GENERAL DESCRIPTION

The MSM7661B is an LSI device which converts digitally sampled NTSC or PAL video signals to 8-bit format based on ITU-RBT601.

The input video signals available are composite video signals and S video signals.

The composite video signals are converted to YUV data via a 2-dimensional Y/C separation circuit.

FEATURES (• indicates a new feature compared with MSM7660. ■ indicates a new feature compared with MSM7661.)

• Input video signals include the following two types of digital data that are A-to-D converted at pixel frequency or double pixel frequency :

NTSC/PAL composite video signal

NTSC/PAL S video signal

° 8-bit Y/8-bit C (CbCr) output (conforms to ITU-RBT601)

YCbCr 4 : 2 : 2

YCbC4 : 1 : 1

■ YCbCr 8-bit multiplex output (27 MHz) (not including SAV and EAV)

• 2-dimensional Y/C separation using adaptive comb filter (this filter is bypassed for S video signal input)

NTSC: 3 lines/2 lines

PAL: 2 lines (3 virtual lines)

• Input signal synchronization can lock synchronization and color burst at high speed through internal digital processing.

° Sampling frequency

13.5 MHz (ITU-R601)

12.27 MHz (NTSC Square Pixel)

14.31818 MHz (NTSC 4Fsc)

14.75 MHz (PAL Square Pixel)

• Internal AGC/ACC circuit

Switchable between AGC and MGC (fixed gain)

■ Switchable between ACC and MCC (fixed gain)

• Built-in decimation filter located in the input stage allows easy configuration of an external filter circuit (located ahead of A/D converter).

• Automatic NTSC/PAL recognition (only for ITU-RBT.601)

• Sleep mode

• Multiplex signal recognition (Teletext) Data during vertical blanking is output in 8 bits in Through mode.

° I2C-bus interface

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

• Package:

64-pin plastic QFP (QFP64-P-1414-0.80-BK) (Product name: MSM7661B GS-BK)