STW81101AT STMicroelectronics, STW81101AT Datasheet - Page 18

• Manufacturer Part Number: STW81101AT
• Description: IC SYNTHESIZER MULTI RF 28VFQFPN
• Manufacturer: STMicroelectronics
• Type: Frequency Synthesizer (RF)r

Specifications of STW81101AT

• Pll: Yes
• Input: Clock, Crystal
• Output: Clock, Crystal
• Number Of Circuits: 1
• Ratio - Input:output: 3:2
• Differential - Input:output: No/No
• Frequency - Max: 4.4GHz
• 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: 4.4GHz
• Number Of Elements: 1
• Pll Input Freq (min): 10MHz
• Pll Input Freq (max): 200MHz
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: VFQFPN
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature Classification: Industrial
• Pin Count: 28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

General description
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General description
Figure 1: Block diagram on page 6
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 (I
The selection of the digital interface type is done by the proper hardware connection of the
pin DBUS_SEL (0 V for I
All devices operate with a power supply of 3.3 V and can be powered down when not in use.
2
C bus or SPI).
2
C bus, 3.3 V for SPI).
shows the separate blocks that, when integrated, form
STW81101