OKI MSM7652GS-2K Datasheet

Preliminary

¡ Semiconductor MSM7652

This version: Jun. 1998

¡ Semiconductor

MSM7652

NTSC/PAL Digital Video Encoder

GENERAL DESCRIPTION

The MSM7652 is a digital NTSC/PAL encoder. By inputting digital image data conforming to
ITU Rec. 656 or ITURBT 601, it outputs selected analog composite video signals, analog S video
signals or Y, R-Y, B-Y signals. For the scanning system, interlaced or noninterlaced mode can be
selected.
Since the MSM7652 is provided with pins dedicated to overlay function, text and graphics can
be superimposed on a video signal.
In addition, this encoder has an internal 10-bit DAC. So, when compared with using a conventional
analog encoder, the number of components, the board space, and points of adjustment can
greatly be reduced, thereby realizing a low cost and high-accuracy system.
The MSM7652 provides the optional functions such as Closed Caption Signal Generation
Function.
The host interface provided conforms to Philips's I2C specifications, which reduces
interconnections between this encoder and mounting components.
The internal synchronization signal generator (SSG) allows the MSM7652 to operate in master
mode.

FEATURES

• Video signal system: NTSC/PAL

• Scanning system: interlaced/noninterlaced (NTSC : 262 lines/PAL : 312 lines)

• Input digital level: conforms to ITU-R601 (CCIR601)

• Input-output timing: conforms to ITU Rec. 656 or ITURBT 624-4

• Input signal sampling ratio : Y:Cb:Cr = 4:2:2

• Supported input formats

· ITU Rec. 656

· YCbCr 27 MHz format (8-bit input)

· ITU-R601 13.5 MHz (8-bit (Y) + 8-bit (CbCr) input)

• Output video signals

· NTSC/PAL composite video signals and S video signals

· Y, R-Y, B-Y analog signals (selectable)

• Sampling frequency : 27 MHz

• Internal SSG circuit (Can operate as a master in other operation modes than CCIR Rec. 656
mode)

• Internal 3ch 10-bit DAC

• 3-bit title graphics can be displayed

• Color bar function

•I2C-bus host interface function

• 3.3 V single power supply (each I/O pin is 5 V tolerable)

• Closed caption function

• Package
56-pin plastic QFP (QFP56-P-910-0.65-2K) (Product name: MSM7652GS-2K)

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MSM7652 ¡ Semiconductor

APPLICATIONS

• Video CD

• Video game equipment

• Electronic still cameras

• Video file systems

• Video cameras

• Videophones

• Multimedia equipment

• Video printers

• Videoconferencing systems

• Scanners

• Video graphics boards

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¡ Semiconductor MSM7652

3

BLOCK DIAGRAM

Sync Generator & Timing Controller

Prologue

Block

I2C Control logic Test Control logic

IPF

Overlay
Control

YUV color
Generator

RESET_L

Black &

Blank Pedestal

Interpolator

+ LPF

Interpolator

+ LPF

Color Burst

Generator

Y Level

converter

U Level

converter

V Level

converter

Closed

Caption

Block

OLC

OLG
OLB

CD[7:0]

CLKX2

MODE

CLKX1O CLKSEL

SCL SDA

ADRS

Subcarrier

Generator

TENB TEST1

CVBSO (B-Y)

MSSEL[2:1]

BLANK_L

HSYNC_L

VSYNC_L

YD[7:0]

OLR

DAC

IPF

YA (Y)

DAC

IPF

IPF = Interpolation Filter

CA (R-Y)

DAC

VREF

FS

OUTSEL

COMP

MSM7652 ¡ Semiconductor

PIN CONFIGURATION (TOP VIEW)

DV

DD

MS

SDA

SCL

ADRS

RESET_L

MODE

OLC

OLR

OLG

10

DD

AGND

YA (Y)

