參數資料
型號: TDA8046H
廠商: NXP SEMICONDUCTORS
元件分類: 消費家電
英文描述: Multi-mode QAM demodulator
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP64
文件頁數: 35/48頁
文件大?。?/td> 245K
代理商: TDA8046H
1996 Nov 19
35
Philips Semiconductors
Product specification
Multi-mode QAM demodulator
TDA8046
7.1.13
I
2
C-
BUS READ PARAMETERS
Table 15
I
2
C-bus read parameter; 1-bit values
Table 16
I
2
C-bus read parameter; ADC carrier recovery; 4-bit value
Table 17
I
2
C-bus read parameter; ADC clock recovery; 4-bit value
Table 18
I
2
C-bus read parameter; ADC AGC; 4-bit value
Table 19
I
2
C-bus read parameter; 8-bit value
Note
1.
The bits LE7 to LE0 give the number of symbols falling inside the lock detector active areas. The count is made during
an observation period (256 to 2048 symbols).
To obtain more details about the SER estimation, refer to “Application Note AN96048”
Table 20
I
2
C-bus read parameter; 12-bit value
Note
1.
The bits FS11 to FS0 indicate the remaining frequency shift of the QAM spectrum (IF spectrum). This data is useful
if the TDA8046H does not use the outer loop of carrier recovery (bit ‘OUTE’ of the I
2
C-bus table set to 0).
To obtain more details about the frequency shift calculation, refer to the “Application Note AN96048”
PARAMETER
BIT
VALUE
DESCRIPTION
Lock detect
LK
0
1
0
1
no lock
lock
normal operation (alarm off)
divergence detected (alarm on)
Alarm equalizer
ALEQ
PARAMETER
BITS
DESCRIPTION
ADC carrier
recovery
CR03
b3
CR02
b2
CR01
b1
CR00
b0
carrier recovery: V
CARREC
= 0.25 +
1
16
V
DDD
(8b3 + 4b2 + 2b1 + b0) V
PARAMETER
BITS
DESCRIPTION
ADC clock
recovery
CL03
b3
CL02
b2
CL01
b1
CL00
b0
clock recovery: V
CLKREC
= 0.25 +
1
16
V
DDD
(8b3 + 4b2 + 2b1 + b0) V
PARAMETER
BITS
DESCRIPTION
ADC AGC
AG03
b3
AG02
b2
AG01
b1
AG00
b0
AGC: V
AGC
= 0.25 +
1
16
V
DDD
(8b3 + 4b2 + 2b1 + b0) V
PARAMETER
SER
(1)
BITS
DESCRIPTION
LE7
b7
LE6
b6
LE5
b5
LE4
b4
LE3
b3
LE2
b2
LE1
b1
LE0
b0
SER = f (b7 to b0)
PARAMETER
IF_FREQ_SHIFT
(1)
BITS
DESCRIPTION
FS11 to FS0
frequency shift = f (FS11 to FS0)
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