|
|
MEMS osciliatoriai 50.0 MHZ 3.3V 50PPM -40+85C
- ASEM1-50.000MHZ-LC-T
- ABRACON
-
1:
2,29 €
-
40 859Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASEM1-50.0-LCT
|
ABRACON
|
MEMS osciliatoriai 50.0 MHZ 3.3V 50PPM -40+85C
|
|
40 859Prieinamumas
|
|
|
2,29 €
|
|
|
1,75 €
|
|
|
1,69 €
|
|
|
1,63 €
|
|
|
1,39 €
|
|
|
Peržiūrėti
|
|
|
1,60 €
|
|
|
1,56 €
|
|
|
1,37 €
|
|
|
1,33 €
|
|
Min.: 1
Daugkart.: 1
|
|
3.2 mm x 2.5 mm
|
50 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
|
- 40 C
|
+ 85 C
|
ASEM1
|
|
|
|
MEMS osciliatoriai 50.00 MHZ
- ASVMPC-50.000MHZ-Z-T
- ABRACON
-
1:
3,28 €
-
6 029Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASVMPC-50ZT
|
ABRACON
|
MEMS osciliatoriai 50.00 MHZ
|
|
6 029Prieinamumas
|
|
|
3,28 €
|
|
|
2,80 €
|
|
|
2,61 €
|
|
|
2,55 €
|
|
|
2,47 €
|
|
|
2,43 €
|
|
Min.: 1
Daugkart.: 1
|
|
7 mm x 5 mm
|
50 MHz
|
50 PPM
|
15 pF
|
2.25 V
|
3.6 V
|
CMOS
|
|
- 55 C
|
+ 125 C
|
ASVMP
|
|
|
|
MEMS osciliatoriai 12.0 MHZ 15PF 3.3V
- ASDMB-12.000MHZ-LC-T
- ABRACON
-
1:
2,10 €
-
41 321Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASDMB-12MHZ-LC
|
ABRACON
|
MEMS osciliatoriai 12.0 MHZ 15PF 3.3V
|
|
41 321Prieinamumas
|
|
|
2,10 €
|
|
|
1,70 €
|
|
|
1,61 €
|
|
|
1,43 €
|
|
|
1,41 €
|
|
|
1,35 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
12 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
|
- 40 C
|
+ 85 C
|
ASDMB
|
|
|
|
MEMS osciliatoriai 24.00 MHZ CMOS
- ASEMB-24.000MHZ-LC-T
- ABRACON
-
1:
2,24 €
-
10 249Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASEMB-24MHZ-LC
|
ABRACON
|
MEMS osciliatoriai 24.00 MHZ CMOS
|
|
10 249Prieinamumas
|
|
|
2,24 €
|
|
|
1,94 €
|
|
|
1,75 €
|
|
|
1,67 €
|
|
|
1,37 €
|
|
|
Peržiūrėti
|
|
|
1,54 €
|
|
|
1,51 €
|
|
|
1,35 €
|
|
|
1,25 €
|
|
Min.: 1
Daugkart.: 1
|
|
3.2 mm x 2.5 mm
|
24 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
|
- 40 C
|
+ 85 C
|
ASEMB
|
|
|
|
MEMS osciliatoriai 25.0 MHZ
- ASFLMB-25.000MHZ-XY-T
- ABRACON
-
1:
3,52 €
-
5 399Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASFLMB-25-XY-T
|
ABRACON
|
MEMS osciliatoriai 25.0 MHZ
|
|
5 399Prieinamumas
|
|
|
3,52 €
|
|
|
3,04 €
|
|
|
2,73 €
|
|
|
2,62 €
|
|
|
2,29 €
|
|
|
Peržiūrėti
|
|
|
2,49 €
|
|
|
2,38 €
|
|
|
2,12 €
|
|
|
2,08 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
25 MHz
|
10 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
5 mA, 6 mA, 7 mA
|
- 40 C
|
+ 105 C
|
ASFLMB
|
|
|
|
MEMS osciliatoriai Oscillator 5032 4-SMD 66.6666MHz 10ppm -40 C 85 C CMOS 1.8V 3.3V
- ASFLMB-66.6666MHZ-LY-T
- ABRACON
-
1:
2,37 €
-
5 470Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASFLMB-66.6-LY-T
|
ABRACON
|
MEMS osciliatoriai Oscillator 5032 4-SMD 66.6666MHz 10ppm -40 C 85 C CMOS 1.8V 3.3V
|
|
5 470Prieinamumas
|
|
|
2,37 €
|
|
|
2,36 €
|
|
|
2,35 €
|
|
|
2,34 €
|
|
|
2,18 €
|
|
|
2,18 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
66.6666 MHz
|
10 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
6 mA, 7 mA, 8 mA
|
- 40 C
|
+ 85 C
|
ASFLMB
|
|
|
|
MEMS osciliatoriai Oscillator 2520 4-SMD 25MHz 25ppm -40 C 85 C CMOS 1.71V 3.63V
- AMPMDFB-25.0000T
- ABRACON
-
1:
2,28 €
-
25 813Prieinamumas
|
„Mouser“ Dalies Nr.
