U2861B ATMEL Corporation, U2861B Datasheet

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U2861B

Manufacturer Part Number
U2861B
Description
Manufacturer
ATMEL Corporation
Datasheet

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Features
1. 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 switch-
able audio inputs and volume control. With a supply voltage of 5V, the U2861B is
suitable for TV, VCR and Multimedia applications.
Figure 1-1.
Completely Alignment-free
PLL Demodulator for FM Intercarrier Sound IF Signals (Mono)
Two Audio Switches
Very Few External Components
Volume Control by DC Voltage
Supply Voltage: 5V
Pb-free Package, which is Compliant with Requirements of RoHS
Sound IF
input
VI,SIF
3
GND
4
Block Diagram
VCO
Decoupling
CDEC
2
VMUTE
5
mute
FM
VI,AF1
CDEM
5 k
De-
emphasis
14
AF1IN
1
Switch1
VO,AF1
switch1
Audio
13
VSW1
12
AF1OUT
VI,AF2
10
AF2IN
VSW2
11
switch2
Switch2
Audio
CREF
6
Bandgap
reference
VVOl
Volume
control
VS
9
VS
7
8
VO,AF2
AF2OUT
Mono FM Sound
Demodulator for
TV Systems
U2861B
Rev. 4798B–TVVCR–07/05

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U2861B Summary of contents

Page 1

... 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 switch- able audio inputs and volume control. With a supply voltage of 5V, the U2861B is suitable for TV, VCR and Multimedia applications. Figure 1-1. Block Diagram ...

Page 2

... 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 voltage at pin 9. 2.4 Internal Voltage Stabilizer The internal band-gap reference ensures constant performance independent of supply voltage and temperature. U2861B [Preliminary] 2 4798B–TVVCR–07/05 ...

Page 3

... Audio switch 2 12 VO,AF1 Switched audio output 1 13 VSW1 Audio switch 1 14 CDEM De-emphasis and mute switch 4798B–TVVCR–07/05 VI,AF1 1 14 CDEC VI,AF1 12 U2861B 4 GND 11 VMUTE CREF U2861B [Preliminary] CDEM VSW1 VO,AF1 VSW2 VI,AF2 VVOl VO,AF2 3 ...

Page 4

... V S Output currents External voltages Junction temperature Storage temperature (1) Electrostatic handling Note: 1. Equivalent to discharging a 200-pF capacitor through a 0- resistor 5. Thermal Resistance Parameters Junction ambient when soldered to PCB SO14 package U2861B [Preliminary] 4 Pin Symbol out ...

Page 5

... FM-deviation = 27 kHz kHz mod mV 5.5 MHz in FM-deviation = 27 kHz kHz mod mV 5.5 MHz kHz in mod Reference signal: FM-deviation = 27 kHz Test signal 30% V < 200 mV U2861B [Preliminary] Symbol Min. Typ. Max 4.5 5.0 6 150 i,SIF V 1 ...

Page 6

... This parameter is given as application information and is not tested during production. 2. Without external control voltage at pin 13, the internal FM is demodulated. 3. Without control voltage at pin 11, the audio signal from switch 1 is automatically selected. With V11 < 1.5 or V11 > 4.0V input pin 10 is selected. U2861B [Preliminary] 6 Test Conditions (2) (3) AF “ ...

Page 7

... SIF AF1 FM mute in (intercarrier) switch AF1 out Switch1 Switch2 µ U2861B µF 2.2 µF in 680 SFE 5.5 MC U2861B [Preliminary] AF2 in out Volume control 1 µ µF 22 µ AF2 AF2 in out Volume control 1 µF 1 µ ...

Page 8

... Internal Pin Configuration Figure 7-1. Figure 7-2. Figure 7-3. Figure 7-4. U2861B [Preliminary] 8 Audio Input 1 (Pin 1) 1 Decoupling Capacitor (Pin 2 Sound IF Input (Pin 3) 3 Internal Reference Voltage (Pin 2.5 k 600 1.75 V 600 4798B–TVVCR–07/05 ...

Page 9

... Figure 7-5. Figure 7-6. Figure 7-7. Figure 7-8. 4798B–TVVCR–07/05 Audio Output 2 (Pin 8) 100 8 Volume Control (Pin 9) 9 Audio Input 2 (Pin 10) 10 Audio Switch 2 (Pin 11) 2 U2861B [Preliminary] 1 ...

Page 10

... Figure 7-9. Figure 7-10. Switch 1 (Pin 13) Figure 7-11. De-emphasis (Pin 14) Figure 7-12. Mute switch (Pin 5) U2861B [Preliminary] 10 Audio Output 2 (Pin 12) 12 100 3 3 1.2 mA 2.4 V 2.3 V 4798B–TVVCR–07/05 ...

Page 11

... Ordering Information Extended Type Number U2861B-MFPG3Y U2861B-MFPY 9. Package Information Package SO14 Dimensions in mm 4798B–TVVCR–07/05 Package SO14, Pb-free SO14, Pb-free 8.75 1.4 0.25 0.4 0.10 1.27 7. U2861B [Preliminary] Remarks Standard Package Quantity Taped and reeled Tube 5.2 4.8 3.7 0.2 3.8 6.15 5.85 technical drawings according to DIN specifications 4,000 3,100 11 ...

Page 12

... Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. © Atmel Corporation 2005. All rights reserved. Atmel marks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. Atmel Operations Memory ...

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