tda7421n STMicroelectronics, tda7421n Datasheet - Page 8

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

TDA7421N
ELECTRICAL CHARACTERISTICS (Continued)
8/38
Reference Oscillator
Ref: AM Test Circuit, measureV
FM Front-end Electrical Adjustments
Ref: FM Test Circuit, measure V
FM Mixer
Ref: FM Test Circuit, measure input at V
FM AGC
Ref: FM Test Circuit, measure input at V
R
V
V
R
R
STEP OFF
STEP OFF
RFAGCSTART
ANTADJ
ANTADJ
OUT,FMAGC
IFAGCTART
Symbol
MAX OFF
MAX OFF
CP1
RFADJ
RFADJ
R
IP3
IN,RFAGC
CAdj1
V
IN,IFAGC
V
f
G
C/N
IN,MIX
XTAL
XTAL
OSC
MIX
MIX
MIX
Oscillator Amplitude
Carrier to Noise
Reference Frequency
Oscillator Amplitude
Maximum FM Antenna Filter
Adjustment Voltage Offset
FM Antenna Filter Adjustment
Voltage Offset Step
Maximum FM RF Filter
Adjustment Voltage Offset
FM RF Filter Adjustment Voltage
Offset Step
Single-ended input resistance
(pin 3, pin4)
Conversion Gain
3rd order intermodulation
distortion intercept point
1dB compression point
Value of the minimum adjusting
capacitance step
Open Loop RF AGC Starting
Point
Input Resistance
Open Loop IF AGC Starting
Point
Input Resistance
Output Resistance
Parameter
XTAL
ANTADJ
with high impedance FET probe
and V
MIXFMIN
FMRFAGCIN
RFADJ
, output at V
f
f
1KHz offset
V
ANA3-0 set to 1111
V
ANA3-0 set to 1001
VP
RFA3-0 set to 1111
V
RFA3-0 set to 1001
f
f
f
f
T1A3-0 set to 1000
f
Value of V
V
f
Value of V
V
FAGC2-0 set to 111
OSC
OSC
IN
d
u2
IN
RFAGCIN
IFAGCIN
PLLOUT
PLLOUT
PLLOUT
FMAGCOUT
FMAGCOUT
= 98.1MHz; f
LLOUT
= 98.1MHz
= 98.1MHz
and V
= 98.3MHz;
referred to V
= 108.8MHz, Europe/USA
= 72.3MHz
Test Condition
= 10.7MHz
FMIFAGCIN
= 2.5V,
= 2.5V,
= 2.5V,
= 98.1MHz
= 2.5V,
FMRFAGCIN
FMIFAGCIN
MIXOUT
= 4V
= 4V
u1
PLLOUT
= 98.2MHz;
, output at V
at which
at which
Japan
FMAGCOUT
Min.
2.8
2.8
21
21
10.25
Typ.
21.8
0.38
110
108
108
3.6
3.6
85
25
25
12
90
80
20
77
20
10
Max.
4.4
4.4
27
27
dBc/Hz
dB V
dB V
dB V
dB V
dB V
dB V
Unit
MHz
K
K
K
dB
pF
%
%
%
%