Datasheet CXA1929M Datasheet (Sony)

TV RF MODULATOR/PLL

For the availability of this product, please contact the sales office.

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 125

kHz steps

• ATT Driver

• I2C control of:

a. Video RF Carrier Frequency
b. Sound Carrier Frequency
c. Modulation Depth (±2.5 % Typ.)
d. FM Deviation (±7 % Typ.)
e. P/S ratio (±1 dB Typ.)
f. Nicam output enable to sleep
g. Video RF carrier enable to sleep

• On chip Regulator 3.1 V

CXA1929M

24 pin SOP (Plastic)

Applications

• PAL and NTSC System VCR

• Satellite Receiver

• Set Top Box

Structure

Bipolar silicon monolithic IC

Recommended Operating Voltages (Ta=25 °C)

• Supply voltage VCC 5.0±0.5 V

• Supply for VCO Varactor –30 to +0.5 °C

• Operating Temperature –10 to +80 °C

Block Diagram

CC

CC

OSC V

AMP

PLL

FM-Tank

Audio-Loop

OSC4

TPSG

filter

Analog GND

RF-OUT

AMP

W/C-CLAMP

REG

Vreg

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.

Analog V

MOD-adj

VIDEO
MIXER

FM-OSC

3 8

Audio-in

PAL

Audio-in

NTSC

OSC3

VCO

OSC

7 91 2 4 5 6

Digital GND

OSC2

Xtal

OSC1

151620212223 1924 13141718

CC

Digital-V

OSC GND

I2C-Interface

1110 12

SCL

PDout

PLL

PLL

SDA

EF

ATT

Driver

A-driver

—1—

E96514-TE

Digital

Ground

A

RF Output

CXA1929M

B

C

A

D

B

Loop filter

XTAL

4MHz

Analog Digital

Audio

Loop

Audio

CC

V

CC Ground

V

Tank

Filter

P/S

control

PLL

FM Mod

RF Amp

and

Mixer

B

Adder

OSC

× 2

Buffer

depth

Modulation

Loop

8

divide

Filter

OSC

4MHz

25

divide

Phase

detector

M

divide

B A

62.5kHz 250kHz

Regulator

ATT

Driver

V Reg

out

Driver

Amp

Switch

Audio in

NTSC

Multi-standard RF Modulator

62.5kHz

Audio in

PAL

Modulation

depth

video

limiter

Video

clamp

Video in

—2—

OSC

TPSG

Latch

Memory

SDA

C

2

I

CCT

4MHz

B

SCL

CXA1929M

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 4.5 MHz (NTSC) or 5.5, 6.0, 6.5 MHz
(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 2.0 V).
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 1 dB steps between the range 10 dB and 17 dB (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 15.625 kHz. The reference signal is derived from a 4 MHz
crystal oscillator feeding a –256 divider. The UHF oscillator covers the frequency range 471 MHz to 855 MHz
in frequency steps of 125 kHz. This is adequate for the UHF NTSC and PAL TV channels (471.25MHz (CH21)
to 855.25 MHz (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 6.522 MHz Nicam signal subcarrier QPSK at 728 K 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

CXA1929M

Modulator Address

Data 1
Data 2
Data 3
Data 4

1100100R/Wask

RF ADJ1 ADJ0 S1 S0 TPSG OVM ATT ask

M12 M11 M10 M9 M8 M7 M6 M5 ask

M4 M3 M2 M1 M0 MD2 MD1 MD0 ask

— OSC FM2 FM1 FM0 PS2 PS1 PS0 ask

Sound Carrier Course Adjust

S1 S0

00
01
10
11

Sound Carrier

Frequency

4.5 MHz

5.5 MHz

6.0 MHz

6.5 MHz

Sound Carrier Fine Adjust

ADJ1 ADJ0

00
01
10
11

df Adjust

–f

Normal

+f
+f

TV System

(Pre-emphasis)

NTSC

PAL
PAL
PAL

on chip

capacitance

6.4 pF

3.2 pF

1.6 pF
0

RF RF Power on (RF Amp & RF Mixer Driver) 1 bit
TPSG TEST Pattern Signal Generator 1 bit
ATT Local/distance external attenuator driver 1 bit
OSC Oscillator ON/OFF switch 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 6.4 RF) 2 bits
MD2–MD0 Modulation Depth 3 bits
PS2–PS0 Picture/Sound control 3 bits
FM FM deviation adjust 3 bits
M12 MO Main UHF PLL Divider
MSB LSB 8191 to 2
Video Carrier frequency calculated from = 125 (M+2) kHz

—4—

CXA1929M

Software Application Notes

The minimum requirement to drive the CXA3050 and I2C bus drive is a 386/486 with 4 M bytes hard disk
space, 16 MHz 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
RF Output Power
Delta Sound

Fsound

Frequency mode

Mod depth
FM deviation

P/S Ratio
Over Mod

TPSG

OSC on.

Normal Status

1/0

1

0

2 to 8191

4
4

4

1/0
1/0

1/0

Comments
Turns RF Amp on/off
Fine tune audio carrier
Course adjust for

4.5 MHz (0)

5.5 MHz (1)

6.0 MHz (2)

6.5 MHz (3)
Check listing on page 10 for
frequency to hex conversation
Ranges mod depth from
72 % to (4)
Sensitivity adjustable
Programmable in 8 steps of 1 dB
Increase Video modulation ratio
Sets internal test pattern
generator ON/OFF

Turns oscillator ON/OFF

Attenuator Driver

1/0

Output logic ON/OFF

—5—

Pin Description

CXA1929M

Pin

No.

1

2

Reference

Video-in

Vreg

Pin Voltage

Typical DC

2.5 V

3.1 V

Equivalent circuit

VCC

1

VCC

2

Video input

Chip voltage supply regulator

Description

3

4

5

NTSC

Audio-in

PAL

Audio-in

FM-Tank

2.5 V

10 mA

4.0 V

NTSC Audio input

3

PAL Audio input

4

5

Sound Carrier oscillator tank

—6—

CXA1929M

Pin
No.

6

8

Reference

Audio-

Loop filter

Xtal

Pin Voltage

Typical DC

2.02 V

1.5 V

Equivalent circuit

VCC

Description

Sound Carrier FM tank loop

6

filter. See page 2 for set up
note

VCC

4 MHz input crystal frequency

8

10

11

13

SCL

SDA

EF

5/0 V

5/0 V

0.7 V

10

11

13

I2C Clocking signal input

I2C Data signal input

Charge pump output

—7—

CXA1929M

Pin

No.

14

15

16

17

18

19

Reference

PDout

OSC GND

OSC 1

OSC 2

OSC 3

OSC 4

Pin Voltage

Typical DC

2.1 V

0 V

2.5 V

1.7 V

1.7 V

2.5 V

Equivalent circuit

14

Phase detector output

VCO Ground

20

UHF OSC

15

Description

20

22

24

OSC VCC

Mod-Adj

RF-OUT

5.V

2.5 V

3.4 V

19 1718 16

MIXER

22

24

Oscillator supply Voltage 5 V

FMOSC

External Adjust Mod depth.

MIXER

RF output.
Must be terminated with 75 Ω.

Application Circuit Notes

1. RF output pin 24 should be connected to a 75 Ω load in order to measure accurate input level. Also note
pin 24 has 2.7 kΩ 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 6.5 MHz setting (set by I2C
control) the voltage on pin 6 should read 2.02 V

Set Fsound = 3
Delta Fsound = 1

—8—

Specifications

CXA1929M

Parameter
Operating temperature range
Modulation index
Diff. Gain 80 to 87.5 % modulation
Diff. Gain 80 to 87.5 % modulation
Deviation range (audio)
Picture/sound ratio adj
Video modulation adj
Audio FM sensitivity
Picture/Sound ratio
Inter carrier accuracy

Parameter
Current consumption
Full operation
VCC = 5 V
DC Supply operating range
Operating temperature range

New Specification

–10 to 80 °C

77.5 to 90 %
±6.5 %

±6.5 degree

±10 kHz to ±100 kHz

1 dB × 7 steps

2.5 % × 7 steps
7 % × 7 steps

1 dB × 7 steps

±1 kHz

Condition
Analog
digital
OSC

Min. Typ. Max. Unit

29 36.6 44 mA
31 38.6 47 mA

6.0 7.5 9.0 mA

4.5 5.0 7 Vdc

–10 80 °C

—9—

RF Characteristics

CXA1929M

Parameter
Output impedance
Output reture loss
RF Output level
RF Frequency respone
Picture/Sound ratio
VHF1 Frequency range
VHF 2 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
Reference spurious frequency.
Spurious output level
ATT driver ON
ATT driver OFF

