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CXA3050M
NICAM and SMATV 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 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
Analog GND Analog VCC NICAM-in OSC VCC
24 pin SOP (Plastic)
Structure Bipolar silicon monolithic IC Applications * PAL and NTSC System VCR * Satellite Receiver * Set Top Box * SMATV Recommended Operating Voltages (Ta = 25C) * Supply voltage VCC 5.0 0.5 V * Supply for VCO Varactor 30 0.5 V * Operating Temperature -10 to +80 C
RF-OUT
OSC GND
OSC4
OSC1
OSC2
PDout
14 PLL 11
OSC3
24
23
22
21
20
19
18
17
16
15
13
AMP
NICAM MIXER VIDEO MIXER
AMP VCO AMP
TPSG W/C-CLAMP FM-OSC REG PLL OSC PLL I2C-Interface
1
2
3
4
5
6
7
8
9
10
12
Vreg
Digital-VCC
Mod-adj
Digital GND
Audio-Loop filter
Video-in
Audio-in
SCL
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.
FM-Tank
-1-
SDA
Xtal
NC
EF
E96331A66-ST
Multi-standard RF Modulator
Audio Loop Audio Filter Tank SMATV Nicam in Analog VCC Ground Digital VCC Digital Ground
Audio in NTSC Amp FM Mod PLL B RF Amp Mixer and Adder P/S control NICAM Mixer
Switch
Audio in PAL 62.5kHz
RF Output A B
Modulation depth
Video in video limiter Modulation depth
Video clamp
Buffer x2
OSC C D A Loop Filter Loop filter B
-2-
divide 8 Memory Latch CCT divide M Phase detector Regulator V Reg
SDA
I2C
divide 25
4MHz OSC
XTAL 4MHz B A 62.5kHz 250kHz
SCL
B
4MHz
CXA3050M
Fig. 1
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 Data 1 Data 2 Data 3 Data 4 1 PD M12 M4 X 1 ADJ1 M11 M3 NIC 0 ADJ0 M10 M2 FM2 0 S1 M9 M1 FM1 1 S0 M8 M0 FM0 0 over mod M7 MD2 PS2 0 X M6 MD1 PS1 R/W X M5 MD0 PS0 ask ask ask ask ask
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 TV System (Pre-emphasis) NTSC PAL PAL PAL
Sound Carrier Fine Adjust 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 1 bit 1 bit 13 bits 2 bits 2 bits 3 bits 3 bits 3 bits 1 bit
PD RF Power on (RF Amp & OSC) OVM Over Modulation Test M12-MO Main divider control data S1-S0 Sound carrier frequency selection ADJ1-ADJ0 Sound carrier frequency adjust (0 to 6.4RF) MD2-MD0 Modulation Depth PS2-PS0 Picture/Sound control FM FM deviation adjust NIC Nicam Enable 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 RF Output Power Delta Sound
Nominal Status 1/0 1
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
Fsound
0
Frequency mode Mod depth FM Deviation P/S Ratio Nicam on/off Over Mod on/off
2 to 8191 4 4 4 1/0 1/0
-5-
CXA3050M
Pin Description Pin No. Reference Pin Voltage Typical DC Equivalent circuit
Vcc
Description
1
Video-in
2.5V
1
Video input
Vcc
2
Vreg
3.1V
2
Chip voltage supply regulator
MIXER
FMOSC
3
Mod-Adj
2.5V
3
External Adjust Mod depth.
4
Audio-in
10mA
4
Audio input
5
5
FM-Tank
4.0V
Sound Carrier oscillator tank
-6-
CXA3050M
Pin No.
Reference
Pin Voltage Typical DC
Equivalent circuit
Vcc
Description
6
AudioLoop filter
2.02V
6
Sound Carrier FM tank loop filter. See page 2 for set up note
Vcc
8
Xtal
1.5V
8
4MHz input crystal frequency
10
SCL
5/0 V
10
I2C Clocking signal input
11
11
SDA
5/0 V
I2C Data signal input
13
EF
0.7V
13
Charge pump output
-7-
CXA3050M
Pin No.
Reference
Pin Voltage Typical DC
Equivalent circuit
Description
14
14
PDout
2.1V
Phase detector output
15 16 17 18 19 20
OSC GND OSC1 OSC2 OSC3 OSC4 OSC VCC
0V 2.5V 1.7V 1.7V 2.5V 5V
19 18 17 16
20
VCO Ground UHF OSC
15
Oscillator supply Voltage 5V
22
22
Nicam-in
2V
NICAM or FM carrier input
24
MIXER
24
RF-OUT
3.4V
RF output. Must be terminated with 75.
