CXA3050M

24 pin SOP (Plastic)

E96331A66-ST

NICAM and SMATV RF MODULATOR/PLL

Description

Fully synthesized I

C controlled UHF/VHF TV RF

Modulator compatible with PAL and NTSC video

formats.

Features

· Minimal adjustment of external components

· For use on VHF and UHF TV Frequencies

· Video RF carrier frequency programmable in 125kHz

steps

· Accepts NICAM 6.552MHz QPSK input signal

· Accepts FM Stereo input signal

· I

C control of:

a. Video RF Carrier Frequency

b. Sound Carrier Frequency

c. Modulation Depth (±2% Typ.)

d. FM Deviation (±8% Typ.)

e. P/S ratio (±1dB Typ.)

f. Nicam output enable to sleep

g. Video RF carrier enable to sleep

· On chip Regulator 3.1V

Block Diagram

Structure

Bipolar silicon monolithic IC

Applications

· PAL and NTSC System VCR

· Satellite Receiver

· Set Top Box

· SMATV

Recommended Operating Voltages (Ta = 25°C)

· Supply voltage

5.0 ± 0.5

· Supply for VCO Varactor

30 ± 0.5

· Operating Temperature

10 to +80

°C

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

Video-in

RF-OUT

Vreg

Mod-adj

Audio-in

FM-Tank

Audio-Loop

filter

Digital GND

Xtal

Digital-V

SCL

SDA

Analog GND

NICAM-in

Analog V

OSC V

OSC4

OSC3

OSC2

OSC1

OSC GND

PDout

VIDEO
MIXER

NICAM
MIXER

AMP

VCO

AMP

PLL

TPSG

PLL

OSC

REG

FM-OSC

W/C-CLAMP

PLL

C-Interface

CXA3050M

Functional Description of RF Modulator System

A block diagram of the RF modulator is shown in Fig. 1.

The composite video signal passes through an amplitude limiting circuit and a digitally controlled modulation

depth adjustment circuit. By means of three allocated I

C control bits it is possible to adjust the modulation

depth from a nominal 74% to 86% in 2.0% steps. Modulation depth can also be controlled externally by

addition of an external resistor on pin3. The video signal is then passed through to the mixer. In the mixer

stage, both the video composite signal and FM sound carrier amplitude modulate the RF carrier from the UHF

OSC, and the issuing signal is fed to the output via an RF amplifier.

The audio signals enter the chip via pin4. The FM Voltage Controlled Oscillator is band-switched to the

approximate centre frequencies of the four sound carrier frequencies 4.5MHz (NTSC) or 5.5, 6.0, 6.5MHz

(PAL). The required correct audio carrier frequency is fine tuned by the adjustment of fsound via I

C, where

upon the FM phase locked loop will lock the VCO onto the exact centre frequency. Minimum distortion of the

FM signal occurs when the centre frequency of the oscillator coincides with a mid-rail control voltage

(to 2.0V). Hence fine adjustment capacitors are also integrated on the chip, which tag into account any

capacitance variations from one batch to another. This is achieved by fine adjustment of Delta fsound via I

control. The design of the FM modulator eliminates the need for an external varactor.

The amplitude of the FM signal is varied via I

C by a digitally controlled logarithmic gain stage, which controls

the picture to sound power ratio (P/S). This signal is then fed into the RF amp. Hence at the RF output the P/S

ratio can be programmed in 1dB steps between the range 10dB and 17dB (see Electrical Characteristics).

Audio sensitivity can be programmed in 8% steps between the range 32% and +24%.

The UHF is phase locked to the reference frequency by means of the UHF phase locked loop. The VCO

output passes through a prescaler (

8) followed by an I

C controlled programmable divider (

M), and then

phase compared with that of a reference signal at 15.625kHz. The reference signal is derived from a 4MHz

crystal oscillator feeding a 256 divider. The UHF oscillator covers the frequency range 471MHz to 855MHz in

frequency steps of 125kHz. This is adequate for the UHF NTSC and PAL TV channels (471.25MHz (CH21) to

855.25MHz (CH69)). By adjustment of the external components around the oscillator and some adjustment to

output matching the RF modulator can also achieve range of frequencies in the VHF range.

The Nicam input (pin 22) accepts the 6.522MHz Nicam signal subcarrier QPSK at 728K bits/s data. This is

then buffered and feed into a separate mixer (controlled via VCO). This then feeds to the RF amp with the

composite video and audio. The I

C control will switch the Nicam signal output off or on.

