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TDA7421 数据表(PDF) 10 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) 10 Page - STMicroelectronics

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ELECTRICAL CHARACTERISTICS (continued)
Adjacent Channel Station Detector
Ref: FM Test Circuit, measure:
- Input at VFMLIMIN: desired 10.7MHz, 95dBu CW; undesired 10.8MHz CW
- output at VFMSD
- FMRECSEEK set to 1
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
ACSDMAX
Adjacent Channel Detector
Maximum Sensitivity Threshold
amplitude of undesired signal at
which VFMSD = 2.5V, HDM4-0 set
to 11111
92.5
dBu
ACDMIN
Adjacent Channel Detector
Minimum Sensitivity Threshold
amplitude of undesired signal at
which VFMSD = 2.5V, HDM4-0 set
to 00000
94.9
dBu
AM Section Global Performances
Refer to Evaluation Circuit and enclosed curves (S+N/N, THD)
- RF Input: fc = 1MHz, f mod = 1KHz, m = 0.3;
- Audio Output: BPF 20Hz - 20KHz
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
VIN MIN
Maximum Sensitivity
VINRF = 74dBu;
∆VAF = - 20dB
20
dBu
VIN US
Usable Sensitivity
S+N/N = 20dB
31
dBu
∆Vis
AGC Range
VINRF = 74dBu;
∆VAF = -10dB
50
dB
S+N/N
Signal to Noise Ratio
VINRF = 74dBu
46.0
53.0
dB
αIMAG
Image Rejection
f1 = 1.9MHz
f2 = 22.4MHz
dB
αTw
Tweet
VINRF = 74dBu; f1 = 900KHz;
f2 = 1350KHz
1.2
dB
THD
Total Harmonic Distortion
VINRF = 74dBu; m = 0.3
0.45
1.0
%
VINRF = 74dBu; m = 0.8
1.73
%
VINRF = 120dBu; m = 0.3
0.33
%
VAF
Audio Output Level
VINRF = 74dBu
137
167
197
mVRMS
VAMST
AM IF2 Output level
VINRF = 74dBu
106
dBu
AM Mixer 1
Ref: AM Test Circuit, measure input at VMIX2AMIN, output at VMIXOUT
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
RINMIX1
Input Resistance
1.2
K
Ω
GMIX1
Conversion Gain
fIN = 1MHz
7.5
8.5
9.5
dB
IP3MIX1
3rd Order Intermodulation
Distortion Intercept Point
fd = 1MHz; fu1 = 1.1MHz;
fu2 = 1.2MHz;
115
dBu
CP1MIX1
1dB Compression Point
fIN = 1MHz
98.7
dBu
TDA7421
10/38



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