Datasheet CXA3050M Datasheet (Sony)

NICAM and SMATV RF MODULATOR/PLL

Description

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

• Accepts NICAM 6.552MHz QPSK input signal

• Accepts FM Stereo input signal

• I2C 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 VCC 5.0 ± 0.5 V

• Supply for VCO Varactor 30 ± 0.5 V

• Operating Temperature –10 to +80 °C

CXA3050M

24 pin SOP (Plastic)

CC

CC

Analog GND

NICAM-in

NICAM
MIXER

VIDEO
MIXER

FM-OSC

3

Mod-adj

Analog V

21

4

Audio-in

20

RF-OUT

23

24

AMP

W/C-CLAMP

1

Video-in

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.

22

2

Vreg

OSC V

AMP
AMP

PLL

5

FM-Tank

OSC4

19

18

TPSG

6

7

filter

Audio-Loop

OSC3

17

VCO

OSCREG

Digital GND

OSC2

8

Xtal

OSC1

16

9

CC

Digital-V

OSC GND

15

2

I

10

SCL

14

C-Interface

11

PDout

PLL

PLL

SDA

EF

13

12

NC

– 1 –

E96331A66-ST

Ground

A

RF Output

CXA3050M

B

C

A

D

B

Loop filter

XTAL

4MHz

Digital

Analog Digital

SMATV

Audio

Loop

Audio

CC

V

VCC Ground

Nicam in

Tank

Filter

NICAM

Mixer

P/S

control

PLL

FM Mod

RF Amp

and

Mixer

B62.5kHz

Adder

OSC

× 2

Buffer

depth

Modulation

8

divide

Loop

Filter

OSC

4MHz

25

divide

Phase

detector

M

divide

A

B

250kHz

62.5kHz

Regulator

Fig. 1

V Reg

Switch Amp

Audio in

NTSC

Multi-standard RF Modulator

Audio in

PAL

Modulation

depth

video

limiter

Video

clamp

Video in

– 2 –

Memory

2

SDA

CCT

Latch

C
I

B 4MHz

SCL

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 –

I2C Interface Data Format

CXA3050M

Modulator Address

Data 1
Data 2

Data 3
Data 4

1100100R/Wask

PD

M12

M4

X

Sound Carrier Course Adjust

S1

0
0
1
1

S0

0
1
0
1

Sound Carrier
Frequency

4.5MHz

5.5MHz

6.0MHz

6.5MHz

Sound Carrier Fine Adjust

ADJ1

M11

M3

NIC

TV System
(Pre-emphasis)

ADJ0

M10

M2

FM2

NTSC

PAL
PAL
PAL

S1

M9
M1

FM1

S0

M8
M0

FM0

over
mod

M7

MD2

PS2

X

M6

MD1

PS1

X

M5

MD0

PS0

ask
ask

ask
ask

ADJ1

0
0
1
1

ADJ0

0
1
0
1

df Adjust

–f

Normal

+f
+f

on chip
capacitance

6.4pF

3.2pF

1.6pF
0

PD RF Power on (RF Amp & OSC) 1 bit
OVM Over Modulation Test 1 bit
M12–MO Main divider control data 13 bits
S1–S0 Sound carrier frequency selection 2 bits
ADJ1–ADJ0 Sound carrier frequency adjust (0 to 6.4RF) 2 bits
MD2–MD0 Modulation Depth 3 bits
PS2–PS0 Picture/Sound control 3 bits
FM FM deviation adjust 3 bits
NIC Nicam Enable 1 bit
M12 MO Main UHF PLL Divider
MSB LSB 8191 to 2
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.

Function Nominal Status
RF Output Power
Delta Sound

Fsound

Frequency mode

Mod depth
FM Deviation

P/S Ratio
Nicam on/off
Over Mod on/off

1/0

1

0

2 to 8191

4
4

4
1/0
1/0

Comments

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

– 5 –

Pin Description

CXA3050M

Pin
No.

