TDK-ATB2012-75011-T000
| Part # | TDK-ATB2012-75011-T000 |
| Download | TDK-ATB2012-75011-T000 |
R F
C o m p o n e n t s
July 2013
൶ळ
–
൶ळ
ק
४ධ
Ꮰ
SMD
ATB
Ⴜள
A
T
B2012-50011 (2.0
ꢀ
1.2
ꢀ
1.2mm)
A
T
B2012-75011 (2.0
ꢀ
1.2
ꢀ
1.2mm)
A
T
B2012E-50011M (2.0
ꢀ
1.2
ꢀ
1.0mm)
A
T
B2012E-75011M (2.0
ꢀ
1.2
ꢀ
1.0mm)
(2/13)
R F
C o m p o n e n t s
ቂ᎙ሃჵ
ቂׁٛ൰ˈขႚ
כ
ཱུ
ࢆࣙࢭتࡒ
༚ȃ
ภ᎙ሃჵ
ቂׁٛ൰ˈข᎙ሃภჵȃ
᎙ ሃ
֦
܃
ৱၓ
6
ࢋ
ኟᇵˈ֦
܃
˄ၫ
ޡ
5
ȋ
40°C
Ȃ
ޡ
10
ȋ
75%RH
ᇵ
˅
ˈ
ᅍ
ࠍڣ
᎙ሃȃ
٫
ࣰ
֦
܃
ৱˈ
ޤ
Ꮚ
ݢ
সܿ૰उᄹਖ૰फ़ȃ
ข႙න࿒
ࡄ
० ˄ᆑȂȂ৻݃˅ቂञ֦
࣏
ȃ
उਾˈขႚ
כ
ᄵኁȃ
ኁၫ
ޡ
ቪउਾၫ
ޡ
ঽᄣၫ
ޡ
ܿၫ
ޡ
ُᇋ
150°C
ᇵȃ
Ꭷॄܿउਾᅃጸሥ
ࢆࣙ
༚
ށࣙ
ܿ߭ၐȃ
ৠ
ޡࣰ
૰ܷ
ޥ
௸Ȃᄹਠ݈Ȃ༊ಛਂຬȃ
ਖᎧமᄣܿሠ༱
ݢ
௸ᏠᎧܸᎧˈข᎙ሃ
ᇋሓሠ༱
ݢ
௸ጶ࿒
ק
ᄳড
ؠࢿ
݃ટ
קؠ
ᄳ
ࢍߑ
ᄣৠ໔ሥஉȃ
Ꭷঐሓ
ߑݢ
Ꮛၻ
ߙ
˄ၫ
ޡ
ຢ໐
˅
ˈ
ሓۨົ
ߴ
ಅᅍௗ
ࠍڣ
ݓ
ȃ
߾
ۢൺ
ב
ᄲন֊ົᅍ᎙ሃിღปȃ
།ܸ
ݢ
ۢ
࡞
ฺ૰ঐܷႜ
ވ
Ꮾȃ
ቈเ࿒ྈ
ܕ
ܿ
ݢ
ঐ
ۈ
ܸਾ
ݓ
ღຢˈሓۨขቂ߷
ݢ
ှ
ܕ
ȃ
ข႙ਖׁٛ൰૦੧ۢড
ܕ
ۢஉܿ႘࿒ȃ
ข
ࢆࣙࢭت
༚
ށࣙ
ܿ߭ၐቂȃ
ׁٛ൰಼፩ኵܿٛ൰ፑቂ
Ꮃቂဉሃሆຢቂᇜֈ
ݢ
Ꮚົֻ˄
AV
ົֻˈᄪົֻˈয়
ݢ
ٛ൰ˈቨົֻˈིົֻˈ
ࢋ
เົֻˈ֑
࢞
ົֻˈ
ك
ົֻˈ
ᇖධเ
˅
ˈ
෩
ࡘ
ᇜֈ
ݢ
Ꮚົֻᇋ٢ܿ
غ
Ꮾञቂ
ߟߴ
ቂȃ
ޭᅍᇋ
ޡࡴ
ภᄹञ૰૦ᄹܿˈডጚົֻܿ
ࢽ
ጊˈႜ
ވ
ᏮˈከᎡ
ட૰ঐ
ࢍ
เܿໍಛˈເ࿒ঽ
ا
ٛ݃ዉ
ڈ
ཿ
ࣷ
ˈᇵঽ૰ٛໍಧ
ܐ
຺ঐሯჳܿᇵቂဉ ˄ᇵ
څ
‘
࿅
ށ
ቂဉ
’
˅፩ܿቂᄹˈᄹ
ߙ
ংˈ൰፣ˈׁ
࢞
ཌྷ
ቧ֦ጽȃ
ॖኁ
ށ
ׁٛ൰಼ܿ߭ၐˈፇိˈডጚ࿅
ށ
ቂဉ፩ቂˈขᏀᅲׁ
࢞
ཌྷყ
ؠ࣋
ȃׁ
࢞
ཌྷঐിठॖᅍชˈᇜඩᄒຟ
ׁٛ൰಼፩ྈኵܿቂቂဉȃ
(1)
ऎૼˈऎ࿙ົֻ
(2)
ከ༕ົֻ ˄ප
