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Features
* 5-V Supply Voltage * Gain-controlled 3-stage Wide-band IF Amplifier * Active Carrier Generation by FPLL Principle (Frequency-Phase-Locked-Loop) for True
Quadrature Demodulation
* Complete Alignment-free AM Demodulator * Switchable Amplitude Detector for Gain Control, which Operates as a Peak Detector for
FM Sound and as a Mean Level Detector for AM Sound
Description
The U4468B is an integrated bipolar circuit for full multistandard sound IF signal processing in TV/VTR and multimedia applications. It supplies AM signals as well as FM/NICAM sound IF signals and thus allows the design of a universal sound IF module for various applications.
Quasi-split Sound Circuit and AM Demodulator IC U4468B
Figure 1. Block Diagram
VS 4 14 REF IF-amp
Loop filter 5 FPLL 05 905 VCO 8 9 VCO
IFFM 2 1 IFAM
12 Intercarrier (FM)
Mean 3 AGC Peak level 13 IF AGC Mean/peak 7 S1 Mute AM-det 10 S2 6 AF (AM)
Rev. 4777A-TVVCR-01/04
Circuit Description
IF Amplifier and AGC
The symmetrical IF input signal from the external SAW filter is fed to the pins 1 and 2. In case of FM/NICAM applications, a SAW filter with double band-pass characteristic is required for the vision and sound carrier. In case of the L-standard, a band-pass filter with the center frequency at the L-sound carrier is used. The amplifier consists of three AC-coupled wide-band IF stages. Each differential amplifier stage is gain controlled by the AGC (Automatic Gain Control) voltage, available at pin 3. The output signal of the IF amplifier is then applied to the FPLL carrier generation, to the mixer for FM/NICAM signals and to the AM demodulator. The IF-AGC is derived from the average level of the AM carrier (L-standard) or from the peak value of the FM carrier (e.g., B/G standard). It controls the three-stage wide-band amplifier to provide a constant SIF signal to the AM demodulator or to the QSS (quasisplit sound) mixer.
Standard Switch
If the standard switch (pin 7) is in position "low" (for AM sound), the AGC is operating as an average level detector. In position "open" or "high" (for FM/NICAM sound), the AGC acts as a peak value detector. The internal band gap reference voltage (4.25 V at pin 4) ensures constant performance, independent of supply voltage and temperature. The FPLL (frequency-phase-locked loop) circuit consists of a frequency detector and a phase detector to generate a control voltage for the VCO tuning. In locked mode, the VCO is controlled by the phase detector while in unlocked mode, the frequency detector is superimposed. The VCO operates with an external resonance circuit (L and C parallel) and is controlled by integrated varicaps. A practicable VCO alignment of the external coil is the adjustment of the loop filter voltage (pin 5) to 2.3 V. At this value, the capture and hold range are centered.
Internal Voltage Stabilizer FPLL, VCO
AM Demodulator
The alignment-free AM demodulator is realized by a synchronous detector. The modulated IF signal from the wide-band IF amplifier output is multiplied in phase with the limited SIF signal to remove the AM. Then, the resulting AF signal of the demodulator output is fed to the output amplifier and to the AGC stage.
Quasi-Split-Sound (QSS) The QSS mixer is realized by a multiplier circuit. The IF signal (FM/NICAM) is converted to the intercarrier frequency by means of a quadrature signal from the generated picture Mixer
carrier provided by the PLL. The intercarrier signal is fed via an output amplifier to pin 12.
Mute Switch
The AM sound output (pin 6) can be muted by switching the pulling mute switch (pin 10) to "low".
