MC44BS373CAD datasheet(22/52 Pages) MOTOROLA

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MC44BS373CA Data Sheet

MOTOROLA

MC44BS373CA Modes of Operation

15 MC44BS373CA Modes of Operation

15.1 Power-On Settings

At power on, the MC44BS373CA is configured as shown in Table 25 below.

15.2 Power Supply

The three device VCC pins (pins 10, 13 and 15 for SO16 package, pins 10, 15 and 17 for QFN20 package)

must be applied at the same time to ensure all internal blocks are correctly biased. Do not bias any other pin

before VCC is applied to the MC44BS373CA.

When all VCCs are switched to 0 V, the SDA and SCL pins are high impedance.

15.3 Standby Mode

During standby mode, the modulator is switched to low power consumption. That is, the sound oscillator,

UHF oscillator, and the video and sound modulator sections’ bias are internally turned off. The I2C bus

section remains active.

The MC44BS373CA can be set to standby mode with a combination of 3 bits: OSC = 1, SO = 1, and ATT = 1.

15.4 System L or B / G Selection

The SYSL pin can be used to switch the device between system L and system B/G, as summarized in

Table 26.

Table 25. Power-On Settings

WRITE MODE

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

ACK

C1-High order bits

10000000

ACK

C0-Low order bits

00001000

ACK

FM-High order bits

N11

N10

ACK

FL-Low order bits

ACK

Note:

N0 to N11 are set to have UHF oscillator on channel E36 (591.25 MHz). (See Section 15.7, “UHF PLL Section,” for

more information.) Peak white clip is on. Sound frequency is 5.5 MHz. Sound reference frequency is 31.25 kHz.

Logic output port is low voltage. Picture-to-sound ratio is 12 dB.

Table 26. System L or B/G Selection

Function

B/G (SYSL = 0)

L (SYSL = 1)

Video modulation polarity

Negative

Positive

Video modulation depth (% typical) 1

1 See Section 12, “Video Characteristics.”

Sound modulation

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