1

2

Reference

Video-in

Vreg

Pin Voltage
Typical DC

2.5V

3.1V

Equivalent circuit Description

Vcc

1

Vcc

2

Video input

Chip voltage supply
regulator

3

4

Mod-Adj

Audio-in

2.5V

10mA

MIXER

3

FMOSC

External Adjust Mod
depth.

Audio input

4

5

FM-Tank

4.0V

5

Sound Carrier
oscillator tank

– 6 –

CXA3050M

Pin
No.

6

8

Reference

Audio­Loop filter

Xtal

Pin Voltage
Typical DC

2.02V

1.5V

Equivalent circuit Description

Vcc

6

Sound Carrier FM tank
loop filter. See page 2
for set up note

Vcc

4MHz input crystal
frequency

8

10

11

13

SCL

SDA

EF

5/0 V

5/0 V

0.7V

10

11

13

I2C Clocking signal
input

I2C Data signal input

Charge pump output

– 7 –

CXA3050M

Pin
No.

14

15

16

17

18

19

Reference

PDout

OSC GND

OSC1

OSC2

OSC3

OSC4

Pin Voltage
Typical DC

2.1V

0V

2.5V

1.7V

1.7V

2.5V

Equivalent circuit Description

14

Phase detector
output

20

VCO Ground

UHF OSC

15

20

22

24

OSC VCC

Nicam-in

RF-OUT

5V

2V

3.4V

24

19

22

18

17

16

MIXER

Oscillator supply
Voltage 5V

NICAM or FM
carrier input

RF output.
Must be terminated
with 75Ω.

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 –

Specifications

CXA3050M

Parameter
Operating temperature range
Modulation Index
Diff. Gain 80 to 87.5% modulation
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

Parameter

Current consumption
Full operation
VCC = 5.0V

New Specification

–10 to 80°C

77.5 to 90%

±6.5 degree

±10kHz to ±100kHz

79dBµV

1dB × 7steps

2% × 7steps
8% × 7steps

1dB × 7steps

Condition
Analog
digital
OSC

±6.5%

1kΩ

±1kHz

Min.

40
20

9.6

Typ.

50
25
12

Max. Unit

61.3

30.6

14.6

mA
mA

mA
DC Supply operating range
Operating temperature range
Input level
Output level
Input resistance
Bit error rate
Eye-height degradation

Conversion, Loss = 30dB

4.5

–10

–20

5.0

79

–22

10e

7

75

Vdc

°C

dBµV

–24

1

–9

10e

10

dBc

KΩ

–6

%

– 9 –

RF Characteristics

CXA3050M

Parameter
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

Condition

700MHz 75Ω termination
Using attached application

Using attached application

4.5, 5.5, 6.0, 6.5

4.5, 5.5, 6.0, 6.5
10kHz offset frequency
10kHz offset frequency

Min.

–7

10

50
170
470
670

4.5
0

Typ.

75

79

–84.7
–84.7

–78

Max. Unit

Ω

dB

±2.5

±1

17
120
230
860
800
±50

6.5
±1

–80
–80
–60
–65

dBµV

dB

dBc
MHz
MHz
MHz
MHz

kHz
MHz

kHz

dBc/Hz
dBc/Hz

dB

dBc

C/N Ratio
RF Harmonics
Sub-carrier harmonics
NICAM Beat
Reference spurious frequency.
Spurious output level

1/2 Video band offset

15.625kHz

–63

–60

–60
–15
–60
–65
–55
–65

dB
dBc
dBc
dBc
dBc
dBc

– 10 –

Video Characteristics

CXA3050M

Parameter
Input resistance
Input voltage
% Modulation Clipping
I2C control index
Modulation flatness
Modulation

Modulation stability by temperature
Field time distortion

Line time distortion
S/N
K Factor
Video frequency response

Audio Characteristics

Condition

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

Min.

30

73

0
0

0

Typ.

