TDA6170 Datasheet, PDF (10/27 Pages) Infineon Technologies AG – Components for Entertainment Electronics, Satellite Sound IF

Data Sheet
TDA6170X
7.3.1 Logic Allocation
Byte
Address Byte
Data
0
1
0
0
0
0 MA R/W
Progr. Divider Byte 1 0
Progr. Divider Byte 2 0
0 N11 N10 N9 N8 N7 N6
0 N5 N4 N3 N2 N1 N0
Control Byte 1
Control Byte 2
1
5I Z2 Z1 Z0 X
X
X
1 VL2 VL1 VL0 VR2 VR1 VR0 X
Control Byte 3
Address Byte 1¹
Address Byte 2²
1 PVL2 PVL1 PVL0 PVR2 PVR1 PVR0 X
0
1
0
0
0
1
0
0
0
1
0
0
0
1
1
0
1. Chip address (CAS) Pin 5 grounded
2. Chip address (CAS) Pin 5 open
7.3.2 IF-Muting
Remarks
A
A
A
A
A
A
A =H44
A =H46
Control Bits
Z2 Z1 Z0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
IF-Source
IF1 IF2 IF3
Function
on on off expanders are working, audio = stereo
off on off expanders are working, audio = mono
on off off expanders are working, audio = mono
off off on de-emphasis = 50µ; audio = mono
off off on de-emphasis = 75µ; audio = mono
off off on de-emphasis = J17; audio = mono
off off off External audio
off off off Mute
7.4 Converter Mixer
In the converter mixer the sound subcarriers (frequency band approx. 5 to 9.9 MHz) contained in the base-
band of the received composite satellite signal are converted to an output frequency of 10.52 MHz and 10.7
MHz for example. The converter consists of a high-pass input filter followed by a double balanced mixer and a
low impedance output.
The signal of the on chip voltage controlled oscillator (VCO) is applied to the PLL input.
7.5 IF Limiter with Demodulator
The two limiter amplifiers are implemented as balanced five stage, capacitively coupled differential amplifiers.
The three inputs are designed as high-pass inputs. The load resistors for the IF filters are connected to
ground.
The output signals of the limiter amplifiers are fed directly to the internal PLL FM demodulators.
The demodulated AF signals are fed to the input of a pre volume control part in front of the expander the de-
emphasis networks and audio switches.
Semiconductor Group
6
21.7.99