công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
|
LMX1601 bảng dữ liệu(PDF) 6 Page - National Semiconductor (TI) |
|
|
LMX1601 bảng dữ liệu(HTML) 6 Page - National Semiconductor (TI) |
6 / 14 page 1.0 Functional Description (Continued) the phase detector inputs is less than 15 ns for 4 consecutive comparison cycles. The lock detect output is low when the error between the phase detector outputs is more than 30 ns for one comparison cycle. The lock detect output is always low when the PLL is in power down mode. For further de- scription see Programming Description 2.5. 1.9 POWER CONTROL Each PLL is individually power controlled by the device EN pin. The EN MAIN controls the Main PLL, and the ENAUX con- trols the Aux PLL. Activation of EN = LOW (power down) condition results in the disabling of the respective N and R counters and de-biasing of their respective fin inputs (to a high impedance state). The reference oscillator input block powers down and the OSC IN pin reverts to a high impedance state only when both EN pins are LOW. Power down forces the respective charge pump and phase comparator logic to a TRI-STATE condition as well as disabling the bandgap refer- ence block. Power up occurs immediately when the EN pin is brought high. Power up sequence: Bandgap and Oscillator blocks come up first, with the remaining PLL functions be- coming active approx. 1 µs later. All programming informa- tion is retained internally in the chip when in power down mode. The MICROWIRE control register remains active and capable of loading and latching in data during power down mode. 2.0 Programming Description 2.1 MICROWIRE INTERFACE The descriptions below detail the 18-bit data register loaded through the MICROWIRE Interface. The 18-bit shift register is used to program the 12-bit Main and Aux R counter registers and the 16-bit Main and Aux N counter registers. The shift register con- sists of a 16-bit DATA field and a 2-bit control (CTL [1:0]) field as shown below. The control bits decode the internal register ad- dress. On the rising edge of LE, data stored in the shift register is loaded into one of the 4 appropriate latches (selected by ad- dress bits). Data is shifted in MSB first. MSB LSB DATA [15:0] CTL [1:0] 18 2 1 0 2.1.1 Register Location Truth Table When LE transitions high, data is transferred from the 18-bit shift register into one of the 4 appropriate internal latches depending upon the state of the control (CTL) bits. The control bits decode the internal register address CTL [1:0] DATA Location 0 0 AUX_R Register 0 1 AUX_N Register 1 0 MAIN_R Register 1 1 MAIN_N Register 2.1.2 Register Content Truth Table First Bit SHIFT REGISTER BIT LOCATION Last Bit 17 16 15 14 13 12 11 10 9876543210 AUX_R FoLD AUX_R_CNTR 0 0 AUX_N AUX_B_CNTR AUX_A_CNTR 0 1 MAIN_R CP_WORD MAIN_R_CNTR 1 0 MAIN_N MAIN_B_CNTR and MAIN_A_CNTR 1 1 2.2 PROGRAMMABLE REFERENCE DIVIDERS 2.2.1 AUX_R Register If the Control Bits (CTL [1:0]) are 0 0 when LE transitions high, data is transferred from the 18-bit shift register into a latch which sets the Aux PLL 12-bit R counter divide ratio. The divide ratio is programmed using the bits AUX_R_CNTR as shown in table 2.2.3. The divider ratio must be ≥ 2. The FoLD word bits controls the multifunction FoLD output as described in section in 2.5. First Bit SHIFT REGISTER BIT LOCATION Last Bit 17 16 15 14 13 12 11 10 9876543210 AUX_R FoLD[3:0] AUX_R_CNTR[11:0] 0 0 www.national.com 6 |
Số phần tương tự - LMX1601 |
|
Mô tả tương tự - LMX1601 |
|
|
Link URL |
Chính sách bảo mật |
ALLDATASHEET.VN |
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không? [ DONATE ] |
Alldatasheet là | Quảng cáo | Liên lạc với chúng tôi | Chính sách bảo mật | Trao đổi link | Tìm kiếm theo nhà sản xuất All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |