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U4467B
TV Sound AM Demodulator
Description
The U4467B is an integrated bipolar circuit for AM sound demodulation used in the L- and L' standard (France). The IC provides the audio signal and mute switch as well. The U4467B is designed for TV-, VCR- and Multimedia applications.
Features
D Gain-controlled 3-stage wideband IF amplifier D Complete alignment-free AM demodulator
without external reference circuit
D AGC with a mean level detector D Mute switch D 5-V power supply, low power consumption
Block Diagram
VS
4
14
REF
IFAM
2 1
IF-Amp 6 AF(AM) AM-Det
3 AGC 13
Mean
10 Mute S2
13828
Figure 1.
Ordering Information
Extended Type Number U4467B Package DIP16 Remarks
Rev. A1, 23-Apr-99
1 (7)
Preliminary Information
U4467B
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 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 applied to the AM demodulator. The IF-AGC is derived from the average level of the AM sound. It controls the three-stage wideband amplifier to provide a constant SIF signal to the AM demodulator.
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 IF 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.
Mute Switch
The AM sound output (Pin 6) can be muted in pulling mute switch (Pin 10) to 'low'.
Internal Voltage Stabilizer
The internal bandgap reference voltage (4.25 V at Pin 4) ensures constant performance independent of supply voltage and temperature.
Pin Description
Vi,IF Vi,IF CAGC CREF NC Vo,AM NC NC 1 2 3 4 16 NC 15 NC 14 VS 13 GND Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol Vi,IF Vi,IF CAGC CREF NC Vo,AM NC NC NC Vsw,mute NC NC GND VS NC NC Function IF input (symmetrical) IF input (symmetrical) Capacitor for AGC time constant Capacitor for internal reference voltage Not connected AF output (AM sound) Not connected Not connected Not connected Mute switch Not connected Not connected Ground Supply voltage (5 V) Not connected Not connected
U4467B
5 6 7 8
13829
12 NC 11 NC 10 Vsw,mute 9 NC
Figure 2. Pinning
2 (7)
Rev. A1, 23-Apr-99
Preliminary Information
U4467B
Absolute Maximum Ratings
Reference point pin 13, unless otherwise specified Parameters Supply voltage range Pin 14 Supply current Pin 14 Power dissipation (VS = 9 V) Output current Pin 6 External voltages Pins 1, 2, 3, 4 and 6 Pin 10 Junction temperature Operating temperature range Storage temperature Electrostatic handling * all Pins * Symbol VS IS P Iout Vext Tj Tamb Tstg VESD Value 4.5 to 9.0 40 360 5 + 4.5 VS + 125 0 to + 85 -25 to +125 300 Unit V mA mW mA V V C C C V
"
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
Electrical Characteristics
Vs = +5 V, Tamb = +25C; reference point Pin 13, unless otherwise specified Parameters DC-supply Supply voltage Supply current IF-input Minimum IF input signal Maximum IF input signal Input impedance Input capacitance SIF-AGC IF gain control range AGC capacitor AM mute switch Switching voltage Switching voltage Switching current Test Conditions / Pins (Pin 14) Vin = 10 mV or V3 = 2 V (Pins 1 and 2) Output signal: -3 dB Output signal: + 1 dB See note 1 See note 1 (Pin 3) Symbol VS IS vin vin Rin Cin GV CAGC Min. 4.5 Typ. 5.0 26 50 100 1.2 2 65 4.7 Max. 9.0 Unit V mA
mVrms
mVrms kW pF dB
70
60
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(Pin 10) AM output active AM output switched off Vmute1 Vmute2 Imute open 0 1.5 -100
mF
V
mA
Note 1.
This parameter is given as an application information and not tested during production.
Rev. A1, 23-Apr-99
3 (7)
Preliminary Information
U4467B
Electrical Characteristics (continued)
Vs = + 5 V, Tamb = +25C; reference point Pin 13, unless otherwise specified Parameters AF output - AM DC output voltage Output resistance AF output signal AF bandwidth Total harmonic distortion Weighted signal-to-noise ratio (CCIR 468) Ripple rejection Test Conditions / Pins (Pin 6) Symbol Min. see note 2 VDC Rout voAF B THD S/N RR Typ. 2.2 Max. Unit
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see note 1 m = 54% -3 dB m = 54% fmod = 1 kHz, 12.5 kHz Reference: m = 54%; fmod = 1 kHz See note 1; tested from Pin 14 to Pin 6 150
W
V
500 tbd 1 56
2
mVrms kHz % dB dB
28
Allowable AC output peak current Allowable DC output current
IAC IDC
"0.3
-1
mA mA
Notes 1. 2.
This parameter is given as an application information and is not tested during production. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%: vin = 10 mV
Test Circuit
22 F NC 16 NC 15 14 13 VS +5 V S1 NC 12 NC 11 10 Mute NC 9
U4467B
Standard L IF 4.7 F 4.7 F AF (AM) 32.4 MHz Figure 3.
13830
1
2
3
4
5 NC
6
7 NC
8 NC
4 (7)
Rev. A1, 23-Apr-99
Preliminary Information
U4467B
Internal Pin Configuration
10 k
10 k 2.3 V
2 k 2
2 k
4 4.25 V 3.5 V
1
13795 13797
Figure 6. Internal reference voltage (Pin 4) Figure 4. Sound IF inputs (Pins 1 and 2)
1.45 V 6 100 1 mA
3
IDC Figure 7. AM output (Pin 6)
13799
13796
3.5 V Figure 5. AGC time constant (Pin 3) 10 20 k 20 k 2.6 V
13802
Figure 8. Mute switch (Pin 10)
Rev. A1, 23-Apr-99
5 (7)
Preliminary Information
U4467B
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
6 (7)
Rev. A1, 23-Apr-99
Preliminary Information
U4467B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC Semiconductor 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. TEMIC Semiconductor 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. TEMIC Semiconductor 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 TEMIC Semiconductors products for any unintended or unauthorized application, the buyer shall indemnify TEMIC Semiconductors 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. TEMIC Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2594, Fax number: 49 ( 0 ) 7131 67 2423
Rev. A1, 23-Apr-99
7 (7)
Preliminary Information

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