TDA7400 ST Microelectronics, TDA7400 Datasheet - Page 10

• Manufacturer Part Number: TDA7400
• Description: ADVANCED CAR SIGNAL PROCESSOR
• Manufacturer: ST Microelectronics

TDA7400
ELECTRICAL CHARACTERISTICS (continued)
0) All Thresholds are measured using a pulse with T
1) NBT represents the Noiseblanker Byte bits D
2) NAT represents the Noiseblanker Byte bit pair D
3) OVD represents the Noiseblanker Byte bit pair D
4) FSC represents the Fieldstrength Byte bit pair D
5) BLT represents the Speaker RR Byte bit pair D
6) NRD represents the Configuration-Byte bit pair D
7) PCH represents the Stereodecoder-Byte bit D
8) MPNB represents the HighCut-Byte bit D
Figure 1. Trigger Threshold vs.V
10/28
8 STEPS
Symbol
V
ADJMP
65mV
30mV
VTH
MIN. TRIG. THRESHOLD
Noise Rectifier adjustment
through Multipath
0.9V
D97AU636
V IN
DC
Parameter
D97AU648
8)
V OP
7
1.5V
and the Fieldstrength-Byte D
PEAK
NOISE CONTROLLED
TRIG. THRESHOLD
2
T R
, D
5
for the noise rectifier charge-current adjustment
7
4
1
R
, D
0
7
, D
1
, D
, D
, D
=2 s, T
for the noise blanker trigger threshold
6
0
3
6
0
V PEAK(V)
for the blanktime adjustment
Signal PEAK in
Testmode
for the noise controlled triggeradjustment
for the fieldstrength control
T HIGH
for the over deviation detector
for the noise rectifier discharge-adjustment
260mV(00)
220mV(01)
180mV(10)
140mV(11)
HIGH
= 2 s and T
Test Condition
Figure 2. Deviation Controlled Trigger Adjust-
7
V PEAK
for the noise rectifier multipath adjustment
(V
F
OP
= 10 s. The repetition rate must not increase the PEAK voltage.
2.8
2.0
1.2
0.9
MPNB = 00
MPNB = 01
MPNB = 10
MPNB = 11
D97AU649
)
T F
20
ment
8)
8)
8)
8)
32.5
Min.
(c)
(c)
(c)
(c)
45
Time
Typ.
75
0.3
0.5
0.7
0.9
DETECTOR OFF (11)
Max.
(c)
(c)
(c)
(c)
DEVIATION(KHz)
00
01
10
V/ms
V/ms
V/ms
V/ms
Unit