100

0.55

2

80

0.5

0.5

Max. Unit

KΩ

Vp-p

97
±0.4
±1.4

87

±3

2
2

–60

2

±0.5

%
%
%
%

%

IRE
IRE

dB

%

dB

Parameter
Input voltage
Input resistance
Deviation range
Audio distribution

Deviation sensitivity

Audio SNR
Harmonic distortion
Frequency response
FM Hum and noise

Condition

@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

Min.

0.1
20

±10

–1

Typ.

0

0.5

0.33

0.404

0.404

Max. Unit

Vp-p

KΩ

±100

±15

kHz

%

kHz/mV

kHz/mV

kHz/mV

kHz/mV

–60

1
+1
±5

dB

%

dB

kHz

– 11 –

GND

R12

300

C27

R16

20pF

56k

P1

R152kC28

200

R13

C26

1nF

1nF

R14

CXA3050M

200

+30V

GND

R9

CC VCC

V

C25

20k

OSC

Analog

C7

1nF

R8

1nF

C23

C21

20k

C11

22pF

R6

0.047µF

1nF

10

C19

L2

25nH

330

R10

1T363

C13

Q1

220pF

220pF

C6

22pF

75

R2

C24

C22

C18

C16

C14

0.01µF

1nF

6pF

2pF

6pF

C5

R11

1nF

20k

13

14

15

16

17

18

19

20

21

22

23

EF

CC

PDOUT

OSC1

OSC2

VCO3

OSC4

OSC-V

A-GND

OSC-GND

ANALOG-V

NICAM-IN

NC

SDA

SCL

D-V

CC

XTAL

D-GND

ALF

TANK

AUDIO

MOD-ADJ

VREG

12

11

10

9

8

7

6

5

4

3

2

C17

C10

R4

R3

27pF

L1

0.01µF

22k

100k

17µH

C4

C9

R7

22pF

22µF

240

C20

0.1µF

4MHz-Xtal

C15

22nF

C12

47µF

R5

180k

C8

330pF

VCC SCL SDA

GND

AUDIOVIDEO

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.

RF OUT GND NICAM

Application Circuit 1

R1

C1

2.7k

22pF

24

RFOUT

– 12 –

VIDEO

1

C2

C3

22pF

0.33µF

GND

R12

300

R16

56k

C29

P1

20pF

R152kC28

200

R13

C27

1nF

1nF

R14

CXA3050M

200

+30V

CC VCC

V

GND

C30

220pF

R9

20k

L = 14nH

Analog OSC

C26

C7

1nF

C24

C22

1T363

1nF

0.047µF

1nF

R10

1T363

R8

20k

10

R6

L3

C16

L2

20k

14nH

5pF

14nH

C6

R2

Q1

C25

C23

22pF

75

0.01µF

1nF

C20

C19

C17

C14

C13

C9

220pF

6pF

3pF

6pF

220pF

22pF

C5

R11

1nF

20k

13

14

15

16

17

18

19

20

21

22

23

CC

EF

PDOUT

OSC1

OSC2

VCO3

OSC4

OSC-V

A-GND

OSC-GND

ANALOG-V

NICAM-IN

NC

SDA

SCL

D-V

CC

XTAL

D-GND

ALF

TANK

AUDIO

MOD-ADJ

VREG

12

11

10

9

8

7

6

5

4

3

2

C18

C11

R4

R3

27pF

L1

0.01µF

22k

100k

17µH

C4

C10

R7

22pF

22µF

240

C21

0.1µF

4MHz-Xtal

C15

22nF

C12

47µF

R5

180k

C8

330pF

VCC SCL SDA

GND

AUDIOVIDEO

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.

