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DAC7644EB.A Datasheet(PDF) 21 Page - Texas Instruments

Part # DAC7644EB.A
Description  16-Bit, Quad Voltage Output DIGITAL-TO-ANALOG CONVERTER
PDF  27 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

DAC7644EB.A Datasheet(HTML) 21 Page - Texas Instruments

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21
®
DAC7644
Figure 15 shows a DAC7644 in a 4mA to 20mA current
output configuration. The output current can be determined
by Equation 3:
At full-scale, the output current is 16mA plus the 4mA for
the zero current. At zero scale the output current is the offset
current of 4mA (0.5V/125
Ω).
(2)
(3)
DIGITALLY-PROGRAMMABLE
CURRENT SOURCE
The DAC7644 offers a unique set of features that allows a
wide range of flexibility in designing applications circuits
such as programmable current sources. The DAC7644 offers
both a differential reference input as well as an open-loop
configuration around the output amplifier. The open-loop
configuration around the output amplifier allows transistor
to be placed within the loop to implement a digitally-
programmable, uni-directional current source. The availabil-
ity of a differential reference also allows programmability
for both the full-scale and zero-scale currents. The output
current is calculated as:
NC
NC
NC
NC
V
OUTA Sense
V
OUTA
V
REFL AB Sense
V
REFL AB
V
REFH AB
V
REFH AB Sense
V
OUTB Sense
V
OUTB
48
47
46
45
44
43
42
41
40
39
38
37
DAC7644
I
OUT
V
PROGRAMMED
125
Ω
80k
Ω
+0.5V
20k
Ω
+2.5V
+V
I
OUT
V
PROGRAMMED
125
Ω
GND
1000pF
2200pF
+V
OPA2350
100
Ω
1000pF
2200pF
100
Ω
FIGURE 15. 4-to-20mA Digitally Controlled Current Source (1/2 DAC7644).
I
VH
V
L
R
N Value
VL R
OUT
REF
REF
SENSE
REF
SENSE
=






+
()
–
•
,
/
65 536
I
V
V
N Value
V
OUT =




+ 
25
05
125
65 536
05
125
.– .
•
,
.
ΩΩ



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