tda8295 NXP Semiconductors, tda8295 Datasheet - Page 66

• 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
Fig 13. Hardware reset operation
RST_N
XIN
13.5.1 Hardware reset
13.5.2 Software reset
13.5 Reset operation
13.6 Application hints
After a hardware reset, the registers are set to default (power-on reset values) according
to
A software reset can be done each time something has been programmed. The software
reset does not affect the content of the registers but clears the flip-flops in the design. For
the activation of the software reset see
The TDA8295 has been designed in such a way, that a simple upgrade of the predecessor
TDA8290 is possible:
1. Change the 1.8 V power supply to 1.2 V. This can be done easily with a variable
2. The RSET resistor (R12 in
3. Pin 6 and pin 36 (both internally connected pins) can still stay connected to the 1.2 V
•
•
Table
In case GPIO1 and GPIO2 are configured as I
C = 33 pF to GND must be added at pin 32 (GPIO1/SCL_O). This ensures a reliable
behavior in Read mode.
The detailed application diagram (see
driving a 75
mode: In order to reduce power consumption, the video DAC can be run with half
current and the sound DAC with a quarter current by changing RSET (R12 in
Figure
(> 1 k ). The following components in
R13 = 75 ; R15 and R16 = 150 ; C5 = 220 pF; C6 = 120 pF. A performance
degradation is not expected in the Power-save mode.
voltage regulator, where the sense pin is grounded. This delivers the band gap
voltage of 1.25 V to the output. Or take a fixed regulator.
the DAC output swing higher (1.5 V instead of 1.25 V).
power supply, as done in the PCBs for the predecessor TDA8290 without harm.
However, take grounds for new designs, because they are more easily accessible on
a PCB.
T
XIN
10. M/N standard is the default standard.
12) to 2 k . This is possible, if the audio/video processor is rather high-ohmic
immediately in its reset mode
Digital global standard low IF demodulator for analog TV and FM radio
the TDA8295 enters
DC load and the sound DAC driving > 1 k AC/DC load. Power-save
Rev. 01 — 4 February 2008
minimum width at LOW is 4
Figure
12) has to be decreased by 20 % in order to make
Table 49
Figure
Figure 12
T
XIN
bit CLB.
12) shows the video DAC connection
2
C-bus feed-through, a capacitor
have to be replaced then:
starts after 4 falling edges of XIN
TDA8295 normal operation
TDA8295
© NXP B.V. 2008. All rights reserved.
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