DAC8512 Datasheet, PDF (12/20 Pages) Analog Devices – % V, Serial Input Complete 12-Bit DAC

DAC8512
R1
100k
R2
5kΩ
+15V
7
17
0.1µF
6
18
12
AMP05
10
8
1
9
11
2
5
4 _P1
100kΩ
0.1µF
R_CS
100Ω
0mA ≤ I_OUT ≤ 10mA
2.4µA/ BIT
OP295’s feedback loop. For the circuit values shown, the full-
scale output current is 1 mA which is given by the following
equation:
I_OUT =
DW × 4.095V
R1
where DW = DAC8512’s binary digital input code.
+5V
0.1µF
V_S
1
CS
2
CLR 6 ^DAC8512FP
LOAD
+5V
+15V
0.1µF
–15V
2
REF02 6
0.1µF
4
1
CS
2
CLR 6 _DAC8512FZ
R3
3k
LD
5
8
R4
SCLK
3
1k
SDI
4
7
LD
5
8
3
SCLK
3
A1 1
2N2222
SDI
4
2
7
A1 = 1/2 OP295
R1
4.02kΩ
P1
200Ω
FULL-SCALE
ADJUST
Figure 32. A Single-Supply, Programmable Current
Source
The usable output voltage range of the current sink is +5 V to
+60 V. The low limit of the range is controlled by transistor
saturation, and the high limit is controlled by the collector-base
breakdown voltage of the 2N2222.
Figure 31. A High-Compliance, Digitally Controlled
Precision Current Source
A Single-Supply, Programmable Current Source
The circuit in Figure 32 shows how the DAC8512 can be used
with an OP295 single-supply, rail-to-rail output op amp to pro-
vide a digitally programmable current sink from V_SOURCE that
consumes less than 3.8 mA, maximum. The DAC’s output volt-
age is applied across R1 by placing the 2N2222 transistor in the
A Digitally Programmable Window Detector
A digitally programmable, upper/lower limit detector using two
DAC8512s is shown in Figure 33. The required upper and
lower limits for the test are loaded into each DAC individually
by controlling HDAC/LDAC. If a signal at the test input is not
within the programmed limits, the output will indicate a logic
zero which will turn the red LED on.
+5V
+5V
1kΩ
0.1µF
VIN
1
6
2 _DAC8512
5
3
8
+5V
+5V
0.1µF
R1
604Ω
+5V
R2
604Ω
2
1/6
74HC05
1
CLR
HDAC/LDAC
LD
SCLK
SDI
4
7
+5V
0.1µF
1
6
2 _DAC8512
5
3
8
4
7
3
5
C1
2
4
7
C2
1
6
12
C1, C2 = 1/4 CMP-404
RED LED
T1
PASS/FAIL
GREEN LED
T1
3
4
1/6
74HC05
Figure 33. A Digitally Programmable Window Detector
–12–
REV. A