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參數(shù)資料
| 型號(hào)： | AD660SQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Monolithic 16-Bit Serial/Byte DACPORT |
| 中文描述： | SERIAL, PARALLEL, 8 BITS INPUT LOADING, 2.5 us SETTLING TIME, 16-BIT DAC, CDIP24 |
| 封裝： | 0.300 INCH, CERDIP-24 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 426K |
| 代理商： | AD660SQ |
AD660
REV. A
–7–
BIPOLAR CONFIGURATION
The circuit shown in Figure 4a will provide a bipolar output
voltage from –10.000000 V to +9.999694 V with positive full
scale occurring with all bits ON. As in the unipolar mode, resis-
tors R1 and R2 may be eliminated altogether to provide AD660
bipolar operation without any external components. Eliminat-
ing these resistors will increase the gain error by 0.50% of FSR
in the bipolar mode.
16-BIT LATCH
16-BIT DAC
CONTROL
LOGIC
+10V REF
16-BIT LATCH
20
24
22
21
5
11
12
16
15
14
13
17
18
19
23
AD660
10k
10.05k
10k
HBE
LBE
CS
SIN/
DB0
MSB/LSB/
DB1
DB7
S
OUT
SPAN/
BIP OFF
V
OUT
REF OUT
REF IN
LDAC
CLR
SER
DGND
–V
EE
+V
CC
+V
LL
1
2
3
4
OUTPUT
R2 50
AGND
UNI/BIP CLR/
R1 50
Figure 4a.
±
10 V Bipolar Voltage Output
Gain offset and bipolar zero errors can be adjusted to zero us-
ing the circuit shown in Figure 4b as follows:
STEP I . . . OFFSET ADJUST
Turn OFF all bits. Adjust trimmer R2 to give 10.000000 volts
output.
STEP II . . . GAIN ADJUST
Turn all bits ON and adjust R1 to give a reading of +9.999694
volts.
STEP III . . . BIPOLAR ZERO ADJUST (Optional)
In applications where an accurate zero output is required, set
the MSB ON, all other bits OFF, and readjust R2 for zero volts
output.
16-BIT LATCH
16-BIT DAC
CONTROL
LOGIC
+10V REF
16-BIT LATCH
20
24
22
21
5
11
12
16
15
14
13
17
18
19
23
AD660
10k
10.05k
10k
HBE
LBE
CS
SIN/
DB0
MSB/LSB/
DB1
DB7
S
OUT
SPAN/
BIP OFF
V
OUT
REF OUT
REF IN
LDAC
CLR
SER
DGND
–V
EE
+V
CC
+V
LL
1
2
3
4
OUTPUT
R2
AGND
R1
100
UNI/BIP CLR/
Figure 4b.
±
10 V Bipolar Voltage Output with Gain and
Offset Adjustment
It should be noted that using external resistors will introduce a
small temperature drift component beyond that inherent in the
AD660. The internal resistors are trimmed to ratio-match and
temperature-track other resistors on chip, even though their ab-
solute tolerances are
±
20% and absolute temperature coeffi-
cients are approximately –50 ppm/
°
C . In the case that external
resistors are used, the temperature coefficient mismatch be-
tween internal and external resistors, multiplied by the sensitiv-
ity of the circuit to variations in the external resistor value, will
be the resultant additional temperature drift.
INTERNAL/EXTERNAL REFERENCE USE
The AD660 has an internal low noise buried Zener diode refer-
ence which is trimmed for absolute accuracy and temperature
coefficient. This reference is buffered and optimized for use in a
high speed DAC and will give long-term stability equal or supe-
rior to the best discrete Zener diode references. The perfor-
mance of the AD660 is specified with the internal reference
driving the DAC and with the DAC alone (for use with a preci-
sion external reference ).
The internal reference has sufficient buffering to drive external
circuitry in addition to the reference currents required for the
DAC (typically 1 mA to REF IN and 1 mA to BIPOLAR
OFFSET). A minimum of 2 mA is available for driving external
loads. The AD660 reference output should be buffered with an
external op amp if it is required to supply more than 4 mA total
current. The reference is tested and guaranteed to
±
0.2% max
error.
It is also possible to use external references other than 10 volts
with slightly degraded linearity specifications. The recom-
mended range of reference voltages is +5 V to +10.24 V, which
allows 5 V, 8.192 V and 10.24 V ranges to be used. For ex-
ample, by using the AD586 5 V reference, outputs of 0 V to
+5 V unipolar or
±
5 V bipolar can be realized. Using the
AD586 voltage reference makes it possible to operate the
AD660 with
±
12 V supplies with 10% tolerances.
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