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U4468B
Quasi-Split Sound Circuit and AM Demodulator
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.
Features
D 5-V supply voltage; low power consumption D Gain-controlled 3-stage wideband IF amplifier D Active carrier generation by FPLL principle (frequency-phase-locked-loop) for true quadrature demodulation D Complete alignment-free AM demodulator D Switchable amplitude detector for gain control, which operates as a peak detector for FM sound and as a mean level detector for AM sound
Block Diagram
VS 4 IFFM 2 1 IFAM IF-Amp 12 Intercarrier (FM) 14 REF FPLL Loop filter 5 0 VCO 90 8 9 VCO
Mean 3 AGC Peak level 13 IF AGC Mean/peak 7 S1 Mute AM-Det 10 S2
13771
6 AF(AM)
Figure 1. Block diagram
Ordering Information
Extended Type Number U4468B Package DIP16 Remarks
Rev. A2, 08-Mar-01
1 (9)
U4468B
Circuit Description
IF Amplifier and AGC
The symmetrical IF input signal from the external SAW filter is fed to the Pins 1 and 2. For FM/NICAM application, a SAW filter with double bandpass characteristic is required for the vision and sound carrier. In case of L-standard, a bandpass filter with the center frequency at the L-sound carrier is used. The amplifier consists of three AC-coupled wideband 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 wideband amplifier to provide a constant SIF signal to the AM demodulator or to the QSS (quasi-split sound) mixer.
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, capture and hold range are centered.
AM Demodulator
The alignment-free AM demodulator is realized by a synchronous detector. The modulated IF signal from the wideband 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.
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 is a peak value detector.
Quasi-Split-Sound (QSS) Mixer
The QSS mixer is realized by a multiplier circuit. The IF signal (FM/NICAM) is converted in 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.
Internal Voltage Stabilizer
The internal bandgap reference voltage (4.25 V at Pin 4) ensures constant performance independent of supply voltage and temperature.
Mute Switch
AM sound output (Pin 6) can be muted in pulling mute switch (Pin 10) to `low'.
2 (9)
Rev. A2, 08-Mar-01
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*) Equivalent to discharging a 200-pF capacitor through a 0-W resistor Reference point Pin 13, unless otherwise specified
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Pin Description
13 14 11, 15, 16 Pin 1, 2 3 5 6 7 8,9 10 12 4 Function IF input (symmetrical) Capacitor for AGC time constant CREF Capacitor for internal reference voltage LF Loop filter Vo,AM AF output (AM sound) Vsw,AGC Standard switch VVCOAAAAAAAAAA VCO circuit Vsw,mute Mute switch Vo,FM Intercarrier output (FM sound) GND Ground VS Supply voltage (5 V) NC Not connected Symbol Vi,IF CAGC
Rev. A2, 08-Mar-01
Thermal Resistance
Absolute Maximum Ratings
Parameters Junction ambient when soldered to PCB
Parameters Supply voltage range Pin 14 Supply current Pin 14 Power dissipation (VS = 9 V) Output currents Pin 6 and 12 External voltages Pins 1, 2, 3, 4, 6 and 12 Pins 5, 8, 9 Pins 7, 10 Junction temperature Operating temperature range Storage temperature Electrostatic handling *) all Pins
Symbol RthJA
Symbol Vs Is P Iout
Tj Tamb Tstg VESD
Vext
Vsw,AGC
Vo,AM
VVCO
CAGC
CREF
Vi,IF
Vi,IF
LF
8
7
6
5
4
3
2
1
Figure 2. Pinning
Value 4.5 to 9.0 55 500 5 + 4.5 + 3.5 Vs +125 0 to +85 -25 to +125 " 300
U4468B
Value 60
U4468B
10 Vsw,mute
11 NC
12 Vo,FM
13 GND
14 VS
15 NC
16 NC
9 VVCO
Unit K/W
Unit V mA mW mA V V V C C C V
13794
3 (9)
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1. This parameter is given as an application information and is not tested during production. Notes VS = + 5 V, Tamb = + 25C; reference point Pin 13, unless otherwise specified
3. Without external control voltage (Pin 7 open), the IC automatically operates in mode 1.
2. The oscillator drift is related to the picture carrier frequency, with external temperature-compensated LC circuit
Electrical Characteristics
U4468B
4 (9) Switching current Switching voltage Switching voltage AM mute switch Switching current Switching voltage for mode 2: Average level control AM sound Switching voltage for mode 1: Peak value control FM/NICAM sound (see note 3) Standard switch Oscillator drift (free running) as function of temperature Vision carrier capture range Max. oscillator frequency FPLL and VCO AGC capacitor IF gain control range SIF-AGC Input capacitance Input impedance Maximum IF input signal Minimum IF input signal IF-input Supply current Supply voltage DC-supply Parameters (Pin 3) (Pins 1, 2) (Pin 14) (Pins 5, 8, and 9) (Pin 10) (Pin 7) AM output switched off AM output active DTamb = 55C, fvco = 38.9 MHz Cvco = 6.2 pF, (see note 2) fvco = 38.9 MHz Cvco = 6.2 pF for carrier generation (See note 1) (See note 1) Output signal: +1 dB Output signal: -3 dB vin=10 mV or V3 = 2 V Test Conditions / Pins Symbol
Df/DT
Vmute2
Vmute1
Dfcap
CAGC
Vsw2
Vsw1
fVCO
Imute
Cin
Rin
Isw
Gv
vin
vin
Vs
Is
" 1.5
Min.