2
U4468B
4777A-TVVCR-01/04
U4468B
Pin Configuration
Figure 2. Pinning DIP16
VIIF
1 2 3 4
16 NC 15 NC 14 VS 13 GND
VIIF
CAGC CREF LF VO,AM
U4468B
5 6 7 8 12 VO,FM
11 NC 10 VSW,MUTE 9 VVCO
VSW,AGC VVCO
Pin Description
Pin 1, 2 3 4 5 6 7 8, 9 10 12 13 14 11, 15, 16 Symbol VI,IF CAGC CREF LF VO,FM VSW,AGC VVCO VO,FM GND VS NC Function IF input (symmetrical) Capacitor for the AGC time constant Capacitor for the internal reference voltage Loop filter AF output (AM sound) Standard switch VCO circuit Intercarrier output (FM sound) Ground Supply voltage (5 V) Not connected
VSW,MUTE Mute switch
3
4777A-TVVCR-01/04
Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Reference point pin 13, unless otherwise specified. Parameters Supply voltage range Supply current Power dissipation (VS = 9 V) Output currents External voltages Junction temperature Operating temperature range Storage temperature Electrostatic handling(1) Note: All 6, 12 1 - 4, 6, 12 5, 8, 9 7, 10 Tj Tamb Tstg VESD Vext Pin 14 14 Symbol Vs Is P Iout Value 4.5 to 9.0 55 500 5 +4.5 +3.5 Vs +125 0 to +85 -25 to +125 300 Unit V mA mW mA V V V C C C V
1. Equivalent to discharging a 200-pF capacitor through a 0-W resistor
Thermal Resistance
Parameters Junction ambient when soldered to PCB Symbol RthJA Value 60 Unit K/W
4
U4468B
4777A-TVVCR-01/04
U4468B
Electrical Characteristics
VS = +5 V, Tamb = +25C; reference point pin 13, unless otherwise specified.
Parameters DC Supply (Pin 14) Supply voltage Supply current IF Input (Pins 1, 2) Minimum IF input signal Maximum IF input signal Input impedance Input capacitance SIF-AGC (Pin 3) IF gain control range AGC capacitor FPLL and VCO (Pins 5, 8, and 9) Maximum oscillator frequency Vision carrier capture range Oscillator drift (free running) as function of temperature Standard Switch (Pin 7) Switching voltage for mode 1: FM/NICAM sound Switching voltage for mode 2: AM sound Switching current AM Mute Switch (Pin 10) Switching voltage Switching voltage Switching current Intercarrier Output (Pin 12) DC output voltage Output resistance Intercarrier output signal Intercarrier bandwidth Notes: 1. 2. 3. 4.
(1) (4)
Test Conditions
Symbol VS
Min. 4.5
Typ. 5.0 40 50
Max. 9.0
Unit V mA Vrms mVrms kW pF dB F MHz
Vin =10 mV or V3 = 2 V Output signal: -3 dB Output signal: +1 dB
(1) (1)
IS vin vin Rin Cin Gv CAGC 60 70
100 1.2 2 65 4.7
For carrier generation fVCO = 38.9 MHz CVCO = 6.2 pF DTamb = 55C, fVCO = 38.9 MHz CVCO = 6.2 pF(2)
fVCO Dfcap Df/DT
70 1.5 2
MHz
-0.3
%
Peak value control(3) Average level control
Vsw1 Vsw2 Isw
2.0 0 100 open 0 -100 2
VS 1.5
V V A
AM output active AM output switched off
Vmute1 Vmute2 Imute VDC Rout Vout B 100
1.5
V A V
200 150 TBD TBD
W mVrms MHz MHz
vin = 10 mV 5.5 MHz output signal -1 dB -3 dB
This parameter is given as an application information and is not tested during production. The oscillator drift is related to the picture carrier frequency, with an external temperature-compensated LC circuit. Without external control voltage (pin 7 open), the IC automatically operates in mode 1. Picture carrier PC = 38.9 MHz; sound carrier SC1 = 33.4 MHz, SC2 = 33.16 MHz; PC/SC1 =13 dB; PC/SC2 = 20 dB; PC unmodulated (equivalent to sync peak level). 5. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; vin = 10 mV.
5
4777A-TVVCR-01/04
Electrical Characteristics (Continued)
VS = +5 V, Tamb = +25C; reference point pin 13, unless otherwise specified.
