STW81101 datasheet(17/48 Pages) STMICROELECTRONICS

Nome de Peças	STW81101

Descrição Electrónicos	Multi-band RF frequency synthesizer with integrated VCOs

PDF	48 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

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17 / 48 page

STW81101

General description

17/48

General description

Figure 1: Block diagram shows the separate blocks that, when integrated, form an Integer-N

PLL frequency synthesizer.

The STW81101 consists of two internal low-noise VCOs with buffer blocks, a divider by 2, a

divider by 4, a low-noise PFD (phase frequency detector), a precise charge pump, a 10-bit

programmable reference divider, two programmable counters and a programmable dual-

modulus prescaler. The 5-bit A-counter and 12-bit B-counter, in conjunction with the dual

modulus prescaler P/P+1 (16/17 or 19/20), implement an N integer divider, where N = B*P

+A. The division ratio of both reference and VCO dividers is controlled through the selected

digital interface (I2C bus or SPI).

The selection of the digital interface type is done by the proper hardware connection of the

pin DBUS_SEL (0 V for I2C bus, 3.3 V for SPI).

All devices operate with a power supply of 3.3 V and can be powered down when not in use.

STW81101 Folha de dados(PDF) 17 Page - STMicroelectronics