參數(shù)資料
型號： AD7801BRU
廠商： ANALOG DEVICES INC
元件分類： DAC
英文描述： +2.7 V to +5.5 V, Parallel Input, Voltage Output 8-Bit DAC
中文描述： PARALLEL, 8 BITS INPUT LOADING, 1.2 us SETTLING TIME, 8-BIT DAC, PDSO20
封裝： TSSOP-20
文件頁數(shù)： 5/16頁
文件大?。?/td> 219K
代理商： AD7801BRU
AD7801
–5–
REV. 0
SINK CURRENT – mA
V
O
800
00
8
2
4
6
720
400
240
160
80
640
560
320
480
V
= 5V AND 3V
INTERNAL REFERENCE
T
= +25 C
DAC LOADED WITH 00HEX
Figure 2. Output Sink Current Capa-
bility with V
DD
= 3 V and V
DD
= 5 V
REFERENCE VOLTAGE – Volts
E
0.5
01.0 1.2
2.8
1.4
1.6
1.8
2.2
2.4
2.6
2.0
0.45
0.25
0.15
0.1
0.05
0.4
0.35
0.2
0.3
V
DD
= 5V
T
A
= +25 C
INL ERROR
DNL ERROR
Figure 5. Relative Accuracy vs.
External Reference
FREQUENCY – Hz
A
1
10
10k
100
1k
10
5
–40
0
–5
–10
–15
–20
–25
–30
–35
V
= 5V
EXTERNAL SINEWAVE REFERENCE
DAC REGISTER LOADED WITH FFHEX
T
A
= +25
°
C
Figure 8. Large Scale Signal
Frequency Response
Typical Performance Characteristics–
SOURCE CURRENT – mA
V
O
V
0
2
8
4
6
5
4.92
4.2
4.84
4.76
4.68
4.6
4.52
4.44
4.36
4.28
V
= 5V
INTERNAL REFERENCE
DAC REGISTER LOADED
WITH FFHEX
T
A
= +25
°
C
Figure 3. Output Source Current
Capability with V
DD
= 5 V
–50
–25
100
TEMPERATURE – C
3.5
2.0
I
D
4.0
3.0
2.5
INTERNAL REFERENCE
LOGIC INPUTS = V
DD
OR GND
DAC ACTIVE
V
DD
= 5.5V
V
DD
= 3.3V
1.5
1.0
0.5
0
0
25
50
75
125
Figure 6. Typical Supply Current
vs. Temperature
T
←
V
OUT
V
= 3V
INTERNAL VOLTAGE
REFERENCE
FULL SCALE CODE
CHANGE 00H-FFH
T
A
= +25
°
C
1
3
2
V
OUT
CH1 5V, CH2 1V, CH3 20mV
TIME BASE = 200 ns/Div
WR
Figure 9. Full-Scale Settling Time
SOURCE CURRENT – mA
3.5
1.0
0
1
8
2
3
4
5
6
7
3.25
2.5
2.25
1.75
1.25
3.0
2.75
2.0
1.5
V
O
–
V
= 3V
INTERNAL REFERENCE
DAC REGISTER LOADED
WITH FFHex
T
A
= +25
°
C
Figure 4. Output Source Current
Capability with V
DD
= 3 V
V
DD
– Volts
I
D
3.0
1.0
4.0
2.5
3.0
5.5
3.5
4.0
4.5
5.0
LOGIC INPUTS = V
DD
OR GND
LOGIC INPUTS = V
IH
OR V
IL
DAC ACTIVE
INTERNAL REFERENCE
T
A
= +25
°
C
2.0
0
Figure 7. Typical Supply Current
vs. Supply Voltage
PD
V
OUT
AD7801 POWER-UP TIME
V
= 5V
INTERNAL REFERENCE
DAC IN POWER-DOWN INITIALLY
1
←
2
←
CH1 = 2V/div, CH2 = 5V/Div,
TIME BASE = 2
μ
s/Div
Figure 10. Exiting Power-Down (Full
Power-Down)
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PDF描述
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