Parameters Test Conditions B/G mod. VIF signal: vin =10 mV FM deviation = 27 kHz fmod = 1 kHz Tested with U2860B Black screen: channel 1/2 Color bar: channel 1/2 Tested from pin 14 to 12(1) RR IAC IDC VDC
(1)
Symbol
Min.
Typ.
Max.
Unit
Weighted signal-to-noise ratio (CCIR 468)
60/58 58/56 35 0.7 -2 2.2 150 500 TBD 1 56 28 0.3 -1 2
dB dB dB mA mA V W mVrms kHz % dB dB mA mA
Ripple rejection Allowable AC output peak current Allowable DC output current AF Output - AM (Pin 6) DC output voltage Output resistance AF output signal AF bandwidth Total harmonic distortion Weighted signal-to-noise ratio (CCIR 468) Ripple rejection Allowable AC output peak current Allowable DC output current Notes: 1. 2. 3. 4.
Rout voAF B THD S/N RR IAC IDC
(5)
m = 54%(5) -3 dB m = 54% fmod = 1 kHz, 12.5 kHz Reference: m = 54%(5) fmod = 1 kHz Tested from pin 14 to 6(1)
This parameter is given as an application information and is not tested during production. The oscillator drift is related to the picture carrier frequency, with an external temperature-compensated LC circuit. Without external control voltage (pin 7 open), the IC automatically operates in mode 1. Picture carrier PC = 38.9 MHz; sound carrier SC1 = 33.4 MHz, SC2 = 33.16 MHz; PC/SC1 =13 dB; PC/SC2 = 20 dB; PC unmodulated (equivalent to sync peak level). 5. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; vin = 10 mV.
6
U4468B
4777A-TVVCR-01/04
U4468B
Figure 3. Test Circuit
VS +5 V 22 F 270 Rx SFT 5.74 MA 10 nF 10 F 14 680 13 12 11 10 9 500
2.2 F 2.2 F 8
U2860B
680 1 2 3 4 5 6 7
SFT 5.5MA
3.3 k 15 nF
3.3 k 15 nF
Intercarrier frequency VS 22 F
Mute
Squelch
AF2
AF1
+5 V
10 nF S2 Mute NC
VCO (38.9 MHz) 9 L1
NC 16
NC 15 14 13 12
11
10
Standard B/G
U4468B
1 2 3 4 5 6 S1 150 AF (AM) 7 8 AGC (Mean/Peak)
8.2 pF
IF
33.4 MHz
38.9 MHz
4.7 F Standard L
4.7 F 470 nF
32.4 MHz
7
4777A-TVVCR-01/04
Internal Pin Configuration
Figure 4. Sound IF Inputs (Pins 1 and 2)
10 k 10 k 2.3 V 2 k 2 2 k
1
Figure 5. AGC Time Constant (Pin 3)
3
Figure 6. Internal Reference Voltage (Pin 4)
4 4.25 V 3.5 V
Figure 7. Loop Filter (Pin 5)
5
2.75 V
8
U4468B
4777A-TVVCR-01/04
U4468B
Figure 8. AM Output (Pin 6)
1.45 V 6 100
1 mA
IDC
Figure 9. AGC Switch (Pin 7)
3.5 V 17 k 7 15.5 k
23 k
Figure 10. VCO (Pins 8 and 9)
3 k 8
3 k 9
Figure 11. Mute Switch (Pin 10)
3.5 V 20 k 10 20 k 2.6 V
9
4777A-TVVCR-01/04
Figure 12. Intercarrier Output (Pin 12)
12
120
1.4 mA
IDC
Ordering Information
Extended Type Number U4468B Package DIP16 Remarks -
Package Information
Package DIP16
Dimensions in mm
20.0 max 7.82 7.42
4.8 max 6.4 max 0.5 min 3.3 1.64 1.44 Alternative 16 0.58 0.48 17.78 9 0.39 max 9.75 8.15
2.54
technical drawings according to DIN specifications
1
8
10
U4468B
4777A-TVVCR-01/04
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4777A-TVVCR-01/04
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