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 I2C control) the voltage on pin 6 should read 2.02V. Set Fsound = 3 Delta Fsound = 1 -8-
CXA3050M
Specifications 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 New Specification -10 to 80C 77.5 to 90% 6.5% 6.5 degree 10kHz to 100kHz 79dBV 1k 1dB x 7steps 2% x 7steps 8% x 7steps 1dB x 7steps 1kHz
Parameter Current consumption Full operation VCC = 5.0V DC Supply operating range Operating temperature range Input level Output level Input resistance Bit error rate Eye-height degradation Analog digital OSC
Condition
Min. 40 20 9.6 4.5 -10
Typ. 50 25 12 5.0
Max. 61.3 30.6 14.6 7 75
Unit mA mA mA Vdc C dBV
79 Conversion, Loss = 30dB -20 -22 1 10e-9 10e-6 10 -24
dBc K
%
-9-
CXA3050M
RF Characteristics 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 C/N Ratio RF Harmonics Sub-carrier harmonics NICAM Beat Reference spurious frequency. Spurious output level 15.625kHz -60 1/2 Video band offset -78 -63 4.5, 5.5, 6.0, 6.5 4.5, 5.5, 6.0, 6.5 10kHz offset frequency 10kHz offset frequency 4.5 0 -84.7 -84.7 Using attached application 700MHz 75 termination Using attached application 10 50 170 470 670 -7 79 2.5 1 17 120 230 860 800 50 6.5 1 -80 -80 -60 -65 -60 -15 -60 -65 -55 -65 Condition Min. Typ. 75 Max. Unit dB dBV dB dBc MHz MHz MHz MHz kHz MHz kHz dBc/Hz dBc/Hz dB dBc dB dBc dBc dBc dBc dBc
- 10 -
CXA3050M
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 Weighted With 2T pulse Per standard 0 7 steps Band Limited (46CH to 60CH) 0.55p-p input (mod Adja) mp (Ta = -10 to 80C) -mp (Ta = 25C) 0 0 0.5 0.5 73 80 2 80% Modulation Condition Min. 30 Typ. 100 0.55 97 0.4 1.4 87 3 2 2 -60 2 0.5 Max. Unit K Vp-p % % % % % IRE IRE dB % dB
Audio Characteristics Parameter Input voltage Input resistance Deviation range Audio distribution 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 Audio SNR Harmonic distortion Frequency response FM Hum and noise Quasi-Parallel, Detection 50 to 100%, Deviation 50 to 15kHz 25 to 75kHz, Deviation -1 Condition @50kHz, Deviation Min. 0.1 20 10 0 0.5 0.33 0.404 0.404 -60 1 +1 5 100 15 Typ. Max. Unit Vp-p K kHz % kHz/mV kHz/mV kHz/mV kHz/mV dB % dB kHz
Deviation sensitivity
- 11 -
Application Circuit 1
GND
GND
RF OUT C11 22pF C21 1nF C19 220pF C22 1nF R11 20k 21 20 16 19 18 17 15 14 13 C24 0.01F Q1 C27 20pF C13 220pF C14 6pF C16 2pF C18 6pF 1T363 R10 330 L2 25nH R8 20k C25 1nF C23 0.047F R12 300 R16 56k
GND
NICAM
VCC Analog C7 1nF R9 20k R6 10 C6 22pF
VCC OSC
C1 22pF
R1 2.7k
R2 75
C5 1nF
P1
24
23
22
EF
OSC4
OSC2
RFOUT
A-GND
VCO3
OSC1
NICAM-IN
OSC-VCC
ANALOG-V
OSC-GND
PDOUT
R13 200 C26 1nF
R15 2k C28 1nF
VREG
AUDIO
ALF
XTAL
SCL
VIDEO
MOD-ADJ
TANK
D-GND
D-VCC
SDA
NC
- 12 -
4 7 C17 27pF 8 C10 0.01F C9 22pF R7 240 C12 47F C15 22nF 4MHz-Xtal C20 0.1F R5 180k L1 17H 5 6 9 10 11 12 AUDIO GND VCC SCL SDA
R14 200
1
2
3
+30V
R3 100k
R4 22k
C2 0.33F
C4 22F
C3 22pF
C8 330pF
VIDEO
CXA3050M
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.
Application Circuit 2 Dual-OSC
RF OUT L = 14nH C7 1nF 1T363 R6 10 1T363 L2 14nH C14 6pF C20 220pF R11 20k 15 14 13 16 C17 3pF C19 6pF C23 1nF C25 0.01F Q1 C16 5pF L3 14nH R10 20k C6 22pF C9 22pF C13 220pF 19 18 17 21 20 R8 20k C22 1nF R12 300 C26 1nF C24 0.047F R16 56k
GND
NICAM
VCC Analog R9 20k C30 220pF GND GND
VCC OSC
C1 22pF
R1 2.7k
R2 75
C5 1nF
P1
24
23
22
C29 20pF
EF
OSC4
OSC2
RFOUT
A-GND
VCO3
OSC1
NICAM-IN
OSC-VCC
ANALOG-V
OSC-GND
PDOUT
R13 200 C27 1nF
R15 2k C28 1nF
VREG
AUDIO
ALF
XTAL
SCL
VIDEO
MOD-ADJ
TANK
D-GND
D-VCC
SDA
NC
- 13 -
4 7 C18 27pF 8 C11 0.01F C10 22pF R7 240 C12 47F C15 22nF 4MHz-Xtal C21 0.1F R5 180k L1 17H 5 6 9 10 AUDIO GND VCC SCL
R14 200
1
2
3
11
12
+30V
R3 100k
R4 22k
C2 0.33F
C4 22F
C3 22pF
C8 330pF
VIDEO
SDA
CXA3050M
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.
