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TDA6650TT Datasheet(PDF) 9 Page - NXP Semiconductors |
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TDA6650TT Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 54 page TDA6650TT_6651TT_5 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 05 — 10 January 2007 9 of 54 NXP Semiconductors TDA6650TT; TDA6651TT 5 V mixer/oscillator and low noise PLL synthesizer [1] MSB is transmitted first. Fig 4. Example of I2C-bus transmission frame ADDRESS BYTE DIVIDER BYTE 1 START ADDRESS BYTE I2C-bus transmission dedicated to another IC I2C-bus transmission dedicated to the MOPLL START 50 µs DIVIDER BYTE 2 CONTROL BYTE 1 CONTROL BYTE 2 CONTROL BYTE 1 CONTROL BYTE 2 STOP fce921 Table 6. I2C-bus write data format Name Byte Bit Ack MSB[1] LSB Address byte 111000MA1 MA0 R/W=0 A Divider byte 1 (DB1) 2 0 N14 N13 N12 N11 N10 N9 N8 A Divider byte 2 (DB2) 3 N7 N6 N5 N4 N3 N2 N1 N0 A Control byte 1 (CB1); see Table 7 4 1 T/A = 1 T2 T1 T0 R2 R1 R0 A 1 T/A = 0 0 0 ATC AL2 AL1 AL0 A Control byte 2 (CB2) 5 CP2 CP1 CP0 BS5 BS4 BS3 BS2 BS1 A Table 7. Description of write data format bits Bit Description A acknowledge MA1 and MA0 programmable address bits; see Table 8 R/W logic 0 for write mode N14 to N0 programmable LO frequency; N = N14 × 214 + N13 × 213 + N12 × 212 +...+N1 × 21 +N0 T/A test/AGC bit T/A = 0: the next 6 bits sent are AGC settings T/A = 1: the next 6 bits sent are test and reference divider ratio settings T2, T1 and T0 test bits; see Table 9 R2, R1 and R0 reference divider ratio and programmable frequency step; see Table 10 ATC AGC current setting and time constant; capacitor on pin AGC = 150 nF ATC = 0: AGC current = 220 nA; AGC time constant=2s ATC = 1: AGC current = 9 µA; AGC time constant = 50 ms AL2, AL1 and AL0 AGC take-over point bits; see Table 11 CP2, CP1 and CP0 charge pump current; see Table 12 BS5, BS4, BS3, BS2 and BS1 PMOS ports control bits BSn = 0: corresponding port is off, high-impedance state (status at power-on reset) BSn = 1: corresponding port is on; VO =VCC − VDS(sat) |
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