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
Quasi-split
Sound Circuit
and AM
Demodulator IC
Peak Detector for FM Sound and as a Mean Level Detector for AM
Sound
• Pb-free Package, which is Compliant with Requirements of RoHS
1. 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.
Figure 1-1.
U4468B
Block Diagram
VS
4
Loop
filter
14
5
REF
IFFM
2
8
05
905
FPLL
VCO
VCO
9
IF-amp
12
1
Intercarrier
(FM)
IFAM
Mean
3
6
AF (AM)
AGC
AM-det
Peak
level
7
13
IF AGC
Mean/peak
10
S1
Mute
S2
Rev. 4777B–TVVCR–07/05
2. Circuit Description
2.1
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 (quasi-split sound) mixer.
2.2
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.
2.3
Internal Voltage Stabilizer
The internal band gap reference voltage (4.25V at pin 4) ensures constant performance, independent of supply voltage and temperature.
2.4
FPLL, VCO
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.
2.5
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.
2.6
Quasi-Split-Sound (QSS) Mixer
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 carrier provided by the PLL. The intercarrier signal is fed via an output amplifier to pin 12.
2.7
Mute Switch
The AM sound output (pin 6) can be muted by switching the pulling mute switch (pin 10) to “low”.
2
U4468B
4777B–TVVCR–07/05
U4468B
3. Pin Configuration
Figure 3-1.
Pinning DIP16
VIIF
1
16 NC
VIIF
2
15 NC
CAGC
3
14 VS
CREF
4
13 GND
LF
5
12
VO,AM
6
11 NC
VSW,AGC
7
10 VSW,MUTE
VVCO
8
9
U4468B
Table 3-1.
VVCO
Pin Description
Pin
Symbol
1, 2
VI,IF
3
CAGC
Capacitor for the AGC time constant
4
CREF
Capacitor for the internal reference voltage
5
LF
6
VO,FM
7
VSW,AGC
8, 9
10
VO,FM
VVCO
Function
IF input (symmetrical)
Loop filter
AF output (AM sound)
Standard switch
VCO circuit
VSW,MUTE Mute switch
12
VO,FM
13
GND
Intercarrier output (FM sound)
Ground
14
VS
Supply voltage (5V)
11, 15, 16
NC
Not connected
3
4777B–TVVCR–07/05
4. 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
Pin
Symbol
Value
Supply voltage range
14
Vs
4.5 to 9.0
V
Is
55
mA
P
500
mW
Iout
5
mA
+4.5
V
Vext
+3.5
V
Vs
V
+125
°C
Tamb
0 to +85
°C
Tstg
–25 to +125
°C
VESD
±300
V
Symbol
Value
Unit
RthJA
60
K/W
Supply current
14
Power dissipation (VS = 9 V)
Output currents
6, 12
1-4, 6, 12
External voltages
5, 8, 9
7, 10
Junction temperature
Tj
Operating temperature range
Storage temperature
(1)
Electrostatic handling
Note:
All
Unit
1. Equivalent to discharging a 200-pF capacitor through a 0-Ω resistor
5. Thermal Resistance
Parameters
Junction ambient when soldered to PCB
4
U4468B
4777B–TVVCR–07/05
U4468B
6. Electrical Characteristics
VS = +5V, Tamb = +25°C; reference point pin 13, unless otherwise specified.
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
VS
4.5
5.0
9.0
Unit
DC Supply (Pin 14)
Supply voltage
Supply current
V
Vin =10 mV or V3 = 2V
IS
40
mA
Output signal: –3 dB
vin
50
µVrms
IF Input (Pins 1, 2)
Minimum IF input signal
Maximum IF input signal
Output signal: +1 dB
vin
100
mVrms
Input impedance
(1)
Rin
70
1.2
kΩ
Input capacitance
(1)
Cin
2
pF
65
dB
4.7
µF
SIF-AGC (Pin 3)
IF gain control range
Gv
AGC capacitor
60
CAGC
FPLL and VCO (Pins 5, 8, and 9)
Maximum oscillator frequency
For carrier generation
fVCO
70
Vision carrier capture range
fVCO = 38.9 MHz
CVCO = 6.2 pF
∆fcap
±1.5
Oscillator drift (free running) as
function of temperature
∆Tamb = 55°C,
fVCO = 38.9 MHz
CVCO = 6.2 pF(2)
∆f/∆T
Switching voltage for mode 1:
FM/NICAM sound
Peak value control(3)
Vsw1
Switching voltage for mode 2:
AM sound
Average level control
Vsw2
MHz
±2
MHz
–0.3
%
2.0
VS
V
0
1.5
V
Standard Switch (Pin 7)
Switching current
Isw
±100
µA
AM Mute Switch (Pin 10)
Switching voltage
AM output active
Vmute1
Switching voltage
AM output switched off
Vmute2
Switching current
open
0
1.5
Imute
–100
VDC
2
V
µA
(4)
Intercarrier Output (Pin 12)
DC output voltage
Output resistance
(1)
Rout
Intercarrier output signal
vin = 10 mV
5.5 MHz output signal
Vout
Intercarrier bandwidth
–1 dB
–3 dB
Notes:
V
200
100
B
Ω
150
mVrms
TBD
TBD
MHz
MHz
1. This parameter is given as an application information and is not tested during production.
2. The oscillator drift is related to the picture carrier frequency, with an external temperature-compensated LC circuit.
