AD7801 查看數據表（PDF） - Analog Devices
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AD7801 Datasheet PDF : 16 Pages
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800
720 VDD = 5V AND 3V
INTERNAL REFERENCE
640 TA = +25 C
DAC LOADED WITH 00HEX
560
480
400
320
240
160
80
0
0
2
4
6
8
SINK CURRENT – mA
Figure 2. Output Sink Current Capa-
bility with VDD = 3 V and VDD = 5 V
0.5
0.45
0.4
VDD = 5V
TA = +25 C
0.35
0.3
INL ERROR
0.25
0.2
0.15
DNL ERROR
0.1
0.05
0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8
REFERENCE VOLTAGE – Volts
Figure 5. Relative Accuracy vs.
External Reference
10
5
0
–5
–10
–15
–20
–25
–30
VDD = 5V
EXTERNAL SINEWAVE REFERENCE
–35
DAC REGISTER LOADED WITH FFHEX
TA = +25°C
–40
1
10
100
1k
10k
FREQUENCY – Hz
Figure 8. Large Scale Signal
Frequency Response
Typical Performance Characteristics–AD7801
5
4.92
4.84
4.76
4.68
4.6
4.52
4.44
VDD = 5V
INTERNAL REFERENCE
4.36
DAC REGISTER LOADED
WITH FFHEX
4.28 TA = +25°C
4.2
0
2
4
6
8
SOURCE CURRENT – mA
3.5
3.25
3.0
2.75
2.5
2.25
2.0
1.75 VDD = 3V
INTERNAL REFERENCE
1.5 DAC REGISTER LOADED
WITH FFHex
1.25 TA = +25°C
1.0
0 1 2 34 5 6 7 8
SOURCE CURRENT – mA
Figure 3. Output Source Current
Capability with VDD = 5 V
4.0
INTERNAL REFERENCE
3.5
LOGIC INPUTS = VDD OR GND
DAC ACTIVE
3.0
2.5
2.0
VDD = 5.5V
1.5
1.0
VDD = 3.3V
0.5
0
–50 –25 0
25 50 75 100 125
TEMPERATURE – C
Figure 4. Output Source Current
Capability with VDD = 3 V
4.0
DAC ACTIVE
INTERNAL REFERENCE
TA = +25°C
3.0 LOGIC INPUTS = VIH OR VIL
2.0
LOGIC INPUTS = VDD OR GND
1.0
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VDD – Volts
Figure 6. Typical Supply Current
vs. Temperature
Figure 7. Typical Supply Current
vs. Supply Voltage
WR
T
1
2
VOUT
VOUT
←
VDD = 3V
INTERNAL VOLTAGE
REFERENCE
FULL SCALE CODE
3
CHANGE 00H-FFH
TA = +25°C
CH1 5V, CH2 1V, CH3 20mV
TIME BASE = 200 ns/Div
Figure 9. Full-Scale Settling Time
PD
2←
VOUT
1
AD7801 POWER-UP TIME
VDD = 5V
INTERNAL REFERENCE
DAC IN POWER-DOWN INITIALLY
CH1 = 2V/div, CH2 = 5V/Div,
TIME BASE = 2 µs/Div
Figure 10. Exiting Power-Down (Full
Power-Down)
REV. 0
–5–
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