sky73112-11 Skyworks Solutions, Inc., sky73112-11 Datasheet - Page 7

• Manufacturer Part Number: sky73112-11
• Description: Sky73112-11 750-850 Mhz High Performance Vco/synthesizer With Integrated Switch
• Manufacturer: Skyworks Solutions, Inc.

Table 6. Load Register Word 2 (Programs the Frequency Control 1 Register) (2 of 2)
Table 7. Load Register Word 3 (Programs the Frequency Control 2 Register)
ndiv
rsvd
mod_reset_f
fract_int_sel
rsvd
me
rsvd
wd_0, wd_1
me
fn
rsvd
rsvd
Parameter
Parameter
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200736B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • November 30, 2009
N-divider/prescaler mode for control of M
and A counters [15:6]
Reserved [16]
Modulator reset/fractional mode select [17]
Fractional/integer mode select [18]
Reserved [19]
Modulus extender [23:20]
Reserved [25:24]
Address bits [1:0]. Must be set to 11b (see
Table 3)
Modulus extender [12:2]
Fractional divisor code [20:13]
Reserved [23:21]
Reserved [25:24]
Function
Function
Bits [15:6]:
Note: The six MSBs of ndiv denote the M counter value and the four
LSBs denote the A counter value. For the 8/9 prescaler mode, the A
counter value requires only three bits. Therefore, bit [9] of ndiv is a
“don’t care” bit.
Reserved
Bit [17]:
0 = Modulator is reset or disabled
1 = Modulator is in fractional mode
Bit [18]:
0 = Modulator is in integer mode
1 = Modulator is in fractional mode
Reserved. This bit should always remain set (logic high).
These four bits need to be programmed together with bits [12:2] of
Word 3. Bits [23:20] represent the four LSBs ([3:0]) of the 15-bit
modulus extender value (ME [14:0]). Refer to the Synthesizer
Programming section of this Data Sheet for further information.
Reserved
These 11 bits need to be programmed together with bits [23:20] of
Word 2. Bits [12:2] represent the 11 MSBs ([14:4]) of the 15-bit
modulus extender value (ME [14:0]). Refer to the Synthesizer
Programming section of this Data Sheet for further information.
Bits [20:13] represent the 8-bit fractional divisor code (FN [7:0]).
Refer to the Synthesizer Programming section of this Data Sheet for
information.
These three bits should always remain cleared (logic low).
Reserved
Bits [15:10]
M bits [5:0]
M bits [5:0]
A bits [3:0] = use 16/17 prescaler
A bits [2:0] = use 8/9 prescaler
Bits [9:6]
State Description
State Description
DATA SHEET • SKY73112-11 VCO/SYNTHESIZER
Operational Value
Operational Value
Recommended
Recommended
Application
Application
Application
Application
dependent
dependent
dependent
dependent
(Binary)
(Binary)
00
11
00
1
0
1
1
0
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