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參數(shù)資料
| 型號(hào)： | AD768-EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit, 30 MSPS D/A Converter |
| 中文描述： | 16位，30 MSPS的D / A轉(zhuǎn)換 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 334K |
| 代理商： | AD768-EB |
REV. B
–6–
AD768
I
REFIN
– mA
P
550
500
300
1.0
7.0
2.0
3.0
4.0
5.0
6.0
450
400
350
Figure 3. Power Dissipation vs. I
REFIN
Current
Note the AD768 is optimized for operation at an input current
of 5 mA. Both linearity and dynamic performance at other input
currents may be somewhat degraded. Figure 4 shows typical dc
linearity over a range of input currents. Figure 5 shows typical
SFDR (to Nyquist) performance over a range of input currents
and CLOCK input rates for a 1 MHz output frequency.
E
I
REFIN
– mA
10
0
1.0
7.0
2.0
3.0
4.0
5.0
6.0
9
6
3
2
1
8
7
5
4
INL
DNL
Figure 4. INL/DNL vs. I
REFIN
Current
I
REFIN
– mA
S
–85
–55
1.0
7.0
2.0
3.0
4.0
5.0
6.0
–80
–75
–70
–65
–60
CLOCK = 10 MSPS
CLOCK = 20 MSPS
CLOCK = 30 MSPS
CLOCK = 40 MSPS
Figure 5. SFDR (to Nyquist) vs. I
REFIN
@ F
OUT
= 1 MHz
DAC T RANSFE R FUNCT ION
T he AD768 may be used in either current-output mode with the
output connected to a virtual ground, or voltage-output mode
with the output connected to a resistive load.
In current output mode,
I
OUT
= (DAC CODE/65536)
×
(I
REFIN
×
4)
In voltage output mode,
V
OUT
= I
OUT
×
R
LOAD
i
R
LAD
where:
DAC CODE
is the decimal representation of the DAC inputs;
an integer between 0 and 65535.
I
REFIN
is the current applied at the IREFIN
pin, determined by
V
REF
/R
REF
.
Substituting for I
OUT
and
I
REFIN
,
V
OUT
= –V
REF
×
(
DAC CODE/65536
)
×
4
×
[
(R
LOAD
i
R
LAD
)
/
R
REF
]
T hese equations clarify an important aspect of the AD768
transfer function; the full-scale current output of the DAC is
proportional to a current input. T he voltage output is then a
function of the ratio of (R
LOAD
i
R
LAD
)/R
REF
, allowing for cancel-
lation of resistor drift by selection of resistors with matched
characteristics.
RE FE RE NCE INPUT
T he IREFIN
pin is a current input node with low impedance to
REFCOM. T his input current sets the magnitude of the DAC
current sources such that the full-scale output current is exactly
four times the current applied at IREFIN. For the nominal in-
put current of 5 mA, the nominal full-scale output current is
20 mA.
T he 5 mA reference input current can be generated from the
on-chip 2.5 V reference with an external resistor of 500
from
REFOUT to IREFIN. If desired, a variety of external reference
voltages may be used based on the selection of an appropriate
resistor. However, to maintain stability of the reference ampli-
fier, the external impedance at IREFIN must be kept below
1 k
.
5
6
REFCOM
IREFIN
V
EE
V
EE
IFB
5mA
Figure 2. Equivalent Reference Input Circuit
T he I
REFIN
current can be varied from 1 mA to 7 mA which
subsequently will result in a proportional change in the DAC
full-scale. Since the operating currents within the DAC vary
with I
REFIN
, so does the power dissipation. Figure 3 illustrates
that relationship.
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|---|---|
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