815-AMPMDFB-25.0000T
|
ABRACON
|
MEMS osciliatoriai Oscillator 2520 4-SMD 25MHz 25ppm -40 C 85 C CMOS 1.71V 3.63V
|
|
25 813Prieinamumas
|
|
|
2,28 €
|
|
|
1,96 €
|
|
|
1,77 €
|
|
|
1,69 €
|
|
|
1,51 €
|
|
|
1,27 €
|
|
Min.: 1
Daugkart.: 1
|
|
2.5 mm x 2 mm
|
25 MHz
|
25 PPM
|
|
1.71 V
|
3.63 V
|
CMOS
|
1.3 mA
|
- 40 C
|
+ 85 C
|
AMPM
|
|
|
|
MEMS osciliatoriai 50 MHZ 50PPM -40+85C
- ASDMB-50.000MHZ-LC-T
- ABRACON
-
1:
2,25 €
-
10 437Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASDMB-50MHZ-LC
|
ABRACON
|
MEMS osciliatoriai 50 MHZ 50PPM -40+85C
|
|
10 437Prieinamumas
|
|
|
2,25 €
|
|
|
1,94 €
|
|
|
1,85 €
|
|
|
1,68 €
|
|
|
1,38 €
|
|
|
Peržiūrėti
|
|
|
1,54 €
|
|
|
1,51 €
|
|
|
1,34 €
|
|
|
1,25 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
50 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
|
- 40 C
|
+ 85 C
|
ASDMB
|
|
|
|
MEMS osciliatoriai 16.0 MHZ 3.3V 50PPM -40+85C
- ASEM1-16.000MHZ-LC-T
- ABRACON
-
1:
2,26 €
-
9 249Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASEM1-16-LCT
|
ABRACON
|
MEMS osciliatoriai 16.0 MHZ 3.3V 50PPM -40+85C
|
|
9 249Prieinamumas
|
|
|
2,26 €
|
|
|
1,88 €
|
|
|
1,81 €
|
|
|
1,63 €
|
|
|
1,41 €
|
|
|
Peržiūrėti
|
|
|
1,45 €
|
|
|
1,39 €
|
|
|
1,34 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
16 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
|
- 40 C
|
+ 85 C
|
ASEM1
|
|
|
|
MEMS osciliatoriai Oscillator 3225 4-SMD 8MHz 50ppm -40 C 85 C CMOS 3.3V
- ASEM1-8.000MHZ-LC-T
- ABRACON
-
1:
2,19 €
-
10 697Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASEM1-8.0-LCT
|
ABRACON
|
MEMS osciliatoriai Oscillator 3225 4-SMD 8MHz 50ppm -40 C 85 C CMOS 3.3V
|
|
10 697Prieinamumas
|
|
|
2,19 €
|
|
|
1,65 €
|
|
|
1,55 €
|
|
|
1,51 €
|
|
|
1,35 €
|
|
|
1,33 €
|
|
Min.: 1
Daugkart.: 1
|
|
3.2 mm x 2.5 mm
|
8 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
|
- 40 C
|
+ 85 C
|
ASEM1
|
|
|
|
MEMS osciliatoriai Oscillator 5032 4-SMD 80MHz 10ppm -40 C 105 C CMOS 1.8V 3.3V
- ASFLMB-80.000MHZ-XY-T
- ABRACON
-
1:
3,31 €
-
6 764Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASFLMB-80-XY-T
|
ABRACON
|
MEMS osciliatoriai Oscillator 5032 4-SMD 80MHz 10ppm -40 C 105 C CMOS 1.8V 3.3V
|
|
6 764Prieinamumas
|
|
|
3,31 €
|
|
|
3,04 €
|
|
|
2,73 €
|
|
|
2,62 €
|
|
|
2,22 €
|
|
|
Peržiūrėti
|
|
|
2,49 €
|
|
|
2,37 €
|
|
|
2,19 €
|
|
|
2,16 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
80 MHz
|
10 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
7 mA, 8 mA, 9 mA
|
- 40 C
|
+ 105 C
|
ASFLMB
|
|
|
|
MEMS osciliatoriai Oscillator 5032 4-SMD 48MHz 50ppm -40 C 85 C CMOS 1.8V 3.3V
- ASFLMB-48.000MHZ-LC-T
- ABRACON
-
1:
1,83 €
-
