參數(shù)資料
型號(hào): AD558JP
廠商: ANALOG DEVICES INC
元件分類(lèi): DAC
英文描述: DACPORT Low Cost, Complete uP-Compatible 8-Bit DAC
中文描述: PARALLEL, 8 BITS INPUT LOADING, 0.8 us SETTLING TIME, 8-BIT DAC, PQCC20
封裝: PLASTIC, LCC-20
文件頁(yè)數(shù): 7/8頁(yè)
文件大小: 334K
代理商: AD558JP
AD558
REV. A
–7–
OUTPUT
AMP
16
15
14
13
AGND
V
OUT
SELECT
V
OUT
SENSE
V
OUT
–V
0.5mA
b. 0 V to 10 V Output Range
Figure 11. Offset Connection Diagrams
INTERFACING THE AD558 TO MICROPROCESSOR
DATA BUSES
The AD558 is configured to act like a “write only” location in
memory that may be made to coincide with a read only memory
location or with a RAM location. The latter case allows data
previously written into the DAC to be read back later via the
RAM. Address decoding is partially complete for either ROM
or RAM. Figure 12 shows interfaces for three popular micropro-
cessor systems.
ADDRESS BUS
DATA BUS
6800
VMA
φ
2
R/W
AD558
V
OUT
DB0–DB7
16
8
8
CE
CS
ADDRESS
DECODER
16
R/W
CE
GATED DECODED ADDRESS
CS
a. 6800/AD558 Interface
ADDRESS BUS
DATA BUS
8080A
AD558
V
OUT
DB0–DB7
16
8
8
CE
CS
ADDRESS SELECT
PULSE LOGIC
16
MEMW
MEMW
CE
DECODED ADDRESS SELECT PULSE
CS
b. 8080A/AD558 Interface
ADDRESS BUS
DATA BUS
1802
AD558
V
OUT
DB0–DB7
8
8
8
CE
CS
ADDRESS
LATCH
&
DECODE
8
MWR
CDP 1802: MWR
CE
DECODED ADDRESS SELECT PULSE
CS
TPA
MA 0 – 7
c. 1802/AD558 Interface
Figure 12. Interfacing the AD558 to Microprocessors
Performance
(typical @ +25
8
C, V
CC
6
+5 V to +15 V unless otherwise noted)
0
LSB
1.75
1.50
1.25
1.00
0.75
0.50
0.25
–0.25
–0.50
–0.75
–1.00
–55
–25
0
+25
+50
+75
+100
+125
oC
FULL
SCALE
ERROR
ALL AD558
AD558S, T
1LSB = 0.39% OF FULL SCALE
Figure 13. Full-Scale Accuracy vs. Temperature
Performance of AD558
0
LSB
1/2
1/4
–55
–25
0
+25
+50
+75
+100
+125
oC
ZERO
ERROR
ALL AD558
AD558S, T
1LSB = 0.39% OF FULL SCALE
–1/4
–1/2
Figure 14. Zero Drift vs. Temperature Performance
of AD558
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