STW81101AT STMicroelectronics, STW81101AT Datasheet - Page 33

• 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

STW81101
B_COUNTER
B[10:3]. B counter value (bit B11 in the previous register, bits B[2:0] in the next register)
A_COUNTER
Bits B[2:0] for B_COUNTER, A_COUNTER value.
REF_DIVIDER
Reference clock divider ratio R[9:1] (bits R1, R0 in the next register).
CONTROL
The CONTROL register is used to set the charge pump current, the VCO output voltage
amplitude and the prescaler modulus:
PLL_A[1:0]:
CPSEL[2:0]:
PSC_SEL:
The LO output frequency is programmed by setting the proper values for A, B and R
according to the following formula:
where
F
OUT
MSB
MSB
MSB
MSB
B10
R9
R1
B2
b7
b7
b7
b7
D
=
R
D
R
equals
VCO amplitude
×
charge pump output current
prescaler modulus select ('0' for P=16, '1' for P=19)
(
B
R8
R0
B9
B1
b6
b6
b6
b6
×
P
+
{
A
)
PLL_A1
×
R7
b5
b5
B8
B0
b5
b5
F REF CLK
---------------------------------- -
1
0.5
0.25 for output divided by 4
R
–
for direct output
for output divided by 2
PLL_A0
B7
R6
b4
A4
b4
b4
b4
CPSEL2
b3
R5
b3
B6
A3
b3
b3
CPSEL1
b2
B5
R4
b2
A2
b2
b2
CPSEL0
b1
B4
R3
b1
b1
A1
b1
I
2
C bus interface
PSC_SEL
LSB
LSB
LSB
LSB
B3
A0
R2
b0
b0
b0
b0
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