CXA3050 [SONY]

NICAM and SMATV RF MODULATOR/PLL; NICAM和卫星电视共用天线射频调制器/ PLL


型号：	CXA3050
厂家：	SONY CORPORATION
描述：	NICAM and SMATV RF MODULATOR/PLL NICAM和卫星电视共用天线射频调制器/ PLL 射频调制器电视
文件：	总18页 (文件大小：328K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

CXA3050M

NICAM and SMATV RF MODULATOR/PLL

Description

24 pin SOP (Plastic)

Fully synthesized I²C 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

Structure

• Accepts NICAM 6.552MHz QPSK input signal

• Accepts FM Stereo input signal

• I²C control of:

Bipolar silicon monolithic IC

Applications

a. Video RF Carrier Frequency

b. Sound Carrier Frequency

c. Modulation Depth (±2% Typ.)

d. FM Deviation (±8% Typ.)

• PAL and NTSC System VCR

• Satellite Receiver

• Set Top Box

• SMATV

e. P/S ratio (±1dB Typ.)

f. Nicam output enable to sleep

g. Video RF carrier enable to sleep

• On chip Regulator 3.1V

Recommended Operating Voltages (Ta = 25°C)

• Supply voltage

V^CC

5.0 ± 0.5

30 ± 0.5

• Supply for VCO Varactor

• Operating Temperature

–10 to +80 °C

Block Diagram

TPSG

NICAM

MIXER

AMP

VCO

PLL

VIDEO

MIXER

W/C-CLAMP

PLL

I²C-Interface

FM-OSC

PLL

REG

OSC

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.

– 1 –

E96331A66-ST

CXA3050M

– 2 –

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 I²C 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 I²C, 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 I²C

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

The amplitude of the FM signal is varied via I²C 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 I²C 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 I²C control will switch the Nicam signal output off or on.

– 3 –

CXA3050M

I²C Interface Data Format

Modulator Address

R/W

ask

over

mod

Data 1

ADJ1

ADJ0

Data 2

Data 3

Data 4

M12

M11

M10

MD2

PS2

MD1

PS1

MD0

PS0

ask

NIC

FM2

FM1

FM0

Sound Carrier Course Adjust

Sound Carrier

TV System

(Pre-emphasis)

Frequency

4.5MHz

5.5MHz

6.0MHz

6.5MHz

NTSC

PAL

Sound Carrier Fine Adjust

on chip

capacitance

ADJ1

ADJ0

df Adjust

–f

Normal

6.4pF

3.2pF

1.6pF

RF Power on (RF Amp & OSC)

Over Modulation Test

1 bit

OVM

1 bit

13 bits

2 bits

3 bits

1 bit

M12–MO

S1–S0

Main divider control data

Sound carrier frequency selection

ADJ1–ADJ0 Sound carrier frequency adjust (0 to 6.4RF)

MD2–MD0

PS2–PS0

Modulation Depth

Picture/Sound control

FM deviation adjust

Nicam Enable

NIC

M12

LSB

Main UHF PLL Divider

8191 to 2

MSB

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

– 4 –

CXA3050M

Software Application Notes

The minimum requirement to drive the CXA3050 and I²C 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.

Comments

Turns RF Amp, OSC on/off

Fine tune audio carrier

Function

RF Output Power

Delta Sound

Nominal Status

1/0

Course adjust for

4.5MHz (0)

Fsound

5.5MHz (1)

6.0MHz (2)

6.5MHz (3)

Check listing on page 10 for

frequency to hex conversation

Frequency mode

Mod depth

2 to 8191

Ranges mod depth from

72% to 86%, 80% (4)

FM Deviation

P/S Ratio

Sensitivity adjustable

Programmable in 8 steps of 1dB

Nicam Mixer on

Nicam on/off

Over Mod on/off

1/0

Increase Video modulation ratio

– 5 –

CXA3050M

Pin Description

Pin Voltage

Typical DC

Reference

No.

Equivalent circuit

Description

Vcc

Video-in

Video input

2.5V

Vcc

Chip voltage supply

regulator

Vreg

3.1V

MIXER

FMOSC

External Adjust Mod

depth.

