SONY CXA1929M

CXA1929M
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
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
RF-OUT
Analog GND
MOD-adj
Analog VCC
OSC VCC
OSC4
OSC3
OSC2
OSC1
OSC GND
PDout
EF
Block Diagram
24
23
22
21
20
19
18
17
16
15
14
13
AMP
VIDEO
MIXER
AMP
PLL
VCO
TPSG
W/C-CLAMP
FM-OSC
PLL
I2C-Interface
PLL
REG
ATT
Driver
Vreg
NTSC
Audio-in
PAL
Audio-in
FM-Tank
Audio-Loop
filter
7
8
9
10
11
12
A-driver
6
SDA
5
SCL
4
Digital-VCC
3
Xtal
2
Digital GND
1
Video-in
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—
E96514-TE
—2—
SCL
SDA
Video in
Modulation
depth
Audio in
PAL
Audio in
NTSC
B
I2C
Video
clamp
TPSG
OSC
4MHz
Switch
Multi-standard RF Modulator
Memory
Latch
CCT
video
limiter
62.5kHz B
Amp
Audio
Tank
Driver
out
ATT
Driver
Modulation
depth
FM Mod
PLL
Audio
Loop
Filter
V Reg
Regulator
P/S
control
divide
M
divide
8
Phase
detector
Buffer
×2
Mixer
and
Adder
A
62.5kHz 250kHz
B
divide
25
RF Amp
Analog
VCC Ground
4MHz
OSC
Loop
Filter
OSC
Digital
VCC
Digital
Ground
4MHz
XTAL
B
Loop filter
D
A
C
B
A
RF Output
CXA1929M
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—
CXA1929M
I2C Interface Data format
Modulator Address
Data 1
Data 2
Data 3
Data 4
1
RF
M12
M4
—
1
ADJ1
M11
M3
OSC
0
ADJ0
M10
M2
FM2
0
S1
M9
M1
FM1
1
S0
M8
M0
FM0
0
TPSG
M7
MD2
PS2
Sound Carrier Course Adjust
S1
S0
0
0
1
1
0
1
0
1
Sound Carrier
Frequency
4.5 MHz
5.5 MHz
6.0 MHz
6.5 MHz
TV System
(Pre-emphasis)
NTSC
PAL
PAL
PAL
Sound Carrier Fine Adjust
ADJ1
ADJ0
df Adjust
0
0
1
1
0
1
0
1
–f
Normal
+f
+f
on chip
capacitance
6.4 pF
3.2 pF
1.6 pF
0
RF
RF Power on (RF Amp & RF Mixer Driver)
TPSG
TEST Pattern Signal Generator
ATT
Local/distance external attenuator driver
OSC
Oscillator ON/OFF switch
OVM
Over Modulation Test
M12–MO
Main divider control data
S1–S0
Sound carrier frequency selection
ADJ1–ADJ0
Sound carrier frequency adjust (0 to 6.4 RF)
MD2–MD0
Modulation Depth
PS2–PS0
Picture/Sound control
FM
FM deviation adjust
M12
MO
Main UHF PLL Divider
MSB
LSB
8191 to 2
Video Carrier frequency calculated from = 125 (M+2) kHz
—4—
1 bit
1 bit
1 bit
1 bit
1 bit
13 bits
2 bits
2 bits
3 bits
3 bits
3 bits
0
OVM
M6
MD1
PS1
R/W
ATT
M5
MD0
PS0
ask
ask
ask
ask
ask
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
Normal Status
1/0
1
0
2 to 8191
4
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
FM deviation
P/S Ratio
Over Mod
4
4
1/0
TPSG
1/0
OSC on.
1/0
Turns oscillator ON/OFF
Attenuator Driver
1/0
Output logic ON/OFF
—5—
CXA1929M
Pin Description
Pin
No.
Reference
Pin Voltage
Typical DC
Equivalent circuit
Description
VCC
1
Video-in
2.5 V
Video input
1
VCC
2
Vreg
3.1 V
3
NTSC
Audio-in
2.5 V
PAL
Audio-in
10 mA
4
2
Chip voltage supply regulator
NTSC Audio input
3
PAL Audio input
4
5
5
FM-Tank
4.0 V
Sound Carrier oscillator tank
—6—
CXA1929M
Pin
No.
Reference
Pin Voltage
Typical DC
Equivalent circuit
Description
VCC
6
AudioLoop filter
2.02 V
Sound Carrier FM tank loop
filter. See page 2 for set up
note
6
VCC
8
Xtal
1.5 V
4 MHz input crystal frequency
8
10
SCL
5/0 V
11
SDA
5/0 V
13
EF
0.7 V
10
I2C Clocking signal input
11
I2C Data signal input
13
Charge pump output
—7—
CXA1929M
Pin
No.
