STMICROELECTRONICS TDA7220

TDA7220
VERY LOW VOLTAGE AM-FM RADIO
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OPERATING SUPPLY VOLTAGE : 1.5 TO 6V
HIGH SENSITIVITY AND LOW NOISE
LOW BATTERY DRAIN
VERY LOW TWEET
HIGH SIGNAL HANDLING
VERY SIMPLE DC SWITCHING OF AM-FM
AM SECTION OPERATES UP TO 30MHz
DIP16
DESCRIPTION
The TDA 7220 is a monolithic integrated circuit in
a 16-lead dual in-line plastic package designed for
use in 3V, 4.5V and 6V portable AM-FM radio
receivers.
The functions incorporated are :
AM Section
- Preamplifier and do uble balance d mixer
with AGC
- On pin local oscillator
- IF amplifier with internal AGC
- Detector and audio preamplifier
FM SECTION
- IF amplifier and limiter
- Quadrature detector
- Audio preamplifier
ORDERING NUMBER : TDA7220
SO16
ORDERING NUMBER : TDA7220D
PIN CONNECTION
June1993
1/16
TDA7220
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
VS
Ptot
Toper
Tstg, Tj
Parameter
Supply Voltage
o
Total Power Dissipation at Tamb < 110 C (DIP16)
Operating Temperature
Storage and Junction Temperature
Value
6.5
400
- 20 to + 85
- 55 to +150
Unit
V
mW
o
C
oC
THERMAL DATA
Symbol
R th (j-a)
2/16
Parameter
Junction-ambient Thermal Resistance
Max.
DIP16
100
SO16
200
Unit
C/W
o
TDA7220
ELECTRICAL CHARACTERISTICS (Tamb = 25oC, VS = 3V, unless specified, refer to Test Circuit)
Symbol
ID
Parameter
Drain Current
Test Conditions
Min.
Typ.
Max.
Unit
AM Section
FM Section
11
10
18
15
mA
mA
S/N = 26dB, m = 0.3
12
25
µV
AM SECTION (fO = 1MHz, fm = 1kHz)
VI
Input Sensitivity
S/N
Signal to Noise
VI = 1mV, m = 0.3
40
∆VI
AGC Range
∆VOUT = 10dB, m = 0.8
90
VO
Recovered Audio Signal (Pin 9)
VI = 1mV, m = 0.3
40
0.5
d
Distortion
VH
Max. Input Signal Handling Capability
m = 0.8, d < 10%
RI
Input Resistance between Pins 2 and 4
m=0
CI
Input Capacitance between Pins 2 and 4
m=0
RO
Output Resistance (Pin 9)
50
dB
dB
80
110
mV
0.6
%
7.5
kΩ
V
18
pF
4.5
kΩ
Tweet 2 IF
VI = 1mV, m = 0.3
40
dB
Tweet 3 IF
VI = 1mV, m = 0.3
55
dB
FM SECTION (fO = 10.7MHz, fm = 1kHz)
VI
- 3dB limiting point
33
Amplitude Modulation Rejection
∆f = ± 22.5kHz, VI = 3mV,
m=3
40
dB
S/N
Signal to Noise
∆f = ± 22.5kHz, VI = 1mV
65
dB
Distortion
∆f = ± 22.5kHz, VI = 1mV
∆f = ± 75kHz
d
∆f = ± 22.5kHz, VI = 1mV
50
40
80
µV
Input Limiting Voltage
AMR
0.3
1.1
1.5
%
%
70
90
mV
VO
Recovered Audio SIgnal (Pin 9)
RI
Input Resistance between Pin 16 and Ground
6.5
CI
Input Capacitance between Pin 16 and Ground
14
pF
RO
Output Resistance (Pin 9)
4.5
kΩ
kΩ
3/16
TDA7220
ELECTRICAL CHARACTERISTICS (Tamb = 25oC, VS = 1.6V, unless specified, refer to Test Circuit)
Symbol
ID
Parameter
Drain Current
Test Conditions
Min.
Typ.