AV

DGND
56

55

54

53

1

2

3

4

5

6

7

8

9

DD

AV

CVBSO (B-Y)
52

51

AGND

CA (R-Y)
50

49

COMP
48

FS
47

VREF
46

TENB
45

TEST1
44

DGND
43

42

41

40

39

38

37

36

35

34

33

DV

DD

SEL2

SEL1

CLKSEL

CD0

CD1

CD2

CD3

CD4

CD5

OLB

CLKX1O

OUTSEL

DV

DD

11

12

13

14

15

DGND

16

17

VSYNC_L

HSYNC_L

18

19

20

YD6

YD7

BLANK_L

NC : No-connection pin

56-Pin Plastic QFP

21

NC

22

YD5

23

YD4

24

YD3

25

YD2

26

YD1

27

YD0

32

31

30

29

28

DGND

CD6

CD7

CLKX2

DV

DD

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¡ Semiconductor MSM7652

PIN DESCRIPTIONS (1/2)

Pin I/O Symbol Description

1DV

DD

2IMS
3 I/O SDA I2C interface data bus
4 I SCL I

5 I ADRS

6 I RESET_L System reset signal. Negative porality
7 I MODE Broadcasting mode select pin. "0" : NTSC/"1" : PAL. Pulled down
8 I OLC

9 I OLR Overlay text color (Red component)
10 I OLG Overlay text color (Green component)
11 I OLB Overlay text color (Blue component)
12 O CLKX1O 13.5 MHz divided clock output signal

13 I OUTSEL

14 DV

DD

15 DGND Digital GND

16 I/O VSYNC_L

17 I/O HSYNC_L

18 I BLANK_L

19, 20 I YD7 to YD6

21 NC Not connected

22 to 27 I YD5 to YD0

28 DGND Digital GND
29 DV

DD

30 I CLKX2 Clock input pin (27 MHz)

31 to 38 I/O CD7 to CD0

39 I CLKSEL

3.3 V digital power supply
Selects between Master and Slave at 27 MHz or 13.5 MHz YCbCr operation. Pulled down

2

C interface clock bus

2

C-bus Slave address setting pin ("0" : 1000100 / "1" : 1000110).

I
Pulled down

Transparent control signal. "1" indicates overlay signal. Normally fixed to "0".

. Normally fixed to "0".

. Normally fixed to "0".

. Normally fixed to "0".

Video output signal format select pin. "0" : Y/C & Composite signal,
"1" : Y/B-Y/R-Y (component) signal. Pulled down

3.3 V digital power supply

Vertical sync signal input/output pin (ITU656: O, YCbCr: I/O)
Negative polarity
Horizontal signal input/output pin (ITU656 : O, YCbCr: I/O)
Negative polarity
Composite blank signal. Negative polarity. See the description on page 15
for the operating requirement.
MSB 2 bits of 8-bit digital image data input pins (for ITU656 and
YCbCr 27 MHz). Level conforms to ITU-601.
MSB 2 bits of 8-bit digital image luminance signal input pins (for YCbCr).
Level conforms to ITU-601.
YD7 is MSB.

LSB 6 bits of 8-bit digital image data input pins (for ITU656 and
YCbCr 27 MHz). Level conforms to ITU-601.
LSB 6 bits of 8-bit digital image luminance signal input pins (for YCbCr).
Level conforms to ITU-601.
YD0 is LSB.

3.3 V digital power supply

8bit digital image chrominance signal data input pins (13.5 MHz mode).
Level conforms to ITU-601. Fixed to "0" for ITU Rec. 656, 27 MHz-YCbCr mode.
Operation mode select pin. "0" : 27 MHz mode / "1" : 13.5 MHz mode.

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MSM7652 ¡ Semiconductor

PIN DESCRIPTIONS (2/2)

Pin I/O Symbol Description

40 I SEL1

Enable pin. Normally fixed to "0". Sleep mode "1" with TEST1 = "0"
(See Page 32 for details)

41 I SEL2

42 DV

DD

Pulled down

3.3 V digital power supply

43 DGND Digital GND

Interface select pin. ITU656 : "0", YCbCr 27 MHz : "1" (See Page 32 for details)

44 I TEST1

45 I TENB

Input pin1 for testing. Normally fixed to "0". (See Page 32 for details)
Pulled down

Input pin2 for testing.

Normally fixed to "0"

.

Pulled down

46 I/O VREF Reference voltage for DAC

47 I FS DAC full scale adjustment pin.

48 I COMP DAC phase complement pin.

49 AGND Analog GND

50 O CA

51 AV

DD

52 O CVBSO

Analog color chrominance signal output pin or component B-Y signal
output pin.