3. Without external control voltage (pin 7 open), the IC automatically operates in mode 1.
4. 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
4777B–TVVCR–07/05
6. Electrical Characteristics (Continued)
VS = +5V, Tamb = +25°C; reference point pin 13, unless otherwise specified.
Parameters
Test Conditions
Weighted signal-to-noise ratio
(CCIR 468)
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
Ripple rejection
Tested from pin 14 to 12(1)
Symbol
Min.
Typ.
Max.
60/58
58/56
RR
Unit
dB
dB
35
dB
Allowable AC output peak current
IAC
±0.7
mA
Allowable DC output current
IDC
–2
mA
AF Output - AM (Pin 6)
DC output voltage
Output resistance
2.2
VDC
(1)
150
Rout
(5)
V
Ω
voAF
500
mVrms
B
TBD
kHz
m = 54%
fmod = 1 kHz, 12.5 kHz
THD
1
Weighted signal-to-noise ratio
(CCIR 468)
Reference: m = 54%(5)
fmod = 1 kHz
S/N
56
Ripple rejection
Tested from pin 14 to 6(1)
RR
AF output signal
m = 54%
AF bandwidth
–3 dB(5)
Total harmonic distortion
2
%
dB
28
dB
Allowable AC output peak current
IAC
±0.3
mA
Allowable DC output current
IDC
–1
mA
Notes:
1. This parameter is given as an application information and is not tested during production.
2. The oscillator drift is related to the picture carrier frequency, with an external temperature-compensated LC circuit.
3. Without external control voltage (pin 7 open), the IC automatically operates in mode 1.
4. 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
4777B–TVVCR–07/05
U4468B
Figure 6-1.
Test Circuit
VS
+5 V
22 µF
270 Ω
Rx
500 Ω
10 nF
SFT 5.74 MA
10 µF
13
14
12
11
2.2 µF
2.2 µF
10
9
8
5
6
7
680 Ω
U2860B
680 Ω
1
2
3
4
3.3 kΩ
3.3 kΩ
SFT 5.5MA
15 nF
Intercarrier
frequency
Mute
Squelch
15 nF
AF2
AF1
VS
+5 V
22 µF
10 nF
NC
NC
16
15
VCO
(38.9 MHz)
Mute
S2
NC
14
13
12
11
10
9
L1
Standard B/G
IF
33.4
MHz
38.9
MHz
U4468B
1
2
3
4.7 µF
Standard L
4
5
8.2 pF
6
7
S1
4.7 µF 470 nF
8
AGC
(Mean/Peak)
150 Ω
AF (AM)
32.4 MHz
7
4777B–TVVCR–07/05
7. Internal Pin Configuration
Figure 7-1.
Sound IF Inputs (Pins 1 and 2)
10 kΩ
10 kΩ
2.3 V
2 kΩ
2 kΩ
2
1
Figure 7-2.
AGC Time Constant (Pin 3)
3
Figure 7-3.
Internal Reference Voltage (Pin 4)
4
4.25 V
3.5 V
Figure 7-4.
Loop Filter (Pin 5)
5
2.75 V
8
U4468B
4777B–TVVCR–07/05
U4468B
Figure 7-5.
AM Output (Pin 6)
1.45 V
6
100 Ω
1 mA
IDC
Figure 7-6.
AGC Switch (Pin 7)
3.5 V
17 kΩ
15.5 kΩ
7
23 kΩ
Figure 7-7.
VCO (Pins 8 and 9)
3 kΩ
3 kΩ
8
Figure 7-8.
9
Mute Switch (Pin 10)
3.5 V
20 kΩ
10
2.6 V
20 kΩ
9
4777B–TVVCR–07/05
Figure 7-9.
Intercarrier Output (Pin 12)
12
120 Ω
1.4 mA
IDC
10
U4468B
4777B–TVVCR–07/05
U4468B
8. Ordering Information
Extended Type Number
U4468B-MG
Package
Remarks
Standard Package Quantity
DIP16, Pb-free
Tube
1,400
9. Package Information
Package DIP16
Dimensions in mm
7.82
7.42
20.0 max
4.8 max
6.4 max
0.5 min 3.3
1.64
1.44
0.58
0.48
2.54
0.39 max
9.75
8.15
17.78
Alternative
16
9
technical drawings
according to DIN
specifications
1
8
11
4777B–TVVCR–07/05
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4777B–TVVCR–07/05
