MX584 Maxim Integrated Products, Inc., MX584 Datasheet - Page 7

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

The MX584 is capable of sinking as well as sourcing
current. The circuit is also protected for output shorts to
either +VS or ground (COMMON). The output’s voltage
versus current characteristic is shown in the Typical
Operating Characteristics section. For applications that
require the MX584 to sink current, maintain a load
capacitance of 10nF or greater for proper operation.
The turn-on settling performance of the MX584 is
shown in the Typical Operating Characteristics. Both
coarse and fine transient response is shown. The refer-
ence typically settles to 1mV (10V output) within 180µs
after power is applied.
The bandwidth of the MX584’s output amplifier can be
limited by connecting a capacitor between the CAP
and VBG pins (see Figure 4). Typical values range from
0.01µF to 0.1µF. The reduction of wideband and
feedthrough noise is plotted in a graph in the Typical
Operating Characteristics section.
The STROBE input, pin 5, zeroes the reference output
when it is pulled LOW. If no current is pulled from
STROBE, operation is normal. The threshold of the
input is 200mV, so an open-drain n-channel FET or
open-collector transistor driven from logic is recom-
mended (see Figure 5). The current-sinking ability
should be at least 500µA and the leakage current
should be 5µA or less. While shut down, the MX584
should not be required to source or sink current unless
a 0.7V residual output is acceptable. If the reference is
required to sink transient current while shut down, the
Pin-Programmable, Precision Voltage
Reference
Figure 9. Two-Terminal -5V Reference
6
_______________________________________________________________________________________
0.01µF
MX584
+V
COM
-15V
S
8
4
RS
2.4kΩ
5%
Dynamic Performance
10V
5V
5V
1
2
Output Current
Noise Filtering
GROUND
ANALOG
Strobe Input
V
REF
= -5V
current flowing out of STROBE should be limited with
100Ω as shown in the dashed connection in Figure 5.
A PNP power transistor, or Darlington, is easily connect-
ed to the MX584 to greatly increase its output current.
The circuit in Figure 6 provides a +10V output at up to
4A. If the load has a significant capacitive component,
C1 should be added. If the load is purely resistive, high-
frequency supply rejection is improved without C1. An
NPN output transistor or Darlington can also be used to
boost output current as shown in Figure 7.
By adding a single resistor as shown in Figure 8, the
MX584 is turned into a precision current limiter for
Figure 10. Low-Power, 10-Bit CMOS DAC Connection
Figure 11. MX584 as Negative 2.5V Reference for a CMOS
ADC
8
+V
S
10V
1
MX584
MX584
+V
COM
S
8
4
Precision High-Current Reference
2.5V
COM
10V
3
5V
Applications Information
1
2
4
-5V
-2.5V
0 TO +2.5V
1kΩ
5%
5V
0.01µF
DIGITAL
V
INPUT
REF
4-13
15
REF
INPUT
MX7533
14
GND
R
FB
16
3
7.5V to 15V
OUT1
OUT2
2
5
V
B
A
AGND
1
2
REF
OFS
IN
Current Limiter
MX7574
+5V
V
DD
1
TO -15V
DGND
-7.5V
DB0–
DB7
MAX400
18
13-6
0 TO -5V
V
OUT
DIGITAL
OUTPUTS