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參數(shù)資料
| 型號(hào)： | 05F8025 |
| 英文描述： | IC-SM-QUAD 12 BIT DAC |
| 中文描述： | 集成電路釤四路12位DAC |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 502K |
| 代理商： | 05F8025 |
DAC8412/DAC8413
REV. C
–8–
found that this is large enough to stabilize this circuit. Larger
resistor values are acceptable, provided that the drop across the
resistor doesn’t exceed a VBE. Assuming a minimum VBE of 0.6
volts and a maximum current of 2.75 mA, then the resistor
should be under 200
for the loading of a single DAC8412.
Using two separate references is not recommended. Having two
references could cause different drifts with time and tempera-
ture; whereas with a single reference, most drifts will track.
Unipolar positive full-scale operation can usually be set with a
reference with the correct output voltage. This is preferable to
using a reference and dividing down to the required value. For a
10 volt full-scale output, the circuit can be configured as shown in
Figure 2. In this configuration the full-scale value is set first by
adjusting the 10 k
resistor for a full-scale output of
9.9976 volts.
REF08
DAC8412
OR
DAC8413
–15V
TRIM
10k
V REFH
0.2
F
V REFL
ZERO TO –10V OPERATION
GND
.01
F
10
F
OUT
Figure 4. Unipolar –10 V Operation
Figure 4 shows the DAC8412 configured for –10 volt to zero
volt operation. A REF08 with a –10 volt output is connected
directly to VREFL for the reference voltage.
Single +5 Volt Supply Operation
For operation with a +5 volt supply, the reference should be set
between 1.0 and +2.5 volts for optimum linearity. Note that
lower reference voltages will have greater effects due to noise.
Figure 5 shows a REF43 used to supply a +2.5 volt reference
voltage. The headroom of the reference and DAC are both suf-
ficient to support a +5 volt supply with
±5% tolerance. V
DD and
VLOGIC should be connected to the same supply and separate
bypassing to each pin should be used.
REF43
DAC8412
OR
DAC8413
+5V
TRIM
10k
V REFH
0.2
F
V REFL
ZERO TO +2.5V OPERATION
SINGLE +5V SUPPLY
GND
0.01
F
10
F
OUTPUT
INPUT
Figure 5. +5 V Single Supply Operation
+1
–1
6
0
12
11
10
9
8
7
MAXIMUM
LINEARITY
ERROR
–
LSB
V
– Volts
REFH
V
= +15V
V
= –15V
V
= –10.0V
T = +25C
DD
REFL
A
SS
Differential Linearity vs. VREFH
MAXIMUM
LINEARITY
ERROR
–
LSB
V
– Volts
REFH
0
–2
–1
+2
+1
3
2
1
V
= +5V
V
= 0V
V
= 0V
T = +25C
DD
SS
REFL
A
Differential Linearity vs. VREFH
MAXIMUM
LINEARITY
ERROR
–
LSB
V
– Volts
REFH
0.3
0.1
0.2
10
8
6
12
V
= +15V
V
= –15V
V
= 0V
T = +25C
DD
SS
REFL
A
INL vs. VREFH
Typical Performance Characteristics
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