2.0
4.5
70
60
70
0
0
"100
"2
-100
open
Typ.
100
4.7
1.2
5.0
65
50
40
2
Rev. A2, 08-Mar-01 Max. -0.3 1.5 1.5 9.0 Vs mVrms Vrms MHz MHz Unit
mA mA
mA kW dB F pF % V V V V
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Notes VS = + 5 V, Tamb = + 25C; reference point Pin 13, unless otherwise specified
Rev. A2, 08-Mar-01 5. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; vin = 10 mV 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) 3. Without external control voltage (Pin 7 open), the IC automatically operates in mode 1. 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 external temperature-compensated LC circuit
Electrical Characteristics (continued)
Allowable AC output peak current Allowable DC output current AF output - AM (Pin 6) DC output voltage Output resistance (See note 1) AF output signal m = 54% AF bandwidth -3dB Total harmonic distortion m = 54% fmod = 1 kHz, 12.5 kHz Weighted signal-to-noise ratio Reference: m = 54%; (CCIR 468) fmod = 1 kHz Ripple rejection Tested from Pin 14 to 6 (see note 1) Allowable AC output peak current Allowable DC output current
Ripple rejection
Weighted signal-to-noise ratio (CCIR 468)
Intercarrier bandwidth
Parameters Intercarrier output DC output voltage Output resistance Intercarrier output signal
Test Conditions / Pins (Pin 12) see note 4
(See note 1) vin = 10 mV 5.5 MHz output signal -1 dB -3 dB B/G mod. VIF signal: vin=10 mV; FM dev. = 27 kHz; fmod = 1 kHz; tested with U2860B; Black screen: Channel 1/2 Color bar: Channel 1/2 Tested from Pin 14 to 12 (see note 1)
Symbol
VDC Rout voAF B THD
VDC Rout Vout
S/N
IDC
IAC
IDC
IAC
RR
RR
B
Min.
100
28
35
60/58 58/56
Typ.
500 tbd 1
150
tbd tbd
2.2
56
2
U4468B
"0.3
"0.7
Max.
150
200
-1
-2
2
V W mVrms kHz %
V W mVrms
MHz MHz
Unit
mA
mA
mA
mA
dB
dB
dB dB dB
5 (9)
U4468B
Test Circuit
VS +5 V
22 F 270 500
Rx
SFT 5.74 MA
10 nF 10 F
2.2 F 2.2 F 10 9 8
14 680
13
12
11
U2860B
680 1 2 3 4 5 6 7 3.3 k 15 nF
SFT 5.5MA
3.3 k 15 nF
Intercarrier frequency
Mute Squelch VS +5 V
AF2
AF1
22 F
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 p F
IF
33.4 MHz
38.9 MHz
4.7 F 4.7 F 470 nF Standard L
32.4 MHz
13772
Figure 3.
6 (9)
Rev. A2, 08-Mar-01
U4468B
Internal Pin Configuration
10 k 10 k 2.3 V 2 k 2 1 2.75 V 2 k 5
13795
13798
Figure 4. Sound IF inputs (Pins 1 and 2)
Figure 7. Loop filter (Pin 5)
1.45 V 6 100 1 mA 3
IDC Figure 8. AM output (Pin 6)
13799
13796
3.5 V 17 k 7 Figure 5. AGC time constant (Pin 3) 23 k
13800
15.5 k
Figure 9. AGC switch (Pin 7)
4 4.25 V 3.5 V 8 3 k 3 k 9
13797 13801
Figure 6. Internal reference voltage (Pin 4)
Figure 10. VCO (Pins 8 and 9)
Rev. A2, 08-Mar-01
7 (9)
U4468B
Internal Pin Configuration
3.5 V 20 k 10 20 k 2.6 V
13802
12
120
1.4 mA Figure 11. Mute switch (Pin 10) IDC
13803
Figure 12. Intercarrier output (Pin 12)
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 0.39 max 9.75 8.15
2.54
9
technical drawings according to DIN specifications
1
8
13015
8 (9)
Rev. A2, 08-Mar-01
U4468B
Ozone Depleting Substances Policy Statement
It is the policy of Atmel Germany GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
Rev. A2, 08-Mar-01
9 (9)

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