MOTOROLA MC44BC373, MC44BC374 User Manual

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Technical Data

MC44BC373/374 Rev. 3.5, 7/2003

Freescale Semiconductor, Inc.

MC44BC373/374 Multi-Standard or PAL/ NTSC Modulator with integrated antenna booster/splitter ICs

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Contents

1 Features . . . . . . . . . . . . . 2

2 Device Overview . . . . . . 3

3 Maximum Ratings . . . . . 5

4 Electrostatic Discharge 5 5Electrical

Characteristics 5

C Bit Mapping . . . . . . . 6

C Programming . . . . . 7

8 Modulator High

Frequency

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Characteristics 9 9 Video Characteristics . 10 10 Audio Characteristics . 11 11 Antenna Booster/Splitter

Characteristics 12 12 Modulator Operation . 14 13 High-Speed I

Compatible Bus 18 14 Application and

Case Diagrams 21

MC44BC373/374

TSSOP 24 Package

Ordering Information

Device Temp Range Package

MC44BC373DTB,R2 MC44BC374DTB,R2

NOTE: For tape and reel, add R2 suffix.

These modulator ICs are for use in VCRs, games, set-top boxes, and similar devices. Figure 1 shows the pin connections.

SCL

SDA

LOP

XTAL

GND

ANT1

ANT2

GND

PREEM

AUDIO

SPLFLT

AUXIN

GNDD

VCCD

PLLFLT

TVOVCC

TVOUT

GND

VCRTU

VCRVCC

VCCA

VIDEO

VCCI

–10

C to +80oC

TSSOP24

Figure 1. MC44BC373/374 Pin Connections

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Features

Freescale Semiconductor, Inc.

1 Features

MC44BC373: Multi-Standard PAL/SECAM/NTSC with integrated booster splitter MC44BC374: PAL/NTSC with integrated booster splitter

The channel is set by an on-chip high-speed I the modula tor o v er th e full UHF range. The modulator incorporates a sound subcarrier oscillator and uses a second PLL to derive 4.5, 5.5, 6.0, and 6.5MHz subcarrier frequencies. These frequencies are selected using the bus.

The picture-to-sou nd ratio is adjus ted using the bu s. In addi tion, an on-chip v ideo test patter n generat or can be switched ON using a 1kHz audio test signal.

Along with the modulator functions, an Antenna Booster/Splitter function is included. These modulator versions are comple tely pin-to-pin and software compatible and all versions have the

following fe atures.

• No external varicaps diodes /inductors or tuned components

C compatible bus receiver. A Phase-Locked Loop (PLL) tunes

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• Channel 21–69 UHF operation

• VHF range possible by internal dividers (30MHz to 450MHz)

• Integrated on-chip programmable UHF oscillator

• Extremely low external component count

• High-speed read and write I

• Fixed video modulation depth (80% in PAL and 90% in SECAM)

• Peak White Clip disabled using the bus

• Programmable picture/sound carrier ratio (12dB and 16dB)

• Integrated on-chip programmable sound subcarrier oscillator

(4.5MHz to 6.5MHz)—No external varicaps

• On-chip video test pattern generator with sound test signal (1kHz)

• Low-power programmable modulator standby mode (booster active)

• Transient output inhibit during PLL Lock-up at Power-ON

• Logical Output Port controlled by bus

• Integrated Antenna Booster/Splitter (40MHz to 860MHz)

• Custom masked versions with unique start-up settings possible

C bus programming required)

(no I

C-bus compatible (800kHz)

• Extremely robust ESD protection, minimum 4kV, typical 6kV

2 MC44BC373/374 Technical Data MOTOROLA

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2 Device Overview

Figure 2 shows a simplified block diagram of the MC44BC373/4 device. The MC44BC373/374 device contains four main sections:

Device Overview

1. A high-speed I

2. A PLL section — Synthesizes the UHF/VHF output channel frequency (from an integrat ed UHF oscillator, divided for VHF output).

3. A modulator section — Accepts audio and video inputs and then uses those inputs to modulate the UHF/VHF carrier.

4. An Antenna Booster/Splitter — Am plifies and splits the antenna signal into two signals: a) The modulated signal is added to the amplified antenna signal on the TVOUT pin. a)

The following items are programmable using the high-speed I

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• Channel frequency

• Sound frequency

• Sound/picture carrier ratio

An on-chip video test pattern generator with an audio test signal is included. The MC44BC373 operates as a multi-standard modulator and can handle the following systems using the

same external circuit components:

•B/G

•I

•D/K

•H

•L

•M/N

The high frequency BiCMOS technology permits integration of the following functions:

• Antenna Booster/Splitter

• UHF tank circuit and certain filtering

C-compatible bus section.

