Typical Performance Characteristics– AD7801
800
720
640
560
V
OUT
– mV
480
400
320
240
160
80
0
0
2
4
6
SINK CURRENT – mA
8
V
DD
= 5V AND 3V
INTERNAL REFERENCE
T
A
= +25 C
DAC LOADED WITH 00HEX
5
4.92
4.84
4.76
3.5
3.25
3.0
2.75
V
OUT
– Volts
V
OUT
– Volts
4.68
4.6
4.52
4.44
4.36
4.28
4.2
0
V
DD
= 5V
INTERNAL REFERENCE
DAC REGISTER LOADED
WITH FFHEX
T
A
= +25°C
2
4
6
SOURCE CURRENT – mA
8
2.5
2.25
2.0
1.75
1.5
1.25
1.0
0
V
DD
= 3V
INTERNAL REFERENCE
DAC REGISTER LOADED
WITH FFHex
T
A
= +25°C
1
2
3
4
5
6
SOURCE CURRENT – mA
7
8
Figure 2. Output Sink Current Capa-
bility with V
DD
= 3 V and V
DD
= 5 V
0.5
0.45
0.4
V
DD
= 5V
T
A
= +25 C
Figure 3. Output Source Current
Capability with V
DD
= 5 V
4.0
3.5
3.0
INTERNAL REFERENCE
LOGIC INPUTS = V
DD
OR GND
DAC ACTIVE
Figure 4. Output Source Current
Capability with V
DD
= 3 V
4.0
DAC ACTIVE
INTERNAL REFERENCE
T
A
= +25°C
3.0
LOGIC INPUTS = V
IH
OR V
IL
0.35
ERROR – LSBs
0.3
0.25
0.2
0.15
I
DD
– mA
2.0
1.5
1.0
0.5
0
–50
–25
V
DD
= 5.5V
I
DD
– mA
INL ERROR
2.5
2.0
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
V
DD
= 3.3V
1.0
LOGIC INPUTS = V
DD
OR GND
0
25
50
75
TEMPERATURE – C
100
125
0
2.5
3.0
3.5
4.0
4.5
V
DD
– Volts
5.0
5.5
Figure 5. Relative Accuracy vs.
External Reference
10
5
0
ATTENUATION – dB
–5
–10
–15
–20
–25
–30
–35
–40
1
V
DD
= 5V
EXTERNAL SINEWAVE REFERENCE
DAC REGISTER LOADED WITH FFHEX
T
A
= +25°C
10
100
1k
FREQUENCY – Hz
10k
Figure 6. Typical Supply Current
vs. Temperature
Figure 7. Typical Supply Current
vs. Supply Voltage
WR
1
←
T
PD
2←
2
←
V
OUT
V
OUT
←
3
←
V
DD
= 3V
INTERNAL VOLTAGE
REFERENCE
FULL SCALE CODE
CHANGE 00H-FFH
T
A
= +25°C
CH1 5V, CH2 1V, CH3 20mV
TIME BASE = 200 ns/Div
1
←
V
OUT
AD7801 POWER-UP TIME
V
DD
= 5V
INTERNAL REFERENCE
DAC IN POWER-DOWN INITIALLY
CH1 = 2V/div, CH2 = 5V/Div,
TIME BASE = 2
µs/Div
Figure 8. Large Scale Signal
Frequency Response
Figure 9. Full-Scale Settling Time
Figure 10. Exiting Power-Down (Full
Power-Down)
REV. 0
–5–
AD [ ANALOG DEVICES ]