Application Circuit 3 VHF-Band
GND
GND
RF OUT R12 300
GND
NICAM
VCC Analog C7 1nF VCC OSC R10 20k C22 1nF C20 330pF C23 1nF R11 20k 21 20 16 19 18 17 15 14 13 C25 0.01F Q1 C26 1nF C24 0.047F C19 1nF R6 10 1T363 C6 22pF C14 120pF C16 47pF C18 120pF R9 510 L2 1H R8 C11 20k 22pF C13 330pF
C1 22pF
R1 2.7k
R2 75
C5 1nF
24
23
22
OSC4
OSC2
RFOUT
A-GND
VCO3
OSC1
PDOUT
EF
R16 56k
NICAM-IN
OSC-VCC
OSC-GND
ANALOG-V
P1 R13 200 C27 1nF
C29 20pF R15 2k
VREG
AUDIO
ALF
XTAL
SCL
VIDEO
MOD-ADJ
TANK
D-GND
D-VCC
SDA
NC
- 14 -
4 7 C17 27pF 8 C10 0.01F C9 22pF R7 240 L1 17H 5 6 9 10 R5 180k C12 47F C15 22nF 4MHz-Xtal C21 0.1F AUDIO GND VCC SCL
1
2
3
11
12
C28 1nF
R3 100k
R4 22k
C2 0.33F
C4 22F
R14 200
C3 22pF
C8 330pF
+30V
VIDEO
SDA
CXA3050M
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
Example of Representative Characteristics
80
82
79
81
78
Video modulation [%]
RF out [dBV]
80
77
79
76
78
4
5 Vcc [V]
6
4
5 Vcc [V]
6
0.6 20 19 A : 4.5M A 18 17 B 16 15 14 B : 5.5M
FM Sencitivity [kHz/mw]
6
0.5
P/S Ratio [dB]
0.4
0.3
4
5 Vcc [V]
4
5 Vcc [V]
6
3.3
95
3.2
Video modulation [%]
90
Video max. Video 0.55Vp-p
Regulatar out [V]
3.1
85
3.0
80
2.9
75
4
5 Vcc [V]
6
600
700
800
900
RF Frequency [MHz]
- 15 -
CXA3050M
0.40 0.35 Without video Video 87.5%
69 68
Audio dist [%]
0.30 0.25 0.20 0.15
Audio S/N [dB]
67 66 65 64
4
5 Vcc [V]
6
4
5 Vcc [V]
6
3.0 2.5
0
-1
1.5 1.0 0.5 0 3.5
D.P [degree]
4 4.5 5 Vcc [V] 5.5 6 6.5
2.0
DG [%]
-2
-3
4
5 Vcc [V]
6
1.0 0.5
1.0 0.5
Video out [dB]
Audio out [dB]
0 -0.5 -1.0 -1.5 -2.0 0 5 10 15 20 25 Video f response [MHz]
0 -0.5 -1.0 -1.5 -2.0 0 100 Audio f response [kHz] 200
- 16 -
CXA3050M
82 81
Video modulation [%]
80 79 78 77 76 -40 -20 0 20 40 60 80 100 Temperature [degree]
0 Over mod test = OFF Video 0.8Vp-p 20
Video modulation [%]
40
60
80
100 0 64sec
0 Over mod test = ON Video 0.8Vp-p 20
Video modulation [%]
40
60
80
100 0 64sec
- 17 -
CXA3050M
Package Outline
Unit: mm
24PIN SOP (PLASTIC)
+ 0.4 15.0 - 0.1 24 13
+ 0.4 1.85 - 0.15
0.15
+ 0.3 5.3 - 0.1
7.9 0.4
+ 0.2 0.1 - 0.05
0.45 0.1
1.27
+ 0.1 0.2 - 0.05
0.12 M
PACKAGE STRUCTURE
MOLDING COMPOUND SONY CODE EIAJ CODE JEDEC CODE SOP-24P-L01 SOP024-P-0300-A LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY/PHENOL RESIN SOLDER PLATING
COPPER ALLOY / 42ALLOY
0.3g
- 18 -
0.5 0.2
1
12
6.9

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