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U2861B
Mono FM Sound Demodulator for TV Systems
Description
The U2861B is an alignment-free FM sound IF demodulator for all TV standards from 4.5 MHz up to 6.5 MHz (standard M, N, B/G, I, D/K). The circuit includes two switchable audio inputs and volume control. With a supply voltage of 5 V, the U2861B is suitable for TV, VCR and Multimedia applications.
Features
D Completely alignment-free D PLL demodulator for FM intercarrier sound IF signals
(mono)
D Very few external components D Volume control by DC voltage D Supply voltage: 5 V; low power consumption
D Two audio switches
AF1in
AF1out
AF2in
VS
vi,AF1
vo,AF1
vi,AF2
Cref
VS
1 VCO
12
10
6 Bandgap reference
7
Sound IF input vi,SIF
Switch1 3 5 kW
Switch2 8 vo,AF2 AF2out
4
GND
2
Cdec
5
Vmute
14
Cdem
13
VSW1
11
VSW2
9
Vvol
Decoupling
FM mute
Deemphasis
Audio switch1
Audio switch2
Volume control
96 11832
Figure 1. Block diagram
Ordering Information
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taped on reel TELEFUNKEN Semiconductors Rev. A1, 20-May-97 1 (11)
Extended Type Number U2861B - M U2861B - MFPG3
Package DIP14 SO14
Remarks
Preliminary Information
U2861B
Circuit Description
Sound IF Limiter Amplifier
The intercarrier signal coming from the sound filter is fed to a 7-stage limiter amplifier. This guarantees high input sensitivity and excellent AM suppression.
Audio Switch 1
The first audio switch (Pin 13) has inputs for the demodulated FM signal and the external AF1 signal from Pin 1. For multistandard purposes, it is possible to handle internal FM and external AM audio signals. The output of switch1 is also permanently available at Pin 12 (e. g. for SCART interface).
PLL - FM Demodulator
The alignment-free "Phase-Locked-Loop" (PLL) FM demodulator covers a wide frequency range of 4.5 MHz up to 6.5 MHz with excellent noise performance. Due to the fact that the voltage-to-frequency characteristic is linear, a low harmonic distortion can be achieved. The free-running frequency of the internal VCO circuit is about 5.5 MHz. The demodulated FM signal is led via de-emphasis and buffered to Pin 12. The de-emphasis low pass filter consists of an internal 5-kW series resistor and an external capacitor at Pin 14. The FM muting is possible by switching Pin 5 to ground.
Audio Switch 2 and Volume Control
The second audio switch (Pin 11) has inputs for the audio signal from switch 1 and the external AF2 signal at Pin 10. The switched AF signal is fed to volume control. The output voltage can be controlled by a DC voltage at Pin 9.
Internal Voltage Stabilizer
The internal bandgap reference ensures constant performance independent of supply voltage and temperature.
Pin Description
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11 12 13 14 Vsw2 vo,AF1 Vsw1 Cdem 2 (11)
Pin 1 2 3 4 5 6 7 8 9 10
Symbol vi,AF1 Cdec vi,SIF GND Vmute Cref Vs vo,AF2 Vvol vi,AF2
Function Audio input 1 (e.g. AM signal) Decoupling capacitor FM sound IF input Ground FM mute switch Internal reference voltage Supply voltage Switched audio output 2 Volume control Audio input 2 (e.g. from SCART) Audio switch 2 Switched audio output 1 Audio switch 1 De-emphasis and mute switch
vi,AF1 1 Cdec 2
14 Cdem 13 VSW1 12 vo,AF1
vi,SIF 3 GND 4 Vmute 5 Cref 6 VS 7
96 11833
U2861B
11 VSW2 10 vi,AF2 9 8 Vvol vo,AF2
Figure 2. Pinning
Preliminary Information
TELEFUNKEN Semiconductors Rev. A1, 20-May-97
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Thermal Resistance
*) equivalent to discharge a 200-pF capacitor through a 0-W resistor Parameters Junction ambient when soldered to PCB DIP14 package SO14 package Symbol RthJA Value 90 140 K/W K/W Unit
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Reference point Pin 4, unless otherwise specified
