LC74950BG

No.A1647-2/37

Functions & Overview

1. Input

All the inputs listed below can be connected to the analog ports. It is also possible to switch between the inputs of

two systems and use the one selected.

YCbCr/YPbPr input (480I/576I, 480P/576P): Component input

RGB: RGB input

External clock supported

2. Output

Digital 8-bit/channel output

3. Clamp

Analog clamping and digital clamping supported

4. Gain

Digital gain adjustment

5. PLL circuit

This circuit can be used as the H lock or frequency-multiplied clock. It is also possible to use the PLL circuit and

analog-digital converter (ADC) independently.

H lock PLL circuit: This makes it possible to generate a clock synchronized with the external H sync signal.

Frequency-multiplier PLL circuit: This makes it possible to generate clocks synchronized with an external clock.

6. External interface

I

Slave addresses: 0x98, 0x9A

7. PDOWN

Power-down of the whole system can be controlled using the PDOWN pin. Alternatively, the ADC, PLL and other

circuits can be powered down separately using register settings. This makes it possible to limit the power as required.

Specifications

Absolute Maximum Ratings at Ta = 25

°C, DVSS = 0V, AVSS = 0V

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage (I/O)

DVDD33

AVDD33

-0.3 to +3.95

V

Maximum supply voltage (core)

DVDD15

AVDD15

-0.3 to +1.8

V

VI

-0.3 to +5.5

V

Digital input voltage

VI

(when in low voltage)

-0.3 to DVDD33+0.3

V

Digital output voltage

VO

-0.3 to DVDD33+0.3

V

Operating temperature

Topr

-30 to +70

°C

Storage temperature

Tstg

-55 to +125

°C

Allowable Operating Ranges at Ta = -30 to +70

°C

Ratings

Parameter

Symbol

Conditions

min

typ

max

unit

AVDD33

3.00

3.3

3.60

V

Max 40MHz

3.00

3.3

3.60

V

Supply voltage (I/O)

DVDD33

Max 30MHz

2.40

3.3

3.60

V

Supply voltage (I/O)

DVDD15

AVDD15

1.35

1.5

1.65

V

Input voltage range

(5V withstand voltage pin)

VIN5

0

5.5

V

Input voltage range

(non-5V withstand voltage pin)

VIN

0

3.9

V