TDA9853H NXP Semiconductors, TDA9853H Datasheet - Page 7

• Manufacturer Part Number: TDA9853H
• Manufacturer: NXP Semiconductors

Specifications of TDA9853H

• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
FUNCTIONAL DESCRIPTION
Stereo decoder
The composite signal is fed into a pilot detector/pilot
cancellation circuit and into the MPX demodulator. The
main L + R signal passes a 75 s fixed de-emphasis filter
and is fed into the dematrix circuit. The decoded sub-signal
L
circuit. To generate the pilot signal the stereo demodulator
uses a PLL circuit including a ceramic resonator.
Mode selection
The L
dematrix/switching circuit. Mode selection is achieved via
the I
The dematrix outputs can be muted via the I
(see Table 14).
2000 Dec 11
handbook, full pagewidth
I
decoder and audio processor
2
R is applied to the Volume Controlled Amplifier (VCA)
2
C-bus controlled economic BTSC stereo
C-bus (see Table 9).
R signal is fed via the internal VCA circuit to the
COMP
C MO
C SS
R FR
C P2
C P1
LOL
VAL
n.c.
VIL
LIL
10
11
1
2
3
4
5
6
7
8
9
2
C-bus
Fig.2 Pin configuration.
TDA9853H
7
Automatic volume level control
The automatic volume level stage controls its output
voltage to a constant level of typically 200 mV (RMS) from
an input voltage range between 0.1 to 1.1 V (RMS). The
circuit adjusts variations in modulation during broadcasting
and because of changes in the programme material; this
function can be switched off. To avoid audible plops during
the permanent operation of the AVL circuit a soft blending
scheme has been applied between the different gain
stages. A capacitor (4.7 F) at pin C
attack and decay time constants. In addition the ratio of
attack and decay times can be changed via the I
Integrated filters
The filter functions necessary for stereo demodulation are
provided on-chip using transconductor circuits. The filter
frequencies are controlled by the filter reference circuit via
the external resistor R4.
MHB790
33
32
31
30
29
28
27
26
25
24
23
FDO
BPU
C W
TW
C AV
V CAP
V ref
LIR
LOR
VIR
VAR
AV
Product specification
TDA9853H
determines the
2
C-bus.