C compatible bus:

Frees

MOTOROLA MC44BC373/374 Technical Data 3

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Device Overview

Freescale Semiconductor, Inc.

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LOP VIDEO SPLLFLT

AUDIO

SECTION

MODULATOR

Clamp

kHz

31.25

Peak

White

L/BG

Video

C BUS

BST

SECTION

Modulator

Ω

Sound

PREEM

Audio

Amplifier

and FM

Oscillator

PFD

Sound

L/BG

Modulator

Prog

LPF

I2C BUS

Ω

ALCLPF

Divider

C BUS

LPF

VCCA

4dB

L/BG

AM Modulator

Sound

AUX IN

31.25kHz

C BUS I

23 24

XTALPLLFLTGNDDVCCD

XCO

4MHz

/128

Ref Divider

VCO and PLL SECTION

PLL

UHF OSC

VHF Dividers

Modulator

C BUS

BUS SECTION

High-Speed

Comp

Phase

Prog

Divider

Prescaler/ 8

C Bus

Receiver

GND

Figure 2. Simplified Block Diagram—MC44BC373 / 374

4 MC44BC373/374 Technical Data MOTOROLA

VCCI

TVOUT

TVOVCC

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VCRTU

ANT2

ANT1

SCL

SDA

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Maximum Ratings

3 Maximum Ratings

Sym Parameter Value Unit

Vcc1 Supply Voltage 6 V

Tamin Minimum Operating Ambient Temperature –10

Tamax Maximum Operating Ambient Temperature 75

Tstgmin Minimum Storage Temperature –65

Tstgmax Maximum Storage Temperature 150

This device contains protection circuitry to guard against damage due to high static voltage or electric fields. However, precautions must be taken to avoid applications of any

voltage higher than maximum rated voltages to this high impedance circuit. For proper

operation, input and output voltages should be constrained to the ranges indicated in the

Recommended Operating Conditions.

Maximum ratings are those values beyond which damage to the device may occur. For functional operation, voltage should be restricted to the Recommended Operating Condition.

4 Electrostatic Discharge

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Sym Parameter Min Typ Unit

ESD HBM (Human Body Model)—MIL-STD-883C, Method 3015-7 4000 6000 V

5 Electrical Characteristics

• A = 100% Tested

• B = 100% Correlation tested

• C = Characterized on samples

• D = Design parameter

5.1 Specification Conditions

Unless otherwise stated: Vcc=5.0V, Ambient Temperature=25oC, Video Input 1V grayscale. RF inputs/outputs into 75Ohm load. SPECIFICATIONS ONLY VALID FOR ENVELOPE DEMODULATION.

Parameter Min Typ Max Unit Notes Type

Operating supply voltage range 4.55.05.5V B

Total supply current 65 75 88 All sections active A

Total standby mode supply current 26 34 40 mA

Test pattern sync pulse width 3 4.76.5 µSB

Sound comparator charge pump current

During locking When locked

RF comparator charge pump current 60 100 150 µAA

Crystal oscillator stability-negative resistance 1 ——KΩ D

Logic Output Port

Saturation voltage at I=2 mA Leakage current

10112

0.7

——160—3001mV

1.5µAµA

OSC, SO, ATT= 1 Bus Section active

µA

, 10-step

p-p

A A

MOTOROLA MC44BC373/374 Technical Data 5

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C Bit Mapping

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6 I2C Bit Mapping

WRITE MODE Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ACK

CA-CHIP ADDRESS 11001010ACK

C1-High Order Bits 1 AUX SO LOP PS X3 X2 SYSL ACK

C0-Low Order Bits PWC OSC ATT SFD1 SFD0 TB1 X5 X4 ACK

FM-High Order Bits 0 TPEN N11 N10 N9 N8 N7 N6 ACK

FL-Low Order Bits N5 N4 N3 N2 N1 N0 X1 X0 ACK

READ MODE Bit 7Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0ACK

CHIP ADDRESS 11001011ACK

R-Status Byte —————Y2 Y1 OOR —

Bit Name Description

PWC Peak White Clip enable / disable.

OSC UHF oscillator ON/OFF.

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ATT Modulator output attenuated-sound and video modulators ON/OFF.

SFD0, 1 Sound subcarrier frequency control bits.

TB1 Test mode bit—bus format compatible with MC44353.

AUX Auxiliary sound input enable/disable.

SO Sound Oscillator ON/OFF.

LOP Logic Output Port.

PS Picture-to-Sound carrier ratio.

SYSL System L enable—selects AM sound and positive video modulation ( MC44BC373/ only).

TPEN Test pattern enable—picture and sound.

X5…X0 Test mode bits—All bits are 0 for normal operation (see Test Mode tables, page 7 & page 8).

N0…N11 UHF frequency programming bits, in steps of 250kHz.

OOR RF oscillator out-of-frequency range information.

