Introduction; General Block Diagram And Descriptions; Figure 1.1 Cu1216 General Block Diagram - Philips CU1216 Series Manual

Introduction

This application note describes the use of our common CU/TU1216 NIM (Network Interface Module) evaluation
board that include both the hardware and software requirements.
A general block diagram and description will be provided for better product understanding.

1. General Block Diagram and Descriptions

In general, the CU1216 and TU1216 family is a single conversion full band Network Interface Module (NIM) with
a built- in PLL tuner and a Single Chip DVB-C and DVB-T Channel Decoder respectively.
For details of the model types, please refer to the respective datasheets. This test board can support all models as
mentioned.
Figure 1.1 : CU1216 general block diagram
RF input RF out
Active
Loopthrough
Ant_5 V +5V(LT) RF Mod in
The module consists of the following key features :
1. Loopthrough / RF Modulator input function – Passive loopthrough (LS), Active loopthrough (L) and Active
loopthrough/RF Mod input (LM) versions are available.
2. Tuner – high performance single conversion tuner that covers a frequency range from 51Mhz to 858Mhz.
33V tuning supply is derived from the single 5V supply by means of a DC/DC converter.
3. IF – Provides wideband IF output 36.15Mhz for analog reception. The narrowband IF output after SAW
filtering is being amplified further by a variable IF amplifier. This is controlled by the digital demodulator in
order to maintain a 2Vp-p differential amplified IF output to the DVB-C Receiver.
4. Digital Demodulator -- TDA10021 is used which can support up to 256QAM. The output can be either a
parallel or a serial MPEG-2 transport stream.
Oscillators
A
MOPLL IC
A
A AGC
Detector
A
RF AGC
33V
2
I
A
5V
AGC AS Vt SCL
+5V
4
- -
2
I
PLL
SAW
2
I C BUS
C BUS
SDA IF
BU RF Solutions
ADC
Core
PLL
Demodulation
xtal
2
I C BUS
IF AGC
C BUS
Output Format ter
MP EG_D ATA_ VAL
MP EG (D ... .D7/ SER)
MP EG_T S_CLK
Error
Recovery
MP EG_ PK T_S YNC