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PDF TDA7421 Data sheet ( Hoja de datos )

Número de pieza TDA7421
Descripción AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS
Fabricantes ST Microelectronics　
Logotipo ST Microelectronics Logotipo



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® TDA7421
AM/FM TUNER FOR CAR RADIO
AND Hi-Fi APPLICATIONS
FRONT-END FOR AM/FM RECEIVERS
UP-CONVERSION ARCHITECTURE FOR AM
HIGH SPEED PLL WITH INLOCK DETECTOR
FOR OPTIMIZED RDS APPLICATIONS
SINGLE FREQUENCY REFERENCE FOR AM/FM
AM/FM STATION DETECTOR
µP-CONTROLLED COMPENSATION OF EX-
TERNAL COMPONENTS SPREAD
ADJUSTABLE AUDIO MUTE
FULLY PROGRAMMABLE BY I2C BUS
ADVANCED BICMOS TECHNOLOGY
GENERAL DESCRIPTION
The TDA7421 is a high performance tuner circuit
that integrates AM/FM sections, IF counter and
PLL synthesizer on a single chip.
Use of BICMOS technology allows the implemen-
tation of tuning functions with a minimum of exter-
nal components.
Value spread of external components can be fully
PINS CONNECTION
TQFP64
ORDERING NUMBER: TDA7421
compensated by means of on-chip electrical ad-
justment controlled by external µP.
The Automatic Gain Control (AGC) operates on
different sensitivities and bandwidths in order to
improve sensitivity and dynamic range. I2C bus
allows to control selected functions of the tuner
(AGC and amplifiers gain, PLL and counters op-
eration modes).
AM MIX1 IN -
AM MIX1 IN +
FM MIX IN -
FM MIX IN +
FM RF AGC IN
FM AGC OUT
RF GND
VCO B
VCO E
OSC GND
XTAL D
XTAL G
OSC VCC
FM ANT ADJ
FM RF ADJ
PLL VCC
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
1 48
2 47
3 46
4 45
5 44
6 43
7 42
8 41
9 40
10 39
11 38
12 37
13 36
14 35
15 34
16 33
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
FM IF AMP2 OUT
IF1 VCC
FM LIM IN +
FM LIM IN -
IF1 GND
FM BW TC
FM MUTE DRIVE
FM SMETER AM SMETER
FM DET ADJ
FM SD AM SD
AUDIO OUT
FM QUAD+
FM QUAD-
IF2 VCC
AM IF2 IN
AM REF
AM BPF
D96AU546A
June 1998
1/38

1 page




TDA7421 pdf
TDA7421
ELECTRICAL CHARACTERISTICS
DC PARAMETERS (Tamb = 25°C; Vcc = 8.5V, Vdd = 5V unless otherwise specified)
Symbol
DIG Vdd
DIG Idd
Parameter
Digital Supply Voltage
Digital Supply Current
PLL VCC
PLL ICC
PLL Supply Voltage
PLL Supply Current
RF VCC
RF ICC
RFSupply Voltage
RF Supply Current
IF1 VCC
IF1 ICC
IF1 Supply Voltage
IF1 Supply Current
IF2 VCC
IF2 ICC
IF2 Supply Voltage
IF2 Supply Current
OSC VCC Oscillator Supply Voltage
OSC ICC Oscillator Supply Current
TOTAL ICC Total Supply Current
Test Condition
AM MODE
FM MODE
AM MODE
FM MODE
AM MODE
FM MODE
AM MODE
FM MODE
AM MODE
FM MODE
AM MODE
FM MODE
AM MODE
FM MODE
Min.
4.75
4.0
3.5
7.5
1.2
2.5
7.5
15.0
10.0
7.5
2.2
16.0
7.5
8.5
27.0
7.5
14.5
11.0
45.0
73.0
Typ.
4.6
4.0
1.6
3.0
17.5
13.0
2.7
19.5
10.5
32.0
17.0
14.0
50.0
81.0
Max.
5.25
5.2
4.5
10
2.0
3.5
10
20.0
16.0
10
3.2
23.0
10
12.5
37.0
10
19.5
17.0
55.0
89.0
Unit
V
mA
mA
V
mA
mA
V
mA
mA
V
mA
mA
V
mA
mA
V
mA
mA
mA
mA
AC PARAMETERS
Ref: FM Test Circuit measure Vosc with high impedance FET probe
Voltage Controlled Oscillator (VCO)
Symbol
fVCOmin
Parameter
Minimum VCO Frequency
fVCOmax Maximum VCO Frequency
VOSC
Oscillator Amplitude
Test Condition
Vturn = 0, Europe/USA
Japan
Vturn = VCC, Europe/USA
Japan
fosc = 108.8MHz, Europe/USA
fOSC = 72.3MHz, Japan
Reference Oscillator
Ref: AM Test Circuit measure VXTAL with high impedance FET probe
Symbol
Parameter
Test Condition
fXTAL
VXTAL
Reference Frequency
Oscillator Amplitude
Min.
123.2
79.2
Typ.
80.9
55
128
90
106
Max.
98.2
65.4
Uni
MHz
MHz
MHz
MHz
dBu
Min.
Typ.
10.25
108
Max.
Uni
MHz
dBu
5/38

