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LMX2377USLBX bảng dữ liệu(PDF) 4 Page - National Semiconductor (TI) |
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LMX2377USLBX bảng dữ liệu(HTML) 4 Page - National Semiconductor (TI) |
4 / 44 page Pin Descriptions (Continued) Pin Name Pin No. 20-Pin UTCSP Pin No. 24-Pin CSP Pin No. 20-Pin TSSOP I/O Description f IN Main 5 6 6 I Main prescaler complementary input. For single ended operation, this pin should be AC grounded. The LMX2377U Main PLL can be driven differentially when the bypass capacitor is omitted. GND 6 7 7 — Ground for the Main PLL analog circuitry. OSC in 7 8 8 I Reference oscillator input. It has an approximate V CC/2 input threshold and can be driven from an external CMOS or TTL logic gate. GND 8 10 9 — Ground for the Aux PLL digital circuitry, MICROWIRE, F oLD, and oscillator circuits. F oLD 9 11 10 O Programmable multiplexed output pin. Functions as a general purpose CMOS TRI-STATE output, Main/Aux PLL open drain analog lock detect output, N and R divider output or Fastlock output, which connects a parallel resistor to the external loop filter. Clock 10 12 11 I MICROWIRE Clock input. High impedance CMOS input. Data is clocked into the 22-bit shift register on the rising edge of Clock. Data 11 14 12 I MICROWIRE Data input. High impedance CMOS input. Binary serial data. The MSB of Data is shifted in first. The last two bits are the control bits. LE 12 15 13 I MICROWIRE Latch Enable input. High impedance CMOS input. When LE transitions HIGH, Data stored in the shift register is loaded into one of 4 internal control registers. Vµc 13 16 14 — Power supply bias for the MICROWIRE circuitry. Must be ≤ V CC. Typically connected to the same supply level as the microprocessor or baseband controller to enable programming at low voltages. GND 14 17 15 — Ground for the Aux PLL analog circuitry. f IN Aux 15 18 16 I Aux PLL prescaler input. Small signal input from the VCO. GND 16 19 17 — Ground for the Aux PLL digital circuitry, MICROWIRE, F oLD, and oscillator circuits. D o Aux 17 20 18 O Aux PLL charge pump output. the output is connected to an external loop filter, which drives the input of the VCO. V P Aux 18 22 19 — Aux PLL charge pump power supply. Must be ≥ V CC. V CC 19 23 20 — Power supply bias for the Aux PLL analog and digital circuits, F oLD, and oscillator circuits. VCC may range from 2.7V to 5.5V. Bypass capacitors should be placed as close as possible to this pin and be connected directly to the ground plane. NC — 1, 9, 13, 21 — — No Connect www.national.com 4 |
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