Condition

700 MHz 75 Ω termination
Using attached application

Using attached application

4.5, 5.5, 6.0, 6.5

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

1/2 Video band offset

15.625 kHz

Min. Typ. Max. Unit

75 Ω

–7 dB

80.5 ±2.5 dBµV
±1 dB

9.5 13.5 17.5 dBc
50 120 MHz

170 230 MHz
470 860 MHz
670 800 MHz

±50 kHz

4.5 6.5 MHz

0 ±1 kHz

–84.7 –80 dBc/Hz
–84.7 –80 dBc/Hz

–60 dB
–74 –65 dBc
–63 –60 dB

–15 dBc
–65 –58 dBc
–60 –55 dBc

–65 dBc

3.7 3.9 4.2 V
0 0.05 0.1 V

—10—

Video Characteristics

CXA1929M

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
TPSG modulation
Sync crush level

Audio Characteristics

Condition

80 % Modulation

7 steps
Band Limited (46 CH to 60 CH)

0.46 p-p input (mod Adja)
mp (Ta = –10 to 80 °C)
–mp (Ta = 25 °C)

Weighted
With 2T pulse
Per standard
TPSG ON

Min. Typ. Max. Unit

30 100 kΩ

0.46 Vp-p
93 97 %

2 ±0.4 %

±1 %

73 80 87 %

±3 %

0 0.5 2 IRE
0 0.5 2 IRE

–66 –60 dB

2%

0 ±0.5 dB

65 73 81 %

015%

Parameter
Input Voltage
Input resistance
Deviation range
Audio distribution

Deviation sensitivity

adj=(3)

Audio SNR
Harmonic distortion
Frequency response
FM Hum and noise

Condition

@50 kHz, Deviation

4.5 MHz
System M

4.5 MHz ±25 kHz=100 %=0 dB
System B/G

5.5 MHz ±50 kHz=100 %=0 dB
System I
6 MHz ±50 kHz=100 %=0 dB
System D/K

6.5 MHz ±50 kHz=100 %=0 dB
Quasi-Parallel, Detection
50 to 100 %, Deviation
50 to 15 kHz
25 to 75 kHz, Deviation

Min. Typ. Max. Unit

0.1 Vp-p
20 kΩ

±10 ±100 kHz

0 ±15 %

0.354 0.407 0.468 kHz/mV

0.263 0.303 0.348 kHz/mV

0.334 0.384 0.441 kHz/mV

0.399 0.459 0.528 kHz/mV
–60 dB

1%

–1 +1 dB

±5 kHz

—11—

GND

C25

R12

1nF

300

C23

CXA1929M

R16

56k

R152kC28

1nF

R14

200

+30V

200

C27

20pF

Q1

0.047µF

C24

0.01µF

P1

1314151617182021222324 19

R13

EF

1nF

C26

PDOUT

OUT
ATT driver

SDA

InF

GND

R9

CC VCC

V

20k

OSC

C7

R8

1nF

C21

20k

C11

22pF

R6

1nF

10

C19

L2

25nH

330

R10

1T363

C13

C22

220pF

220pF

C6

22pF

1nF

C18

C16

C14

6pF

2pF

6pF

R11

20k

CC

OSC1

OSC2

VCO3

OSC4

OSC-V

A-GND

OSC-GND

ANALOG-V

MOD-ADJ

SCL

D-V

CC

XTAL

D-GND

ALF

TANK
FM

AUDIO-IN
PAL

AUDIO-IN
NTSC

VREG

C10

R3

C17

R4

100k

27pF

L1

0.01µF

22k

17µH

C4

C9

R7

22pF

22µF

240

22k

C20

0.1µF

4MHz-Xtal

C15

22nF

C12

47µF

R5

180k

C8

330pF

VCC SCL SDA

GND

PAL

AUDIO

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 and other right due to same.