Y1, Y2 RF oscillator operating range information.

Frees

6 MC44BC373/374 Technical Data MOTOROLA

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7 I2C Programming

I2C Programming

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Sound

SFD1 SFD0 Sound Subcarrier Freq (MHz)

00 4.5

01 5.5

10 6.0

11 6.5

PS Picture-to-Sound Ratio (dB)

012

116

UHF

OSC UHF Oscillator

0 Normal operation.

UHF oscillator disabled ( oscillator and PLL

sections bias turned OFF ).

ATT Modulator Output Attenuation

0 Normal operation.

Modulator output attenuation (sound and

video modulators sections bias turned OFF ).

Standby Mode

SO Sound Oscillator

0 Sound oscillator ON (normal mode).

Sound oscillation disabled (oscillator and PLL

section bias turned OFF).

AUX Auxiliary Audio Input

0 AUX input disabled (normal mode).

1 AUX input enabled.

OSC SO ATT Combination of 3-bits

111

MC44353/4/5 Compatibility

Video

TB1 Description

SYSL

System B/ G enabled, System L disabled

(FM sound and negative video modulation).

System L enabled, System B / G disabled

(AM sound and positive video modulation).

PWC Peak White Clip

0 Peak White Clip ON (System B/G).

1 Peak White Clip OFF (System L).

TPEN Test Pattern Signal

0 Test pattern signal OFF (normal operation).

System L and B/ G Selection

MC44BC373 only

0 Normal mode (fully programmable).

Limited programmability and compatibility with

MC44353.

Logic Output Port

LOP Description

0 Pin 3 is low voltage.

1 Pin 3 is high impedance.

WRITE MODE: Test Mode 1 and VHF Range

X2 X1 X0 State Description

Modulator standby mode (sound and UHF oscillator, sound and video modulator section bias turned OFF, and I standby mode)—BST is active.

C bus section

0001.a Normal operation.

0011.b RF frequency divided for low frequency testing or VHF range: RF/ 2

0101.cRF/4

0111.dRF/8

1001.eRF/16

1011.f DC drive applied to modulators: non-inverted video at TVOUT.

1101.g DC drive applied to modulators: inverted video at TVOUT.

1111.h Transient output inhibit disabled.

MOTOROLA MC44BC373/374 Technical Data 7

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C Programming

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WRITE MODE: Test Mode 2

X5 X4 X3 State Description

0002.a Normal operation.

0012.b Test pattern generator DC verification (Test pattern DC test mode available).

0102.c

0112.d Reference divider test (UHF reference divider on PLLFILT pin).

1002.e

1012.f

1102.g

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1112.h

Programmable divider test (UHF programmable divider on PLLFILT pin and sound programmable divider on SPLLFIL pin).

UHF phase comparator, upper source on PLLFILT pin. Sound phase comparator 10 µA upper source on SPLLFIL (only valid during Transient Output Inhibit).

UHF phase comparator, lower source on PLLFILT pin. Sound phase comparator 10 µA lower source on SPLLFIL (only valid during Transient Output Inhibit).

Sound phase comparator 1 µA upper source on SPLLFIL (not valid during Transient Output Inhibit).

Sound phase comparator 1 µA lower source on SPLLFIL (not valid during Transient Output Inhibit).

READ MODE

OOR Description

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0 Normal operation, VCO in range.

1 VCO out-of-range.

Y1 Description

0 VCO out-of-range, frequency too low, only valid if OOR=1.

1 VCO out-of-range, frequency too high, only valid if OOR= 1.

Y2 Description

0 High VCO is active.

1 Low VCO is active.

8 MC44BC373/374 Technical Data MOTOROLA

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Modulator High Frequency Characteristics

8 Modulator High Frequency Characteristics

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Unless otherwis e state d: Vcc=5.0V, Ambient Temperature=25oC, Video Input 1V

, 10-step grayscale.

p-p

RF inputs /outputs into 75Ohm load. SPECIFICATIONS VALID ONLY FOR ENVELOPE DEMODULATION.

Parameter Test Conditions Min Typ Max Unit Type

TVOUT output level

UHF oscillator frequency — 460 — 880 MHz A

VHF range From UHF oscillator internally divided. 45 — 460 MHz B

TVOUT output attenuation

Sound subcarrier harmonics (Fp + n∗Fs) Reference picture carrier. —–63 –58 dBc C

Second harmonic of chroma subcarrier Using red EBU bar. –65 ——dBc C

Chroma/ Sound intermodulation: Fp + (Fsnd– Fchr)

Fo (picture carrier) harmonics

Out band (picture carrier) spurious

In band spurious (Fo 5 MHz) No video sound modulation. ——60 dBc C

NOTE 1: Picture carrier harmonics are highly dependant on printed circuit board layout and decoupling capacitors.

dBc

471 521 571 621 671 721 771 821 871

Maximum specification

dBuV

471 521 571 621 671 721 771 821 871

2Fo Harmonics

Minimum specification

Frequency (Mhz)

TV Output Level

Minimum specification

Frequency (Mhz)

Output signal from modulator section. See Figure 3.

