TDA7338 Datasheet, PDF (4/11 Pages) STMicroelectronics – STEREO DECODER

TDA7338
ELECTRICAL CHARACTERISTICS (continued)
HIGH CUT CONTROL
Symbol
τ_deemp
R_{15 -17}
R_{15 -17}
VCO
Parameter
De-Emphasis Time Constant
High Cut Control Resistance
High Cut Control Resistance
Test Condition
C₁₃, C₁₄ = 1nF; V_15-17 = 50mV
V15 - 17 = 50mV
V15 - 17 = -0.5V (note 5)
f_osc
Oscillator Frequency
with Murata CSB456F11
∆f/f
Capture and Holding Range
V_VCO
VCO OFF
Pin 7
NOISE INTERFACE DETECTOR (test condition: V_SB > V_R + 50mV)
V_TR
Trigger Threshold (note 6)
V_TR
Trigger Threshold
T_S
Suppression Pulse Duration
I_OS
Input Offset Current during
suppression time
V_N1
V_PEAK (pin 8)
V_N2
V_PEAK (pin 8)
V_N3
V_PEAK (pin 8)
V_PEAK = 1.3V; PROG = GND
V_PEAK = 1.3V;
PROG = OPEN/V_DD
V_PEAK = 1.5V; PROG = GND
VPEAK = 1.5V;
PROG = OPEN/V_DD
CBLANK = 470pF
V_IN = 0mV_RMS
V_IN = 50mV_RMS; f = 150KHz
V_IN = 100mV_RMS; f = 150KHz
Min. Typ. Max. Unit
43
50
57
µs
43
50
57
KΩ
115 150 185 KΩ
456
KHz
±1
%
0.6
V
180
mV
250
mV
260
mV
340
mV
50
µs
10
pA
0.7
1.0
1.3
V
1.1
1.5
2
V
1.7
2.3
2.8
V
NOTES TO THE CHARACTERISTICS
1 INTERMODULATION SUPPRESSION
α2
=
VO (signal) (at1KHz)
V_O (spurious) (at1KHZ)
;
fs
=
(2
x
10KHz)
-
19KHz
α3
=
V_O (signal) (at1KHz)
V_O (spurious) (at1KHZ)
;
fs
=
(3
x
13KHz)
-
38KHz
measured with : 91% mono signal; 9% pilot signal; fm=10KHz or 13KHz
2. TRAFFIC RADIO (V.F.) suppression
α57 (V.W.F.) = _VO
VO(signal) (at1KHz)
(spurious) (at1KHZ ±23Hz)
measured with : 91% stereo signal; 9% pilot signal; fm=1KHz; 5% subcarrier
(f=57KHz, fm = 23Hz AM, m = 60%)
3. SCA (SUBSIDIARY COMMUNICATIONS AUTHORIZATION)
α67
=
VO(signa)l (at1KHz)
V_O (spurious) (at9KHZ)
;
f_s
=
(2
x
38KHz)
-
67KHz
measured with : 81% mono signal; 9% pilot signal; fm=1KHz;
10% SCA - subcarrier (fs = 67KHz, unmodulated)
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