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TDA8261TW 数据表(PDF) 8 Page - NXP Semiconductors |
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TDA8261TW 数据表(HTML) 8 Page - NXP Semiconductors |
8 / 22 page 2004 Dec 02 8 Philips Semiconductors Product specification Satellite Zero-IF QPSK/8PSK downconverter with PLL synthesizer TDA8261TW PROGRAMMABLE ADDRESS The programmable address bits MA1 and MA0 offer the possibility of having up to four TDA8260TW devices in the same system. The relationship between the voltage applied on pin AS and the value of bits MA1 and MA0 is given in Table 3. Table 3 I2C-bus address selection PROGRAMMABLE MAIN DIVIDER RATIO Program bytes PD1 and PD2 contain the fifteen bits N14 to N0 that set the main divider ratio. The ratio N = N14 × 214 + N13 × 213 +...+ N1 × 2 + N0. OPERATING AND TEST MODES The mode of operation is set using bits T2, T1 and T0 in control byte CD1; see Table 4. Table 4 Mode selection Note 1. Status at power-on: the tuning voltage output is released and pin VT is in the high-impedance mode. REFERENCE DIVIDER Five reference divider ratios allow to adjust the comparison frequency to different values, depending on the compromise which has to be found between step size and phase noise. The reference divider ratios and the corresponding comparison frequencies are programmed using bits R2, R1 and R0, as described in Table 5. Table 5 Reference divider ratio CHARGE PUMP CURRENT Four values of charge pump current can be chosen using bits C1 and C0, according to Table 6. Table 6 Typical charge pump current VAS MA1 MA0 0 to 0.1VCC 00 open-circuit 0 1 0.4VCC to 0.6VCC 10 0.9VCC to VCC 11 T2 T1 T0 TEST MODE XTOUT 0 0 0 normal operation off 0 0 1 POR state = CP sink(1) fXTAL 010 1/2 × fDIV 1/2 × fDIV 0 1 1 CP sink fXTAL 1 0 0 normal operation fXTAL 101 2 × f ref 2 × f ref 1 1 0 CP off fXTAL 1 1 1 CP source fXTAL R2 R1 R0 DIVIDER RATIO COMPARISON FREQUENCY 0 0 0 2 2 MHz 0 0 1 4 1 MHz 0 1 0 8 500 kHz 0 1 1 not allowed not allowed 1 0 0 not allowed not allowed 1 0 1 16 250 kHz 1 1 0 not allowed not allowed 1 1 1 32 125 kHz C1 C0 ICP (ABSOLUTE VALUE) 0 0 420 µA 0 1 900 µA 1 0 1320 µA 1 1 2320 µA |
类似零件编号 - TDA8261TW |
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类似说明 - TDA8261TW |
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