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TDA7338D датащи(PDF) 5 Page - STMicroelectronics

номер детали TDA7338D
подробное описание детали  STEREO DECODER
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7338D датащи(HTML) 5 Page - STMicroelectronics

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FUNCTIONAL DESCRIPTION
Signal Path
The TDA7338 Stereodecoder contains all neces-
sary functions for processing the MPX signal. Due
to the external input resistance (Pin 20) the circuit
can be adapted to different MPX input levels. Be-
hind a 80kHz lowpass filter the adjustment free
PLL for the pilot Tone is placed. The only external
component needed for the PLL is the ceramic
resonator for the oscillator which runs at 456kHz.
The pilot detector output is designed as an open
collector output, therefore an external pullup re-
sistor is needed. To force the decoder to ”MONO”
Pin 19 has to be clamped to a voltage below
0.8V.
The voltage level (signal strength from the IF part)
applied to Pin 15 (VHCC) allows to control the
time constant of the deemphasis (nom. = 50
µs,
see fig. 1). If the RF-signal is weak, the corner
NOTES TO THE CHZARACTERISTICS (continued)
4. ACI (ADJACENT CHANNEL INTERFERENCE)
α114 =
VO
(signal)
(at1KHz)
VO
(spurious)(at4KHZ)
;fs = 110KHz - (3 x 38KHz)
α190 =
VO
(signal)
(at1KHz)
VO
(spurious)(at4KHZ)
;fs = 186KHz - (5 x 38KHz)
measured with : 90% mono signal; 9% pilot signal; fm=1KHz; 1% spurious signal
(fs = 110KHz or 186KHz, unmodulated)
5. Control range typ 11% of VR (see figure 1 and figure2)
6. MEASUREMENT OF TRIGGER THRESHOLDS
All thresholds are measured by using a pulse
with TR =2
µs, THIGH =2µs, and TF =10µs.
The repetition rate must not increase the PEAK
voltage.
VTR
Vin
DC
TR
THIGH
TF
Time
D95AU365
-0.5
-0.4
-0.3
-0.2
-0.1
0.0 VHCC-VR(V)
0
1
2
3.18
(=50
µs)
fc
(KHz)
VR=3.6V
D95AU366
Figure 1: High Cut Control
-0.40
-0.32
-0.24
-0.16
-0.08 VSB-VR(V)
0
10
20
30
40
50
SEP
(dB)
VR=3.6V
D95AU367
Figure 2: Stereo Blend
TDA7338
5/11


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