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STW81101ATR bảng dữ liệu(PDF) 18 Page - STMicroelectronics

tên linh kiện STW81101ATR
Giải thích chi tiết về linh kiện  Multi-band RF frequency synthesizer with integrated VCOs
PDF  48 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STW81101ATR bảng dữ liệu(HTML) 18 Page - STMicroelectronics

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Circuit description
STW81101
18/48
5
Circuit description
5.1
Reference input stage
The reference input stage is shown in
Figure 15. The resistor network feeds a DC bias at the
Fref input while the inverter used as the frequency reference buffer is AC coupled.
Figure 15.
Reference frequency input buffer
5.2
Reference divider
The 10-bit programmable reference counter allows division of the input reference frequency
to produce the input clock to the PFD. The division ratio is programmed through the digital
interface.
5.3
Prescaler
The dual-modulus prescaler P/P+1 takes the CML clock from the VCO buffer and divides it
down to a manageable frequency for the CMOS A and B counters. The modulus P is
programmable and can be set to 16 or 19. The prescaler is based on a synchronous 4/5
core whose division ratio depends on the state of the modulus input.
INV
BUF
VDD
F
ref
Power Down



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