Max.
Unit
AM Section
FM Section
8
7
15
13
mA
mA
15
25
µV
AM SECTION (fO = 1MHz, fm = 1kHz)
VI
Input Sensitivity
S/N = 26dB, m = 0.3
S/N
Signal to Noise
VI = 1mV, m = 0.3
40
∆VI
AGC Range
∆VOUT = 10dB, m = 0.8
90
VO
Recovered Audio Signal (Pin 9)
VI = 1mV, m = 0.3
40
0.5
d
Distortion
VH
Max. Input Signal Handling Capability
m = 0.8, d < 10%
RI
Input Resistance between Pins 2 and 4
m=0
CI
Input Capacitance between Pins 2 and 4
m=0
RO
Output Resistance (Pin 9)
Tweet 2 IF
VI = 1mV, m = 0.3
Tweet 3 IF
48
dB
75
mV
0.5
%
7.5
kΩ
dB
V
18
pF
4.5
kΩ
40
dB
55
dB
FM SECTION (fO = 10.7MHz, fm = 1kHz)
Input Limiting Voltage
- 3dB limiting point
50
µV
AMR
Amplitude Modulation Rejection
∆f = ± 22.5kHz, VI = 3mV,
m=3
34
dB
S/N
Signal to Noise
∆f = ± 22.5kHz, VI = 1mV
55
dB
VI
Distortion
∆f = ± 22.5kHz, VI = 1mV
0.6
%
VO
Recovered Audio SIgnal (Pin 9)
∆f = ± 22.5kHz, VI = 1mV
55
mV
RI
Input Resistance between Pin 16 and Ground
6.5
kΩ
CI
Input Capacitance between Pin 16 and Ground
14
pF
RO
Output Resistance (Pin 9)
4.5
kΩ
d
4/16
TDA7220
Figure 1 : Test Circuit
Figure 2 : P.C. Board and Component Layout (1:1 scale) of the Test Circuit
5/16
TDA7220
AM-FM SWITCHING
AM-FM switching is achieved by applying a DC voltage at pin 13, to switch the internal reference.
TYPICAL DC VOLTAGE (refer to the test circuit)
Pins
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Unit
AM
3
1.1
3
1.1
1.1
2.5
3
0.7
1.2
3
0
2.1
2.1
2.9
3
2.9
V
FM
3
0
3
0
0
2.4
3
0
0.9
3
0
3
3
2.7
2.7
2.7
V
APPLICATION SUGGESTION
Recommended values referred to the test circuit of Figure 1
Part
Number
Recommended
Value
C1
100µF
AGC Bypass
C2 (1)
100nF
AM Input DC Cut
C3 (1)
10nF
FM Input DC Cut
C4
C5
20nF
20nF
FM Amplifier Bypass
C7
100nF
FM detector Decoupling
Danger of RF Irradiation
C8
100nF
Power Supply Bypass
Noise increase of the audio
output
C9
10µF
AGC Bypass
Increase of the distortion at
low audio frequency
C10 (1)
56pF
Tuning of the AM
Oscillator at 1455kHz
C11
10nF
50ms FM De-emphasis
C12
100nF
Output DC Decoupling
Low audio frequency cut
C13
220µF
Power Supply Decoupling
Increase of the distortion at
low frequency
C16
2.7nF
AM Detector capacitor
Low suppression of the IF
frequency and harmonics
Increase of the audion
distortion
R1 (1)
68Ω
FM Input Matching
R2 (1)
56Ω
AM Input Matching
R3
330Ω
Ceramic Filter Matching
R4
6.8kΩ
FM Detector Coil Q Setting
Audio output decrease and
lower distortion
Audio output increase and
higher distortion
R5
560Ω
FM Detector Load Resistor
Audio output decrease and
higher AMR
R6
13kΩ
AM Detector Coil Q Setting
Lower IF Gain and Lower
AGC Range
(1) Only for test circuit.