Reference
Pin Voltage
Typical DC
14
PDout
2.1 V
15
OSC GND
0V
16
OSC 1
2.5 V
17
OSC 2
1.7 V
18
OSC 3
1.7 V
19
OSC 4
2.5 V
20
OSC VCC
5.V
Equivalent circuit
Description
14
Phase detector output
20
UHF OSC
15
19
18 17
16
MIXER
22
Mod-Adj
2.5 V
RF-OUT
3.4 V
Oscillator supply Voltage 5 V
FMOSC
22
24
24
VCO Ground
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—
CXA1929M
Specifications
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
—9—
Min.
29
31
6.0
4.5
–10
Typ.
36.6
38.6
7.5
5.0
Max.
44
47
9.0
7
80
Unit
mA
mA
mA
Vdc
°C
CXA1929M
RF Characteristics
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
Min.
Typ.
75
Max.
80.5
±2.5
±1
17.5
120
230
860
800
±50
6.5
±1
–80
–80
–60
–65
–60
–15
–58
–55
–65
4.2
0.1
–7
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
9.5
50
170
470
670
13.5
4.5
0
–84.7
–84.7
1/2 Video band offset
–74
–63
15.625 kHz
–65
–60
3.7
0
—10—
3.9
0.05
Unit
Ω
dB
dBµV
dB
dBc
MHz
MHz
MHz
MHz
kHz
MHz
kHz
dBc/Hz
dBc/Hz
dB
dBc
dB
dBc
dBc
dBc
dBc
V
V
CXA1929M
Video Characteristics
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
Condition
Min.
30
97
±0.4
±1
87
Unit
kΩ
Vp-p
%
%
%
%
±3
%
73
1
2
2
–60
2
±0.5
81
5
IRE
IRE
dB
%
dB
%
%
Typ.
Max.
0
±100
±15
Unit
Vp-p
kΩ
kHz
%
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
1
+1
±5
dB
%
dB
kHz
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)
73
0
0
Weighted
With 2T pulse
Per standard
TPSG ON
0
65
0
Typ.
100
0.46
93
2
80
0.5
0.5
–66
Max.
Audio Characteristics
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
—11—
Min.
0.1
20
±10
–1
C3
22pF
VIDEO-in
3
22k
NTSC
AUDIO
C4
22µF
R4
22k
L1
17µH
PAL
AUDIO
R5
180k
C9
22pF
C10
0.01µF
FM
TANK
5
C12
47µF
R7
240
ALF
6
GND
C15
22nF
D-GND
7
XTAL
VCC
9
D-VCC
4MHz-Xtal
8
SCL
SCL
C20
0.1µF
10
SDA
11
SDA
12
InF
R12
300
C28
1nF
C26
1nF
+30V
R14
200
R15
2k
R16
56k
GND
R13
200
P1
C27
20pF
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.
C8
330pF
4
C17
27pF
RFOUT
2
A-GND
1
13
14
15
16
17
MOD-ADJ
Q1
18
R11
20k
C24
0.01µF
C22
1nF
ANALOG-V
C19
220pF
19
C18
6pF
L2
25nH
C21
1nF
20
C16
2pF
R10
330
C25
1nF
C23
0.047µF
21
C14
6pF
1T363
GND
OSC-VCC
22
R3
100k
C13
220pF
C11
22pF
R8
20k
R9
20k
OSC4
23
R6
10
VCC
OSC
VCO3
24
R1
2.7k
C6
22pF
VCC
Analog
C7
1nF
OSC2
C2
0.33µF
C1
22pF
GND
OSC1
VIDEO
—12—
VREG
OSC-GND
NTSC
AUDIO-IN
PDOUT
PAL
AUDIO-IN
EF
ATT driver
OUT
RF OUT
Application Circuit 1
CXA1929M
C3
22pF
VIDEO
3
22k
NTSC
AUDIO
C4
22µF
2
1
AUDIO
PAL
R5
180k
C10
22pF
C11
0.01µF
5
C12
47µF
R7
240
L1
17µH
6
GND
C15
22nF
7
C18
27pF
9
VCC
4MHz-Xtal
8
SCL
C21
0.1µF
SDA
11
12
In
R12
300
GND
R15
2k
C28
1nF
R13
200
C27
1nF
+30V
R14
200
C29
20pF
P1
R16
56k
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.
