STW81102ATR STMicroelectronics, STW81102ATR Datasheet - Page 36

• Manufacturer Part Number: STW81102ATR
• Description: IC SYNTHESIZER MULTI RF 28VFQFPN
• Manufacturer: STMicroelectronics
• Type: Frequency Synthesizerr

Specifications of STW81102ATR

• Pll: Yes
• Input: Clock, Crystal
• Output: Clock, Crystal
• Number Of Circuits: 1
• Ratio - Input:output: 3:2
• Differential - Input:output: No/No
• Frequency - Max: 4.65GHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-VFQFN, 28-VFQFPN
• Frequency-max: 4.65GHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SPI digital interface
7
7.1
Figure 26. SPI input and output bit order
36/53
DATA
LOAD
Last bit sent
(LSB)0
SPI digital interface
General features
The SPI digital interface is selected by hardware connection of the pin #21 (DBUS_SEL) to
3.3 V.
The STW81102 IC is programmed by means of a high-speed serial-to-parallel interface with
write option only. The 3-wire bus can be clocked at a frequency as high as 100 MHz to allow
fast programming of the registers containing the data for RF IC configuration.
The chip is programmed through serial words with a full length of 26 bits. The first 2 MSBs
represent the address of the registers, and the 24 LSBs represent the value of the registers.
Each data bit is stored in the internal shift register on the rising edge of the CLOCK signal.
The outputs of the selected register are sent to the device on the rising edge of the LOAD
signal.
1
2
Reg.#0
Reg.#1
23
D23 (MSB)
D0 (LSB)
24
Address
decoder
25(MSB)
A1
Reg.#4
STW81102
LOAD #4