TDA7421 Datasheet, PDF (11/38 Pages) STMicroelectronics – AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS

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
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