C8
330pF
4
10
13
14
15
16
17
Q1
18
R4
22k
C23
1nF
R11
20k
C25
0.01µF
C22
1nF
19
C20
220pF
C26
1nF
C24
0.047µF
20
C19
6pF
R10
20k
GND
21
C13
220pF
C17
3pF
L3
14nH
1T363
C30
220pF
22
C9
22pF
C14
6pF
L2
14nH
C16
5pF
R9
20k
23
C6
22pF
R6
10
R8
20k
1T363
L = 14nH
24
R1
2.7k
C7
1nF
VCC
OSC
RFOUT
C2
0.33µF
C1
22pF
GND
VCC
Analog
A-GND
VIDEO
MOD-ADJ
VREG
ANALOG-V
NTSC
AUDIO-IN
OSC-VCC
PAL
AUDIO-IN
OSC4
FM
TANK
VCO3
ALF
OSC2
D-GND
OSC1
XTAL
OSC-GND
D-VCC
PDOUT
SCL
—13—
SDA
EF
ATT driver
OUT
RF OUT
Application Circuit 2
Dual-OSC
CXA1929M
C3
22pF
C4
22µF
VIDEO
NTSC
AUDIO
22k
3
AUDIO
PAL
R5
180k
C9
22pF
C10
0.01µF
FM
TANK
5
C12
47µF
R7
240
ALF
6
GND
C15
22nF
D-GND
7
XTAL
VCC
9
D-VCC
4MHz-Xtal
8
SCL
SCL
C21
0.1µF
10
SDA
11
SDA
12
InF
R12
300
C27
1nF
R13
200
P1
GND
+30V
R14
200
C28
1nF
R15
2k
C29
20pF
R16
56k
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.
C8
330pF
4
C17
27pF
RFOUT
2
A-GND
1
13
14
15
16
17
18
MOD-ADJ
Q1
19
L1
17µH
C23
1nF
R11
20k
C25
0.01µF
C22
1nF
ANALOG-V
C20
330pF
C26
1nF
C24
0.047µF
20
C18
120pF
L2
1µH
GND
21
C16
47pF
R9
510
C19
1nF
OSC-VCC
22
R4
22k
1T363
C14
120pF
R8
C11 20k
22pF
C13
330pF
R10
20k
OSC4
23
R6
10
VCC
OSC
VCO3
24
R1
2.7k
C6
22pF
VCC
Analog
C7
1nF
OSC2
C2
0.33µF
C1
22pF
GND
OSC1
VIDEO
—14—
VREG
OSC-GND
AUDIO-IN
NTSC
PDOUT
AUDIO-IN
PAL
EF
ATT driver
OUT
RF OUT
Application Circuit 3
VHF-Band
CXA1929M
CXA1929M
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82
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81
81
Video modulation [%]
RF out [dBµV]
Example of Representative Characteristics
80
79
80
79
78
78
4
5
4
6
5
6
VCC [V]
VCC [V]
0.6
20
P/S Ratio [dB]
FM Sencitivity [kHz/mw]
A : 4.5M
19
B : 5.5M
A
18
17
B
16
15
0.5
0.4
0.3
14
4
5
6
4
6
VCC [V]
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3.3
95
3.2
90
3.1
3.0
2.9
4
5
VCC [V]
Video modulation [%]
Regulatar out [V]
VCC [V]
5
Video max.
Video 0.55Vp-p
85
80
75
6
—15—
600
700
800
RF Frequency [MHz]
900
CXA1929M
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69
0.40
Without video
0.35
68
Audio S/N [dB]
Audio dist [%]
Video 87.5%
0.30
0.25
0.20
67
66
65
64
0.15
4
5
4
6
5
VCC [V]
VCC [V]
3.0
6
0
2.5
–1
D.P [degree]
DG [%]
2.0
1.5
1.0
–2
–3
0.5
0
3.5
4
4.5
5
5.5
6
6.5
4
0
–0.5
–1.0
–1.5
–2.0
1.0
0.5
Audio out [dB]
Video out [dB]
0.5
6
VCC [V]
VCC [V]
1.0
5
0
–0.5
–1.0
–1.5
–2.0
0
5
10
15
20
25
0
100
Audio f response [kHz]
Video f response [MHz]
—16—
200
CXA1929M
AA
AAAAAAAAA
AA
AA
AA
AA
AA
AAAAAAAAAAA
82
Video modulation [%]
81
80
79
78
77
76
–40
–20
0
20
40
60
80
100
Temperature [degree]
0
Over mod test = OFF
Video 0.8Vp-p
Video modulation [%]
20
40
60
80
100
64µsec
0
0
AA
AA
AA
AA
AA
AA
AA
AA
AA
AAAAAAAAAAAA
AA
A
AA
Over mod test = ON
Video 0.8Vp-p
Video modulation [%]
20
40
60
80
100
64µsec
0
—17—
CXA1929M
Unit : mm
24PIN SOP (PLASTIC)
+ 0.4
15.0 – 0.1
24
+ 0.4
1.85 – 0.15
13
6.9
+ 0.2
0.1 – 0.05
12
0.45 ± 0.1
1.27
+ 0.1
0.2 – 0.05
0.5 ± 0.2
1
7.9 ± 0.4
0.15
+ 0.3
5.3 – 0.1
Package Outline
± 0.12 M
PACKAGE STRUCTURE
MOLDING COMPOUND
EPOXY/PHENOL RESIN
SONY CODE
SOP-24P-L01
LEAD TREATMENT
SOLDER PLATING
EIAJ CODE
∗SOP024-P-0300-A
LEAD MATERIAL
COPPER ALLOY / 42ALLOY
PACKAGE WEIGHT
0.3g
JEDEC CODE
—18—