3.3 V analog power supply

Analog composite signal output pin or component R-Y signal output pin.
53 AGND Analog GND
54 O YA Analog luminance signal output pin or component Y signal output pin.
55 AV

DD

3.3 V analog power supply

56 DGND Digital GND

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¡ Semiconductor MSM7652

ABSOLUTE MAXIMUM RATINGS

Parameter

Power Supply Voltage

Input Voltage
Analog Output Current
Power Consumption
Storage Temperature

Symbol

DV

DD

AV

DD

V

I

I

O

P

W

T

STG

Condition

—
—
= 3.3 V

DV

DD

—
—
—

RECOMMENDED OPERATING CONDITIONS

Parameter

Power Supply Voltage (*1)

"H" Level Input Voltage
"L" Level Input Voltage
Operating Temperature 1 Ta1

Operating Temperature 2 Ta2

Symbol

DV

DD

AV

DD

V

IH

V

IL

Condition

—
—

—

—
DVDD = AVDD = 3.3 V
DVDD = AVDD = 3.3 V

DA output load = 37.5 W

Min.

3.0

3.0

2.2
—

0

Rating

Unit

–0.3 to +4.5

V

–0.3 to +4.5
–0.3 to +5.5

50

600

–55 to +150

Typ.

3.3

Max.

3.6

V

mA

mW

°C

Unit

V

3.3
—
—
25 ˚C

3.6
—

0.8
70

V
V

25 ˚C065

DVDD = AVDD = 3.3 V,

External Reference Voltage Vrefex

Ta = 25˚C

1.25 V——

DA Current Setting Resistance Riadj (*2) 385 W——
DA Output Load Resistance R

L

(*3) 75 W——

(*1) Supply an equal voltage to both DVDD and AVDD.
(*2) A volume control resistor of approx. 500 W is recommendable for adjusting the output

current. When a DA converter analog output is terminated with a 37.5 W load, Riadj
= approx. 192 W.

(*3) Indicates the value when Riadj = 385 W (typical value).

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MSM7652 ¡ Semiconductor

ELECTRICAL CHARACTERISTICS

DC Characteristics

(Ta = 0 to 70°C, DV

Parameter Symbol

"H" Level Output Voltage V

"L" Level Output Voltage V

Input Leak Current I
Output Leak Current I
Power Supply Current (operating) I

V

OH

OL

O

DDO

I

Condition

= –4 mA (*1)

I

OH

= 4 mA (*1)

I

OL

IOL = 6 mA (*2)

VI = GND to DV

DD

VI = GND to DVDD (*3)

— 120 mA— 140

= 3.3 V ±0.3 V, AVDD = 3.3 V ±0.3 V)

DD

Min.

0.7V

—

DD

Typ.

—

—V

Max.

—

0.4

— mA–10 +10
— mA–10 +10

Unit

RESET_L = "L"

Power Supply Current (standby) I

Power Supply Current (Sleep mode)

DDS

I

DDSM

I2 C-bus SDA Output Voltage SDAV
I2C-bus SDA Output Current SDAI

CLKX2 = 0 MHz

SEL2 = "H" 0.05 mA0.03 0.5

Low level, IOL = 3 mA

L

O

During Acknowledge

60 mA—65

—V0 0.4

—mA3—
Internal Reference Voltage Vrefin — 1.25 V——
DA Output Load Resistance R

L

—75W
Integral Linearity SINL — ±2 LSB
Differential Linearity SDNL — ±1 LSB

(*1) VSYNC_L, HSYNC_L, CD[7:0]
(*2) CLKX1O
(*3) SDA

AC Characteristics

Parameter Symbol Condition Min. Typ. Max. Unit

CLKX2 Cycle Time T
Input Data Setup Time
Input Data Hold Time
Output Delay Time
CLKX1O Delay Time

2

C-bus Clock Cycle Time t

I

2

C-bus High Level Cycle t

I

2

C-bus Low Level Cycle t

I

S

t

s1

t

h1

t

d1

t

d2

C_SCL

H_SCL

L_SCL

(Ta = 0 to 70°C, DV

—
—
—
—
—

Rpull_up = 4.7 kW

= 3.3 V ±0.3 V, AVDD = 3.3 V ±0.3 V)

DD

——

36.4 ns
7ns
5ns
525ns
525ns

200
100 —
100

—
—
—
—
——
—ns
——

—
—

nsRpull_up = 4.7 kW

nsRpull_up = 4.7 kW

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¡ Semiconductor MSM7652

INPUT/OUTPUT TIMING

Input timing

TS

CLKX2

ts1

td1

Invalid data

th1

valid data

HSYNC_L,

VSYNC_L, BLANK_L,

YD, CD, MS, MODE,

OLR, OLG, OLB, OLC

Output timing

HSYNC_L, VSYNC_L

CLKX1O

td2

I2C-bus Interface Input/Output Timing

The following figure shows I2C-bus basic input/output timing.