NTSC

AUDIO

RF OUT GND Analog

Application Circuit 1

R1

C1

2.7k

22pF

RFOUT

—12—

VIDEO

1 2 3 4 5 6 7 8 9 10 11 12

C2

C3

22pF

VIDEO-in

0.33µF

GND

C26

R12

1nF

300

C24

CXA1929M

56k

R16

Q1

0.047µF

C25

C29

R152kC28

20pF

R13

P1

EF

1314151617182021222324 19

0.01µF

200

1nF

1nF

C27

PDOUT

R14

200

+30V

OUT
ATT driver

SDA

In

CC VCC

V

GND

C30

220pF

R9

20k

L = 14nH

Analog OSC

C7

C22

1T363

R8

1nF

1nF

R10

1T363

20k

10

R6

20k

L3

C16

L2

14nH

5pF

14nH

C6

C23

C19

C17

C14

C9

22pF

1nF

C20

C13

220pF

6pF

3pF

6pF

220pF

22pF

R11

20k

CC

OSC1

OSC2

VCO3

OSC4

OSC-V

A-GND

OSC-GND

ANALOG-V

MOD-ADJ

SCL

D-V

CC

XTAL

D-GND

ALF

TANK
FM

AUDIO-IN
PAL

AUDIO-IN
NTSC

VREG

10 11 12

C21

0.1µF

VCC SCL SDA

C18

27pF

L1

17µH

C11

0.01µF

C10

R4

22k

3

C4

22µF

R7

22pF

240

22k

4MHz-Xtal

C15

22nF

C12

47µF

R5

180k

C8

330pF

GND

PAL

AUDIO

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 and other right due to same.

NTSC

AUDIO

RF OUT GND

Application Circuit 2

Dual-OSC

R1

C1

2.7k

22pF

RFOUT

—13—

VIDEO

1 2 4 5 6 7 8 9

C2

C3

22pF

VIDEO

0.33µF

CXA1929M

GND

GND

C19

R10

CC VCC

V

C26

1nF

20k

OSC

C7

R12

1nF

R8

1nF

300

C24

C22

20k

C11

R6

0.047µF

1nF

L2

R9

22pF

10

C20

330pF

1µH

510

1T363

C13

330pF

C6

Q1

C25

C23

22pF

0.01µF

1nF

C18

C16

C14

R11

120pF

47pF

120pF

20k

R16

1314151617182021222324 19

56k

CC

EF

C29

P1

PDOUT

OSC1

OSC2

VCO3

OSC4

OSC-V

A-GND

2k

R15

20pF

200

R13

OSC-GND

ANALOG-V

MOD-ADJ

C27

1nF

OUT
ATT driver

SDA

SCL

D-V

CC

XTAL

D-GND

ALF

TANK
FM

PAL
AUDIO-IN

NTSC
AUDIO-IN

VREG

C28

1nF

C17

C10

R4

27pF

L1

0.01µF

22k

R14

17µH

C4

200

C9

R7

22pF

22µF

240

+30V

InF

C21

4MHz-Xtal

C15

22nF

C12

47µF

R5

180k

C8

330pF

22k

0.1µF

VCC SCL SDA

GND

PAL

AUDIO

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 and other right due to same.

NTSC

AUDIO

RF OUT GND Analog

Application Circuit 3

VHF-Band

R1

C1

2.7k

22pF

RFOUT

—14—

VIDEO

1 2 3 4 5 6 7 8 9 10 11 12

C2

C3

22pF

VIDEO

0.33µF

Example of Representative Characteristics

CXA1929M

82

81

80

79

RF out [dBµV]

78

20
19

18
17
16

P/S Ratio [dB]

15
14

Video modulation [%]

456

VCC [V]

A : 4.5M

A

B

B : 5.5M

FM Sencitivity [kHz/mw]

82

81

80

79

78

0.5

0.4

0.6

0.3

456

V

CC [V]

VCC [V]

3.3

3.2

3.1

3.0

Regulatar out [V]

2.9

456

Video modulation [%]

456

CC [V]

V

95

90

85

80

75

456

VCC [V]

Video max.
Video 0.55Vp-p

600 700 800 900

RF Frequency [MHz]

—15—

CXA1929M

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

CC [V]

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

CXA1929M

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

CXA1929M

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—