ٴ
ˈ
ٴݢ
ˈ
ۉ
ؑ݃˅
(3)
ᇞனົֻ
(8)
ࢥ࢞
ᄹܿ
ޡࡴ
ᄪႩ
ۃ
୲ົֻ
(9)
ૅቂົֻ
(10)
ݢ
ቂ൰ˈัຨົֻ
(11)
߷ኳ߷ܼົֻ
(4)
ݢߙ
૿፟ົֻ
(5)
ज
ވ
உყ
࣋
ົֻȁȁ
(6)
ݒࣴ
ົֻ
(12)
ࢌ
፯ภᎧ
(13)
ඝྊ
־
ไ
ށ
ၓ࿅
ށ
ቂဉܿቂဉ
(7)
ਦ
ન૿፟ົֻ
ۨိˈޭቂׁٛ൰಼፩ྈኵٛ൰ܿົֻᄵົˈขฬ֦
࠲
ठ
ࡘ
ົֻܿቂቂဉঽᎫྙ֦ܿ॓ই௸ञᎧˈົֻቂই௸݃ȃ
001-01 / 20130722 / c751_woundbalun_atb.
(3/13)
R F
C o m p o n e n t s
RoHS
ፑޭሥٛ൰
ႇ௲ཧ
൶ळ
–
൶ळ
ק
४ධ
Ꮰ
SMD
ႇලउਾޭሥ
Ⴜள࡚ܿᇋ
A
T
B
࿅
ݞ
ATB2012-50011
Ȃ
ATB2012-75011
Ȃ
ATB2012E-50011M
Ȃ
ATB2012E-75011M
׳ࠍ
ၓቂ
50
ꢁ
Ȃ
75
ꢁ
Ȃ
50
ꢁ
Ȃ
75
ꢁ
ᏟૠႼ
ߑ
ߙ
ܿ
൶ळ
–
൶ळ
ק
ᅼධȃ
༕Ꮯૠ
ߴ
ಅˈ
ATB2012-50011
ቪ
ATB2012E-50011M
ၓ
50
ꢁ
Ȃ
ATB2012-75011
ቪ
ATB2012E-75011M
ၓ
75
ꢁ
ȃ
Ꮯૠ
ၓ
1:1
ȃ
൮ఋ
ܕ
ଔၓ
ATB2012-50011
˄
40MHz
ȋ
860MHz (
Ꮃ
IL=1.0dB)
˅
Ȃ
ATB2012E-50011M
˄
400MHz
ȋ
1.8GHz (
Ꮃ
IL =1.0dB)
˅
Ȃ
ATB2012-75011
˄
50MHz
ȋ
1.2GHz (
Ꮃ
IL=0.8dB)
˅
Ȃ
ATB2012E-75011M
˄
400MHz
ȋ
1.8GHz (
Ꮃ
IL=1.0dB)
˅
ȃ
ቂဉ
TV
ঽᇧ
ވ
፮
ޤ
ܿ
ݲ
ᄘධ
(DVB-T/H
Ȃ
ISDB-T
݃
)
STB
ঽ
ݲ
ᄘධܿ༕
ࠍ
൮ධ
ᄲखܿಛಚ
ߟߴ
A
T
B
2012
–
–
500
11
–
T
ɕɕɕ
L×W×H
ߟ܄
(mm)
2012 2.0×1.2×1.2
உᏟૠ
(
ꢁ
)
Ⴜளಚ
څ
Ꮯૠ
֡Ꭷᄳ
࣏
୲
࠲
ख
500
750
50
75
11
1:1
T
TL
ø180mm
શ
ø330mm
શ
A
T
B
2012E
500
11
M
–
T
ɕɕ
L×W×H
ߟ܄
(mm)
உᏟૠ
(
ꢁ
)
Ⴜளಚ
څ
Ꮯૠ
ٛ൰
࠲׳
ख
֡Ꭷᄳ
࣏
୲
࠲
ख
2012 2.0×1.2×1.0
500
750
50
75
11
1:1
M
T
TL
ø180mm
શ