RF OUT GND NICAM

Application Circuit 2

Dual-OSC

R1

C1

2.7k

22pF

24

RFOUT

– 13 –

VIDEO

1

C2

C3

22pF

0.33µF

CXA3050M

GND

GND

C19

R10

CC VCC

V

C26

1nF

20k

OSC

Analog

C7

R12

1nF

R8

1nF

300

C24

C22

20k

C11

R6

0.047µF

1nF

C20

L2

R9

1T363

22pF

10

1µH

510

C13

R2

Q1

C25

C23

330pF

330pF

C6

22pF

75

0.01µF

1nF

C18

C16

C14

R11

120pF

47pF

120pF

C5

1nF

20k

R16

13

14

15

16

17

18

19

20

21

22

23

56k

CC

EF

C29

P1

PDOUT

OSC1

OSC2

VCO3

OSC4

OSC-V

A-GND

R15

20pF

R13

OSC-GND

ANALOG-V

NICAM-IN

2k

200

C27

C28

1nF

SCL

CC

XTAL

ALF

AUDIO

VREG

1nF

NC

12

SDA

11

10

D-V

9

8

D-GND

7

6

TANK

5

4

MOD-ADJ

3

2

C17

C10

R4

R3

27pF

L1

0.01µF

22k

100k

R14

17µH

C4

200

C9

R7

22pF

22µF

240

+30V

C21

0.1µF

4MHz-Xtal

C15

22nF

C12

47µF

R5

180k

C8

330pF

VCC SCL SDA

GND

AUDIOVIDEO

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.

RF OUT GND NICAM

Application Circuit 3

VHF-Band

R1

C1

2.7k

22pF

24

RFOUT

– 14 –

VIDEO

1

C2

C3

22pF

0.33µF

Example of Representative Characteristics

CXA3050M

80

79

78

77

RF out [dBµV]

76

20
19

18
17
16

P/S Ratio [dB]

15
14

Video modulation [%]

456

Vcc [V]

A : 4.5M

A

B

B : 5.5M

82

81

80

79

78

456

0.6

0.5

0.4

FM Sencitivity [kHz/mw]

0.3

Vcc [V]

3.3

3.2

3.1

3.0

Regulatar out [V]

2.9

456

Vcc [V]

Video modulation [%]

456

Vcc [V]

95

90

85

80

75

456

Vcc [V]

Video max.
Video 0.55Vp-p

600 700 800 900

RF Frequency [MHz]

– 15 –

CXA3050M

A

A

A

A

A

A

0.40

0.35

0.30

0.25

Audio dist [%]

0.20

0.15

3.0

2.5

2.0

1.5

DG [%]

1.0

0.5

Without video
Video 87.5%

Audio S/N [dB]

456

Vcc [V]

D.P [degree]

69

68

67

66

65

64

456

Vcc [V]

0

–1

–2

–3

0

3.5 4 4.5 5 5.5 6 6.5
Vcc [V]

1.0

0.5

0

–0.5

Video out [dB]

–1.0

–1.5

–2.0

0 5 10 15 20 25

Video f response [MHz]

1.0

0.5

0

–0.5

Audio out [dB]

–1.0

–1.5

–2.0

0

456

Vcc [V]

100 200

Audio f response [kHz]

– 16 –

82

81

80

79

78

Video modulation [%]

77

76

–40 –20 0 20 40 60 80 100

Temperature [degree]

0

Over mod test = OFF
Video 0.8Vp-p

20

CXA3050M

40

60

Video modulation [%]

80

100

0

0

20

40

60

Video modulation [%]

64µsec

Over mod test = ON
Video 0.8Vp-p

80

100

0

64µsec

– 17 –

Package Outline Unit: mm

CXA3050M

24PIN SOP (PLASTIC)

+ 0.4

15.0 – 0.1

1324

+ 0.3

5.3 – 0.1

7.9 ± 0.4

112

1.270.45 ± 0.1

± 0.12

M

6.9

0.2 – 0.05

+ 0.1

PACKAGE STRUCTURE

SONY CODE
EIAJ CODE
JEDEC CODE

SOP-24P-L01
∗SOP024-P-0300-A

MOLDING COMPOUND

LEAD TREATMENT
LEAD MATERIAL

PACKAGE WEIGHT

EPOXY/PHENOL RESIN
SOLDER PLATING

COPPER ALLOY / 42ALLOY

0.3g

+ 0.4

1.85 – 0.15

0.15

+ 0.2

0.1 – 0.05

0.5 ± 0.2

– 18 –