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STA002 Datasheet PDF - ST Microelectronics

Part Number STA002
Description STARMANO CHANNEL DECODER
Manufacturers ST Microelectronics 
Logo ST Microelectronics Logo 

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® STA002
STARMANCHANNEL DECODER
FRONT_END INTERFACE:
IF input carrier frequency: f = 1.84 MHz
Single internal 6 bit A/D converter
QPSK demodulation
Input symbol frequency: Fs = 1.84 Msymbols/s
Digital Nyquist root filter:
- roll-off value of 0.4
Digital carrier loop:
- on-chip quadrature demodulator and tracking
loop
- lock detector
- C/N indicator
Digital timing recovery:
- internal timing error evaluation, filter and
correction
Digital AGC:
- internal signal power estimation and filter
- output control signal for AGC (1 bit PWM)
FORWARD ERROR CORRECTION:
Inner decoder:
- Viterbi soft decoder for convolutional codes,
constraint length M=7, Rate 1/2
Deinterleaver block
Outer decoder:
- Reed-Solomon decoder for 32 parity bytes;
correction of up to 16 byte errors
- Block lengths: 255
- Energy dispersal descrambler
BACK_END INTERFACE:
Broadcast Channel selection
Audio Service Component selection to MPEG
decoder
Service Component selection
CONTROL:
I2C serial Bus control interface
TQFP44
DECRYPTION:
WES scheme supported
DESCRIPTION
Designed for World Space satellites digital audio
receivers, the STA002 Digital Receiver Front-end
integrates all the blocks needed to demodulate
incoming digital satellite audio signals from the
tuner: analog to digital converter, QPSK demodu-
lator, signal power estimator, automatic gain con-
trol, Viterbi decoder, deinterleaver, Reed-Solo-
mon decoder and energy dispersal descrabler. Its
advanced error correction functions guarantees a
low error rate even with small low gain receiver
antennas.
Additional functions include the selection of
broadcast channel, service components and
audio components for source decoding:
- The MPEG Audio bitstream is provided at the
serial audio output port.
- The Broadcast Channel is provided to the serial
data output port.
- The Service Component is provided at the SC
output interface.
World Space encryption scheme is supported for
pay programs and paging.
www.DataSheet4U.com
January 2002
1/43
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STA002 equivalent
Fig. 3: Test Circuit
STA002
VDD
100nF
VDD
100nF
VDD
100nF
VDD
100nF
VDD
100nF
VDD
100nF
AVDD
TEST1
RXI
NRXI
M_CLK
TEST_CLK
TEST2
3
8
14
17
21
19
26
30
38
35
40
42
4
7
1
5
6
9
10
11
44
34
33
32
25
23
22
20
16
15
12
200
43
200
41
200
39
200
37
200
36
200
31
200
29
200
28
200
27
200
24
200
18
200
2
200
13
TEST9
TEST8
TEST7
BCDIN
TEST6
TEST5
TEST4
RESET
SCL
SDA
TEST3
SCDI
SCCK
SEN
BCDO
BCCK
BCSYNC
SDI
SCK
SEN
MINTR
INTR
AGC
LOCK
VDD
4.7µF
100nF
VSS
4.7µF
100nF
VSS
100nF
100nF
100nF
VSS
AVDD
4.7µF 100nF
AVSS
4.7µF
100nF
AVSS
100nF
100nF
100nF
AVSS
D99AU1011
Figure 4. Test Load Circuit
VDD
IOL
OUTPUT
CL
IOH
VREF
D98AU967
Test Load
Output
SDA
Other Outputs
IOL
5mA
100µA
IOH
100µA
CL
100pF
100pF
VREF
3.6V
1.5V
5/43


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