DAC16 Datasheet, PDF (9/12 Pages) Analog Devices – 16-Bit High Speed Current-Output DAC

DAC16
0.1␮F
+5V
10␮F
+15V
CLK
EN
R1
R2
5k⍀
5k⍀
REF02
22␮F
47␮F
DIGITAL +5V
PIN 3, DAC16
0.1␮F
–15V
DIGITAL INPUT WORD
DB0 – DB7
DB8 – DB15
74AC11377
74AC11377
8
8
R3
2.5k⍀
(5k⍀،2)
+15V
0.1␮F
10␮F
I_REF
REF GND
C_COMP
100nF
CERAMIC
I_OUT
DAC16
AGND
0.1␮F
OP97A
0.1␮F
10␮F
V_OUT
0V TO +10V FS
10␮F
–15V
–15V
RESISTORS:
CADDOCK T912–5K–010–02 (OR EQUIVALENT)
5k⍀, 0.01%, TC TRACK = 2 ppm/؇C
Figure 24. Unipolar Circuit Configuration
0.1␮F
+5V
10␮F
DIGITAL INPUT WORD
+5V_REF
DB0 – DB7
DB8 – DB15
CLK
EN
+15
V
+5V_REF
REF02
R1
5k⍀
R2
5k⍀
22␮F
74AC11377
74AC11377
8
8
I_REF
REF GND
C_COMP
I_OUT
DAC16
AGND
R3
2.5k⍀
(5k⍀،2)
R4
2.5k⍀
(5k⍀،2)
+15V
0.1␮F
10␮F
OP97A
0.1␮F
V_OUT
؎5V FS
47␮F
DIGITAL +5V
PIN 3, DAC16
0.1␮F
100nF
CERAMIC
–15V
0.1␮F
10␮F
10␮F
–15V
–15V
RESISTORS:
CADDOCK T912–5K–010–02 (OR EQUIVALENT)
5k⍀ , 0.01%, TC TRACK = 2 ppm/؇C
Figure 25. Bipolar Circuit Configuration
Bipolar Configuration
For applications that require a bipolar output voltage, the circuit
in Figure 24 can be modified slightly by adding a resistor from
the reference to the inverting sum node of the output amplifier
to level shift the output signal. The transfer equation for the cir-
cuit now becomes:
V_O
=
R4 × 8 × I_REF
 _{65,535 – Digital}


65, 536
Code ^


–
V_REF
×


R4
R3


The circuit has the form shown in Figure 25, and Table IV pro-
vides the relationship between the digital input code and the
circuit’s output voltage for the component values shown.
Table IV. Bipolar Output Operation vs. Digital Input Code
Digital Input
Word (Hex)
Decimal Number in
DAC Decoder
Analog Output
Voltage (V)
0000
7FFE
7FFF
8000
FFFF
65,535
32,769
32,768
32,767
0
4.999848
152E-6
0
–152E-6
–5.00000
REV. B
–9–