SDA

SCL

S

Start Condition

Data Line Stable: Data Valid

MSB

12 789

Change of Data Allowed

ACK

t

C_SCL

I2C-bus Basic Input/Output Timing

12

t

L_SCL

t

H_SCL

3-8

9

ACK

P

Stop Condition

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MSM7652 ¡ Semiconductor

BLOCK FUNCTIONAL DESCRIPTION

1. Prologue Block

This block separates input data at the ITU Rec.656 format into a luminance signal (Y) and a
chrominance signal (Cb & Cr), and also generates information concerning sync signals
HSYNC_L, VSYNC_L, and BLANK_L.
This block separates input data at the 27 MHz YCbCr (8-bit input) format into a luminance
signal (Y) and a chrominance signal (Cb & Cr).
This block separates input data at the 13.5 MHz YCbCr (16-bit input) format into a chrominance
signal Cb and a chrominance signal Cr.
Of the processed input data, luminance and chrominance signals other than valid pixel data
are replaced by 8'h10 and 8'h80 respectively.

2. Y Limiter Block

This block limits the luminance input signal by clipping the lower limit of an input signal outside
the ITU601 Standard

• Signals are limited to YD = 16 when YD < 16.

• Signals are limited to TD = 254 when YD (input during a valid pixel period) = 255.
In other cases, signals are fed as is to next processing.

3. C Limiter Block

This block limits the chrominance signal by clipping the upper and lower limits of the input
signal outside the ITU601 Standard.
CD = 1 when CD = 0 is input during a valid pixel period.
CD = 254 when CD = 255 is input during a valid pixel period.

• Y Level Converter

Converts ITU-601 standard luminance signal level to DAC digital input level.

• U Level Converter

Converts ITU-601 standard chrominance signal level to DAC digital input level.

• V Level Converter

Converts ITU-601 standard chrominance signal level to DAC digital input level.

• YUV Color Generator

This block generates luminance and chrominance signals from over lay color signals OLR,
OLG and OLB. Control signals (CR [2:0] ) control the output content (overlay or color bar) and
output level (100%, 75%, 50%, 25%).

• Overlay Control

This block selects input image data or YUV Color Generator output signals.
It is determined by the level of the control signal (OLC, CR [2]), as shown below: (x : don't care)
CR [2] = 1, OLC = x: Selects color bar signal (YUV Color Generator output signal).
CR [2] = 0, OLC = 1: Selects overlay signal (YUV Color Generator output signal).
CR [2] = 0, OLC = 0: Selects input image data.

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¡ Semiconductor MSM7652

• Black & Blank Pedestal

This block adds sync signals at the luminance side to luminance signals.

• Interpolator + LPF

This block executes data interpolation and the elimination of high frequency components by
LPF for input chrominance signals.

•I2C Control Logic

This is the serial interface block based on I2C standard of Phillips Corporation.
Internal registers MR and CR can be set from the master side.
When writing to the internal registers other than MR [1] (black level control) and CR [1:0]
(overlay level), written contents are immediately set to them. It is during the vertical blanking
period that written contents are set to MR [1] and CR [1:0].

• Sync Generator & Timing Controller

This block generates sync signals and control signals.
This block operates in slave mode, which performs external synchronization, and in master
mode, which internally generates sync signals.

• Color Burst Generator

Outputs U and V components of amplitude of burst signals.

• Subcarrier Generator

Executes color subcarrier generation.

• Interpolation Filter (IPF)

This block performs upsampling at CLKX2 for luminance signals and chrominance signals
modulated with CLKX1 divided from CLKX2. Interpolation processing is executed in this
process.

• Closed Caption Block

This block generates the signal for closed caption.

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