tda8295 NXP Semiconductors, tda8295 Datasheet - Page 41

• Manufacturer Part Number: tda8295
• Description: Tda8295 Digital Global Standard Low If Demodulator For Analog Tv And Fm Radio
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8295_1
Product data sheet
9.3.14 Debug register for ADC and DAC test
9.3.15 Chip identification and Standby mode
Table 45.
Table 46.
Table 47.
Legend: * = default value.
Table 48.
Bit
7 to 0 D_IF_AGC_STAT[7:0] R
Bit
7 to 0 T_IF_AGC_STAT[7:0]
Bit
7 to 2 -
1
0
Bit
7 to 0 IDENTITY[7:0] R
Symbol
Symbol
Symbol
ADC_TEST R/W
DAC_TEST R/W
Symbol
D_IF_AGC_STAT register (address 27h) bit description
T_IF_AGC_STAT register (address 28h) bit description
ANALOG_DEBUG register (address 2Ah) bit description
IDENTITY register (address 2Fh) bit description
Digital global standard low IF demodulator for analog TV and FM radio
Access Value
R/W
Access Value
Rev. 01 — 4 February 2008
-
0*
1
0*
1
X
Access Value
Access Value
R
1000 1010 chip identification, value corresponds to TDA8295
Description
not used
If ADC_TEST is HIGH, the ADC input signal is interpolated
to 108 MHz and fed to video and sound DAC output; the
main circuitry is bypassed. This feature is intended mainly
for debugging purposes and performance judgment.
DAC Test mode; in this test mode an internally generated
sine wave is given out to video and sound DAC. The
amplitude at DAC output is 1.7 dBFS. The frequency can
be set by DTO_PC. Please use the following formula:
only frequencies up to 6.75 MHz can be generated. This
feature is intended mainly for debugging purposes and
performance judgment.
f
Normal mode
ADC Test mode
Normal mode
DAC Test mode
don’t care if ADC_TEST = 1
-
-
=
DTO_PC
--------------------- -
Description
2
24
Description
D_IF_AGC_STAT is the digital IF AGC status
readout byte. Contains the digital IF AGC loop
DC information. The format is twos
complement. To get the internal gain in dB, the
following formula can be used:
Description
T_IF_AGC_STAT is the IF AGC status readout
byte. Contains the tuner IF AGC loop DC
information. The format is offset binary.
gain
13.5 MHz
=
D_IF_AGC_STAT
------------------------------------------------------- - (dB)
. Due to the sampling theorem
3.675
+
TDA8295
50
© NXP B.V. 2008. All rights reserved.
.
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