TDA8296 datasheet(69/87 Pages) NXP

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TDA8296

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Product data sheet

Rev. 1 — 3 March 2011

69 of 87

NXP Semiconductors

TDA8296

Digital global standard low IF demodulator for analog TV and FM radio

The following relation gives the value of the full-scale current IFS in function of the bias

resistance value and value of B_DA_V[5:0] (part of register 0x35h) and value of

B_DA_S[5:0] (part of register 0x36h) (B_DA_V or B_DA_S):

(2)

≤ B_DA_V/S ≤ 63

For programming of B_DA_V see Table 50, for B_DA_S see Table 51.

The DAC signal range used for CVBS and sound signal is reduced to provide headroom.

The signal headroom is shown in Figure 29 and Figure 30. The full scale DAC current

corresponds to digital input value of 1034. For the pins VIOUT_P and SIOUT_P the

corresponding signal shapes of CVBS and sound signal can be mapped linear to the full

scale DAC current. For the CVBS signal the sync level is fixed, the white level depends

also on register value CVBS_LVL[7:0]. For the sound signal the DC level is fixed.

(1) IV_IOUTP for RRSET = 1 kΩ

(2) IV_IOUTP for RRSET = 1.5 kΩ

(3) IV_IOUTP for RRSET = 2 kΩ

Fig 28. TDA8296 calculated DAC characteristic

1.216 V

RSET

------------------------------

---

B_DA_V/S

--------------------------------------

DAC reg (dec)

030

001aam357

DAC current

[mA]

(1)

(2)

(3)

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