ø330mm
શ
ቂၫ
ޡ
߭ၐȂ֡Ꭷ༮Ȃٛ൰፱
ၫ
ޡ
߭ၐ
֡Ꭷ༮
ܠ
ࢋ
፱
ꢂ
ꢂꢂ
ᄲ
Ꮾၫ
ޡ
֦
܃
ၫ
ޡ
શ
˄
°C
˅
˄
°C
˅
˄
ࢋ
/
શ˅
2,000
10,000
2,000
10,000
2,000
10,000
2,000
˄
mg
˅
ø180mm
ø330mm
ø180mm
ø330mm
ø180mm
ø330mm
ø180mm
ø330mm
ATB2012-50011
ATB2012-75011
–40 to +85
–40 to +85
–40 to +85
–40 to +85
–40 to +85
–40 to +85
–40 to +85
–40 to +85
10
10
10
10
A
T
B2012E-50011M
A
T
B2012E-75011M
10,000
ꢂꢃ
Ꮾၫ
ޡ
߭ၐ֡ଭᏋၻၫ
ޡ
ຢ໐ȃ
ꢂꢂꢃ
֦
܃
ၫ
ޡ
߭ၐন֊Ꭷॄმȃ
ႇ௲ཧ˖ፑܿ
Cl
ࣽ
ܸ
900ppm
Ȃ
Br
ࣽ
ܸ
900ppm
ᇵঽ
Cl
Ȃ
Br
ܿठ
ࣽ
ܸ
1500ppm
ȃ
·
ኵ๒ˈౚቧ
ࡻ
ܿଝ૰࡙ञ
ק
ˈขቧᇵ੍ȃ
001-01 / 20130722 / c751_woundbalun_atb.
(4/13)
R F
C o m p o n e n t s
Ⴜள࡚ܿᇋ
A
T
B
ထਃইउၫ
ޡ
ฑღဇ
Preheating
Soldering
Natural
cooling
Peak
T4
T3
T3
T2
t3
t2
T1
t1
t:
Time
Preheating
Temp.
T1
Soldering
Temp.
T3
Peak
Temp.
T4
Time
t1
Time
t2
Time
t3
T2
150°C
180°C
60 to 120s
230°C
10 to 30s
245°C
5s max.
·
ኵ๒ˈౚቧ
ࡻ
ܿଝ૰࡙ञ
ק
ˈขቧᇵ੍ȃ
001-01 / 20130722 / c751_woundbalun_atb.
(5/13)
R F
C o m p o n e n t s
A
T
B
Ⴜள
ᄲ
A
T
B2012-50011
ᄳᎫቪ
܄ڞ
2.0 0.2
1
4
2
3
0.4
1.2
0.4
Dimensions in mm
ထਃउധ
؝
ટ
ݢ
௸ဇ
2.7
1.2
Unbalanced Port
50
Ω
Balanced Port
50
Ω
1
4
2
3
Dimensions in mm
·
ኵ๒ˈౚቧ
ࡻ
ܿଝ૰࡙ञ
ק
ˈขቧᇵ੍ȃ
001-01 / 20130722 / c751_woundbalun_atb.