2.5V

Mod-Adj

Audio input

Audio-in

10mA

Sound Carrier

oscillator tank

FM-Tank

4.0V

– 6 –

CXA3050M

No.

Pin Voltage

Typical DC

Reference

Equivalent circuit

Description

Vcc

Sound Carrier FM tank

loop filter. See page 2

for set up note

Audio-

Loop filter

2.02V

Vcc

4MHz input crystal

frequency

Xtal

1.5V

I²C Clocking signal

input

10 SCL

11 SDA

13 EF

5/0 V

0.7V

I²C Data signal input

Charge pump output

– 7 –

CXA3050M

No.

Pin Voltage

Typical DC

Reference

Equivalent circuit

Description

Phase detector

output

14 PDout

2.1V

OSC GND

OSC1

VCO Ground

UHF OSC

2.5V

1.7V

2.5V

OSC2

OSC3

OSC4

Oscillator supply

Voltage 5V

18 17

OSC V^CC

NICAM or FM

carrier input

22 Nicam-in

MIXER

RF output.

3.4V

Must be terminated

with 75Ω.

RF-OUT

Application Circuit Notes

1. RF output pin 24 should be connected to a 75Ω load in oder to measure accurate input level. Also note pin 24

has 2.7kΩ 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 I²C control)

the voltage on pin 6 should read 2.02V.

Set Fsound = 3

Delta Fsound = 1

– 8 –

CXA3050M

Specifications

Parameter

New Specification

–10 to 80°C

77.5 to 90%

±6.5%

Operating temperature range

Modulation Index

Diff. Gain 80 to 87.5% modulation

Deviation range (audio)

NICAM input level

±6.5 degree

±10kHz to ±100kHz

79dBµV

NICAM input resistance

Picture/sound ratio adj

Video modulation adj

1kΩ

1dB × 7steps

2% × 7steps

8% × 7steps

1dB × 7steps

±1kHz

Audio FM sensitivity

Picture/Sound ratio

Inter carrier accuracy

Parameter

Typ.

Max.

61.3

30.6

14.6

Unit

Condition

Min.

Analog

Current consumption

Full operation

digital

OSC

V^CC= 5.0V

9.6

4.5

–10

DC Supply operating range

Operating temperature range

Input level

5.0

Vdc

°C

–22

dBµV

dBc

KΩ

Output level

Conversion, Loss = 30dB

–20

–24

Input resistance

10e^–9

10e^–6

Bit error rate

Eye-height degradation

– 9 –

CXA3050M

RF Characteristics

Parameter

Condition

Min.

–7

Typ.

Max.

Unit

Ω

Output impedance

Output return loss

RF Output level

700MHz 75Ω termination

±2.5

±1

dBµV

RF Frequency respone

Picture/Sound ratio

VHF1 Frequency range

VHF2 Frequency range

UHF Frequency range 1

UHF Frequency range 2

RF Accuracy

Using attached application

dBc

MHz

kHz

MHz

kHz

dBc/Hz

120

230

860

800

±50

6.5

170

470

670

Using attached application

Inter-carrier frequency range

Inter-carrier accuracy

RF Carrier phase noise

Sound carrier phase noise

Hum modulation

4.5, 5.5, 6.0, 6.5

4.5

4.5, 5.5, 6.0, 6.5

±1

10kHz offset frequency

–84.7

–80

–60

–65

–60

–15

–60

–65

–55

–65

Chroma beat

–78

–63

dBc

C/N Ratio

1/2 Video band offset

RF Harmonics

dBc

Sub-carrier harmonics

NICAM Beat

Reference spurious frequency.

Spurious output level

15.625kHz

–60

– 10 –

CXA3050M

Video Characteristics

Parameter

Input resistance

Input voltage

Max.

Unit

KΩ

Vp-p

Condition

Min.

Typ.

