MX584 Maxim Integrated Products, Inc., MX584 Datasheet - Page 5

• Manufacturer Part Number: MX584
• Description: Mx584 Pin-programmable Precision Voltage Reference
• Manufacturer: Maxim Integrated Products, Inc.

As shown in Figure 1, most applications of the MX584
require no external components. Connections to +V
and COMMON (COMMON is also tied to the case in the
TO-99 metal package) with all other pins unconnected
result in a buffered +10.00V output at pin 1. The other
pretrimmed voltages are obtained by strapping pins as
shown in Table 1. If one or more external buffer ampli-
fiers are connected to the programming pins (pins 2, 3),
multiple outputs can be obtained from one reference.
The MX584 can be adjusted to a different output volt-
age by adding one or more resistors as in Figure 2. As
the diagram shows, the reference can be thought of as
a 1.215V bandgap followed by a noninverting amplifier.
If R1 and R2 are used alone, the adjustment range is
widest but the resolution of the trim may be too coarse,
even when a multi-turn trip pot is used.
When adding external resistors, output voltages well
above 10V can be obtained. R2 should therefore be
chosen carefully since it sets the maximum output volt-
age. R2’s resistance should not be so low as to jeopar-
dize other circuits if R1 is misadjusted.
The fixed output voltages can also be varied by con-
necting only one resistor, as in the dashed lines in
Figure 2. Connecting R3 alone raises V
alone lowers it. These resistors (or potentiometers)
must have very low temperature coefficients if accuracy
over temperature is to be unaffected by the adjustment.
If fine adjustment of the output is all that is required, the
circuit of Figure 3 is recommended. It provides good
stability and resolution for a trim range of ±200mV. If
the 2.5V output is adjusted, R2 should be connected to
V
±100mV.
The temperature characteristic of the MX584 consis-
tently follows an "S-curve" as shown in the Typical
Operating Characteristics. A five-point 100% test guar-
antees compliance with -55°C to +125°C specifications
and a three-point 100% test guarantees 0°C to +70°C
specifications.
The tolerance specifications in the Electrical
Characteristics table state the maximum deviation from
the reference’s initial value at +25°C. By adding the
maximum deviation for a given device to its initial toler-
ance, the total possible error is determined.
Pin-Programmable, Precision Voltage
Reference
4
BG
_______________________________________________________________________________________
, pin 6, and the trim range should be limited to
Voltage Temperature Coefficient
Detailed Description
Other Output Voltages
OUT
while R4
S
Table 1. Programming Pin Connections
Figure 1. Basic Connection for Positive Outputs
Figure 2. Variable Output Options
OUTPUT VOLTAGE
*THE 2.5V TAP (PIN 3) IS USED INTERNALLY AS A BIAS POINT AND SHOULD
NOT BE CHANGED BY MORE THAN 100mV IN ANY TRIM CONFIGURATION.
+1.215V
(V)
7.5
5.0
2.5
10
+(V
OUT
V
+ 2.5V) TO +30V
MX584
SUPPLY
+V
+2.5V*
8
+V
S
8
4
S
Pins 2 and 3 are unconnected
Connect pins 2 and 3 together
Connect pins 2 and 1 together
Connect pins 3 and 1 together
10.0V
PROGRAMMING (OUTPUT ON PIN 1)
5.0V
2.5V
8kΩ
4kΩ
4kΩ
MX584
1
2
3
COM
2.5V
10V 1
V
5V
BG
V
+2.5V, +5.0V, +7.5V, +10V
OUT
2
3
5
4
,
R4
R3
R1
R2
V
OUT