AD679AD Analog Devices Inc, AD679AD Datasheet - Page 4

• Manufacturer Part Number: AD679AD
• Description: IC ADC 14BIT SAMPLING 28-CDIP
• Manufacturer: Analog Devices Inc

Specifications of AD679AD

• Rohs Status: RoHS non-compliant
• Number Of Bits: 14
• Sampling Rate (per Second): 128k
• Data Interface: Parallel
• Number Of Converters: 2
• Power Dissipation (max): 745mw
• Voltage Supply Source: Analog and Digital, Dual ±
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 28-CDIP (0.600", 15.24mm)

AD679
TIMING SPECIFICATIONS
Parameter
SC Delay
Conversion Time
Conversion Rate
Convert Pulse Width
Aperture Delay
Status Delay
Access Time
Float Delay
Output Delay
Format Setup
OE Delay
Read Pulse Width
Conversion Delay
EOCEN Delay
NOTES
1
2
3
4
5
Specifications subject to change without notice.
Includes acquisition time.
Measured from the falling edge of OE/EOCEN (0.8 V) to the time at which the
C
C
Measured from the rising edge of OE/EOCEN (2.0 V) to the time at which the output voltage changes by 0.5. See Figure 4; C
data lines/EOC cross 2.0 V or 0.8 V. See Figure 4.
= 10 pF.
OUT
OUT
= 100 pF.
= 50 pF.
NOTES
1
SEE THE START CONVERSION TRUTH TABLE FOR DETAILS.
2
STATE OUTPUT. IN ASYNCHRONOUS MODE, EOC IS AN OPEN DRAIN OUTPUT.
3
IN ASYNCHRONOUS MODE, STATE OF CS DOES NOT AFFECT OPERATION.
EOCEN = LOW (SEE FIGURE 3). IN SYNCHRONOUS MODE, EOC IS A THREE-
DATA SHOULD NOT BE ENABLED DURING A CONVERSION.
5
2, 3
Figure 1. Conversion Timing
1
Figure 2. Output Timing
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
SC
C
CR
CP
AD
SD
BA
FD
OD
FS
OE
RP
CD
EO
(All device types T
5%, V
DD
= +5 V
Min
50
0.097
5
0
10
10
10
100
20
195
400
50
MIN
to T
10%)
MAX
–4–
, V
CC
= +12 V
Figure 4. Load Circuit for Bus Timing Specifications
Max
6.3
7.8
3.0
20
400
100
57
80
0
4
TEST
ACCESS TIME HIGH Z TO LOGIC LOW 5V
FLOAT TIME LOGIC HIGH TO HIGH Z
ACCESS TIME HIGH Z TO LOGIC HIGH
FLOAT TIME LOGIC LOW TO HIGH Z
NOTE
1
AND AN OPEN DRAIN OUTPUT IN ASYNCHRONOUS. ACCESS (t
AND FLOAT (t
ASYNCHRONOUS MODE WHERE THEY ARE A FUNCTION OF THE
TIME CONSTANT FORMED BY THE 10pF OUTPUT CAPACITANCE
AND THE PULL-UP RESISTOR.
EOC IS A THREE-STATE OUTPUT IN SYNCHRONOUS MODE
5%, V
EE
FD
D
OUT
) TIMING SPECIFICATIONS DO NOT APPLY IN
= –12 V
Figure 3. EOC Timing
C
Unit
ns
µs
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
OUT
OUT
I
I
OL
OH
V
100pF
0V
0V
5V
V
CP
CP
C
10pF
100pF
10pF
OUT
BA
)
REV. D