Features
•
Two Alignment-free PLL FM Demodulators, Automatic Lock-in on the Received Sound
Carrier Frequency
•
Mono and Dual Channel Application
•
Sound IF Inputs Provided for Ceramic Filters
•
Automatic Mute for Second Sound Channel (Squelch)
•
Mute Function for Both Sound Channels
•
5-V Supply Voltage, Low-power Consumption
•
Few External Components
•
Pb-free Package, which is Compliant with Requirements of RoHS
1. Description
The U2860B-M is a dual-channel FM sound demodulator realized with Atmel’s
advanced bipolar process. All TV FM standards, from 4.5 MHz 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 5V supply
voltage, the U2860B-M is suitable for TV, VCR and multimedia applications.
Figure 1-1. Block Diagram
Loop
filter 1
VCO 1
Mute
1
3
4
13 1112
Supply
8
7
C
stab
VCO
offset
10 VCO offset
Loop
filter 2
VCO 1
V
S
Squelch
Squelch (second carrier)
14
Squelch
V
in1
Mute
V
AF1
V
AF2
6
9
R
ref
(optional)
V
in2
Dual-channel
FM Sound
Demodulator for
TV Systems
U2860B-M
Rev. 4794E–TVVCR–12/05
2
4794E–TVVCR–12/05
U2860B-M
2. Pin Configuration
Figure 2-1. Pinning
VIN1
NC
VMUTE
VSQUE
NC
VAF2
VAF1
VIN2
VS
GND
CSTAB
RREF
C9
C8
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Table 2-1. Pin Description
Pin Symbol Function
1 VIN1 Intercarrier input of sound channel 1 (5.5 MHz)
2 NC Not connected
3 VMUTE Mute for sound channel 1 + 2 “on/off”
4 VSQUE Automatic mute for 2nd sound channel (squelch) “on/off”
5 NC Not connected
6 VAF2 Audio output AF2 of sound channel 2
7 VAF1 Audio output AF1 of sound channel 1
8 C8 Decoupling capacitor for sound channel 1
9 C9 Decoupling capacitor for sound channel 2
10 RREF VCO offset of the free-running frequency
11 CSTAB Internal supply voltage stabilization
12 GND Ground
13 VS Supply voltage
14 VIN2 Intercarrier input of sound channel 2 (5.74 MHz)
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4794E–TVVCR–12/05
U2860B-M
3. Circuit Description
The U2860B-M 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.
4. Limiter Amplifiers
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.
5. PLL FM Demodulators
The alignment-free Phase Locked Loop (PLL) demodulator covers a wide frequency range of
4.5 MHz up to 6.5 MHz with low-noise performance. The linear voltage to frequency characteris-
tic 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 a 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.
6. Audio Amplifiers
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.
7. Squelch Function
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 auto-
matic squelch function can be disabled by switching pin 4 to ground.
8. Mute Switch
Simultaneous muting of both circuits is possible by switching pin 3 to ground.
9. Internal Voltage Stabilizer
The internal bandgap reference ensures constant performance independent of supply voltage
and temperature.
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4794E–TVVCR–12/05
U2860B-M
10. 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 12, unless otherwise specified.
Parameters Pin Symbol Value Unit
Supply voltage 13 VS9.0 V
Supply current 13 IS33 mA
Power dissipation VS = +9 V P 300 mW
Output currents 6, 7 Iout ±1.5 mA
External voltages
1, 14
3, 4
6, 7, 8, 9, 10, 11
Vext
Vext
Vext
2.0
VS
4.5V
V
V
V
Junction temperature Tj+125 °C
Storage temperature Tstg –25 to +125 °C
Electrostatic handling(1) all pins VESD ±200 V
Note: 1. Machine model in accordance with ESD S5.2 standard.
11. Thermal Resistance
Parameters Symbol Value Unit
Junction ambient when soldering to PCB RthJA 90 K/W
12. Operating Range
Parameters Symbol Value Unit
Supply voltage range, pin 13 VS4.5 to 9.0 V
Ambient temperature Tamb 0 to 85 °C
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4794E–TVVCR–12/05
U2860B-M
13. Electrical Characteristics
VS = 5V, Tamb = 25°C, reference point pin , unless otherwise specified
Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit
DC Supply (Pin 13)
Supply voltage range VS4.5 5.0 9.0 V
Supply current IS27 33 mA
Intercarrier Input 1 (Pin 1)
DC input voltage VDC 1.75 V
Input resistance(1) Rin 680 750 Ω
Input limiting voltage
Input signal vin:
f = 5.5 MHz
output signal AF1:
vAF1 = –3 dB
vlim 150 µV
Intercarrier Input 2, Pin 14
DC input voltage VDC 1.75 V
Input resistance(1) Rin 680 750 Ω
Input limiting voltage
Input signal vin:
f = 5.74 MHz
output signal AF2:
vAF2 = –3 dB
vlim 150 µV
Input signal for automatic
second sound carrier mute off
(squelch)
Audio output AF2 active vin > 0.7 1.0 < 1.5 mV
FM Demodulators, Internal VCO’s (Pin 10)
Free-running frequency fVCO 5.5 MHz
Oscillator drift (free-running) as
function of temperature ∆T = 55°C ∆fVCO 500 kHz
Oscillator shift (free-running)
as function of supply voltage 4.5V < VS < 5.5V ∆fVCO 200 kHz
Adjustment range of
free-running frequencies
By external resistor Rref at
pin 10 ∆fadj ±1 MHz
Adjustment resistance for
free-running frequencies Rref 15 22 30 kΩ
FM Demodulators, Internal VCO’s (Pin 10)
Steepness of free-running
frequency adjustment Resistor Rref at pin 10 S 200 kHz/kΩ
Capture range of PLL’s ∆fcap ±1.4 ±1.9 MHz
Holding range of PLL’s ∆fhold ±2.0 ±3.0 MHz
Audio Outputs, AF1 (Pin 7) and AF2 (Pin 6)
DC output voltage VDC 2.2 V
DC output current IDC 1.0 –1.3 mA
Output resistance(1) Rout 150
AC output peak current iAC ±1.0 mA
Note: 1. This parameter is given as an application information and not measured during final testing.
