR

TST3

TST4

PLCH

TVMD

FR

FH

1B

GND

V

DD5

FH1

FH2

FH2B

GND

MIX 1/3

H COUNTER

LEVEL

SHIFTER

(12.5 V)

1/4 1/2PRESETRESET

OSC

13

14

15

16

17

18

19

20

21

22

23

24

123456789101112

48

47

46

45

44

43

42

41

40

39

38

37

V COUNTER

SHUTTER CONTROL

LEVEL

SHIFTER

LEVEL

SHIFTER

LR38581

3

PIN DESCRIPTION

PIN NO.

SYMBOL I/O

POLARITY

PIN NAME DESCRIPTION

1 OBCP O4MA3

Optical black clamp
pulse output

A pulse to clamp the optical black signal. This pulse stays
low during the absence of effective pixels within the vertical
blanking. The polarity can be changed by PLCH (pin 39).

2 CLP O4MA3

AD input signal
clamp pulse output

A pulse to clamp the AD input signal. The polarity can
be changed by PLCH (pin 39).

3 PBLK O4MA3

Pre-blanking pulse
output

A pulse that corresponds to the cease period of the
horizontal transfer pulse.

4 FS O4MA32 CDS pulse output 1

A pulse to sample-hold the signal from CCD.
The polarity can be changed by PLCH (pin 39).
The output phase of FS is selected by serial data.

5 FCDS O4MA32 CDS pulse output 2

A pulse to clamp the feed-through level from CCD.
The polarity can be changed by PLCH (pin 39).
The output phase of FCDS is selected by serial data.

6 RS O4MA32 S/H pulse output

A pulse to sample-hold the signal from CDS circuit.
The polarity can be changed by PLCH (pin 39).
The output phase of RS is selected by serial data.
A grounding pin.Ground–GND7–

–9ED

0 ICSU3

Shift register clock
input

An input pin for the clock of the shift register, to control
the functions of LR38581. For details, see "Serial Data

Control."

–8V

DD3 – Power supply Supply of +3.3 V power.

An input pin for the data of the shift register, to control
the functions of LR38581. For details, see "Serial Data

Control."

Shift register data
input

ICSU3ED

110 –

–11 ED

2 ICSU3

Strobe pulse input

An input pin for the strobe pulse, to control the functions
of LR38581. For details, see "Serial Data Control."
An input pin to select mirror or normal image mode

L level : Normal image mode
H level or open : Mirror image mode

Mirror mode
selection

ICU3MIR12 –

MIR

FH

1B

FH

2B

L (Normal mode)

∏ FH

1

∏ FH2 ∏ FH1

∏ FH2

H or open (Mirror mode)

–13 TST1 ICD5 Test pin 1 A test pin. Set open or to L level in the normal mode.

A test pin. Set open or to L level in the normal mode.Test pin 2ICD5TST214 –

–15 V

DD5 – Power supply Supply of +5 V power.

16 V

1 O4MA52

Vertical transfer
pulse output 1

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

V1 pin of CCD.

A pulse to drive vertical CCD shift register.
Connect to ØV3 pin of CCD.

Vertical transfer
pulse output 3

O4MA52V

318

A pulse to drive vertical CCD shift register.
Connect to ØV2 pin of CCD.

Vertical transfer
pulse output 2

O4MA52V

217