U2860B-A
TELEFUNKEN Semiconductors
Dual Channel FM Sound Demodulator for TV Systems Description The U2860B is a dual channel FM sound demodulator realized with TELEFUNKEN‘s advanced bipolar process. All TV FM standards, from 4.5 up to 6.5 MHz (standard M, B/G, I, D/K), can be processed with high
performance. The circuit is alignment-free and has a minimum number of external components. With 5 V supply voltage the U2860B is suitable for TV, VCR and Multimedia applications.
Features Two alignment-free PLL FM demodulators, automatic lock in on the received sound carrier frequency
Mute function for both sound channels
Mono and dual channel application
Few external components
5 V supply voltage, low power consumption
Sound IF inputs provided for ceramic filters Automatic mute for 2nd sound channel (squelch)
Package: 14 pin dual-inline plastic (DIP14)
VS Cstab 13
12
8
11
Supply
Vin1
1
Mute
3
7
VCO 1
Mute
VAF1
Loop filter 1
10
VCO offset
VCO offset Rref (optional)
Vin2
14
VCO 1
Loop filter 2 6
VAF2
Squelch 4 Squelch Squelch (second carrier)
9
94 8139 e
Figure 1. Block diagram
Rev. A1: 23.08.1995
Preliminary Information
1 ((11)
U2860B-A
TELEFUNKEN Semiconductors
Circuit Description
Audio Amplifiers
The U2860B includes two identical sound IF channels. Each consists of a limiter amplifier, PLL FM demodulator and AF amplifier. Additionally this circuit contains a squelch function, mute switch and internal voltage regulation.
The demodulated signals are amplified to 500 mVrms with low output impedance at the audio outputs (Pin 6 and Pin 7). AC decoupling at Pin 8 and Pin 9 of the audio amplifiers leads to high common mode rejection.
Limiter Amplifiers
Squelch Function
The intercarrier signals are fed through external ceramic bandpass filters to a 7 stage limiter amplifier. This guarantees high input sensitivity and excellent AM suppression.
For channel 2 the audio output amplifier and VCO2 is muted automatically (squelch) when the second sound carrier is not present. This avoids a wrong identification for stereo and dual sound in the stereo decoder. Therefore, with mono sound, there is no output signal at Pin 6. The automatic squelch function can be disabled by switching Pin 4 to ground.
PLL FM demodulators The alignment-free ”Phase Locked Loop” (PLL) demodulator cover a wide frequency range of 4.5 MHz up to 6.5 MHz with low noise performance. The linear voltage to frequency characteristic results in low harmonic distortion. The free running frequency of the internal VCO circuit is about 5.5 MHz. For this frequency the input sensitivity and VCO locking is optimal. An additional external resistor at pin 10 allows frequency shift of ±1 MHz via an internal offset current. With this option it is possible to shift the optimum conditions to the upper frequency (6.5 MHz) or to the lower frequency (4.5 MHz). The offset current acts simultaneously on both VCO circuits. If no resistor is connected the offset current is disabled.
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Mute Switch Simultaneously muting of both circuits is possible with switching Pin 3 to ground.
Internal Voltage Stabilizer The internal bandgap reference ensures constant performance independent of supply voltage and temperature.
Preliminary Information
Rev. A1: 23.08.1995
U2860B-A
TELEFUNKEN Semiconductors
Pin Description Vin1
n.c.
Vmute
Vsque
n.c.
14
1
13
2
3
12
U2860B
4
11
10
5
Vin2
Pin 1
Symbol Vin1
2 3
n.c Vmute
4
Vsque
5 6
n.c. VAF2
7
VAF1
8
C8
9
C9
10
Rref
11
Cstab
12 13 14
GND VS Vin2
VS
GND
Cstab
Rref
VAF2
6
9
C9
VAF1
7
8
C8
Function Intercarrier input of sound channel 1 (5.5 MHz) Not connected Mute for sound channel 1+2 ”on/off” Automatic mute for 2nd sound channel (squelch) ”on/off” Not connected Audio output AF2 of sound channel 2 Audio output AF1 of sound channel 1 Decoupling capacitor for sound channel 1 Decoupling capacitor for sound channel 2 VCO offset of the free running frequency Internal supply voltage stabilization Ground Supply voltage Intercarrier input of sound channel 2 (5.74 MHz)
94 8679
Figure 2. Connection diagram
Absolute Maximum Ratings Reference point Pin 12, unless otherwise specified. Parameters Supply voltage Supply current Power dissipation Output currents External voltages
Pin 13 Pin 13 VS = +9 V Pin 6, 7 Pin 1, 14 Pin 3, 4 Pin 6, 7, 8, 9, 10, 11
Junction temperature Storage temperature Electrostatic handling *) all pins *)
Symbol VS IS P Iout Vext Vext Vext Tj Tstg VESD
Value 9.0 33 300 ±1.5 2.0 VS 4.5 V +125 –25 to +125 ±200
Unit V mA mW mA V V V °C °C V
Machine model in accordance with ESD S5.2 standard
Rev. A1: 23.08.1995
Preliminary Information
3 ((11)
U2860B-A
TELEFUNKEN Semiconductors
Operating Range Parameters Supply voltage range Ambient temperature
Pin 13
Symbol VS Tamb
Value 4.5 to 9.0 0 to +85
Unit V °C
Symbol RthJA
Value 90
Unit K/W
Thermal Resistance Parameters Junction-ambient when soldered to PCB
Electrical Characteristics VS = 5 V, Tamb = 25_C, reference point pin 12, unless otherwise specified Parameters DC-supply Supply voltage range Supply current Intercarrier input 1 DC input voltage Input resistance Input limiting voltage
Intercarrier input 2 DC input voltage Input resistance Input limiting voltage
Test Conditions / Pins Pin 13
Min.
Typ.
Max.
Unit
VS IS
4.5
5.0 27
9.0 33
V mA
750 150
V V
750 150
V V
< 1.5
mV
Pin 1 see note 1 input signal vin: f = 5.5 MHz output signal AF1: vAF1 ⇒ –3 dB Pin 14 see note 1 input signal vin: f = 5.74 MHz output signal AF2: vAF2 ⇒ –3 dB audio output AF2 active
Input signal for automatic second sound carrier ”mute off” (squelch) FM demodulators, internal VCO’s Pin 10 Free-running frequency Oscillator drift (free run∆T = 55°C ning) as function of temperature Oscillator shift (free run4.5 V < VS < 5.5 V ning) as function of supply voltage Adjustment range of free by external resistor Rref at running frequencies Pin 10 Adjustment resistance for free running frequencies
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Symbol
VDC Rin vlim
1.75 680
VDC Rin vlim
1.75 680
vin
> 0.7
1.0
fVCO ∆fVCO
5.5 500
MHz kHz
∆fVCO
200
kHz
∆fadj
±1
Rref
15
Preliminary Information
MHz 22
30
k
Rev. A1: 23.08.1995
U2860B-A
TELEFUNKEN Semiconductors Parameters Test Conditions / Pins FM demodulators, internal VCO’s Pin 10 Steppness of free running resistor Rref at Pin 10 frequency adjustment Capture range of PLL’s Holding range of PLL’s Audio outputs, AF1 (Pin 7) and AF2 (Pin 6) DC output voltage DC output current Output resistance see note 1 AC output peak current AF output voltage, RMS vin = 10 mV, value f = 5.5 MHz, FM-dev. = 50 kHz, fmod = 1 kHz Difference between the output signals Total harmonic distortion vin = 10 mV, f = 5.5 MHz, FM-dev. = 50 kHz, fmod = 1 kHz AM suppression vin = 10 mV, f = 5.5 MHz, fmod = 1 kHz, reference signal: FM-dev. = 50 kHz test signal: m = 30% Crosstalk attenuation f = 50 Hz to 12.5 kHz between the AF outputs Supply voltage ripple rejec- VRR < 200 mV, f = 70 Hz tion Mute switch Pin 3 Control voltage - muteoff AF outputs active - mute on AF outputs not active Control current Squelch function Pin 4 Control voltage for automatic mute-2nd carrier ”off” automatic mute-2nd carrier ”on” Control current
Symbol
Min.
S ∆fcap ∆fhold
±1.4 ±2.0
VDC IDC Rout iAC vAF
Typ.
kHz/kW
±1.9 ±3.0
MHz MHz
2.2 –1.8 150
–2.0 ±1.5
500
THD
0.1
V mA W mA mV
±1
dB
0.5
%
66
dB
aatt
70
dB
RR
24
dB
Vmute
46
Unit
200
∆vAF
aAM
Max.
