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MC1408-8D 데이터시트(PDF) 7 Page - ON Semiconductor

부품명 MC1408-8D
상세설명  8?뭕it Multiplying D/A Converter
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
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MC1408-8D 데이터시트(HTML) 7 Page - ON Semiconductor

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MC1408−8
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7
Monotonicity
A monotonic converter is one which always provides an
analog output greater than or equal to the preceding value for
a corresponding increment in the digital input code. The
MC1408−8 is monotonic for all values of reference current
above 0.5 mA. The recommended range for operation is a
DC reference current between 0.5 mA and 4.0 mA.
Settling Time
The worst case switching condition occurs when all bits
are switched on, which corresponds to a low−to−high
transition for all input bits. This time is typically 70 ns for
settling to within 1/2LSB for 8−bit accuracy. This time
applies when RL < 500
W and CO < 25 pF. The slowest single
switch is the least significant bit, which typically turns on
and settles in 65 ns. In applications where the D−to−A
converter functions in a positive going ramp mode, the
worst−case condition does not occur and settling times less
than 70 ns may be realized.
Extra care must be taken in board layout since this usually
is the dominant factor in satisfactory test results when
measuring settling time. Short leads, 100
mF supply
bypassing for low frequencies, minimum scope lead length,
good ground planes, and avoidance of ground loops are all
mandatory.
5
6
7
8
9
10
11
12
3
MC1408
13
14
15
1
2
4
16
CO ≤ 25pF
R14
0.1
mF
RL
eIN
VEE
VCC
15pF
0.1
mF
0.1
mF
eO
FOR SETTLING TIME
MEASUREMENT
(ALL BITS
SWITCHED LOW
TO HIGH)
2.4V
0.4V
1.0V
SETTLING TIME
0
0
TRANSIENT
RESPONSE
−100
mV
FOR TURN OFF
MEASUREMENT
USE RL to GND
1.4V
RL = 50W
PIN 4 TO GND
tS = 70ns TYPICAL
TO
±1/2LSB
tPLH
tPHL
tPHL = tPLH = 10ns
RL = 500W
eIN
+2VDC
Figure 6. Transient Response and Settling Time
INPUTS
5
6
7
8
9
10
11
12
3
MC1408
13
14
15
1
2
4
16
VEE
VCC
I
O +
K
A
1
2
)
A
2
4
)
A
3
8
)
A
4
16
)
A
5
32
)
A
6
64
)
A
7
128
)
A
8
256
where K
+
V
REF
R
14
and AN = “1” IF AN IS AT HIGH LEVEL
AN = “0” IF AN IS AT LOW LEVEL
DIGITAL
IEE
IO
I15
I14
R14
R15
VO
OUTPUT
RL
VI
II
(+)
ICC
VREF(+)
(SEE TEXT FOR VALUES OF C)
TYPICAL VALUES R14 = R15 = 1k
VREF = +2.0V
C = 15pF
A1
A2
A3
A4
A5
A6
A7
A8
Figure 7. Notation Definitions
VI AND II APPLY TO INPUTS A1 THROUGH A8
THE RESISTOR TIED TO PIN 15 IS TO TEMPERATURE
COMPENSATE THE BIAS CURRENT AND MAY NOT BE
NECESSARY FOR ALL APPLICATIONS
1.0k
W
1.0k
W
51
W


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