5 Page





TDA7421 arduino
TDA7421
ELECTRICAL CHARACTERISTICS (continued)
AM Wide & Narrow AGC
Ref: AM Test Circuit, input at VMIX1AMIN, and VMIX2AMIN, output at VAMAGC1AMP, andVAMAGC1PIN
Symbol
VWAGCTYP
Parameter
Open Loop WIDE AGC Typical
Starting Point
VWAGCMIN Open Loop WIDE AGC Minimum
Starting Point
VWAGCMAX Open Loop WIDE AGC Maximum
Starting Point
VNAGCTYP Open Loop NARROW AGC
Typical Starting Point
VNAGCMIN Open Loop NARROW AGC
Minimum Starting Point
VNAGCMAX Open Loop NARROW AGC
Maximum Starting Point
ROUTAMAGC1 Output Resistance
IAMAGC1PIN Maximum Pin-diode Current
Test Condition
fWAGCIN = 1MHz, AAG3-0 set to
1000; VMIX1AMIN at which
VAMAGC1AMP = 2.5V
fWAGCIN = 1MHz, AAG3-0 set to
0000; VMIX1AMIN at which
VAMAGC1AMP = 2.5V
fWAGCIN = 1MHz, AAG3-0 set to
1111; VMIX1AMIN at which
VAMAGC1AMP = 2.5V
fNAGCIN = 10.7MHz, AAG3-0 set
to 1000; VMIX2AMIN at which
VAMAGC1AMP = 2.5V
fNAGCIN = 10.7MHz, AAG3-0 set
to 0000; VMIX2AMIN at which
VAMAGC1AMP = 2.5V
fNAGCIN = 10.7MHz, AAG3-0 set
to 1111; VMIX2AMIN at which
VAMAGC1AMP = 2.5V
fWAGCIN = 1MHz;
VMIX1AMIN = 90dBu; AAG3-0 set to
0000
Min. Typ. Max.
91.3
80.6
95.6
93.2
82.8
97.4
23.3
1.4
Unit
dBu
dBu
dBu
dBu
dBu
dBu
KΩ
mA
AM Mixer 2
Ref: AM Test Circuit, measure input at VMIX2AMIN, output at VMIX2OUT, (switches must be in position 2 for
AGC measurements).
Symbol
RINMIX2
GMIX2
IP3MIX2
CP1MIX2
AGCMIXCP
AGCMIXSP
AGCMIXR
Parameter
Input Resistance
Maximum conversion Gain
3rd Order Intermodulation
Distortion Intercept Point
1dB Compression Point
Central Point of AGC2 Intevention
on Mixer 2
AGC2 Starting Point on Mixer 2
AGC2 Range on Mixer 2
Test Condition
fIN = 10.7MHz
fd = 10.7MHz; fu1 = 10.8MHz;
fu2 = 10.9MHz;
fIN = 10.7MHz
fIN = 10.7MHz;
VMIX2AMIN = 52dBu;
Value of VMIX2OUT
fIN = 10.7MHz; Value of VMIX2AMIN
for which VMIX2OUT is AGCMIXCP -
3dB
fIN = 10.7MHz; Range of
VMIX2AMIN for which VMIX2OUT is
AGCMIXCP ±3dB
Min.
Typ.
5
19.6
122
90.7
61.2
40
24
Max.
Unit
KΩ
dB
dBu
dBu
dBu
dBu
dB
11/38

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