tda8296 NXP Semiconductors, tda8296 Datasheet - Page 68

• Manufacturer Part Number: tda8296
• Description: Tda8296 Digital Global Standard Low If Demodulator For Analog Tv And Fm Radio
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8296
Product data sheet
13.3 DAC connection
The video and sound output signals are converted from IC internal digital domain to
analog output signal domain by digital controlled current sources. therefore the Digital to
Analog Conversion (DAC) is based on controlled current sources. the current sources of
the video and sound DACs are operating in differential mode. Even though differential
mode can be used, the typical application use case is single ended. Each output of the
differential pair needs to be terminated by the same impedance to ground. The
termination impedance converts the DAC output current to signal voltage. The full scale
DAC current is defined by application resistor R
ground). Typical values of R
current can be adjusted between 50% and 100% via register 0x35h (bits B_DA_V[5:0])
and via register 0x36h (bits B_DA_S[5:0]).
The full scale current is application dependent and needs to be matched to the termination
(output voltage is product of DAC current and termination impedance value). The nominal
peak-peak signal voltage should not exceed 1V
exceed 1.5V single ended.
Fig 27. PCB pattern using circuit diagrams of
(1) Bottom layer
(2) Top layer
16 MHz-p
16 MHz-n
reference from master
Low-IFp
Low-IFn
IF-AGC
SDA-T
SCL-T
Digital global standard low IF demodulator for analog TV and FM radio
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 3 March 2011
100 pF
10 pF
RSET
47
47
220
2.2
2.2
10
are 1 kΩ and 2 kΩ. Additionally the full scale DAC
82
82
470 nF
39 pF
39 pF
TDA8296HN
470 nF
Figure
pp
RSET
. The sum of AC an DC signal should not
470 nF
(2)
(connected between pin RSET and
20,
Figure
100
100
1.0
1.0
2.2 k
2.2
22,
Figure 23
TDA8296
© NXP B.V. 2011. All rights reserved.
(1)
SDA
SCL
SIFp
CVBSp
001aan108
and 16 MHz
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