SKY72301-22 Skyworks Solutions Inc, SKY72301-22 Datasheet - Page 14

• Manufacturer Part Number: SKY72301-22
• Description: IC SYNTHESIZER 1GHZ 28-EPTSSOP
• Manufacturer: Skyworks Solutions Inc
• Type: Fractional N Synthesizerr

Specifications of SKY72301-22

• Pll: Yes
• Input: Clock, Crystal
• Output: Clock, Crystal
• Number Of Circuits: 1
• Ratio - Input:output: 2:2
• Differential - Input:output: Yes/Yes
• Frequency - Max: 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: 1GHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 863-1078-2

DATA SHEET • SKY72301-22 FREQUENCY SYNTHESIZER
The Modulation Control Register is used to configure the
modulation unit of the main synthesizer. The modulation unit adds
or subtracts a frequency offset to the selected center frequency at
which the main synthesizer operates. The size of the modulation
data sample, controlled by the duration of the CS signal, can be
from 2 to 12 bits wide, to provide from 4 to 4096 selectable
frequency offset steps.
The modulation data magnitude offset selects the magnitude
multiplier for the modulation data and can be from 0 to 8. As
shown in Figure 14, the values to be loaded are:
14
Modulation Data Magnitude Offset = Four-bit value that
indicates the magnitude multiplier (m) for the modulation data
samples. Valid values range from 0 to 13, effectively providing a
2
Modulation Data Input Select = One-bit flag to indicate the pin
on which modulation data samples are serially input when the
CS signal is between 2 and 12 bits long. When this bit is
cleared, modulation data samples are to be presented on the
Data pin. When this bit is set, modulation data samples are to
be presented on the Mod_in pin.
Modulation Address Disable = One-bit flag to indicate the
presence of the address as modulation data samples are
presented on either the Mod_in or Data pins. When this bit is
cleared, the address is presented with the modulation data
samples (i.e., all transfers are 16 bits long). When this bit is set,
m
multiplication of the modulation data sample.
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 • 200706C
A3 A2 A1
A3 A2 A1
1
1
0
0
0
0
A0 11
0
A0 11
1
X
MSB
10
X
Figure 14. Modulation Control Register (Write Only)
10
Figure 15. Modulation Data Register (Write Only)
9
9
8
8
7
6
7
5
6
4
5
3
0
The Modulation Data Register is used to load the modulation data
samples to the modulation unit. These values are transferred to
the modulation unit on the falling edge of F
passed to the main
offset on the next falling edge of F
values are 2's complement format. As shown in Figure 15, the
value to be loaded is:
Package and Handling Information
Since the device package is sensitive to moisture absorption, it is
baked and vacuum packed before shipping. Instructions on the
shipping container label regarding exposure to moisture after the
container seal is broken must be followed. Otherwise, problems
related to moisture absorption may occur when the part is
subjected to high temperature during solder assembly.
The SKY72301-22 is rated to Moisture Sensitivity Level 3 (MSL3)
at 260 C. It can be used for lead or lead-free soldering.
4
no address is presented with the modulation data samples (i.e.,
all transfers are 2 to 12 bits long).
Modulation Data Bits = Modulation data samples that represent
the desired instantaneous frequency offset to the selected main
synthesizer frequency (selected channel) before being affected
by the modulation data magnitude offset.
2
0
3
1
0
2
0
0
1
Reserved Bits
Modulation Data Magnitude Offset
Modulation Data Input Select
Modulation Address Disable
LSB
0
modulator at the selected magnitude
Modulation Data Bits
pd_main
. Modulation Data register
pd_main
C1426
C1425
where they are