(6/13)
R F
C o m p o n e n t s
A
T
B
Ⴜளȁ
ᄲ
ATB2012-50011
ݢ
න࿅
ݞ
࿅
װࢆࣙݞ
UB/B
ن
ཿक
(dB)
CMRR
min.
൮ఋ൮
ܕ
Ꮯૠ
ፊ
ݢ
Ꮯ
(
ꢁ
)max.
߇
ݢށ
ݢށ߇
ᅼ ુኒ
ݢ
Ꮯ ೊ
ݢ
ᅼ
ᄲख
(MHz)
(mA)
(V)
(M
ꢁ
)
(V)
typ.
max.
(
ꢁ
)
40 to 860
50/50
1.0
2.5
20
1.0
200
20
10
125
A
T
B2012-50011-T
ɐ
ك
ົֻ
ك
ჵ಼
ፊ
ݢ
Ꮯ
ુኒ
ݢ
Ꮯ
ن
ཿक
ই؉ཿक
ᄲख
4338A
4339A
E5071B
E5071B
E5071B
E5071B
٦ຟ
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Amplitude imbalance
Phase balance
ˆቂ݃
ك
ົֻȃ
൮ఋ࿅ᄹ
ن
ཿक
ই؉ཿक
0
5
0.0
1.0
2.0
3.0
4.0
5.0
6.0
10
15
20
25
30
35
0
100 200 300 400 500 600 700 800 90
0
1
000
0 100
200 300 400 500 600 700 800 90
0
1
000
(
)
(
)
Frequency MHz
Frequency MHz
AMPLITUDE IMBALANCE
PHASE BALANCE
5.0
4.0
3.0
2.0
1.0
0
185
184
183
182
181
180
179
178
177
176
175
0
100 200 300 400 500 600 700 800 90
0
1
000
0 100
200 300 400 500 600 700 800 90
0
1
000
(
)
(
)
Frequency MHz
Frequency MHz
·
ኵ๒ˈౚቧ
ࡻ
ܿଝ૰࡙ञ
ק
ˈขቧᇵ੍ȃ
001-01 / 20130722 / c751_woundbalun_atb.
(7/13)
R F
C o m p o n e n t s
A
T
B
Ⴜள
ᄲ
A
T
B2012E-50011M
ᄳᎫቪ
܄ڞ
2.0 0.2
1
4
2
3
0.4
1.2
0.4
Dimensions in mm
ထਃउധ
؝
ટ
ݢ
௸ဇ
2.7
1.2
Unbalanced Port
Balanced Port
50
ꢁ
50
ꢁ
1
2
4
3
Dimensions in mm
·
ኵ๒ˈౚቧ
ࡻ
ܿଝ૰࡙ञ
ק
ˈขቧᇵ੍ȃ
001-01 / 20130722 / c751_woundbalun_atb.
(8/13)
R F
C o m p o n e n t s
A
T
B
Ⴜளȁ
ᄲ
ATB2012E-50011M
ݢ
න࿅
ݞ
࿅
װࢆࣙݞ
UB/B
ن
ཿक
(dB)
CMRR
min.
൮ఋ൮
ܕ
Ꮯૠ
ፊ
ݢ
Ꮯ
(
ꢁ
)max.
߇
ݢށ
ݢށ߇
ᅼ ુኒ
ݢ
Ꮯ
ೊ
ݢ
ᅼ
ᄲख
(MHz)
(mA)
(V)
(M
ꢁ
)
(V)
typ.
max.
(
ꢁ
)
400 to 1800
50/50
1.0
2.2
15
0.5
150
20
10
125
A
T
B2012E-50011M-T
ɐ
ك
ົֻ
ك
ჵ಼
ፊ
ݢ
Ꮯ
ુኒ
ݢ
Ꮯ
ن
ཿक
ই؉ཿक
ᄲख
4338A
4339A
E5071B
E5071B
E5071B
E5071B
٦ຟ
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Amplitude imbalance
Phase balance
ˆቂ݃
ك
ົֻȃ
൮ఋ࿅ᄹ
ن
ཿक
ই؉ཿक
0
5
0
1
2
3
4
5
6
7
8
9
10
15
20
25
30
35
40
45
0
200 400 600 800
1000 1200 1400 1500 1800
0
200 400 600 800
1000 1200 1400 1500 1800
( )
Frequency MHz
(
)
Frequency MHz
AMPLITUDE IMBALANCE
PHASE BALANCE
200
195
190
185
180
175
170
165
160
10
9
8
7
6
5
4
3
2
1
0
0
200 400 600 800
1000 1200 1400 1500 1800
0
200 400 600 800
1000 1200 1400 1500 1800
( )
Frequency MHz
(
)
Frequency MHz
·
ኵ๒ˈౚቧ
ࡻ
ܿଝ૰࡙ञ
ק
ˈขቧᇵ੍ȃ
001-01 / 20130722 / c751_woundbalun_atb.