9 769Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASFLMB-48MHZ-LC
|
ABRACON
|
MEMS osciliatoriai Oscillator 5032 4-SMD 48MHz 50ppm -40 C 85 C CMOS 1.8V 3.3V
|
|
9 769Prieinamumas
|
|
|
1,83 €
|
|
|
1,66 €
|
|
|
1,65 €
|
|
|
1,38 €
|
|
|
1,38 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
48 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
6 mA, 7 mA, 8 mA
|
- 40 C
|
+ 85 C
|
ASFLMB
|
|
|
|
MEMS osciliatoriai Oscillator 5032 6-SMD 100MHz 25ppm -40 C 85 C HCSL 2.25V 3.6V
- ASFLMPHC-100.000MHZ-LR-T
- ABRACON
-
1:
4,30 €
-
6 242Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASFLMPHC-100LR
|
ABRACON
|
MEMS osciliatoriai Oscillator 5032 6-SMD 100MHz 25ppm -40 C 85 C HCSL 2.25V 3.6V
|
|
6 242Prieinamumas
|
|
|
4,30 €
|
|
|
3,72 €
|
|
|
3,35 €
|
|
|
2,61 €
|
|
|
2,60 €
|
|
|
2,60 €
|
|
Min.: 1
Daugkart.: 1
|
|
5 mm x 3.2 mm
|
100 MHz
|
25 PPM
|
2 pF
|
2.25 V
|
3.6 V
|
HCSL
|
|
- 40 C
|
+ 85 C
|
ASFLMP
|
|
|
|
MEMS osciliatoriai 25.0 MHZ 3.3V 15PF LVCMOS
- ASDM1-25.000MHZ-LC-T
- ABRACON
-
1:
1,78 €
-
12 063Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASDM1-25.0-LCT
|
ABRACON
|
MEMS osciliatoriai 25.0 MHZ 3.3V 15PF LVCMOS
|
|
12 063Prieinamumas
|
|
|
1,78 €
|
|
|
1,53 €
|
|
|
1,38 €
|
|
|
1,32 €
|
|
|
1,13 €
|
|
|
Peržiūrėti
|
|
|
1,26 €
|
|
|
1,24 €
|
|
|
1,09 €
|
|
|
1,01 €
|
|
Min.: 1
Daugkart.: 1
|
|
2.5 mm x 2 mm
|
25 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
LVCMOS
|
|
- 40 C
|
+ 85 C
|
ASDM
|
|
|
|
MEMS osciliatoriai Oscillator 2520 4-SMD 7.3728MHz 10ppm -40 C 85 C CMOS 1.8V 3.3V
- ASDMB-7.3728MHZ-LY-T
- ABRACON
-
1:
3,46 €
-
915Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASDMB-7.37-LY-T
|
ABRACON
|
MEMS osciliatoriai Oscillator 2520 4-SMD 7.3728MHz 10ppm -40 C 85 C CMOS 1.8V 3.3V
|
|
915Prieinamumas
|
|
|
3,46 €
|
|
|
2,98 €
|
|
|
2,69 €
|
|
|
2,58 €
|
|
|
2,08 €
|
|
|
Peržiūrėti
|
|
|
2,46 €
|
|
|
2,07 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
7.3728 MHz
|
10 PPM
|
15 pF
|
1.7 V
|
3.6 V
|
|
|
- 40 C
|
+ 85 C
|
ASDMB
|
|
|
|
MEMS osciliatoriai Oscillator 7050 4-SMD 30MHz 10ppm -40 C 105 C CMOS 1.8V 3.3V
- ASVMB-30.000MHZ-XY-T
- ABRACON
-
1:
3,85 €
-
1 178Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASVMB-30MXYT
|
ABRACON
|
MEMS osciliatoriai Oscillator 7050 4-SMD 30MHz 10ppm -40 C 105 C CMOS 1.8V 3.3V
|
|
1 178Prieinamumas
|
|
|
3,85 €
|
|
|
3,76 €
|
|
|
2,48 €
|
|
|
2,30 €
|
|
Min.: 1
Daugkart.: 1
|
|
7 mm x 5 mm
|
30 MHz
|
10 PPM
|
|
1.7 V
|
3.3 V
|
LVCMOS
|
|
- 40 C
|
+ 105 C
|
ASVMB
|
|
|
|
MEMS osciliatoriai Oscillator 2520 4-SMD 12.288MHz 25ppm -40 C 85 C CMOS 1.71V 3.63V
- AMPMDFB-12.2880T
- ABRACON
-
1:
2,29 €
-
992Prieinamumas
|
„Mouser“ Dalies Nr.
815-AMPMDFB-12.2880T
|
ABRACON
|
MEMS osciliatoriai Oscillator 2520 4-SMD 12.288MHz 25ppm -40 C 85 C CMOS 1.71V 3.63V
|
|
992Prieinamumas
|
|
|
2,29 €
|
|
|
1,97 €
|
|
|
1,86 €
|
|
|
1,44 €
|
|
|
1,27 €
|
|
Min.: 1
Daugkart.: 1
|
|
2.5 mm x 2 mm
|
12.288 MHz
|
25 PPM
|
|
1.71 V
|
3.63 V
|
CMOS
|
1.3 mA
|
- 40 C
|
+ 85 C
|
AMPM
|
|
|
|
MEMS osciliatoriai Oscillator 5032 4-SMD 80MHz 10ppm -40 C 85 C CMOS 1.8V 3.3V
- ASFLMB-80.000MHZ-LY-T
- ABRACON
-
1:
3,83 €
-
1 309Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASFLMB-80-LY-T
|
ABRACON
|
MEMS osciliatoriai Oscillator 5032 4-SMD 80MHz 10ppm -40 C 85 C CMOS 1.8V 3.3V
|
|
1 309Prieinamumas
|
|
|
3,83 €
|
|
|
3,30 €
|
|
|
3,14 €
|
|
|
2,99 €
|
|
|
2,86 €
|
|
|
Peržiūrėti
|
|
|
2,86 €
|
|
|
2,30 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
80 MHz
|
10 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
7 mA, 8 mA, 9 mA
|
- 40 C
|
+ 85 C
|
ASFLMB
|
|
|
|
MEMS osciliatoriai Oscillator 2520 4-SMD 60MHz 50ppm -40 C 85 C CMOS 1.8V 3.3V
- ASDMB-60.000MHZ-LC-T
- ABRACON
-
1:
2,48 €
-
823Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASDMB-60MHZ-LC
|
ABRACON
|
MEMS osciliatoriai Oscillator 2520 4-SMD 60MHz 50ppm -40 C 85 C CMOS 1.8V 3.3V
|
|
823Prieinamumas
|
|
|
2,48 €
|
|
|
2,13 €
|
|
|
2,03 €
|
|
|
1,84 €
|
|
|
1,44 €
|
|
|
Peržiūrėti
|
|
|
1,69 €
|
|
|
1,67 €
|
|
|
1,42 €
|
|
|
1,38 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
60 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
|
- 40 C
|
+ 85 C
|
ASDMB
|
|
|
|
MEMS osciliatoriai MEMS OSC XO 2.25V-3.6V 14VFQFN
- ASEMDLV-LR
- ABRACON
-
1:
16,17 €
-
122Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASEMDLV-LR
|
ABRACON
|
MEMS osciliatoriai MEMS OSC XO 2.25V-3.6V 14VFQFN
|
|
122Prieinamumas
|
|
Min.: 1
Daugkart.: 1
|
|
3.2 mm x 2.5 mm
|
400 MHz
|
25 PPM
|
2 pF
|
2.25 V
|
3.6 V
|
LVDS
|
|
- 40 C
|
+ 85 C
|
ASEMDLV
|
|
|
|
MEMS osciliatoriai Oscillator 2520 4-SMD 27MHz 50ppm -40 C 85 C CMOS 3.3V
- ASDM1-27.000MHZ-LC-T
- ABRACON
-
1:
1,79 €
-
1 511Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASDM1-27.0-LCT
|
ABRACON
|
MEMS osciliatoriai Oscillator 2520 4-SMD 27MHz 50ppm -40 C 85 C CMOS 3.3V
|
|
1 511Prieinamumas
|
|
|
1,79 €
|
|
|
1,62 €
|
|
|
1,58 €
|
|
|
1,52 €
|
|
|
