LMK04828 datasheet(13/113 Pages) TI1

13 / 113 page

LMK04821, LMK04826, LMK04828

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SNAS605AR – MARCH 2013 – REVISED DECEMBER 2015

Electrical Characteristics (continued)

(3.15 V < VCC < 3.45 V, –40 °C < TA < 85 °C and TPCB ≤ 105 °C. Typical values at VCC = 3.3 V, TA = 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

fVCO

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

KVCO

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

ΔTCL|

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.

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