tda7421n STMicroelectronics, tda7421n Datasheet - Page 12

• Manufacturer Part Number: tda7421n
• Description: Am/fm Tuner For Car Radio And Hi-fi Applications
• Manufacturer: STMicroelectronics

TDA7421N
ELECTRICAL CHARACTERISTICS (Continued)
12/38
Detuning Station Detector
Ref: FM Test Circuit; SEEK set to 1, HDDIS and SMDIS set to 1, measure:
- Input at V
- output at V
Adjacent Channel Station Detector
Ref: FM Test Circuit; SEEK set to 1, HDDIS and SMDIS set to 1, measure:
- Input at V
- output at V
AM Mixer 1
Ref: AM Test Circuit, measure input at V
AM Wide & Narrow AGC
Ref: AM Test Circuit; measure input at V
R
I
V
V
ACSD
V
V
AMAGC1PIN
ACSD
CP1
OUTAMAGC1
Symbol
R
WAGCMAX
IP3
NAGCMAX
WAGCMIN
NAGCMIN
CAdj1
G
DSD
IN,MIX1
MIX1
MIX1
MIX1
MAX
MIN
FMLIMIN
FMLIMIN
FMSD
FMSD
Detuning Station Detector
Threshold
Adjacent Channel Detector
Maximum Sensitivity Threshold
Adjacent Channel Detector
Minimum Sensitivity Threshold
Input Resistance
Conversion Gain
3rd Order Intermodulation
Distortion Intercept Point
1dB Compression Point
Value of the minimum adjusting
capacitance step
Open Loop WIDE AGC
Minimum Starting Point
Open Loop WIDE AGC
Maximum Starting Point
Open Loop NARROW AGC
Minimum Starting Point
Open Loop NARROW AGC
Maximum Starting Point
Output Resistance
Maximum Antenna Attenuation
Diode Current
, CW;
: desired 10.7MHz, 95dB V CW; undesired 10.8MHz CW
Parameter
MIX1AMIN
MIX1AMIN
frequency shift from 10.7MHz at
which V
amplitude of undesired signal at
which V
set to 11111
amplitude of undesired signal at
which V
set to 00000
f
f
f
f
T1A3-0 set to 1000
f
set to 11; V
V
f
set to 00; V
V
f
set to 11; V
V
f
set to 00; V
V
f
120dB V; AAGW1-0 set to 00
IN
d
u2
IN
WAGCIN
WAGCIN
NAGCIN
NAGCIN
WAGCIN
, output at V
and V
AMAGC1AMP
AMAGC1AMP
AMAGC1AMP
AMAGC1AMP
= 1MHz; f
= 1MHz
= 1MHz
= 1.2MHz
MIX2AMIN
FMSD
FMSD
FMSD
= 10.7MHz, AAGN1-0
= 10.7MHz, AAGN3-0
Test Condition
= 999kHz, AAGW1-0
= 999kHz, AAGW1-0
= 999kHz; V
MIX1AMIN
MIX1AMIN
MIX2AMIN
MIX2AMIN
u1
MIXOUT
= 2.5V
= 2.5V
= 2.5V
= 2.5V
= 2.5V
= 2.5V, HDM4-0
= 2.5V, HDM4-0
= 1.1MHz;
, output at V
at which
at which
at which
at which
MIX1AMIN
AMAGC1AMP
=
Min.
and V
Typ.
92.5
94.9
0.38
23.3
±28
131
110
101
1.2
7.6
1.4
95
81
87
AMAGC1PIN
Max.
dB V
dB V
dB V
dB V
dB V
dB V
dB V
dB V
Unit
KHz
K
K
mA
dB
pF