TDA8295 Datasheet, PDF (44/77 Pages) NXP Semiconductors – Digital global standard low IF demodulator for analog TV and FM radio

NXP Semiconductors
TDA8295
Digital global standard low IF demodulator for analog TV and FM radio
Table 52. ADC_CTL_2 register (address 34h) bit description
Legend: * = default value.
Bit Symbol
Access Value Description
7 to 2 -
R/W -
not used
1
AD_PLL_BYP R/W
The clock PLL can be bypassed for the ADC sampling
clock. Then the crystal output is directly taken for ADC
sampling.
0*
Normal mode
1
Bypass mode
0
AD_SR54M R/W
AD_SR54M sets the ADC sampling rate
0
ADC sampling rate 27 MHz; first decimation filter is
bypassed
1*
ADC sampling rate 54 MHz
9.3.18 Video and sound DAC control
The TDA8295 implements two 10-bit DAC modules (CVBS and sound outputs) which are
sampled by a 108 MHz clock. A reference module derives biasing currents for the two
DACs.
Table 53. VIDEODAC_CTL register (address 35h) bit description
Legend: * = default value.
Bit Symbol
Access Value Description
7
-
R/W 0
reserved, must be set to logic 0
6 to 1 B_DA_V[5:0] R/W
B_DA_V is the coarse output level adjustment
parameters of the video DAC. See Section 13.3.
00 0000 minimum current setting
11 1111* maximum current setting
0
PD_DA_V R/W
When HIGH, PD_DA_V sets the video DAC into its
Power-down mode.
0*
Normal mode
1
video DAC Power-down mode
Table 54. AUDIODAC_CTL register (address 36h) bit description
Legend: * = default value.
Bit Symbol
Access Value Description
7
-
R/W 0
reserved, must be set to logic 0
6 to 1 B_DA_S[5:0] R/W
B_DA_S is the coarse output level adjustment
parameters of the sound DAC. See Section 13.3.
00 0000* minimum current setting
11 1111 maximum current setting
0
PD_DA_S R/W
When HIGH, PD_DA_S sets the sound DAC into its
Power-down mode.
0*
Normal mode
1
sound DAC Power-down mode
TDA8295_1
Product data sheet
Rev. 01 — 4 February 2008
© NXP B.V. 2008. All rights reserved.
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