ATMEL U2860B-MFP

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
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 5 V supply
voltage, the U2860B-M is suitable for TV, VCR and multimedia applications.
Dual-Channel
FM Sound
Demodulator for
TV Systems
U2860B-M
Figure 1. 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. 4794A–TVVCR–02/04
Pin Configuration
Figure 2. Pinning
Vin1
NC
Vmute
Vsque
NC
VAF2
VAF1
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Vin2
VS
GND
Cstab
Rref
C9
C8
Pin Description
2
Pin
Symbol
1
Vin1
Intercarrier input of sound channel 1 (5.5 MHz)
Function
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)
U2860B-M
4794A–TVVCR–02/04
U2860B-M
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.
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.
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.
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.
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.
Mute Switch
Simultaneous muting of both circuits is possible by switching pin 3 to ground.
Internal Voltage
Stabilizer
The internal bandgap reference ensures constant performance independent of supply
voltage and temperature.
3
4794A–TVVCR–02/04
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
VS
9.0
V
Supply current
13
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
4.5 V
V
V
V
Tj
+125
°C
Tstg
-25 to +125
°C
VESD
±200
V
Symbol
Value
Unit
RthJA
90
K/W
Symbol
Value
Unit
VS
4.5 to 9.0
V
Tamb
0 to 85
°C
Power dissipation VS = +9 V
Output currents
External voltages
Junction temperature
Storage temperature
Electrostatic handling
Notes:
(1)
all pins
1. Machine model in accordance with ESD S5.2 standard.
Thermal Resistance
Parameters
Junction ambient when soldering to PCB
Operating Range
Parameters
Supply voltage range, pin 13
Ambient temperature
4
U2860B-M
4794A–TVVCR–02/04
U2860B-M
Electrical Characteristics
VS = 5 V, 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
DC input voltage
VDC
1.75
Input resistance(1)
Rin
680
DC Supply (Pin 13)
Intercarrier Input 1 (Pin 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)
Free-running frequency
fVCO
5.5
MHz
∆T = 55° C
∆fVCO
500
kHz
Oscillator shift (free-running)
as function of supply voltage
4.5 V < VS < 5.5 V
∆fVCO
200
kHz
Adjustment range of
free-running frequencies
By external resistor Rref at
pin 10
∆fadj
±1
Rref
15
Oscillator drift (free-running) as
function of temperature
Adjustment resistance for
free-running frequencies
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
Audio Outputs, AF1 (Pin 7) and AF2 (Pin 6)
VDC
2.2
DC output current
IDC
1.0
Output resistance(1)
Rout
150
AC output peak current
iAC
DC output voltage
Note:
V
-1.3
mA
Ω
±1.0
mA
1. This parameter is given as an application information and not measured during final testing.
5
4794A–TVVCR–02/04
Electrical Characteristics (Continued)
VS = 5 V, 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.
vAF
Typ.
500
∆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
Imute
VS
0.8
150
V
V
µA
Squelch Function, (Pin 4)
Control voltage for
automatic mute 2nd carrier
- off
- on
Control current
Note:
6
Vsque
0
2.0
Isque
0.8
VS
150
V
V
µA
1. This parameter is given as an application information and not measured during final testing.
U2860B-M
4794A–TVVCR–02/04
U2860B-M
Figure 3. 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 4. 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 5. 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
4794A–TVVCR–02/04
Figure 6. 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 7. 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 8. 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
4794A–TVVCR–02/04
U2860B-M
Figure 9. SIF Inputs
600 Ω
1,14
1.75 V
600 Ω
Figure 10. Mute Switch/Squelch Switch
3.5 V
20 k Ω
2kΩ
Figure 11. Audio Outputs
6,7
100 Ω
1.0 mA
9
4794A–TVVCR–02/04
Figure 12. Decoupling Capacitor
8,9
2.5 k Ω
Figure 13. VCO Offset (Reference Resistor)
3.5
V
11.5 k Ω
10
22 k Ω
Figure 14. Internal Supply Voltage Stabilization
11
3.5 V
10
U2860B-M
4794A–TVVCR–02/04
U2860B-M
Figure 15. 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. 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 k Ω
3.3 kΩ
15 nF
15 nF
AF2
AF1
11
4794A–TVVCR–02/04
Figure 17. PCB Layout (Test/Application Circuit)
Figure 18. Component Layout (Test Circuit)
Figure 19. Component Layout (Application Circuit)
12
U2860B-M
4794A–TVVCR–02/04
U2860B-M
Ordering Information
Extended Type Number
Package
Remarks
U2860B-MFP
SO14
Tube
U2860B-MFPG3
SO14
Taped and reeled
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
7
13
4794A–TVVCR–02/04
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4794A–TVVCR–02/04