參數(shù)資料
型號: TDA7421N
廠商: STMICROELECTRONICS
元件分類: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封裝: TQFP-64
文件頁數(shù): 9/47頁
文件大?。?/td> 374K
代理商: TDA7421N
TDA7421N
Electrical specifications
AM wide and narrow AGC
Ref: AM test circuit; measure input at VMIX1AMIN and VMIX2AMIN, output at VAMAGC1AMP and VAMAGC1PIN
VWAGCMIN
Open loop wide AGC minimum
starting point
fWAGCIN = 999 kHz, AAGW1-0
set to 11; VMIX1AMIN at which
VAMAGC1AMP = 2.5V
95
dB
μV
VWAGCMAX
Open loop wide AGC maximum
starting point
fWAGCIN = 999 kHz, AAGW1-0
set to 00; VMIX1AMIN at which
VAMAGC1AMP = 2.5V
101
dB
μV
VNAGCMIN
Open loop narrow AGC
minimum starting point
fNAGCIN = 10.7 MHz, AAGN1-0
set to 11; VMIX2AMIN at which
VAMAGC1AMP = 2.5V
81
dB
μV
VNAGCMAX
Open loop narrow AGC
maximum starting point
fNAGCIN = 10.7 MHz, AAGN3-0
set to 00; VMIX2AMIN at which
VAMAGC1AMP = 2.5V
87
dB
μV
ROutAMAGC1 Output resistance
23.3
k
Ω
IAMAGC1PIN
Maximum antenna attenuation
diode current
fWAGCIN = 999 kHz; VMIX1AMIN
= 120dB
μV; AAGW1-0 set to 00
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).
RIN,MIX2
Input resistance
5
K
Ω
GMIX2
Maximum conversion gain
fIN = 10.7 MHz
25
dB
IP3MIX2
3rd order intermodulation
distortion intercept point
fd = 10.7 MHz; fu1 = 10.8 MHz;
fu2 = 10.9 MHz
117
dB
μV
CP1MIX2
1dB compression point
fIN = 10.7 MHz
107
dB
μV
CAdj2
Value of the minimum adjusting
capacitance step
T2A3-0 set to 0001
1.57
pF
AGCMIXSP AGC2 starting point on mixer 2
fIN = 10.7 MHz; Value of
VMIX2AMIN for which VMIX2OUT
is 1 dB compressed;
IF2A1-0 set to 10
48
dB
μV
AGCMIXIS
AGC2 intervention slope on
mixer 2
fIN = 10.7 MHz:ΔVMIX2OUT for
ΔV
MIX2AMIN = 1 dB;
IF2A1-0 set to 10
0.1
dB/dB
AGCMIXR
AGC2 range on mixer 2
fIN = 10.7 MHz; range of
VMIX2AMIN above AGCMIXSP for
which VMIX2OUT is not
increasing linearly with a
1dB/dB slope; IF2A1-0 set to 10
50
dB
AM IF2 amplifier
Ref: AM test circuit; fIN = 450 kHz, measure input at VIF2AMPIN, output at VIF2AMPOUT (switches must be in position 1).
RIN,IF2AMP Input resistance
2
k
Ω
Table 7.
Electrical characteristics (continued)
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
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