Peržiūrėti
|
|
|
1,29 €
|
|
|
1,49 €
|
|
|
1,31 €
|
|
|
1,29 €
|
|
Min.: 1
Daugkart.: 1
|
|
2.5 mm x 2 mm
|
27 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
LVCMOS
|
|
- 40 C
|
+ 85 C
|
ASDM
|
|
|
|
MEMS osciliatoriai Oscillator 2520 4-SMD 80MHz 50ppm -40 C 85 C CMOS 3.3V
- ASDM1-80.000MHZ-LC-T
- ABRACON
-
1:
2,12 €
-
1 902Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASDM1-80.0-LCT
|
ABRACON
|
MEMS osciliatoriai Oscillator 2520 4-SMD 80MHz 50ppm -40 C 85 C CMOS 3.3V
|
|
1 902Prieinamumas
|
|
|
2,12 €
|
|
|
1,38 €
|
|
|
1,34 €
|
|
|
1,34 €
|
|
Min.: 1
Daugkart.: 1
|
|
2.5 mm x 2 mm
|
80 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
LVCMOS
|
|
- 40 C
|
+ 85 C
|
ASDM
|
|
|
|
MEMS osciliatoriai Oscillator 2520 4-SMD 11.0592MHz 10ppm -40 C 85 C CMOS 1.8V 3.3V
- ASDMB-11.0592MHZ-LY-T
- ABRACON
-
1:
3,31 €
-
866Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASDMB-11.05-LY-T
|
ABRACON
|
MEMS osciliatoriai Oscillator 2520 4-SMD 11.0592MHz 10ppm -40 C 85 C CMOS 1.8V 3.3V
|
|
866Prieinamumas
|
|
|
3,31 €
|
|
|
2,73 €
|
|
|
2,67 €
|
|
|
2,50 €
|
|
|
2,19 €
|
|
|
Peržiūrėti
|
|
|
2,40 €
|
|
|
2,36 €
|
|
|
2,09 €
|
|
|
2,06 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
11.0592 MHz
|
10 PPM
|
15 pF
|
1.7 V
|
3.6 V
|
LVCMOS
|
|
- 40 C
|
+ 85 C
|
ASDMB
|
|
|
|
MEMS osciliatoriai 16.0 MHZ 10PPM -40+105
- ASDMB-16.000MHZ-XY-T
- ABRACON
-
1:
3,31 €
-
975Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASDMB-16-XY-T
|
ABRACON
|
MEMS osciliatoriai 16.0 MHZ 10PPM -40+105
|
|
975Prieinamumas
|
|
|
3,31 €
|
|
|
2,73 €
|
|
|
2,61 €
|
|
|
2,25 €
|
|
|
2,25 €
|
|
|
2,24 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
16 MHz
|
10 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
|
- 40 C
|
+ 105 C
|
ASDMB
|
|
|
|
MEMS osciliatoriai 26.0 MHZ 50PPM -40+85C
- ASDMB-26.000MHZ-LC-T
- ABRACON
-
1:
2,22 €
-
6 227Prieinamumas
|
„Mouser“ Dalies Nr.
815-ASDMB-26MHZ-LC
|
ABRACON
|
MEMS osciliatoriai 26.0 MHZ 50PPM -40+85C
|
|
6 227Prieinamumas
|
|
|
2,22 €
|
|
|
1,91 €
|
|
|
1,73 €
|
|
|
1,65 €
|
|
|
1,32 €
|
|
|
Peržiūrėti
|
|
|
1,61 €
|
|
|
1,47 €
|
|
|
1,31 €
|
|
|
1,29 €
|
|
Min.: 1
Daugkart.: 1
|
|
QFN-4
|
26 MHz
|
50 PPM
|
15 pF
|
1.8 V
|
3.3 V
|
CMOS
|
|
- 40 C
|
+ 85 C
|
ASDMB
|
|
Lietuva