TELEFUNKEN Semiconductors Rev. A1, 20-May-97 Ambient temperature Junction temperature Storage temperature Electrostatic handling *) all pins Output currents External voltages g Supply voltage DIP14 package SO14 package Supply current Power dissipation Parameters Pin 7
Absolute Maximum Values
Pin 7 Vs = 9 V (DIP14 only) Vs = 6 V Pin 8, 12 Pin 1, 2, 3, 5, 6, 8, 9, 10, 12, 13, 14 ,,,,,,, , , , Pin 11
Preliminary Information
Symbol Tamb Tj Tstg VESD Vext t Iout Vs Is P 9.0 6.0 25 225 150 1.0 + 4.5 + 12.0 -10 to +85 +125 -25 to +125 +/- 200 V Value
U2861B
Unit
V V mA mW mW mA V V C C C V
3 (11)
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Vs = +5 V, Tamb = +25C; reference point Pin 4, unless otherwise specified
Electrical Characteristic
U2861B
4 (11)
Supply voltage ripple rejection
AM suppression
Total harmonic distortion
DC input voltage Input resistance Input capacitance FM - PLL: Free-running frequency Oscillator drift (free running) as function of temperature Oscillator shift (free running) as function of supply voltage Capture range of PLL Holding range of PLL Decoupling capacitor: (Pin 2) Value of decoupling capacitor De-emphasis capacitor: (Pin 14) Value of de-emphasis capacitor Audio output 2: (Pin 8) DC output voltage Output resistance AC output peak current DC output current AF output voltage, RMS value
Parameters DC supply: (Pin 7) Supply voltage DIP14 package SO14 package Supply current FM sound IF input: (Pin 3) Input limiting voltage, RMS value
Preliminary Information
Symbol VDC Rout iAC IDC vo,AF2
Dfcap Dfhold
Dfvco
Dfvco
vi,SIF
THD
Cdem
VDC Rin Cin
Cdec
aAM
fvco
RR
Vs
Is
vin = 10 mV, f = 5.5 MHz, FM-dev. = 27 kHz, fmod = 1 kHz vin =10 mV, f = 5.5 MHz, FM-dev. = 27 kHz, fmod = 1 kHz vin =10 mV, f = 5.5 MHz, fmod =1 kHz, reference signal: FM-dev. = 27 kHz test signal: m = 30% VRR < 200 mV, f = 70 Hz
AF output signal at pin 8 and pin12: -3 dB
4.5 V < Vs < VS,max
Test Condition
DT = 55C
See note 1 See note 1
t = 50s
TELEFUNKEN Semiconductors Rev. A1, 20-May-97 Min. 1.4 2.0 4.5 4.5 42 1.9 2.5 Typ. 500 2.2 130 200 5.5 500 1.7 600 1.5 0.1 2.2 5.0 5.0 20 30 60 10 Max. 1.0 -1.2 750 150 0.5 9.0 6.0 25 mA mA mVRMS VRMS MHz MHz MHz kHz Unit kHz V V mA dB dB F nF pF %
W
W
V V
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Vs = +5 V, Tamb = +25C; reference point Pin 4, unless otherwise specified
TELEFUNKEN Semiconductors Rev. A1, 20-May-97
10. Without control voltage at Pin 5, the mute function is not active.
9. Without control voltage at Pin 11, the audio signal from switch1 is automatically selected.. With V11 < 1.5 or V11 > 4.0 V input Pin 10 is selected.
8. Without control voltage at Pin 13, the internal FM demodulated
7. This parameter is given as an application information and is not tested during production.
Notes:
Electrical Characteristics
Parameters Symbol Audio input 1: (Pin 1) Input resistance Rin Internal DC bias voltage VDC AF1 input signal vi,AF1 Mode selection audio switch 1: (Pin 13) Control voltage for: Vsw1 FM demodulated signal External signal AF1 Switching current Isw1 Audio input 2: (Pin 10) Input resistance Rin Internal DC bias voltage VDC AF2 input signal vi,AF2 Audio output 1: (Pin 12) DC output voltage VDC AF output voltage vo,AF Output resistance Rout Mode selection audio switch 2: (Pin 11) Control voltage for: External signal AF2 Vsw Signal from switch1 Signal from switch1 Switching current Isw Volume control: (Pin 9) AF control range DAF Control voltage: minimal volume Vvol maximal volume Mute switch: (Pin 5) Control voltage for "mute off" Vmute Control voltage for "mute on" Vmute
Preliminary Information
Test Condition See note 3 See note 2 AF "on" AF "off" Min. 2.1 0 2.0 0 0 4.0 0 Typ. 2.3 500 130 2.9 2.8 50 3.0 50 3.0 80 4
U2861B
Max.
