TDA7338_05 Datasheet, PDF (4/12 Pages) STMicroelectronics – STEREO DECODER

TDA7338
Table 4.
(V_CC = 9V; modulation frequency: 1KHz; de-emphasis time: T = 50µs; nominal MPX input voltage:
V_MPX = 1.5V_PP; m 100% (75KHz deviation, f_mod = 1KHz); R_IN = 40.2kΩ, R_OUT = 40.2kΩ;
T_amb = 27°C; C_REF = 4.7µF; unless otherwise specified)
STEREO BLEND
V_16-17
Control Voltage for Channel
Separation
α = 6dB; V_R = 3.6V (note 5)
-0.31 -0.27 -0.23
V
V_16-17
Control Voltage for Channel
Separation
α = 26dB;
-85
-55
-30
mV
HIGH CUT CONTROL
τ_deemp De-Emphasis Time Constant
C₁₃, C₁₄ = 1nF; V_15-17 = 50mV
43
50
57
µs
R_15-17 High Cut Control Resistance
V_{15 - 17} = 50mV
43
50
57
KΩ
R_15-17 High Cut Control Resistance
V_{15 - 17} = -0.5V (note 5)
115 150 185
KΩ
VCO
f_osc
Oscillator Frequency
with Murata CSB456F11
456
KHz
∆f/f
Capture and Holding Range
±1
%
V_VCO
V_{CO OFF}
Pin 7
0.6
V
NOISE INTERFACE DETECTOR (test condition: V_SB > V_R + 50mV)
V_TR
Trigger Threshold (note 6)
V_PEAK = 1.3V; PROG = GND
180
mV
V_PEAK = 1.3V;
PROG = OPEN/V_DD
250
mV
V_TR
Trigger Threshold
V_PEAK = 1.5V; PROG = GND
260
mV
V_PEAK = 1.5V;
PROG = OPEN/V_DD
340
mV
T_S
Suppression Pulse Duration
C_BLANK = 470pF
50
µs
I_OS
Input Offset Current during
suppression time
10
pA
V_N1
V_PEAK (pin 8)
V_IN = 0mV_RMS
0.7
1.0
1.3
V
V_N2
V_PEAK (pin 8)
V_IN = 50mV_RMS; f = 150KHz
1.1
1.5
2
V
V_N3
V_PEAK (pin 8)
V_IN = 100mV_RMS; f = 150KHz
1.7
2.3
2.8
V
3.1 NOTES TO THE CHARACTERISTICS
1) INTERMODULATION SUPPRESSION
α2
=
----^V-----^O----⁽--^s----ⁱ--^g---ⁿ----^a----^l--⁾--⁽---^a---^t--¹----^K-----^H-----^z---⁾----
V_O(spurious)(at1KHz)
; f_s = (2 x 10KHz) - 19KHz
α3
=
----^V-----^O----⁽--^s----ⁱ--^g---ⁿ----^a----^l--⁾--⁽---^a---^t--¹----^K-----^H-----^z---⁾----
V_O(spurious)(at1KHz)
; f_s = (3 x 13KHz) - 38KHz
measured with : 91% mono signal; 9% pilot signal; fm=10KHz or 13KHz
2) TRAFFIC RADIO (V.F.) suppression
α 57 ( V .W.F. )
=
-----------------^V-----^O----⁽--^s----ⁱ-^g----ⁿ----^a----^l--⁾--⁽--^a----^t--¹----^K-----^H----^z----⁾-----------------
V_O(spurious)(at1KHz ± 23KHz)
measured with : 91% stereo signal; 9% pilot signal; fm=1KHz; 5% subcarrier
(f = 57KHz, fm = 23Hz AM, m = 60%)
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