LMK04821
,
LMK04826
,
LMK04828
www.ti.com
SNAS605AR –MARCH 2013–REVISED DECEMBER 2015
Electrical Characteristics (continued)
(3.15 V < V
CC
< 3.45 V, –40 °C < T
A
< 85 °C and T
PCB
≤ 105 °C. Typical values at V
CC
= 3.3 V, T
A
= 25 °C, at the
Recommended Operating Conditions and are not assured.)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INTERNAL VCO SPECIFICATIONS
VCO0 1930 2075
LMK04821 VCO Tuning Range MHz
VCO1
(11)
2920 3080
VCO0 1840 1970
f
VCO
LMK04826 VCO Tuning Range MHz
VCO1 2440 2505
VCO0 2370 2630
LMK04828 VCO Tuning Range MHz
VCO1 2920 3080
LMK04821 VCO0 12 to 20
LMK04821 Fine Tuning Sensitivity MHz/V
LMK04821 VCO1 15 to 24
LMK04826 VCO0 11 to 19
K
VCO
LMK04826 Fine Tuning Sensitivity MHz/V
LMK04826 VCO1 8 to 11
LMK04828 VCO0 at 2457.6 MHz 17 to 27
LMK04828 Fine Tuning Sensitivity MHz/V
LMK04828 VCO1 at 2949.12 MHz 17 to 23
Allowable Temperature Drift for After programming for lock, no changes
|ΔT
CL
| Continuous Lock to output configuration are permitted to 125 °C
(12)
assure continuous lock
(11) The VCO1 divider, VCO1_DIV in register 0x174, can be programmed to ÷2 to ÷8 resulting in a lower effective VCO frequency range as
shown in Device Configuration Information.
(12) Maximum Allowable Temperature Drift for Continuous Lock is how far the temperature can drift in either direction from the value it was
at the time that the 0x168 register was last programmed with PLL2_FCAL_DIS = 0, and still have the part stay in lock. The action of
programming the 0x168 register, even to the same value, activates a frequency calibration routine. This implies the part will work over
the entire frequency range, but if the temperature drifts more than the maximum allowable drift for continuous lock, then it will be
necessary to reload the appropriate register to ensure it stays in lock. Regardless of what temperature the part was initially programmed
at, the temperature can never drift outside the frequency range of –40 °C to 85 °C without violating specifications.
Copyright © 2013–2015, Texas Instruments Incorporated Submit Documentation Feedback 13
Product Folder Links: LMK04821 LMK04826 LMK04828
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