SKY72300-21 Skyworks Solutions Inc, SKY72300-21 Datasheet - Page 10

• Manufacturer Part Number: SKY72300-21
• Description: IC SYNTHESIZER 2.1GHZ 28-EPTSSOP
• Manufacturer: Skyworks Solutions Inc
• Type: Fractional N Synthesizerr

Specifications of SKY72300-21

• Pll: Yes
• Input: Clock, Crystal
• Output: Clock, Crystal
• Number Of Circuits: 1
• Ratio - Input:output: 2:2
• Differential - Input:output: Yes/Yes
• Frequency - Max: 2.1GHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 2.7 V ~ 3.3 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP Exposed Pad, 28-eTSSOP, 28-HTSSOP
• Frequency-max: 2.1GHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 863-1076-2

DATA SHEET • SKY72300-21 FREQUENCY SYNTHESIZER
General Synthesizer Registers
The dual-programmable reference frequency dividers provide the
reference frequencies to the phase detectors by dividing the
crystal oscillator frequency. The lower five bits hold the reference
frequency divide index for the main phase detector. The next five
bits hold the reference frequency divide index for the auxiliary
phase detector. Divide ratios from 1 to 32 are possible for each
reference frequency divider (see Tables 2 and 3).
The Reference Frequency Dividers Register configures the dual-
programmable reference frequency dividers for the main and
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
September 11, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 101217N
A3
A3
A3
0
0
0
A2
A2
A2
0
0
0
A1
A1
A1
0
1
0
A0
A0
A0
1
0
0
11
11
11
X
X
X
10
10
10
X MSB
X
X
Figure 7. Main Dividend MSB Register (Write Only)
Figure 8. Main Dividend LSB Register (Write Only)
9
9
X
9
Figure 6. Main Divider Register (Write Only)
X MSB
8
8
X
8
MSB
7
7
7
6
6
6
5
5
5
4
4
4
auxiliary synthesizers. As shown in Figure 11, the values to be
loaded are:
3
3
Main Reference Frequency Divider Index = Desired main
oscillator frequency division ratio –1. Default value on power up
is 0, signifying that the reference frequency is not divided for
the main phase detector.
Auxiliary Reference Frequency Divider Index = Desired auxiliary
oscillator frequency division ratio –1. Default value on power up
is 0, signifying that the reference frequency is not divided for
the auxiliary phase detector.
3
2
2
2
1
1
1
LSB
LSB
0
0
LSB
0
Main Synthesizer Dividend (MSBs)
Main Synthesizer Dividend (LSBs)
Main Synthesizer Divider Index
C1419
C1417
C1418