tda7421n STMicroelectronics, tda7421n Datasheet - Page 14

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

TDA7421N
ELECTRICAL CHARACTERISTICS (Continued)
14/38
AM Field Strength Meter and Field Strength Station Detector
Ref: AM Test Circuit; f
position 2).
IF Counter Output
Ref: AM & FM Test Circuit, measure at pin 28
SD output Impedance
Measure output at V
Loop Filter Input/Output
(LP_IN1, LP_IN2, LP_IN3, LP_OUT)
AMSD
IF
AMSD
IFC
SD
SD
Symbol
AMSM1
AMSM2
AMSM3
IF
IFC
AMSTcurr
IFC
I
I
V
V
AMST
-I
OUT
OUT
IMP,ON
IMP,TS
I
current
IN
OH
OL
IN
AM
FM
MAX
MIN
AM IF2 Output Level at pin 28
Current Capability of pin 28
AM Smeter 1 at V
AM Smeter 2 at V
AM Smeter 3 at V
Station Detector Minimum
Threshold
Station Detector Maximum
Threshold
FM IFC Sensitivity
AM IFC Sensitivity
IFC Current Capability
SD output impedance
SD output impedance (Tri-State) SDDIS set to 1
Input Leakage Current
Input Leakage Current
Output Voltage Low
Output Voltage High
Output Current Sink
Output Current Source
FMSD
IN
= 10.7MHz, measure input at V
Parameter
AMSMETER
AMSMETER
AMSMETER
VI
AMSTEREO set to 1
AMSTEREO set to 1
V
V
V
V
ASS3-0 set to 0000, SEEK set to 1
V
ASS3-0 set to 1111, SEEK set to 1
V
2.5V, SEEK set to 1, EW2-0 set
to 101, IFS2-0 set to 010
V
2.5V, SEEK set to 1, EW2-0 set
to 011, IF2-0 set to 100, AMFM
STBY1-0 set to 10
SDDIS set to 0
V
V
I
I
V
V
IN
OUT
out
MIX2AMIN
MIX2AMIN
MIX2AMIN
MIX2AMIN
MIX2AMIN
FMLIMIN
IF2AMPIN
IN
IN
PLL
F2AMPIN
= -0.2mA; V
= GND; PD
= V
= 0.5 to 8V
= 0.2mA; V
= 8.5V;
MIX2AMIN
DD
Test Condition
at which Vpin 28 =
; PD
at which V
at which V
at which Vpin 28 =
= 72dBmV;
= 40dB V
= 60dB V
= 80dB V
out
CC
out
, outputs at V
CC
= Tristate
= 8.5V
= Tristate
= 8.5V
AMSD
AMSD
= 2.5V;
= 2.5V;
AMSMETER
Min.
10
10
-2
-2
7
8
and at V
Typ.
106
150
150
1.4
3.4
4.8
27
34
29
0
0
AMSD
Max.
(switches in
700
0.5
2
2
dB V
dB V
dB V
dB V
dB V
Unit
M
mA
mA
V
V
V
V
V
A
A
A
A