Intel 8253 - Page 713

Philips Semiconductors Linear Products Product specification
DAC08 Series8-Bit high-speed multiplying D/A converter
August 31, 1994
721
TEST CIRCUITS (Continued)
Figure 3. Reference Current Slew Rate Measurement
5
6
7
8
9
10
11
12
3
13
14
15
1
2
4
16
DAC-08
V
EE
V
CC
0.1µF
OPEN
SCOPE
R
EQ
= 200Ω
R
L
R
P
1k
R
IN
V
IN
dI
dt

I
R
L
dV
dt
SLEWING TIME
10%
90%
0
2.0mA
2V
0
Figure 4. Notation Definitions
NOTES:
(See text for values of C.)
Typical values of R
14
= R
15
= 1k
V
REF
= +2.0V
C = 15pF
V
I
and I
I
apply to inputs A
1
through A
8
The resistor tied to Pin 15 is to temperature compensate the bias current and may not be necessary for all applications.
I
O
 K

A
1
2

A
2
4

A
3
8

A
4
16

A
5
32

A
6
64

A
7
128

A
8
256

where K 
V
REF
R
14
and A
N
= ‘1’ if A
N
is at High Level
A
N
= ‘0’ if A
N
is at Low Level
5
6
7
8
9
10
11
12
3
13
14
15
1
2
4
16
DAC-08
V
CC
DIGITAL
INPUTS
OUTPUT
I
CC
V
O
V
REF
(+)
I
O
R
L
C
V
EE
I
EE
V
I
I
I
(+)
R
15
R
14
I
15
I
14
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8