(9/13)
R F
C o m p o n e n t s
A
T
B
Ⴜள
ᄲ
A
T
B2012-75011
ᄳᎫቪ
܄ڞ
2.0 0.2
1
4
2
3
0.4
1.2
0.4
Dimensions in mm
ထਃउധ
؝
ટ
ݢ
௸ဇ
Unbalanced Port
Balanced Port
2.7
1.2
75
Ω
75
Ω
1
2
4
3
Dimensions in mm
·
ኵ๒ˈౚቧ
ࡻ
ܿଝ૰࡙ञ
ק
ˈขቧᇵ੍ȃ
001-01 / 20130722 / c751_woundbalun_atb.
(10/13)
R F
C o m p o n e n t s
A
T
B
Ⴜளȁ
ᄲ
ATB2012-75011
ݢ
න࿅
ݞ
࿅
װࢆࣙݞ
UB/B
ن
ཿक
CMRR
min.
൮ఋ൮
ܕ
Ꮯૠ
ፊ
ݢ
Ꮯ
(
ꢁ
)
߇
ݢށ
ݢށ߇
ᅼ ુኒ
ݢ
Ꮯ ೊ
ݢ
ᅼ
(dB)
typ.
0.8
ᄲख
(MHz)
(mA)
(V)
(M
ꢁ
)
(V)
(
ꢁ
)
75/75
max.
1.2
50 to 1200
20
0.7
280
20
10
125
A
T
B2012-75011-T
ɐ
ك
ົֻ
ك
ჵ಼
ፊ
ݢ
Ꮯ
ુኒ
ݢ
Ꮯ
ن
ཿक
ই؉ཿक
ᄲख
4338A
4339A
E5071B
E5071B
E5071B
E5071B
٦ຟ
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Amplitude imbalance
Phase balance
ˆቂ݃
ك
ົֻȃ
൮ఋ࿅ᄹ
ن
ཿक
ই؉ཿक
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0
–5
–10
–15
–20
–25
–30
–35
–40
0
200
400
600
800
1000 1200
0
200
400
600
800
1000 1200
(
)
Frequency MHz
(
)
Frequency MHz
AMPLITUDE IMBALANCE
PHASE BALANCE
190
188
186
184
182
180
178
176
174
172
170
3.0
2.0
1.0
0
–1.0
–2.0
–3.0
0
200
400
600
800
1000 1200
0
200
400
600
800
1000 1200
(
)
Frequency MHz
(
)
Frequency MHz
·
ኵ๒ˈౚቧ
ࡻ
ܿଝ૰࡙ञ
ק
ˈขቧᇵ੍ȃ
001-01 / 20130722 / c751_woundbalun_atb.
(11/13)
R F
C o m p o n e n t s
A
T
B
Ⴜள
ᄲ
A
T
B2012E-75011M
ᄳᎫቪ
܄ڞ
2.0 0.2
1
4
2
3
0.4
1.2
0.4
Dimensions in mm
ထਃउധ
؝
ટ
ݢ
௸ဇ
Unbalanced Port
Balanced Port
2.7
1.2
75
ꢁ
75
ꢁ
1
2
4
3
Dimensions in mm
·
ኵ๒ˈౚቧ
ࡻ
ܿଝ૰࡙ञ
ק
ˈขቧᇵ੍ȃ
001-01 / 20130722 / c751_woundbalun_atb.
