TDA8046 Datasheet, PDF (35/48 Pages) NXP Semiconductors – Multi-mode QAM demodulator

Philips Semiconductors
Multi-mode QAM demodulator
Product specification
TDA8046
7.1.13 I²C-BUS READ PARAMETERS
Table 15 I²C-bus read parameter; 1-bit values
PARAMETER
Lock detect
Alarm equalizer
BIT
LK
ALEQ
VALUE
0
1
0
1
DESCRIPTION
no lock
lock
normal operation (alarm off)
divergence detected (alarm on)
Table 16 I²C-bus read parameter; ADC carrier recovery; 4-bit value
PARAMETER
ADC carrier
recovery
CR03
b3
BITS
CR02 CR01
b2
b1
CR00
b0
DESCRIPTION
carrier recovery: V_CARREC = 0.25 + ¹â„₁₆V_DDD
(8b3 + 4b2 + 2b1 + b0) V
Table 17 I²C-bus read parameter; ADC clock recovery; 4-bit value
PARAMETER
ADC clock
recovery
CL03
b3
BITS
CL02 CL01
b2
b1
CL00
b0
DESCRIPTION
clock recovery: V_CLKREC = 0.25 + ¹â„₁₆V_DDD
(8b3 + 4b2 + 2b1 + b0) V
Table 18 I²C-bus read parameter; ADC AGC; 4-bit value
PARAMETER
ADC AGC
AG03
b3
BITS
AG02 AG01
b2
b1
AG00
b0
DESCRIPTION
AGC: V_AGC = 0.25 + ¹â„₁₆V_DDD (8b3 + 4b2 + 2b1 + b0) V
Table 19 I²C-bus read parameter; 8-bit value
PARAMETER
SER ⁽¹⁾
BITS
DESCRIPTION
LE7 LE6 LE5 LE4 LE3 LE2 LE1 LE0
b7 b6 b5 b4 b3 b2 b1 b0 SER = f (b7 to b0)
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 I²C-bus read parameter; 12-bit value
PARAMETER
IF_FREQ_SHIFT⁽¹⁾
BITS
FS11 to FS0
DESCRIPTION
frequency shift = f (FS11 to FS0)
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 I²C-bus table set to 0).
To obtain more details about the frequency shift calculation, refer to the “Application Note AN96048”.
1996 Nov 19
35