參數(shù)資料
型號(hào)： AD7224TQ
廠商： ANALOG DEVICES INC
元件分類： DAC
英文描述： ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84%
中文描述： PARALLEL, 8 BITS INPUT LOADING, 8-BIT DAC, CDIP18
封裝： CERDIP-18
文件頁(yè)數(shù)： 7/8頁(yè)
文件大小： 228K
代理商： AD7224TQ
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
相關(guān)PDF資料
PDF描述
AD7224UE LC2MOS 8-Bit DAC with Output Amplifiers
AD7224UQ LC2MOS 8-Bit DAC with Output Amplifiers
AD7225UQ LC2MOS Quad 8-Bit DAC with Separate Reference Inputs
AD7225KN LC2MOS Quad 8-Bit DAC with Separate Reference Inputs
AD7225KP LC2MOS Quad 8-Bit DAC with Separate Reference Inputs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7224TQ/883B 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Digital-to-Analog Converter
AD7224UD 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Digital-to-Analog Converter
AD7224UE 制造商:AD 功能描述:7224
AD7224UE/883B 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Digital-to-Analog Converter
AD7224UQ 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS 8-Bit DAC with Output Amplifiers
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*