STW82102B datasheet(28/67 Pages) STMICROELECTRONICS

部件名	STW82102B

功能描述	RF down converter with embedded integer-N synthesizer

PDF	67 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

28 / 67 page

General description

STW82102B

28/67

Doc ID 018516 Rev 2

Figure 13.

VCO typical sub-band characteristics

The SERCAL bit should be set to ’1’ at each division ratio change. The calibration takes

approximately 7 periods of the Comparison Frequency and the SERCAL bit is automatically

reset to ’0’ at the end of each calibration.

The maximum allowed FPFD to perform the calibration process is 1 MHz. If a higher FPFD is

used the following procedure should be adopted:

Calibrate the VCO at the desired frequency with an FPFD lower than 1 MHz

Set the A, B and R dividers ratio for the desired FPFD

For calibration details refer to Section 9.4.1: VCO calibration procedure (I2C interface) or

Section 10.4.1: VCO calibration procedure (SPI interface).

00000

00001

01111

11111

Calibrator lock

range

VCTRL (V)

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

STW82102B 数据表(PDF) 28 Page - STMicroelectronics