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
Dual-channel
FM Sound
Demodulator for
TV Systems
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.
U2860B-M
Block Diagram
VS
Cstab
13
12
8
11
Supply
Vin1
Mute
1
3
7
VCO 1
Mute
VAF1
Loop
filter 1
10
VCO
offset
VCO offset
Rref
(optional)
Vin2
Squelch
14
VCO 1
Loop
filter 2
6
4
VAF2
Squelch
Squelch (second carrier)
9
Rev. 4794E–TVVCR–12/05
2. Pin Configuration
Figure 2-1.
Pinning
VIN1
NC
VMUTE
VSQUE
NC
VAF2
VAF1
Table 2-1.
2
1
2
3
4
5
6
7
14
13
12
11
10
9
8
VIN2
VS
GND
CSTAB
RREF
C9
C8
Pin Description
Pin
Symbol
1
VIN1
Function
2
NC
3
VMUTE
Mute for sound channel 1 + 2 “on/off”
4
VSQUE
Automatic mute for 2nd sound channel (squelch) “on/off”
5
NC
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
13
VS
14
VIN2
Intercarrier input of sound channel 1 (5.5 MHz)
Not connected
Not connected
Ground
Supply voltage
Intercarrier input of sound channel 2 (5.74 MHz)
U2860B-M
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 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 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 automatic 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.
3
4794E–TVVCR–12/05
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
Supply voltage
13
VS
9.0
V
IS
33
mA
P
300
mW
6, 7
Iout
±1.5
mA
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
±200
V
Symbol
Value
Unit
RthJA
90
K/W
Symbol
Value
Unit
VS
4.5 to 9.0
V
Tamb
0 to 85
°C
Supply current
13
Power dissipation VS = +9 V
Output currents
External voltages
VESD
Electrostatic handling(1) all pins
Note:
1. Machine model in accordance with ESD S5.2 standard.
Unit
11. Thermal Resistance
Parameters
Junction ambient when soldering to PCB
12. Operating Range
Parameters
Supply voltage range, pin 13
Ambient temperature
4
U2860B-M
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
Supply voltage range
VS
4.5
5.0
9.0
V
Supply current
IS
27
33
mA
VDC
1.75
Rin
680
DC Supply (Pin 13)
Intercarrier Input 1 (Pin 1)
DC input voltage
Input resistance(1)
Input limiting voltage
Input signal vin:
f = 5.5 MHz
output signal AF1:
vAF1 = –3 dB
vlim
V
750
Ω
150
µV
Intercarrier Input 2, Pin 14
DC input voltage
Input resistance
(1)
VDC
1.75
Rin
680
Input limiting voltage
Input signal vin:
f = 5.74 MHz
output signal AF2:
vAF2 = –3 dB
vlim
Input signal for automatic
second sound carrier mute off
(squelch)
Audio output AF2 active
vin
> 0.7
1.0
V
750
Ω
150
µV
< 1.5
mV
FM Demodulators, Internal VCO’s (Pin 10)
fVCO
5.5
MHz
∆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
Free-running frequency
Oscillator drift (free-running) as
function of temperature
Adjustment resistance for
free-running frequencies
∆fadj
±1
Rref
15
MHz
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
2.2
V
Audio Outputs, AF1 (Pin 7) and AF2 (Pin 6)
DC output voltage
DC output current
Output resistance
(1)
VDC
IDC
1.0
Rout
150
AC output peak current
iAC
Note:
1. This parameter is given as an application information and not measured during final testing.
–1.3
mA
±1.0
mA
5
4794E–TVVCR–12/05
13. Electrical Characteristics (Continued)
VS = 5V, Tamb = 25°C, reference point pin , unless otherwise specified
Parameters
Test Conditions
AF output voltage, RMS value
vin = 10 mV
f = 5.5 MHz
FM-dev. = 27 kHz
fmod = 1 kHz
Difference between the output
signals
Pin
Symbol
Min.
Typ.
500
vAF
∆vAF
Total harmonic distortion
vin = 10 mV
f = 5.5 MHz
FM-dev. = 27 kHz
fmod = 1 kHz
THD
AM suppression
vin = 10 mV
f = 5.5 MHz
fmod = 1 kHz
reference signal:
FM-dev. = 50 kHz
test signal: m = 30%
αAM
Crosstalk attenuation between
the AF outputs
f = 50 Hz to 12.5 kHz
Supply voltage ripple rejection
VRR < 200 mV, f = 70 Hz
Max.