6/16
Purpose
Smaller than
Recommended Value
Larger than
Recommended Value
Increase of the distortion at
low audio frequency
Increase of the AGC time
constant
Reduction of sensitivity
- bandwidth increase
- higher noise
Increase of the AGC time
constant
Higher IF Gain and Lower
AGC Range
TDA7220
Figure 3 :
Audio Output and Noise versus Input
Signal (AM section) VS = 3V
Figure 4 :
Audio Output and Noise versus Input
Signal (AM section) VS = 1.6V
Figure 5 :
Distortion versus Input Signal
(AM section) VS = 3V
Figure 6 :
Distortion versus Input Signal
(AM section) VS = 1.6V
Figure 7 :
Audio Output versus Supply Voltage
(AM section)
Figure 8 :
Amplified AGC Voltage (Pin 4) versus
Input Signal (AM section)
7/16
TDA7220
Figure 9 :
Audio Output and Noise versus Input
Signal (FM section) VS = 3V
Figure 10 : Audio Output and Noise versus Input
Signal (FM section) VS = 1.6V
Figure 11 : Distortion versus Input Signal
(FM section) VS = 3V
Figure 12 : Distortion versus Input Signal
(FM section) VS = 1.6V
Figure 13 : Audio Output versus Supply Voltage
(FM section)
Figure 14 : Amplified AGC Voltage (Pin 4) versus
Input Signal (FM section)
8/16
TDA7220
Figure 15 : DC Output Voltage (Pin 9) versus
Supply Voltage (FM section)
Figure 16 : AFC Output Voltage (Pin 9) versus
Frequency Deviation (FM section)
Figure 17 : Drain Current versus Supply Voltage
APPLICATION INFORMATION
TYPICAL PERFORMANCE OF THE RADIO RECEIVER OF FIGURE 18 (VS = 3V, RL = 32Ω)
Parameter
Wavebands
Sensitivity
Distortion
(fm = 1kHz)
Signal to Noise
(fm = 1kHz)
Amplitude Modulation Rejection
Quiescent Current
Supply Voltage Range
Test Conditions
FM
AM
FM
AM
AM
FM
AM
FM
AM
FM
S/N = 26dB, ∆f = 22.5kHz
S/N = 6dB, m = 0.3
S/N = 26dB, m = 0.3
∆f = 22.5kHz
PO = 20mW
∆f = 75kHz
VI = 100µV
m = 0.3
∆f = 22.5kHz
PO = 20mW
VI = 100µV
m = 0.3
VI = 100µV, ∆f = 22.5kHz, m = 0.3
Value
87.5 to 108
510 to 1620
3
2
10
0.5
1.8
1.1
60
45
40
16
1.6 to 3
Unit
MHz
kHz
µV
µV
µV
%
%
%
dB
dB
dB
mA
V
9/16
TDA7220
APPLICATION INFORMATION
Figure 18 : Stereo AM/FM Miniradio
10/16
TDA7220
Figure 19 : 0.3W AM/FM Monoradio
11/16
TDA7220
TYPICAL APPLICATION
12/16
TDA7220
13/16
TDA7220
SO16 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
TYP.
A
a1
inch
MAX.
TYP.
1.75
0.1
MAX.
0.069
0.25
a2
0.004
0.009
1.6
0.063
b
0.35
0.46
0.014
0.018
b1
0.19
0.25
0.007
0.010
C
0.5
0.020
c1
45 (typ.)
D
9.8
10
0.386
0.394
E
5.8
6.2
0.228
0.244
e
1.27
0.050
e3
8.89
0.350
F
3.8
4.0
0.150
0.157
L
0.4
1.27
0.016
0.050
M
S
14/16
MIN.
0.62
0.024
8 (max.)
TDA7220
DIP16 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
a1
0.51
B
0.77
TYP.
inch
MAX.
MIN.
TYP.
MAX.
0.020
1.65
0.030
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
17.78
0.700
F
7.1
0.280
I
5.1
0.201
L
Z
3.3
0.130
1.27
0.050
15/16
TDA7220
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
 1994 SGS-THOMSON Microelectronics - All Rights Reserved
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