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參數(shù)資料
| 型號： | AD7224LR-18 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | LC2MOS 8-Bit DAC with Output Amplifiers |
| 中文描述： | PARALLEL, 8 BITS INPUT LOADING, 8-BIT DAC, PDSO18 |
| 封裝： | SOIC-18 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 228K |
| 代理商： | AD7224LR-18 |
AD7224
REV. B
–7–
BIPOLAR OUT PUT OPE RAT ION
T he AD7224 can be configured to provide bipolar output op-
eration using one external amplifier and two resistors. Figure 6
shows a circuit used to implement offset binary coding. In this
case
V
O
=
1
+
R
2
R
1
With
R
1 =
R
2
V
O
= (2
D
– 1)
V
REF
where
D
is a fractional representation of the digital word in
the DAC register.
Mismatch between R1 and R2 causes gain and offset errors;
therefore, these resistors must match and track over tempera-
ture. Once again, the AD7224 can be operated in single supply
or from positive/negative supplies. T able III shows the digital
code versus output voltage relationship for the circuit of Figure
6 with R1 = R2.
·
D
V
REF
(
)
±
R
2
R
1
·
V
REF
(
)
+15V
+15V
V
REF
R1
R2
V
OUT
R1, R2 = 10k
±
0.1%
DAC
DB7
DB0
CS
WR
LDAC
RESET
3
V
DD
V
REF
V
SS
AGND
DGND
AD7224
V
OUT
DATA
(8-BIT)
Figure 6. Bipolar Output Circuit
T able III. Bipolar (Offset Binary) Code T able
DAC Register Contents
MSB
LSB
Analog Output
1 1 1 1
1 1 1 1
+
V
REF
+
V
REF
127
128
1
128
1 0 0 0
0 0 0 1
1 0 0 0
0 0 0 0
0 V
0 1 1 1
1 1 1 1
±
V
REF
±
V
REF
1
128
127
128
128
128
±
V
REF
0 0 0 0
0 0 0 1
±
V
REF
0 0 0 0
0 0 0 0
AGND BIAS
T he AD7224 AGND pin can be biased above system GND
(AD7224 DGND) to provide an offset “zero” analog output
voltage level. Figure 7 shows a circuit configuration to achieve
this. T he output voltage, V
OUT
, is expressed as:
V
OUT
=
V
BIAS
+
D
(
V
IN
)
where
D
is a fractional representation of the digital word in
DAC register and can vary from 0 to 255/256.
For a given V
IN
, increasing AGND above system GND will re-
duce the effective V
DD
–V
REF
which must be at least 4 V to en-
sure specified operation. Note that V
DD
and V
SS
for the AD7224
must be referenced to DGND.
DAC
V
DD
V
REF
V
SS
AGND
DGND
AD7224
V
OUT
V
IN
V
IN
V
BIAS
Figure 7. AGND Bias Circuit
MICROPROCE SSOR INT E RFACE
8088
A15
A8
ALE
AD0
AD7
DECODE
LATCH
EN
AD7224*
WR
WR
DB7
DB0
LDAC
ADDRESS BUS
ADDRESS DATA BUS
*LINEAR CIRCUITRY OMITTED FOR CLARITY
CS
Figure 8. AD7224 to 8085A/8088 Interface
D0
D7
DATA BUS
*LINEAR CIRCUITRY OMITTED FOR CLARITY
E OR
φ
2
D0
D7
E OR
φ
2
R/W
A15
A0
6809
DECODE
EN
ADDRESS BUS
LDAC
AD7224*
WR
CS
DB7
DB0
Figure 9. AD7224 to 6809/6502 Interface
Z-80
A15
A0
D0
D7
AD7224*
WR
DB7
DB0
LDAC
ADDRESS BUS
DATA BUS
*LINEAR CIRCUITRY OMITTED FOR CLARITY
DECODE
CS
WR
Figure 10. AD7224 to Z-80 Interface
68008
A23
A1
D0
D7
AD7224*
DB7
DB0
LDAC
WR
ADDRESS BUS
DATA BUS
*LINEAR CIRCUITRY OMITTED FOR CLARITY
DECODE
CS
R/W
DTACK
Figure 11. AD7224 to 68008 Interface
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