1.5 12.0 60
900
900
4.5 1.5
4.5
4.5 0.8 70
V mVRMS
kW V mVRMS
kW V mVRMS
Unit
mA
mA
dB V V
5 (11)
W
V V V V V V V
U2861B
AF1out Switch1
AF2in Switch2
Volume control
AF2out
10 nF 14 13
1 F 12 11
1 F 10 9
1 F 8
U2861B
1 2 3 10 nF 1 F 2.2 F 1 F 22 F FM mute switch VS
96 11834
4
5
6
7 22 nF
50 SIF (intercarrier)
AF1in
Figure 3. Test circuit
6 (11)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A1, 20-May-97
U2861B
AF1out Switch1
AF2in Switch2 Volume control
AF2out
10 nF 14 13
1 F 12 11
1 F 10 9
1 F 8
U2861B
1 2 3 4 5 2.2 F 22 nF 680 SIF (intercarrier) 22 F FM mute switch 6 7
1 F AF1in
2.2 F
SFE 5.5 MC
+5V
96 11835
Figure 4. Basic application circuit
TELEFUNKEN Semiconductors Rev. A1, 20-May-97
7 (11)
Preliminary Information
U2861B
Internal Pin Configuration
6 50 kW 1
96 11836 96 11839
3.5 V
Figure 5. Audio input 1 (Pin 1)
Figure 8. Internal reference voltage (Pin 6)
25 kW 2 8
100
W
1.0 mA
2.5 kW
2.5 kW
96 11840 96 11837
Figure 6. Decoupling capacitor (Pin 2)
Figure 9. Audio output 2 (Pin 8)
3
600
W W
1.75 V
9
2.8 V
600
96 11838
96 11841
Figure 7. FM sound IF input (Pin 3)
Figure 10. Volume control (Pin 9)
8 (11)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A1, 20-May-97
U2861B
Internal Pin Configuration (continued)
3.5 V 40 kW
50 k W 10
96 11845 96 11842
13
25 kW
2.4 V
Figure 11. Audio input 2 (Pin 10)
Figure 14. Switch 1 (Pin 13)
2.8 V
50 kW 14 5kW
11
13 kW
2.1 V
96 11843
96 11846
Figure 12. Audio switch 2 (Pin 11)
Figure 15. De-emphasis (Pin 14)
3.5 V 12
100 W
5 kW 5 5 kW 2.3 V
25 kW
1.2 mA
96 11844 12704
Figure 13. Audio output 2 (Pin 12)
Figure 16. Mute switch (Pin 5)
TELEFUNKEN Semiconductors Rev. A1, 20-May-97
9 (11)
Preliminary Information
U2861B
Package Information
Package DIP14
Dimensions in mm
20.0 max 7.77 7.47
4.8 max 6.4 max 0.5 min 3.3 0.36 max 1.64 1.44 0.58 0.48 15.24 14 8 2.54 9.8 8.2
technical drawings according to DIN specifications 13020
1
7
Package SO14
Dimensions in mm
8.75
5.2 4.8 3.7
1.4 0.4 1.27 7.62 14 8 0.25 0.10 0.2 3.8 6.15 5.85
technical drawings according to DIN specifications 13035
1
7
10 (11)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A1, 20-May-97
U2861B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic 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 TELEFUNKEN microelectronic GmbH semiconductor division 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 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 products for any unintended or unauthorized application, the buyer shall indemnify TEMIC 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 TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
TELEFUNKEN Semiconductors Rev. A1, 20-May-97
11 (11)
Preliminary Information

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