During transient output inhibit, or when ATT bit is set to 1. See Figure 3.

Using red EBU bar. –65 ——dBc C

2nd harmonic: CH21 3rd harmonic: CH21 Other channels: See Figure 3. See NOTE 1.

1/2∗ Fo – 1/4∗ Fo – 3/2∗ Fo – 3/4∗ Fo From 40MHz to 1GHz.

Typi cal

dBc

Minimum specification

471 521 571 621 671 721 771 821 871

dBc

TV Output Atte nuation

471 521 571 621 671 721 771 821 871

73 74.577dBµVB

50 60 — dBc B

30203526—

— dBc C

— 010dBµVC

3Fo Harmonics

Typ ical

Frequency (Mhz)

Typi cal

Minimum specification

Frequency (M hz)

Figure 3. Typical Performance—Modulator High Frequency

MOTOROLA MC44BC373/374 Technical Data 9

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Video Characteristics

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9 Video Characteristics

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Unless otherwis e sta te d: Vcc=5.0V, Ambient Temperature =25oC, Video Input 1V

, 10-step

p-p

grayscale. RF inputs/outputs into 75Ohm load. SPECIFICATIONS VALID ONLY FOR ENVELOPE DEMODULATION.

Parameter Test Conditions Min Typ Max Unit Type

Video bandwidth

Video input level 75Ohm load. ——1.5VcvbsD

Video input current ——0.21µA A

Video input impedance — 500 ——KΩ A

Peak White Clip PWC bit set to 1, see PWC section. 110 114 118 % A

Video S/ N See Figure 4. 50 53 — dB C

Differential Phase See Figure 4. –5 — 5 deg C

Differential Gain

Luma/ Sync ratio Input ratio 7.0:3.06.8/3.2 — 7.2/2.8 — B

PAL video modulation depth — 75 81 88 % B

SECAM video modulation depth — 88 93 99 % B

PAL Video Modulation Depth

88 86 84 82

Typ ical

78 76

471 521 571 621 671 721 771 821 871

Frequency (Mhz)

Reference 0dB at 100 kHz, measured at 5 MHz.

On line CCIR 310, worst of first 4 out of 5 steps. See Figure 4.

Video Signal to Noise

Maximum specification

Minimum specification

Typical

Minimum specification

471 521 571 621 671 721 771 821 871

Frequency (Mhz)

–1.5 –0.8 — dB C

–5 — 5%C

SECAM Video Modulation Depth

100

Typical

471 521 571 621 671 721 771 821 871

Maximum specification

Minimum specification

Frequency (Mhz)

Figure 4. Typical Performance—Video

10 MC44BC373/374 Technical Data MOTOROLA

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10 Audio Characteristics

Audio Characteristics

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Unless otherwis e sta te d: Vcc=5.0V, Ambient Temperature =25oC, Video Input 1V

, 10-step

p-p

grayscale. RF inputs/outputs into 75Ohm load. SPECIFICATIONS VALID ONLY FOR ENVELOPE DEMODULATION.

Parameter Test Conditions Min Typ Max Unit Type

Picture-to-Sound ratio

Audio modulation depth

Audio input resistance — 45 53 61 KΩ A

Audio Frequency response

Audio Distortion FM (THD only)

Audio Distortion AM (THD only)

Audio S/ N with Sync Buzz FM

Audio S/ N with Sync Buzz AM

PS bit set to 0. PS bit set to 1.

Using specific pre-emphasis circuit, audio input level=205 mVrms–audio frequency=1kHz

AM modulation: SECAM Fs=6.5MHz 65 80 95 % B

FM modulation: Fs=5.5, 6 or 6.5MHz 100% modulation=±50kHz FM deviation

FM modulation: NTSC Fs=4.5MHz 100% modulation=±25 kHz FM deviation

Reference 0dB at 1kHz, using specified pre-emphasis circuit, measure from 50Hz to 15kHz. –2.5 — +2dB C

At 1kHz, 100% modulation (± 50kHz). No video.

At 1kHz, 100% modulation. No video.

Video input EBU color bar 75%. Weighting filter CCIR 468-2.

Reference 1kHz, 85% modulation. Video input EBU color bar 75%. Audio BW from 40Hz to 15kHz. Weighting filter CCIR 468-2.

