AD7846 Analog Devices, AD7846 Datasheet - Page 5

• Manufacturer Part Number: AD7846
• Description: 16-Bit Voltage Output CMOS DAC
• Manufacturer: Analog Devices

Specifications of AD7846

• Resolution (bits): 16bit
• Dac Update Rate: 143kSPS
• Dac Settling Time: 7µs
• Max Pos Supply (v): +15.75V
• Single-supply: No
• Dac Type: Voltage Out
• Dac Input Format: Par

TIMING CHARACTERISTICS
V
Table 3.
Parameter
t
t
t
t
t
t
t
t
t
t
t
t
1
2
3
1
2
3
4
5
6
7
8
9
10
11
12
Timing specifications are sample tested at +25°C to ensure compliance. All input control signals are specified with t
voltage level of 1.6 V.
t
t
2
3
6
7
DD
is measured with the load circuits of Figure 3 and Figure 4 and defined as the time required for an output to cross 0.8 V or 2.4 V.
is defined as the time required for an output to change 0.5 V when loaded with the circuits of Figure 5 and Figure 6.
= +14.25 V to +15.75 V, V
Figure 4. Load Circuits for Bus Relinquish Time (t
Figure 3. Load Circuit for Access Time (t
1
DBn
Limit at T
0
60
0
60
0
120
10
60
0
70
0
70
130
DBn
3kΩ
DGND
SS
MIN
5V
= −14.25 V to −15.75 V, V
3kΩ
100pF
DGND
to T
LDAC
DB15
DB0
CLR
MAX
R/W
CS
100pF
TO
6
)—High Z to V
(All Versions)
6
)—High Z to V
t
1
t
8
DATA VALID
t
OH
4
t
t
2
9
OL
Figure 2. Timing Diagram
CC
Rev. G | Page 5 of 24
= +4.75 V to +5.25 V, unless otherwise noted.
t
t
5
10
t
3
t
1
t
8
Unit
ns min
ns min
ns min
ns min
ns min
ns max
ns min
ns max
ns min
ns min
ns min
ns min
ns min
t
6
t
12
t
DATA VALID
9
Figure 6. Load Circuits for Bus Relinquish Time (t
Figure 5. Load Circuit for Access Time (t
t
10
t
3
t
7
DBn
t
11
R
= t
5V
0V
5V
0V
5V
0V
5V
0V
5V
0V
DBn
F
Test Conditions/Comments
R/W to CS setup time
CS pulse width (write cycle)
R/W to CS hold time
Data setup time
Data hold time
Data access time
Bus relinquish time
CLR setup time
CLR pulse width
CLR hold time
LDAC pulse width
CS pulse width (read cycle)
= 5 ns (10% to 90% of +5 V) and timed from a
3kΩ
DGND
5V
3kΩ
10pF
DGND
10pF
7
)—High Z to V
7
)—High Z to V
AD7846
OH
OL