100

80% Modulation

0.55

% Modulation Clipping

I²C control index

Modulation flatness

Modulation

±0.4

±1.4

7 steps

Band Limited (46CH to 60CH)

0.55p-p input (mod Adja)

mp (Ta = –10 to 80°C)

–mp (Ta = 25°C)

Modulation stability by temperature

±3

Field time distortion

Line time distortion

S/N

0.5

IRE

Weighted

–60

K Factor

With 2T pulse

Per standard

Video frequency response

±0.5

Audio Characteristics

Parameter

Input voltage

Typ.

Max.

Unit

Vp-p

KΩ

Condition

Min.

0.1

@50kHz, Deviation

Input resistance

Deviation range

Audio distribution

±10

±100

±15

kHz

4.5MHz

System M

4.5MHz ± 25kHz = 100% = 0dB

0.5

kHz/mV

System B/G

5.5MHz ± 50kHz = 100% = 0dB

0.33

0.404

Deviation sensitivity

System I

6MHz ± 50kHz = 100% = 0dB

System D/K

6.5MHz ± 50kHz = 100% = 0dB

Audio SNR

Quasi-Parallel, Detection

50 to 100%, Deviation

50 to 15kHz

–60

Harmonic distortion

Frequency response

FM Hum and noise

–1

±5

kHz

25 to 75kHz, Deviation

– 11 –

CXA3050M

E F

N C

S D A

P D O U T

O S C - G N D

S C L

O S C 1

C C D - V

X T A L

O S C 2

V C O 3

O S C 4

D - G N D

A L F

C C

O S C - V

T A N K

A N A L O G - V

A U D I O

M O D - A D J

V R E G

V I D E O

N I C A M - I N

A - G N D

R F O U T

– 12 –

CXA3050M

E F

N C

S D A

P D O U T

O S C - G N D

S C L

O S C 1

C C D - V

X T A L

O S C 2

V C O 3

O S C 4

D - G N D

A L F

C C

O S C - V

T A N K

A N A L O G - V

A U D I O

M O D - A D J

V R E G

V I D E O

N I C A M - I N

A - G N D

R F O U T

– 13 –

CXA3050M

E F

N C

S D A

P D O U T

O S C - G N D

S C L

O S C 1

C C D - V

X T A L

O S C 2

V C O 3

O S C 4

D - G N D

A L F

C C

O S C - V

T A N K

A N A L O G - V

A U D I O

M O D - A D J

V R E G

V I D E O

N I C A M - I N

A - G N D

R F O U T

– 14 –

CXA3050M

Example of Representative Characteristics

Vcc [V]

0.6

A : 4.5M

B : 5.5M

0.5

0.4

0.3

Vcc [V]

3.3

3.2

3.1

Video max.

Video 0.55Vp-p

3.0

2.9

600

700

800

900

RF Frequency [MHz]

Vcc [V]

– 15 –

CXA3050M

0.40

Without video

Video 87.5%

0.35

0.30

0.25

0.20

0.15

Vcc [V]

3.0

2.5

2.0

–1

–2

–3

1.5

1.0

0.5

3.5

4.5

5.5

6.5

Vcc [V]

1.0

0.5

1.0

0.5

–0.5

–1.0

–1.5

–2.0

–1.0

–1.5

–2.0

100

Audio f response [kHz]

200

Video f response [MHz]

– 16 –

CXA3050M

–40

–20

100

Temperature [degree]

Over mod test = OFF

Video 0.8Vp-p

100

64µsec

Over mod test = ON

Video 0.8Vp-p

100

64µsec

– 17 –

CXA3050M

Package Outline

Unit: mm

24PIN SOP (PLASTIC)

+ 0.4

15.0 – 0.1

+ 0.4

1.85 – 0.15

0.15

+ 0.2

0.1 – 0.05

0.45 ± 0.1

+ 0.1

0.2 – 0.05

1.27

± 0.12

PACKAGE STRUCTURE

MOLDING COMPOUND

EPOXY/PHENOL RESIN

SOLDER PLATING

COPPER ALLOY / 42ALLOY

0.3g

LEAD TREATMENT

LEAD MATERIAL

SONY CODE

EIAJ CODE

SOP-24P-L01

SOP024-P-0300-A

JEDEC CODE

PACKAGE WEIGHT

– 18 –

CXA3050 [SONY]

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