Audio Signal to Noise

Typical

Minimum specification

471 521 571 621 671 721 771 821 871

Frequency (Mhz)

65 80 95 % B

— 0.42 % C

— 1.52.5% D

48 53 — dB C

45 50 — dB D

19 15

dB B

Figure 5. Typical performance—Audio

MOTOROLA MC44BC373/374 Technical Data 11

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Antenna Booster/Splitter Characteristics

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11 Antenna Booster/Splitter Characteristics

Unless otherw ise s tat ed: Vcc=5.0V, Ambient Temperature=25oC, RF inputs/outputs into 75Ohm load. All specifications use a BALUN at ANT1 & 2 inputs, assuming 0.8dB losses MA X from 40MHz to 860MHz.

Parameter Test Conditions Min Typ Max Unit Type

Frequency range — 40 — 860 MHz C

Gain

Gain flatness 40 to 860MHz. –1.5 + 1.5dB C

Noise figure

VSWR

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Intermodulation (IMD)

Isolations

ANT1, 2 to VCRTU. ANT1, 2 to TVOUT.

ANT1, 2 to VCRTU and TVOUT. Modulator in standby mode.

ANT1, 2 to VCRTU and TVOUT. Modulator in normal mode (ON).

All pins, BST bias ON. At TVout and VCRTU pins, BST bias OFF.

At TVin pins, BST bias OFF. — 2.53 — B

Input level=90 dBuV. See IMD measurement section. F1+F2 IMD 2F1–F2, 2F2+ F1, F1–F2 IMD

From TVOUT or VCR to ANT1, 2 TVOUT/VCRTU

—

5.57.59.5dB C

6.58.510.5dB C

— 1.52.5 — B

— —

48 30

55 60

60 45

4 4

—

47 50

— —

dB dB

dBc dBc

B B

C C

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11.1 Typical Performance—Gain and Isolation

Gain ANT1 ,2 to VCRTU and TVOUT

Maximum specification

Minimum specification

0 150 300 450 600 750 900

-30

-40

-50

-60

dBc

-70

-80

-90 0 150 300 450 600 750 900

Fre q u e n cy (M h z )

Isolation Output to Input

Minimum specification

Frequency (M hz)

Typical

Typ ical

Is olation Output to Output

-10

-20

Minimum specification

-30

-40

dBc

-50

-60

-70 0 150 300 450 600 750 900

Frequency (M hz)

TVOUT

VCRTU

Typical

Figure 6. Typical Performance—Gain and Isolation

12 MC44BC373/374 Technical Data MOTOROLA

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Antenna Booster/Splitter Characteristics

11.2 Typical Performance—Noise Figure

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Noise Figure @ M odula tor OFF

0 150 300 450 600 750 900

Maximum specification

Typ ical

Frequency (M hz)

Figure 7. Typical Performance—Noise Figure

Noise Figure @ M odulator ON

0 150 300 450 600 750 900

Maximum specification

Typical

Frequency (M hz)

11.3 Intermodulation (IMD ) Measurement

50/75

BALUN

MC44BC373/4

90dBuV

F1 F2

Figure 8. Intermodulation (IMD) Measurement

Intermodulation (IMD) frequencies are all frequency combinations coming from the two input carriers F1 and F2: F2–F1, 2∗F1–F2, 2∗ F2–F1 and F1+F2, fall in the 40M Hz–900MHz range.

F1 and F2 input levels are set t o 90dBuV at the input of the BALUN. F1 and F2 frequency generator level s (50W internal load) take into account a 50 to 75Ohm load difference (1.8dB), plus losses in the 3dB coupler and the 50 to 75Ohm transformer.

TVOUT

Pin 20

Pin 17

VCRTU

75/50

F2–F1

Spectrum Analyzer

IMD (dBc)

2F1–F2

2F2–F1

F1+F2

Intermodulation measurement is the difference (in dBc) between the F1 or F2 level at the Output (VCRTU or TVOUT) and the frequency combinations level, for the following cases:

F1= 50MHz and F2=60MHz F1= 100MHz and F2= 110MHz F1=200MHz and F2=210MHz

F1= 300MHz and F2=310MHz F1 =400MHz and F2= 410MHz F1=500MHz and F2=510MHz

F1= 600MHz and F2=610MHz F1 =700MHz and F2= 710MHz F1=800MHz and F2=810MHz

Intermodulation specification is the IMD measurement’s worst case.

MOTOROLA MC44BC373/374 Technical Data 13

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Modulator Operation

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12 Modulator Operation

12.1 Power-ON Settings

At power-ON, the MC44BC373 and MC44BC374 configuration is as follows:

WRITE MODE Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ACK

C1—High Order Bits 10000000ACK

C0—Low Order Bits 00001000ACK

FM—High Order Bits 0 0 N11 N10 N9 N8 N7 N6 ACK

FL—Low Order Bits N5 N4 N3 N2 N1 N0 0 0 ACK

Note: 1. N0 to N11 are set to have the UHF oscillator on channel 36 (591.25MHz). Note: 2. Peak White Clip is ON.

