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TDA7421 数据表(PDF) 11 Page - STMicroelectronics

部件名 TDA7421
功能描述  AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS
PDF  38 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TDA7421 数据表(HTML) 11 Page - STMicroelectronics

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



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