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4794E–TVVCR–12/05
U2860B-M
AF output voltage, RMS value
vin = 10 mV
f = 5.5 MHz
FM-dev. = 27 kHz
fmod = 1 kHz
vAF 500 mV
Difference between the output
signals ∆vAF ±1 dB
Total harmonic distortion
vin = 10 mV
f = 5.5 MHz
FM-dev. = 27 kHz
fmod = 1 kHz
THD 0.1 0.5 %
AM suppression
vin = 10 mV
f = 5.5 MHz
fmod = 1 kHz
reference signal:
FM-dev. = 50 kHz
test signal: m = 30%
αAM 46 66 dB
Crosstalk attenuation between
the AF outputs f = 50 Hz to 12.5 kHz αatt 70 dB
Supply voltage ripple rejection VRR < 200 mV, f = 70 Hz RR 24 dB
Mute Switch (Pin 3)
Control voltage
- mute off
- mute on
AF outputs active
AF outputs not active
Vmute 2.0
0
VS
0.8
V
V
Control current Imute 150 µA
Squelch Function, (Pin 4)
Control voltage for
automatic mute 2nd carrier
- off
- on
Vsque 0
2.0
0.8
VS
V
V
Control current Isque 150 µA
13. Electrical Characteristics (Continued)
VS = 5V, Tamb = 25°C, reference point pin , unless otherwise specified
Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit
Note: 1. This parameter is given as an application information and not measured during final testing.
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4794E–TVVCR–12/05
U2860B-M
14. Diagrams
Figure 14-1. Total Harmonic Distortion
Figure 14-2. AM Suppression
Figure 14-3. VCO Free-running Frequency
0.0
0.1
0.2
0.3
0.4
0.5
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
Frequency (MHz)
THD (%)
-80
-70
-60
-50
-40
-30
-20
-10
0
30 40 50 60 70 80 90 100 110 120
IF Input Level (dBµV)
AM Suppression (dB)
0.0
40.0
80.0
120.0
2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
Frequency (MHz)
umin (µV)
R10 = 15k
R10 = 30k
Pin 10
open
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4794E–TVVCR–12/05
U2860B-M
Figure 14-4. Capture and Hold Range
Figure 14-5. Limiter Characteristics
Figure 14-6. Signal-to-noise Ratior
1.0
1.5
2.0
2.5
3.0
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
Frequency (MHz)
VCO Control Voltage U8 (V)
Input level = caption
Input level = hold
-18
-14
-10
-6
-2
2
26 28 30 32 34 36 38 40 42 44
IF Input Level (dB)
AF Output Level (dB)
f = 5.5 MHz, FM-dev. = +/- 50 kHz,
fmod = 1 kHz, 50 µs de-emphasis
-80
-75
-70
-65
-60
-55
-50
0246810
Frequency (MHz)
(S+N)/N (dB)
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4794E–TVVCR–12/05
U2860B-M
15. Drawings
Figure 15-1. SIF Inputs
Figure 15-2. Mute Switch/Squelch Switch
Figure 15-3. Audio Outputs
600Ω
1,14
600Ω
1.75V
2 kΩ
20 kΩ
3.5V
100Ω
1.0 mA
6,7
10
4794E–TVVCR–12/05
U2860B-M
Figure 15-4. Decoupling Capacitor
Figure 15-5. VCO Offset (Reference Resistor)
Figure 15-6. Internal Supply Voltage Stabilization
2.5 kΩ
8,9
22 kΩ
11.5 kΩ
3.5V
10
11
3.5V
11
4794E–TVVCR–12/05
U2860B-M
16. Test Circuit and Application Circuit
Figure 16-1. Test Circuit
Figure 16-2. Application Circuit
14 13 12 11 10 9 8
1234567
22 nF
22 mF
+5 V
50Ω
SIF 2
2.2 µF 2.2 µF10 µF
Mute Squelch
15 nF 15 nF
AF2 AF1
U2860B-M
C
stab
3.3 k Ω
3.3 k Ω
22 nF
50 Ω
SIF 1
22 nF
14 13 12 11 10 9 8
1234567
22 nF
22 µF
+5 V
680 Ω
680 Ω
SIF
SFE 5.5 MC
SFE 5.74 MC 2.2 kΩ
1 kΩ
2.2 µF 2.2 µF
10 µF
Mute Squelch
15 nF 15 nF
AF2 AF1
U2860B-M
3.3 kΩ3.3 kΩ
SFE 6.0 MC
12
4794E–TVVCR–12/05
U2860B-M
18. Package Information
17. Ordering Information
Extended Type Number Package Remarks Standard Package Quantitiy
U2860B-MFPG3G SO14, Pb-free Taped and reeled 4,000
U2860B-MFPY SO14, Pb-free Tube 3,100
technical drawings
according to DIN
specifications
Package SO14
Dimensions in mm
0.25
0.10
8.75
0.4
1.27
7.62
1.4
5.2
4.8
3.7
3.8
6.15
5.85
0.
2
14 8
17
Printed on recycled paper.
4794E–TVVCR–12/05
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