Skyworth 8M29B, Service Manual

Page: 27 / 45

IC Block Diagram
-27-
IF signal (differential positive side)
4. Pin Functions
This specification indicates pins and their signals in upper case letters and registers and their signals in lower case
letters
.
Pin Pin name
(Note4)
I/O
(Note5,7)
PU/PD
Function
(Note 3)
s k r a m e R
(Note 2 and 6)
1 TSMD 0 I - Shut down 0: Normal operation 1: Shut down
2 XSEL1 I - Crystal frequency division ratio 1 Set according to crystal frequency.
3 XSEL0 I - Crystal frequency division ratio 0 Set according to crystal frequency.
4 VSS - - Digital GND Connects to DGND.
5 SLADRS1 I/O - Slave address 1 Set according to slave address.
6 SLADRS0 I/O - Slave address 0 Set according to slave address.
7 AGCI I - External AGC input Connects to DGND when not used.
8 S_INFO I - Pin for pre-shipment test Connects to DGND.
9 AGCCNTI I/O PD IF_AGC control output Connects to tuner IF _ AGC control input pin .
1 0 AGCCNTR I/O PD RF_AGC control output
Connects to tuner RF_AGC control input pin.
Open, fixed to L when not used.
11 CKI I - Pin for pre-shipment test Connects to DGND.
12 TNSCL I/O OD I2C clock output
Connects to tuner I2C clock pin.
(Pull-up performed outside IC.)
13 VDDS - - I/O power supply Con nects to d3 . 3 V typ .
14 TNSDA I/O OD I2C data I/O
Connects to tuner I2C data pin.
(Pull-up performed outside IC.)
15 VSS - - Digital GND Connects to DGND.
16 VDDC - - D1.2 V power supply Connects to d1.2 V typ.
17 PLLVSS - - Clock PLL GND Connects to AGND.
18 XO O - Crystal output
Connects to crystal.
ixosl="1" and open when an external reference clock
is input.
19 XI I - Crystal or reference clock input
Connects to crystal .
The amplitude (p-p) is 0.5 V to PLLVDD when an
external reference clock is input .
20 PLLVDD - - Clock PLL power supply Connects to 2.5 V typ.
21
FIL O - PLL filter output Connects to AGND via 15 00 pF .
22 AD_AVDD - - ADC analog power supply Connects to 2.5 V typ.
23 AD_AVSS - - ADC analog GND Connects to AGND.
24 AD_VREFP - - ADC reference voltage output +1.75 V typ. Connects to AGND via PC.
25 AD_VREFN - - ADC reference voltage output +0.75 V typ. Connects to AGND via PC.
26 AD_VREF - - ADC reference voltage output +1.25 V typ. Connects to AGND via PC.
27 ADQ_AIN I -
Q signal (differential negative side)
input
Single-ended IF: Connects to AGND via PC.
Differential IF: Connects to AGND via PC.
Single-ended IQ: Connects to AGND via PC.
Differential IQ: Connects to tuner Q (-) output after
the DC component was cut.
28 ADQ_AIP I -
Q signal (differential positive side)
input
Single-ended IF: Connects to AGND via PC.
Differential IF: Connects to AGND via PC.
Single-ended IQ: Connects to tuner Q output after
the DC component was cut.
Differential IQ: Connects to tuner Q (+) output after
the DC component was cut.
29 ADI_AIN I -
IF signal (differential negative side)
input
or I signal (differential
negative side) input
Single-ended IF: Connects to AGND via PC.
Differential IF: Connects to tuner IF (-) output after
the DC component was cut.
Single-ended IQ: Connects to AGND via PC.
Differential IQ: Connects to tuner I (-) output after the
DC component was cut.
30 ADI_AIP I - input or I signal (differential
positive side) input
Single-ended IF: Connects to tuner IF output after
the DC component was cut.
Differential IF: Connects to tuner IF (+) output after
the DC component was cut.
Single-ended IQ: Connects to tuner I output after the
DC component was cut.
Differential IQ: Connects to tuner I (+) output after the