MX581 Maxim Integrated Products, Inc., MX581 Datasheet - Page 6

• Manufacturer Part Number: MX581
• Description: Mx581 High-precision, 10v Reference
• Manufacturer: Maxim Integrated Products, Inc.

By adding a single resistor as shown in Figure 5, the
MX581 is turned into a precision current limiter for
applications where the driving voltage is 12.5V to 40V.
The programmed current ranges from 0.75mA to 5mA.
Where a -10V reference is required, the MX581 can be
connected as a two-terminal device and biased like a
zener diode. The circuit is shown in Figure 6. +V
V
and the MX581’s GND pin is connected, through a
resistor, to the negative supply. With 1mA flowing in the
reference, the output voltage is typically 2mV greater
than what is obtained with the conventional, positive
hook-up.
Figure 5. Two-Component Precision Current Limiter
Figure 6. Two-Terminal -10V Reference
OUT
are connected to the system’s analog ground
0.01µF
MX581
+V
GND
S
_______________________________________________________________________________________
V
OUT
MX581
-15V
R
Negative 10V Reference
+V
GND
1.2kΩ 5%
S
V
OUT
I =
Current Limiter
10V
V
-10V
R
REF
ANALOG
GND
+ 0.75mA
High-Precision, 10V Reference
S
and
When using the 2-terminal connection, the load and the
bias resistor must be selected so that the current flow-
ing in the reference is maintained between 1mA and
5mA. The operating temperature range for this connec-
tion is limited to -55°C to +85°C.
The MX581 is well suited for use with a wide variety of
digital-to-analog converters, especially CMOS DACs.
Figure 7 shows a circuit in which an MX7533 10-bit
DAC outputs 0 to -10V when using a +10V reference.
For a positive DAC output, the MX581 is configured as
a 2-terminal -10V reference (Figure 6) and connected
to the DAC’s V
In Figure 8, an MX7574 CMOS ADC uses an MX581 for
its -10V reference input. The input range for the ADC is
0 to +10V.
Figure 7. Low-Power, 10-Bit CMOS DAC Connection
Figure 8. Negative 10V Reference for CMOS ADC
MX581
+V
GND
+V
S
S
Reference for CMOS DACs and ADCs
V
OUT
MX581
DIGITAL INPUT
V
REF
V
REF
OUT
15
4-13
MX7533
GND
0.01µF
V
input.
DD
14
-15V
GND
R
FB
ANALOG
+15V
16
3
1.2kΩ
OUT1
OUT2
INPUT
1
2
2
3
4
5
DIGITAL OUTPUTS
V
B
A
AGND
MAX400
REF
DFS
IN
DB0-DB7
MX7574
13-6
DGND
V
DD
1
18
V
0V TO -10V
+5V
OUT
5