Note: 3. Sound frequency is 5.5MHz.

Note: 4. Sound auxiliary input is disabled.

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Note: 5. Logic Output Port is low voltage.

Note: 6. Picture-to-sound ratio is 12dB.

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The settings indicated can be customized in the special masked version.

12.2 Power Supply

The five device Vcc pins (13, 15, 16, 21, 23) must be applied at the same time to ensure al l int ernal blocks are correctly biased. All other pins must not be biased before Vcc is applied to the device. The printed circuit board layout of the Vcc supplies must be designed to ensure maximum is olation of the I/P to O/P and also between the two O/Ps.

12.3 Standby Mode

During standby mode, the modulator is switched to low power consumption; the sound oscillator, UHF oscillator, video and sound modulator sections bias are internally turned OFF.

The I

C bus and booster sections remain active.

The modulator can be programmed in standby mode using a combination of three bits:

1. OSC=1

2. SO=1

3. ATT=1

14 MC44BC373/374 Technical Data MOTOROLA

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Modulator Operation

12.4 Test Bit TB1

This test bit allows an initial evaluati on of MC44BC373 and MC44BC374 using software developed for MC443535:

• TB1= 0 — All MC44BC373/374 functions available—normal mode.

• TB1= 1 — Limited software compatibility with MC44353; MC44BC373/374 functions not available.

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WRITE MODE

CA-CHIP ADDRESS 11001010ACK

C1-High Order Bits 1 ——PS ——SYSL ACK

C0-Low Order Bits ———SFD1 SFD0 1 0 0 ACK

FM-High Order Bits 0 TPEN N11 N10 N9 N8 N7 N6 ACK

FL-Low Order Bits N5 N4 N3 N2 N1 N0 ——ACK

Note: 1. Case TB1= 1, compatible with MC44353 Note: 2. All “—” are don’t care bits.

Note: 3. PS bit replaces PSD2 bit in MC44353 bus format:

PS = 0 is for picture-to-sound ratio = 12dB, PS = 1 is for picture-to-sound ratio = 16dB

Note: 4. SFD1 and SFD0 bits have the same definition for both bus formats (MC44353 and MC44BC373/374) and lets a sound frequency between 4.5MHz, 5MHz, 5.5MHz, and 6.5MHz be selected.

Note: 5. SYSL bit has same definition for bus formats MC44353 and MC44BC373/ 374; either system L or B/G is selectable.

Note: 6. All MC44BC373/ 374 functions are set to their default values.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 ACK

12.5 System L or B/G Selection

SYSL bit internally switches the follow ing functions :

• SYSL = 0; e nables B/G system — Video modulation polarity—Negative — Video modulation depth—80% Typical (See Video Characteristics on page 10.) — Sound modulation type—FM

• SYSL = 1; enables L system — Video modulation polarity—Positive — Video modulation depth—90% Typical (See Video Characteristics on page 10.) — Sound modulation type—AM

12.6 Transient Output Inhibit

To minimize the risk of interference to other channels while the UHF PLL is acquiring a lock on the desired frequency, the Sound and Video modulators are turned OFF for each of the following two cases:

1. Power-ON from zero (i.e., all Vcc is switched from 0V to 5V).

2. UHF oscillator power-ON from OFF state (i.e., OSC bit is switched from 1 to 0)

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Modulator Operation

There is a time-out of 263ms until the output is enabled. This allows the UHF PLL settle to its programmed frequency. During the 263m s time-out, the sound PLL current source is set to 10µA typical, to speed up the locking time. After the 263ms time-out, the current source is switched to 1µA.

Use care when selecting loop filter components, to ensure the loop transient does not exceed the specified delay.

For test purposes, it is possible to disable the 263ms delay using Test Mode1–State1.h.

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CAUTION:

12.7 Logic Output Port (LOP)

The LOP pin controls any logic function. The primary applications are to control an external attenuator or an external switch betwee n the antenna input and TV output. When an external switch is controlled, the Booster function is not used.

The following figure shows a typical attenuator application with PIN diode. The LOP pin switc hes the PIN attenuator depending on the signal strength of the Antenna Input, thereby reducing the risks of

nc...

Intermodulation in c ertain a reas. The LOP may also be use d as an OFF posit io n bypass switc h or for other logic function s in the ap plica tion.

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Vcc

Antenna

Input

LOP pin

Figure 9. Attenuator Application with PIN Diode

TV Out

12.8 Video Section—Peak White Clip

The modulator requires the following:

• A composite video input with “negative going” sync pulses

• A nominal level of 1Vp-p

This signal is AC-coupled to the video input where the sync tip level is clamped. The video signal is then passed to a Pea k White Clip (PWC) circuit. The PWC circuit function sets to soft- clip the top of the video waveform, if the “sync tip amplitude” to “peak white clip” goes too high. This method avoids carrier overmodulation by the video. Clipping can be disabled by software.

12.9 Sound Section

The multivi brator oscillator is fully integrated and does not require external components. An internal low pass filter and matched structure provide a very low harmonics level.

The sound modulator system consists of an FM modulator incorporating the sound subcarrier oscillator, and an AM modulator. The audio input signal is AC coupled into the amplifier which then drives the two types of modulators.

The audio pre-emphasis circuit is a high-pass filter with an external capacitor and an internal resistor (100kOhms). The recommended capacitor value (470pF) is for BG standard. (50µS time constant.)

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The auxiliary audio input adds a sound subcarrier to the main carrier. The input can be a modulated NICAM carrier or a second sound subcarrier for a stereo system. Pin 12 is directly connected to the sound modulator input and the pict ure-to -soun d ratio (P/S Rati o) de pends o n the auxil iary audio inp ut le vel. (P/S ratio is 20dB for 35mVrms typical.)

Modulator Operation

12.10 Test Pattern Generator

A simple test pattern is generated on the IC which can be switched in under bus control to permit a TV receiver to eas ily t une i n to t he mo dulat or out put. The patt ern co nsist s of t wo whit e vert ical bars on a blac k background and a 976Hz audio test signal.

TE2

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TE1

10 20 30 40 50 60

Figure 10. Test Pattern Generator—(Time in Seconds)

24 28 44

TIME IN µS.

12.11 PLL Section

The reference divider is a fixed divide-by-128, resulting in a reference frequency of 31.25KHz with a

4.0MHz crystal. The 31.25KHz referen ce fr eque ncy is used for both UHF and Sound PLLs. The prescaler is a fixed divide by 8 and is permanently engaged. The programmable div ide r’ s di vi sion ratio is controlled by the state of contr ol bit s N0 t o N11. The div ide r

ratio N for a desired frequency F (in MHz) is provided by the following formulas:

cale Semiconductor,

with:

128

-- -

-------- -

×=

7/10

3/10

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N 2048 N11× 1024 N10×……4N2× 2N1× N0+ ++++=

12.12 UHF Oscillator—VHF Range

The UHF oscillator is fully integrated and does not require any external components. For low frequency testing or VHF ra nge ope rati on (t est mod e 1, states 1.b to 1.c), the UHF oscilla tor can be inter nally divi ded by 2, 4, 8, or 16.

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High-Speed I

C Compatible Bus

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13 High-Speed I2C Compatible Bus

13.1 Specification Conditions

Unless otherwise specified, the Vcc1=5.0V and the ambi ent temperature (TA) =25oC.

Electrical Characteristics Min Typ Max Unit Type

SDA/SCL output current at 0 V —— 10 µA A

SDA/ SCL low input level —— 1.5 V B

SDA/SCL high input level 3.0 —— VB

SDA/ SCL input current for input level from 0.4V to 0.3Vcc – 5 — 5 µA C

SDA/SCL input level 0 — Vcc+0,3 V D

SDA/SCL capacitance —— 10 pF C

ACK low output level ( sinking 3mA) — 0,3 1 V A

ACK low output level ( sinking 15mA) —— 1.5 V C

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Timing Characteristics Min Typ Max Unit Type

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Bus clock frequency 0 — 800 kHz C

Bus free time between stop and start 200 —— ns C

Setup time for start condition 500 —— ns C

Hold time for start condition 500 —— ns C

Data setup time 0 —— ns C

Data hold time 0 —— ns C

Setup time for stop condition 500 —— ns C

Hold time for stop condition 500 —— ns C

Acknowledge propagation delay —— 300 ns C

SDA fall time at 3ma sink I and 130pF load —— 50 ns C

SDA fall time at 3ma sink I and 400pF load —— 80 ns C

SDA rise time SCL fall/ rise time

Pulse width of spikes suppressed by the input filter —— 50 ns C

— —

300 300

ns ns

13.2 Timing Definitions

Tbuf

SSDA

StartStop

Chip Address

...

ACK

SDA

Start

Stop

SDA

C C

SSCL

SCL

...

Thd;datTsu;datTsu;sto Thd;sta Tack:low

Figure 11. SSDA/SSCL Timing

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Tsu;sta

Thd;sto

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High-Speed I2C Compatible Bus

13.3 Levels Definition

Vcc

SDA

Vih

...