CXA3050M

C Interface Data Format

Modulator Address

Data 1

Data 2

Data 3

Data 4

R/W

ask

M12

ADJ1

M11

NIC

ADJ0

M10

FM2

FM1

FM0

over
mod

MD2

PS2

MD1

PS1

MD0

PS0

ask

Sound Carrier Course Adjust

Sound Carrier
Frequency

TV System
(Pre-emphasis)

4.5MHz

5.5MHz

6.0MHz

6.5MHz

NTSC

PAL

Sound Carrier Fine Adjust

ADJ1

ADJ0

df Adjust

on chip
capacitance

Normal

6.4pF

3.2pF

1.6pF

RF Power on (RF Amp & OSC)

1 bit

OVM

Over Modulation Test

1 bit

M12MO

Main divider control data

13 bits

S1S0

Sound carrier frequency selection

2 bits

ADJ1ADJ0

Sound carrier frequency adjust (0 to 6.4RF)

2 bits

MD2MD0

Modulation Depth

3 bits

PS2PS0

Picture/Sound control

3 bits

FM deviation adjust

3 bits

NIC

Nicam Enable

1 bit

M12

Main UHF PLL Divider

MSB

LSB

8191 to 2

Video Carrier frequency calculated from = 125 (M + 2) kHz

CXA3050M

Software Application Notes

The minimum requirement to drive the CXA3050 and I

C bus drive is a 386/486 with 4M bytes hard disk

space, 16MHz clock speed and running DOS5.00 or above. Insert the disc into the drive and type TESTS and

at the prompt type iic. At this there should appear a single list of user friendly functional tests that can be

changed by keyboard manipulation. As an aid the test list is written below. Note Page up increments the

status, page down decrements the status.

Function

Nominal Status

Comments

RF Output Power

Delta Sound

Fsound

Frequency mode

Mod depth

FM Deviation

P/S Ratio

Nicam on/off

Over Mod on/off

1/0

2 to 8191

1/0

Turns RF Amp, OSC on/off

Fine tune audio carrier

Course adjust for
4.5MHz (0)
5.5MHz (1)
6.0MHz (2)
6.5MHz (3)

Check listing on page 10 for
frequency to hex conversation

Ranges mod depth from
72% to 86%, 80% (4)

Sensitivity adjustable

Programmable in 8 steps of 1dB

Nicam Mixer on

Increase Video modulation ratio

CXA3050M

Pin
No.

Reference

Pin Voltage
Typical DC

Equivalent circuit

Description

PDout

2.1V

OSC GND

OSC1

2.5V

OSC2

1.7V

OSC3

1.7V

OSC4

2.5V

OSC V

Phase detector
output

VCO Ground

UHF OSC

Oscillator supply
Voltage 5V

Nicam-in

NICAM or FM
carrier input

RF-OUT

3.4V

RF output.
Must be terminated
with 75

MIXER

Application Circuit Notes

1. RF output pin 24 should be connected to a 75

load in oder to measure accurate input level. Also note pin 24

has 2.7k

to GND.

The output is measured using a spectrum analyzer.

2. After turning the device on, tune the variable inductor FM Tank so at the 6.5MHz setting (set by I

C control)

the voltage on pin 6 should read 2.02V.

Set Fsound = 3

Delta Fsound = 1

CXA3050M

Specifications

Parameter

New Specification

Operating temperature range

Modulation Index

Diff. Gain 80 to 87.5% modulation

Deviation range (audio)

NICAM input level

NICAM input resistance

Picture/sound ratio adj

Video modulation adj

Audio FM sensitivity

Picture/Sound ratio

Inter carrier accuracy

10 to 80°C

77.5 to 90%

±6.5%

±6.5 degree

±10kHz to ±100kHz

79dBµV

1dB

7steps

1dB

7steps

±1kHz

Parameter

Condition

Min.

Current consumption
Full operation
V

= 5.0V

DC Supply operating range

Operating temperature range

Input level

Output level

Input resistance

Bit error rate

Eye-height degradation

Analog

digital

OSC

Conversion, Loss = 30dB

5.0

10e

61.3

30.6

14.6

10e

9.6

4.5

Vdc

°C

dBµV

dBc

Typ.

Max.

Unit

CXA3050M

Parameter

Condition

Min.

Output impedance

Output return loss

RF Output level

RF Frequency respone

Picture/Sound ratio

VHF1 Frequency range

VHF2 Frequency range

UHF Frequency range 1

UHF Frequency range 2

RF Accuracy

Inter-carrier frequency range

Inter-carrier accuracy

RF Carrier phase noise

Sound carrier phase noise

Hum modulation

Chroma beat

C/N Ratio

RF Harmonics

Sub-carrier harmonics

NICAM Beat

Reference spurious frequency.

Spurious output level

700MHz 75

termination

Using attached application

4.5, 5.5, 6.0, 6.5

10kHz offset frequency

1/2 Video band offset

15.625kHz

84.7

±2.5

±1

120

230

860

800

±50

6.5

±1

170

470

670

4.5

dBµV

dBc

MHz

kHz

MHz

kHz

dBc/Hz

dBc

Typ.

Max.

Unit

RF Characteristics

CXA3050M

Parameter

Condition

Min.

Input resistance

Input voltage

% Modulation Clipping

C control index

Modulation flatness

Modulation

Modulation stability by temperature

Field time distortion

Line time distortion

S/N

K Factor

Video frequency response

80% Modulation

7 steps

Band Limited (46CH to 60CH)

0.55p-p input (mod Adja)

mp (Ta = 10 to 80°C)
mp (Ta = 25°C)

Weighted

With 2T pulse

Per standard

100

0.55

0.5

±0.4

±1.4

±3

±0.5

Vp-p

IRE

Typ.

Max.

Unit

Video Characteristics

Parameter

Condition

Min.

Input voltage

Input resistance

Deviation range

Audio distribution

Deviation sensitivity

Audio SNR

Harmonic distortion

Frequency response

FM Hum and noise

@50kHz, Deviation

4.5MHz

System M
4.5MHz ± 25kHz = 100% = 0dB

System B/G
5.5MHz ± 50kHz = 100% = 0dB

System I
6MHz ± 50kHz = 100% = 0dB

System D/K
6.5MHz ± 50kHz = 100% = 0dB

Quasi-Parallel, Detection

50 to 100%, Deviation

50 to 15kHz

25 to 75kHz, Deviation

0.5

0.33

0.404

±100

±15

±5

0.1

±10

Vp-p

kHz

kHz/mV

kHz

Typ.

Max.

Unit

Audio Characteristics

CXA3050M

SCL

SDA

C20

0.1µ

C17

27pF

4MHz-Xtal

GND

C15

22nF

22pF

C10

0.01µ

AUDIO

VIDEO

22pF

330pF

180k

C12

47µ

240

17µ

22k

100k

22µ

0.33µ

22pF

2.7k

RF OUT

GND

NICAM

1nF

Analog

22pF

1nF

C14

6pF

C16

2pF

C18

6pF

20k

C11

22pF

1T363

25nH

20k

C13

220pF

C19

220pF

OSC

GND

C24

0.01µ

C22

1nF

R11

20k

C23

0.047µ

C21

1nF

R12

300

C25

1nF

GND

R16

56k

C26

1nF

R13

200

R15

C28

1nF

R14

200

+30V

R10

330

NICAM-IN

VIDEO

RFOUT

VREG

MOD-ADJ

AUDIO

TANK

ALF

D-GND

XTAL

D-V

SCL

SDA

A-GND

ANALOG-V

OSC-V

OSC4

VCO3

OSC2

OSC1

OSC-GND

PDOUT

C27

20pF

Application Circuit 1

Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for

any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.

CXA3050M

SCL

SDA

C21

0.1µ

C18

27pF

4MHz-Xtal

GND

C15

22nF

C10

22pF

C11

0.01µ

AUDIO

VIDEO

22pF

330pF

180k

C12

47µ

240

17µ

22k

100k

22µ

0.33µ

22pF

2.7k

RF OUT

GND

NICAM

1nF

22pF

1nF

C14

6pF

C17

3pF

C19

6pF

20k

22pF

1T363

14nH

C16

5pF

C30

220pF

R10

20k

C13

220pF

C20

220pF

GND

C25

0.01µ

C23

1nF

R11

20k

C24

0.047µ

C22

1nF

R12

300

C26

1nF

GND

R16

56k

C29

20pF

C27

1nF

R13

200

R15

C28

1nF

R14

200

+30V

NICAM-IN

VIDEO

RFOUT

VREG

MOD-ADJ

AUDIO

TANK

ALF

D-GND

XTAL

D-V

SCL

SDA

A-GND

ANALOG-V

OSC-V

OSC4

VCO3

OSC2

OSC1

OSC-GND

PDOUT

Analog

OSC

L = 14nH

Application Circuit 2

Dual-OSC

Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for

any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.

CXA3050M

SCL

SDA

C21

0.1µ

C17

27pF

4MHz-Xtal

GND

C15

22nF

22pF

C10

0.01µ

AUDIO

VIDEO

22pF

330pF

180k

C12

47µ

240

17µ

22k

100k

22µ

0.33µ

22pF

2.7k

RF OUT

GND

NICAM

1nF

Analog

22pF

1nF

C14

120pF

C16

47pF

C18

120pF

20k

C11

22pF

1T363

1µ

C19

1nF

R10

20k

C13

330pF

C20

330pF

OSC

GND

C25

0.01µ

C23

1nF

R11

20k

C24

0.047µ

C22

1nF

R12

300

C26

1nF

GND

R16

56k

C29

20pF

C27

1nF

R13

200

R15

C28

1nF

510

NICAM-IN

VIDEO

RFOUT

VREG

MOD-ADJ

AUDIO

TANK

ALF

D-GND

XTAL

D-V

SCL

SDA

A-GND

ANALOG-V

OSC-V

OSC4

VCO3

OSC2

OSC1

OSC-GND

PDOUT

R14

200

+30V

Application Circuit 3

VHF-Band

Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for

any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: CXA3050M