2.0 0
Imute
Vsque
VS 0.8
V V mA
0.8 VS
V V
150
0 2.0
Isque
150
mA
Notes 1.
This parameter is given as an application information and not measured during final testing.
Rev. A1: 23.08.1995
Preliminary Information
5 ((11)
U2860B-A
TELEFUNKEN Semiconductors +5 V
94 8140
22 F 22 nF
Cstab
SIF 2
*)
10 F
22 nF
2.2 F
2.2 F
50 14
13
12
11
10
9
8
6
7
U2860B 1
2
4
3
22 nF
5 3.3 k
SIF 1 50
3.3 k
15 nF
15 nF Mute
Squelch
AF 2
AF 1
Figure 3. Test circuit
+5 V
94 8498
22 F
2.2 k
SFE 5.74 MC
*)
1 k
10 F 2.2 F
22 nF 680
14
13
12
11
2.2 F
10
9
8
5
6
7
U2860B
SIF
680
1
2
3
4
SFE 5.5 MC
SFE 6.0 MC Mute
3.3 k
3.3 k
15 nF
15 nF
Squelch
AF 2
AF 1
Figure 4. Application circuit
6 (11)
Preliminary Information
Rev. A1: 23.08.1995
U2860B-A
TELEFUNKEN Semiconductors
95 10708
Figure 5. PCB layout (test/application circuit)
95 10709
Figure 6. Component layout (test circuit)
Rev. A1: 23.08.1995
95 10710
Figure 7. Component layout (application circuit)
Preliminary Information
7 ((11)
U2860B-A
TELEFUNKEN Semiconductors
3.0
0.5 VCO control voltage (U8)/ V
input level = 0.4
THD/ %
0.3 0.2 0.1 0
caption
hold
2.5
2.0
1.5
1.0 1
2
3
4
5
6
7
8
Frequency/ MHz
95 10705
1
9
2
3
4
5
6
7
8
9
Frequency/ MHz
95 10702
Figure 8. Figure 9 AM suppression
Figure 11. Capture and hold range
0
2
–10 –2 AF output level/ dB
AM suppression/ dB
–20 –30 –40 –50 –60
–6 –10 –14 f = 5.5 MHz, FM-dev = +/–50 kHz, fmod = 1 kHz, 50 s-deemphasis
–70 –80
–18 30
40
50
60
70
80
90 100 110 120
IF input level/ dBV
95 10703
26
120.0
–50
100.0
–55
80.0 60.0 40.0
0.0 2.0 95 10707
Pin 10 open R 10 = 15 K R 10 = 30 K 3.0
4.0
32
34
36
38
40
42
44
IF input level/ dBV
–60 –65 –70 –75
5.0
6.0
7.0
8.0
Frequency/ MHz
Figure 10. Total harmonic distortion
8 (11)
30
Figure 12. Limiter characteristics
(S+N)/ N [dB]
umin/ V
Figure 9. VCO free running frequency
20.0
28
95 10704
9.0
–80 2.0
4.0
6.0
8.0
Frequency/ MHz
95 10706
Figure 13. Signal to noise ratio
Preliminary Information
Rev. A1: 23.08.1995
U2860B-A
TELEFUNKEN Semiconductors
8,9 600
1,14
1.75 V
600
94 8587
5k
94 8590
Figure 17. Decoupling capacitor
Figure 14. SIF inputs
3.5 V 3.5 V 11.5 k 20 k
10
2 k
3,4
22 k 94 8588 94 8591
Figure 15. Mute switch/squelch switch
Figure 18. VCO offset (reference resistor)
11 6,7 100
3.5 V
94 8592
1.8 mA 94 8589
Figure 16. Audio outputs
Rev. A1: 23.08.1995
Figure 19. Internal supply voltage stabilization
Preliminary Information
9 ((11)
U2860B-A
TELEFUNKEN Semiconductors
Dimensions in mm
94 9445
Figure 20. 14 pin dual-inline-plastic (DIP 14)
10 (11)
Preliminary Information
Rev. A1: 23.08.1995
TELEFUNKEN Semiconductors
U2860B-A
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
Rev. A1: 23.08.1995
Preliminary Information
11 ((11)
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