(12/13)
R F
C o m p o n e n t s
A
T
B
Ⴜளȁ
ᄲ
ATB2012E-75011M
ݢ
න࿅
ݞ
࿅
װࢆࣙݞ
UB/B
ن
ཿक
CMRR
min.
൮ఋ൮
ܕ
Ꮯૠ
ፊ
ݢ
Ꮯ
(
ꢁ
)max.
߇
ݢށ
ݢށ߇
ᅼ ુኒ
ݢ
Ꮯ
ೊ
ݢ
ᅼ
(V)
(dB)
typ.
1.0
ᄲख
(MHz)
(mA)
(V)
(M
ꢁ
)
(
ꢁ
)
75/75
max.
2
400 to 1800
15
0.5
150
20
10
125
A
T
B2012E-75011M-T
ɐ
ك
ົֻ
ك
ჵ಼
ፊ
ݢ
Ꮯ
ુኒ
ݢ
Ꮯ
ن
ཿक
ই؉ཿक
ᄲख
4338A
4339A
E5071B
E5071B
E5071B
E5071B
٦ຟ
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Agilent
T
e
chnologies
Amplitude imbalance
Phase balance
ˆቂ݃
ك
ົֻȃ
൮ఋ࿅ᄹ
ن
ཿक
ই؉ཿक
0
0
5
1
2
3
4
5
10
15
20
25
30
35
40
6
0
200 400 600 800
1000 1200 1400 1500 1800
0
200 400 600 800
1000 1200 1400 1500 1800
(
)
Frequency MHz
(
)
Frequency MHz
AMPLITUDE IMBALANCE
PHASE BALANCE
10
9
8
7
6
5
4
3
2
1
0
200
195
190
185
180
175
170
165
160
0
200 400 600 800
1000 1200 1400 1500 1800
0
200
400 600
800
1000 1200 1400 1500 1800
(
)
Frequency MHz
(
)
Frequency MHz
·
ኵ๒ˈౚቧ
ࡻ
ܿଝ૰࡙ञ
ק
ˈขቧᇵ੍ȃ
001-01 / 20130722 / c751_woundbalun_atb.
(13/13)
R F
C o m p o n e n t s
A
T
B
Ⴜள
֡Ꭷᄳ
શ
܄ڞ
2.0 0.5
A
W1
13
13.5
13
13.5
13
13.5
13
W2
60
100
60
100
60
100
60
N
9
10
9
10
9
10
9
ᄲ
ø180
ø330
ø180
ø330
ø180
ø330
ø180
ø330
ATB2012-50011
ATB2012-75011
A
T
B2012E-50011M
A
T
B2012E-75011M
13.5
100
10
1.0
ø13.0 0.2
ø21.0 0.8
W1
W2
A
Dimensions in mm
ף
܄ڞܕ
t
P2
P0
øD0
A
P1
B
K
Dimensions in mm
K t
A
øD0
E
F
P0
P1
P2
W
ᄲ
ATB2012-50011
ATB2012-75011
ATB2012E-50011M
ATB2012E-75011M
1.4 0.1
1.4 0.1
1.4 0.1
1.4 0.1
2.25 0.1
1.5+0.1/0 1.75
0.1 3.5
0.1
2.25 0.1
1.5+0.1/0 1.75
0.1 3.5
0.1
2.25 0.1
1.5+0.1/0 1.75
0.1 3.5
0.1
2.25 0.1
1.5+0.1/0 1.75
0.1 3.5
0.1
4.0 0.1
4.0 0.1
4.0 0.1
4.0 0.1
4.0 0.1
4.0 0.1
4.0 0.1
4.0 0.1
2.0 0.1
2.0 0.1
2.0 0.1
2.0 0.1
8.0 0.2
8.0 0.2
8.0 0.2
1.15 0.1
8.0 0.2
1.15 0.1
1.4 0.1
1.4 0.1
0.25 0.05
0.25 0.05
0.2 0.05
0.2 0.05
500 to 560min.
440min.
160min.
Taping
Drawing direction
Dimensions in mm
·
ኵ๒ˈౚቧ
ࡻ
ܿଝ૰࡙ञ
ק
ˈขቧᇵ੍ȃ
001-01 / 20130722 / c751_woundbalun_atb.
