MC100E183FN データシートの表示（PDF） - Motorola => Freescale

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MC100E183FN

TV AND VCR PLL TUNING CIRCUITS WITH 1.3 GHz PRESCALER AND I2C BUS

Motorola => Freescale 

MC44824/25

Figure 1. HF Sensitivity Test Circuit

ÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇ Bus Controller

I2C Bus

VCC

5.0 V VCC

SDA, SCL

MC44824/25

1.0 nF

HF

HF Gnd

B7 B2

HF Generator

HF Out Gnd

50 Ω Cable

1.0 nF

470 470

50 Ω

Frequency

Counter

In

VCC

Device is in test mode. B2 and B7 are “On”.

Sensitivity is level of HF generator on 50 Ω load.

Figure 2. Typical HF Input Impedance

–j +j

0

0.5

0.5

1.3 GHz

ZO = 50 Ω

1

1

1.0 GHz

2

2

500 MHz

50 MHz

0.5

1

2

Data Format and Bus Receiver

The circuit receives the information for tuning and control

via the I2C bus. The incoming information, consisting of a

chip address byte followed by two or four data bytes, is

treated in the I2C bus receiver. The definition of the

permissible bus protocol is shown below:

1_STA CA CO BA

2_STA CA FM FL

3_STA CA CO BA

STO

STO

FM FL

STO

4_STA CA FM FL CO BA STO

STA = Start Condition

STO = Stop Condition

CA = Chip Address Byte

CO = Data Byte for Control Information

BA = Band Information

FM = Data Byte for Frequency Information (MSB’s)

FL = Data Byte for Frequency Information (LSB’s)

4

MOTOROLA ANALOG IC DEVICE DATA

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