Vil 0V

Figure 12. SDA Levels

dead band

13.4 High-Speed I2C Compatible Bus Format

SCL

1 2 3 4 5 6 7 8 9

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11 12

10 14

16 17

454415 19

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STA Chip Address ($CA)

First Data Byte (C1 or FM)

ACK

Data

ACK

Stop

ACK

SDA

Figure 13. SCL and SDA Bus Timing

13.5 I2C Write Mode Format and Bus Receiver

The bus receiver operates the I2C compatible data format. The chip address (I2C bus) is:

11001010 (ACK)=$CA(hex) in write mode

In write mode, each ninth data bit (bits 9, 18, 27, 36, and 45) is an acknowledge bit (ACK) during which the MCU sends a logic 1 and the Modulator circuit answers on the data line by pulling it low. Besides the chip address, the circuit needs two or four data bytes for operation. The following data byte sequences are the permitted incoming information:

Example 1 STA CA C1 C0 STO

Example 2 STA CA FM FL STO Example 3 STA CA C1 C0 FM FL STO

Example 4 STA CA FM FL C1 C0 STO

With:

STA = Start condition CA = Chip Address

FM = Frequency information, high order bits FL = Frequency information, low order bits C1 = Control information, high order bits CO = Control information, low order bits

STO = Stop condition

After the chip address, two or four data bytes may be received.

• If three (3) data bytes are received, the third one is ignored.

• If five (5) or more data bytes are re ceived, the fifth and following ones are ignored, and the last ACK pulse is sent at the end of the fourth data byte.

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High-Speed I

The first and third data bytes contain a function bit which lets the IC distinguish between frequency information and contr ol informa tion. If the func tion bit i s a logic 1, the t wo followi ng bytes cont ain contro l information. The first data byte after the chip address may be byte CO or byte FM. The two bytes of frequency information are preceded by a logic 0.

C Compatible Bus

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13.6 I2C Read Mode Format

The chip address (I2C) is:

11001011 (ACK)=$CB(hex) in read mode

The incoming information consists of the read mode chip address byte. The device then answers with an ACK followed by one byt e cont aining thre e bits of st atus infor mati on. No ac knowl edge i s answe red by the modulator after this byte.

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14 Application and Case Diagrams

Proposed BiCMOS Modulator and Booster/Splitter Application

This document contains information on a new product under development. Motorola reserves the right to change or discontinue this product without notice.

Application and Case Diagrams

GND

Vcc

10nF

Vcc

1nF

100nF

Note 2

22nF

10nF

2.2k

47nF

TVOUT

VCRTU

VideoO

SCLSDA

SCL

1nF

SDA

LOP

XTAL

GND

ANT1

ANT2

GND

PREEM

AUDIO

SPLLFLT

AUXIN

LOP

4MHz

ANTIN

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Pre-em

470pF

100nF

Note 1

1nF

220nF

22nF

GNDD

VCCD

PLLFLT

TVOVCC

TVOUT

VCRTU

VCRVCC

VCCA

VIDEO

VCCI

15k

Audio

Auxin

Note 1: Cx value depends on crystal characteristics; Cx = 27pF on Motorola application board. Note 2: Loop filter components must be as close as possible to pins 22 and 23.

cale Semiconductor,

Figure 14. Proposed BiCMOS Modulator and Booster/Splitter Application

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Application and Case Diagrams

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CASE 940H-02 ISSUE A

Dim

A 7.70 7.90 0.303 0.311

B 4.30 4.48 0.169 0.176

C — 0.95 — 0.037

D 0.05 0.15 0.002 0.006

F 0.51 0.71 0.020 0.028

G 0.65 BSC 0.026 BSC

H 0.27 0.37 0.011 0.015

J 0.09 0.18 0.003 0.007

J1 0.09 0.13 0.003 0.005

K 0.19 0.30 0.007 0.012

K1 0.19 0.25 0.007 0.010

L 6.25 6.50 0.246 0.256

Millimeters Inches

Min Max Min Max

Note: 1. Dimensioning and Tolerancing per ANSI Y14.5M, 1982.

Note: 2. Controlling dimension: Millimeters.

Note: 3. Dimensions A and B do not include mold flash

or protrusions and are measured at the parting line. Mold flash or protrusions shall not exceed 0.15 (0.006) per side.

Note: 4. Dimension is the length of terminal for soldering to a substrate.

Note: 5. Terminal positions are shown for reference only.

Note: 6. The lead width dimension does not include Dambar protrusion. Allowable Dambar protrusion shall be

0.08 (0.003) total in excess of the lead width dimension at maximum material condition. Dambar can not be located on the lower radius or the foot. Minimum space between protrusions and adjacent lead to be 0.14 (0.006 ).

Figure 15. TSSOP24 Package

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NOTES

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HOW TO REACH US:

USA/EUROPE/LOCATIONS NOT LISTED:

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ASIA/PACIFIC:

Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong 852-26668334

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TECHNICAL INFORMATION CENTER:

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MC44BC373/D

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MOTOROLA MC44BC373, MC44BC374 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual