TDA8296 Datasheet, PDF (68/87 Pages) NXP Semiconductors – Digital global standard low IF demodulator for analog TV and FM radio

NXP Semiconductors
TDA8296
Digital global standard low IF demodulator for analog TV and FM radio
SDA-T
SCL-T
(1)
IF-AGC
Low-IFp
Low-IFn
16 MHz-p
16 MHz-n
47 Ω 82 Ω 39 pF
47 Ω 82 Ω 39 pF
470 nF
2.2 Ω
2.2 Ω 470 nF
10 Ω
100 pF
10 pF 220 Ω
TDA8296HN
(2)
470 nF
100 Ω
100 Ω
2.2 Ω
2.2 kΩ
1.0 Ω
1.0 Ω
SDA
SCL
SIFp
CVBSp
001aan108
(1) Bottom layer
(2) Top layer
Fig 27. PCB pattern using circuit diagrams of Figure 20, Figure 22, Figure 23 and 16 MHz
reference from master
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_RSET (connected between pin RSET and
ground). Typical values of R_RSET are 1 kΩ and 2 kΩ. Additionally the full scale DAC
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_pp. The sum of AC an DC signal should not
exceed 1.5V single ended.
TDA8296
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 3 March 2011
© NXP B.V. 2011. All rights reserved.
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