0.1
46
Unit
mV
±1
dB
0.5
%
66
dB
αatt
70
dB
RR
24
dB
Mute Switch (Pin 3)
Control voltage
- mute off
- mute on
Control current
AF outputs active
AF outputs not active
Vmute
2.0
0
VS
0.8
150
Imute
V
V
µA
Squelch Function, (Pin 4)
Control voltage for
automatic mute 2nd carrier
- off
- on
Vsque
0
2.0
150
Control current
Isque
Note:
1. This parameter is given as an application information and not measured during final testing.
6
0.8
VS
V
V
µA
U2860B-M
4794E–TVVCR–12/05
U2860B-M
14. Diagrams
Figure 14-1. Total Harmonic Distortion
0.5
0.4
THD (%)
0.3
0.2
0.1
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
Frequency (MHz)
Figure 14-2. AM Suppression
0
AM Suppression (dB)
-10
-20
-30
-40
-50
-60
-70
-80
30
40
50
60
70
80
90
100
110
120
IF Input Level (dBµV)
Figure 14-3. VCO Free-running Frequency
120.0
Pin 10
open
umin (µV)
80.0
40.0
R10 = 30k
R10 = 15k
0.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
Frequency (MHz)
7
4794E–TVVCR–12/05
Figure 14-4. Capture and Hold Range
VCO Control Voltage U8 (V)
3.0
2.5
Input level = caption
2.0
Input level = hold
1.5
1.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
Frequency (MHz)
Figure 14-5. Limiter Characteristics
AF Output Level (dB)
2
-2
-6
-10
f = 5.5 MHz, FM-dev. = +/- 50 kHz,
fmod = 1 kHz, 50 µs de-emphasis
-14
-18
26
28
30
32
34
36
38
40
42
44
IF Input Level (dB)
Figure 14-6. Signal-to-noise Ratior
-50
-55
(S+N)/N (dB)
-60
-65
-70
-75
-80
0
2
4
6
8
10
Frequency (MHz)
8
U2860B-M
4794E–TVVCR–12/05
U2860B-M
15. Drawings
Figure 15-1. SIF Inputs
600Ω
1,14
1.75V
600Ω
Figure 15-2. Mute Switch/Squelch Switch
3.5V
20 kΩ
2 kΩ
Figure 15-3. Audio Outputs
6,7
100Ω
1.0 mA
9
4794E–TVVCR–12/05
Figure 15-4. Decoupling Capacitor
8,9
2.5 kΩ
Figure 15-5. VCO Offset (Reference Resistor)
3.5V
11.5 kΩ
10
22 kΩ
Figure 15-6. Internal Supply Voltage Stabilization
11
3.5V
10
U2860B-M
4794E–TVVCR–12/05
U2860B-M
16. Test Circuit and Application Circuit
Figure 16-1. Test Circuit
+5 V
22 mF
22 nF
Cstab
SIF 2
22 nF
10 µF
2.2 µF
2.2 µF
50Ω
14
13
12
11
10
9
8
U2860B-M
1
2
4
3
5
22 nF
7
6
3.3 k Ω
SIF 1
50 Ω
3.3 k Ω
15 nF
15 nF
Mute
Squelch
AF2
AF1
Figure 16-2. Application Circuit
+5 V
22 µF
2.2 k Ω
SFE 5.74 MC
1 kΩ
10 µF
2.2 µF
22 nF
680 Ω
14
13
12
11
2.2 µF
10
9
8
6
7
U2860B-M
SIF
680 Ω
1
2
3
4
SFE 5.5 MC
SFE 6.0 MC
Mute
Squelch
5
3.3 kΩ
3.3 kΩ
15 nF
15 nF
AF2
AF1
11
4794E–TVVCR–12/05
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
18. Package Information
Package SO14
5.2
4.8
Dimensions in mm
8.75
3.7
1.4
0.25
0.10
0.4
1.27
6.15
5.85
7.62
14
0.2
3.8
8
technical drawings
according to DIN
specifications
1
12
7
U2860B-M
4794E–TVVCR–12/05
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4794E–TVVCR–12/05
