TDA7405 Datasheet, PDF (26/56 Pages) STMicroelectronics – EQUALIZER CARRADIO SIGNAL PROCESSOR

TDA7405
Note 4. ACI ( Adjacent Channel Interference )
α114 = -_V----^V_o---₍-^o-_s--⁽--_ps----_ui-^g---_r-ⁿ-_i--_o-^a---_u-^l--⁾_s--⁽--₎-^a-₍---_at--¹-_t--_4k----^Hk----_H-^z---⁾-_z---₎ ;ƒ_s = 110kH z – (3 ⋅ 38 kHz )
α190 = -_V----^V_o---₍-^o-_s--⁽--_ps----_ui-^g---_r-ⁿ-_i--_o-^a---_u-^l--⁾_s--⁽--₎-^a-₍---_at--¹-_t--_4k----^Hk----_H-^z---⁾-_z---₎ ;ƒ_s = 186kH z – (5 ⋅ 38 kHz )
measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal (f_s = 110kHz or 186kHz, un-
modulated).
NOISE BLANKER PART
Features:
s AM and FM mode
s internal 2nd order 140kHz high-pass filter for MPX path
s internal rectifier and filters for AM-IF path
s programmable trigger thresholds
s trigger threshold dependent on high frequency noise with programmable gain
s additional circuits for deviation- and fieldstrength-dependent trigger adjustment
s 4 selectable pulse suppression times for each mode
s programmable noise rectifier charge/discharge current
Table 4. ELECTRICAL CHARACTERISTICS
All parameters mesured in FM mode if not otherwise specified.
Symbol
Parameter
Test conditions
V_{TR Trigger Threshold} ⁵⁾
meas.with
111
V_PEAK=0.9V
110
101
100
011
010
001
000
V_TRNOISE noise controlled
Trigger Threshold
meas.with
00
V_PEAK=1.5V
01
10
11
Min.
Typ.
30
35
40
45
50
55
60
65
260
220
180
140
Max.
Unit
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
mV_OP
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