DMS30DR MURATA [Murata Manufacturing Co., Ltd.], DMS30DR Datasheet - Page 3

• Manufacturer Part Number: DMS30DR
• Manufacturer: MURATA [Murata Manufacturing Co., Ltd.]

4. ANALOG COMMON (Pin 10): This pin is connected to an internal,
5. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7): Pin 8 is a preci-
6. Decimal Point Placement: The location of the decimal point is user
7. Gain-Adjust Potentiometer: The gain-adjust potentiometer located
8. Soldering Methods: All models in the DMS-30DR Series easily
9. Suggested Mating Connectors:
accuracy and temperature drift of the meter. A ±1% 1.82K limiting
resistor is connected between the reference IC and pin 9.
low-noise, “relative” ground. Pin 10 also serves as the internal
ground for the +1.225V reference IC. ANALOG COMMON is used
in certain differential and “fl oating” measurements as described in
the Applications section of this data sheet, and in DMS Applica-
tion Note 3. For the vast majority of applications, pin 10 should not
be connected to pin 3 (5V RETURN), or to your system’s analog
ground.
sion reference actively trimmed at the factory. For normal operation,
pin 8 must be tied to pin 7 to achieve all listed accuracy and drift
specifi cations.
selectable, and the decimal point control pins (DP1-DP3) are active
low functions. Select the desired decimal point by tying the appro-
priate pin (pin 4, 5 or 6) to pin 3 (5V RETURN). Unused decimal
point location pins should be left open. Hard wiring is preferable,
however, you can use logic gates to exercise dynamic control over
the location of the decimal point if the following drive conditions are
met:
Applied “0” Voltage: +0.4V max
* The driving gates must be able to sink this much current (IOL)
on the rear of the meter has approximately ±50 counts (±2.5%)
of adjustment range with a near full-scale input. Since these
meters essentially have no zero/offset errors, a gain adjustment is
effectively an overall accuracy adjustment. Though they may be
performed at any input level except zero, accuracy adjustments are
most effective when performed with half-scale (or higher) positive
input signals.
If a wider adjustment range is required, an external potentiometer
circuit can be confi gured using the meter’s +1.225V reference
output (pin 9). The circuit shown in Figure 9 provides ±10% range
of adjustment.
withstand most common leaded or lead-free soldering opera-
tions, performed either manually or by wave soldering machines.
However, users should evaluate the effects their particular soldering
techniques may have on the meter’s plastic case and precision
electrical performance. We highly recommend using low residue,
no-clean solders.
Panel mounted: Connector housing P/N 4320-01069-0
Terminal type: P/N 4400-01032-0
Crimping tool: P/N 39-2099000
Wire size: 22 to 26 AWG
Insulation diameter: 0.062” (1.57mm) maximum
Stripping length: 0.100 to 0.125” (2.54 to 3.17mm)
Board mounted: Socket: P/N 4320-01074-0
Drive Current*: 6mA max.
with a logic “0” output.
www.murata-ps.com
APPLICATIONS
1. Single-Ended Input Confi gurations: True single-ended measure-
85-264Vac
DMS-30DR meters are highly versatile devices that can be used in
hundreds of applications. The application circuits chosen for this sec-
tion have historically received many inquiries. Every attempt has been
made to ensure technical accuracy, and all of the following circuits
have been prototyped and tested to ensure functionality. Please keep
in mind, however, that real-world applications are seldom as straight-
forward as the approaches presented here. Most applications have
many more components — and many more connections — than the
illustrations show.
The simplifi ed schematic shown in Figure 1 can be very useful when
debugging a malfunctioning panel meter circuit, particularly if the user
has some knowledge of operational amplifi ers (op amps). The meter's
high-impedance input consists of an op amp powered from a ±5Vdc
power supply (the –5V is internally generated). Knowing this, one can
easily see why input signals applied to (–) INPUT LO and (+) INPUT HI
have to be kept within the power supply rails of ±5V. Also note that only
pin 11 has a current-limiting 909kΩ series resistor. High input voltages
that have a common ground with pin 3 (5V RETURN) should only be
applied to pin 11 ((+) INPUT HI) and never to pin 12. In these high-volt-
age cases, pin 12 should always be tied to pin 3 (5V RETURN).
One of the simplifi ed schematic's noteworthy features is that it
shows internal voltage values. It also shows that pin 3 is the meter's
zero-volt reference point — regardless of the type of power or signal
source used. This is an important point to keep in mind when a digital
or analog multimeter is used to make system measurements. The
multimeter's negative lead (usually the black one) must be connected
to pin 3 (5V RETURN).
ments can be made with any DMS-30DR meter. The circuit of Figure
2 avoids problems normally associated with ground-loop currents.
Separate ground runs should be used for 5V RETURN (pin 3) and (–)
INPUT LO (pin 12). This will ensure that large LED currents will not
fl ow in the wiring that connects V
loop currents can cause unstable readings.
+
–
V
IN
AC to DC Converter
Technical enquiries email: [e-mail], tel:
Figure 2. Single-Ended Input Confi guration
(–) IN LO
(+) IN HI
Sunlight Readable, 3½ Digit Panel Meters
11
12
+5V SUP
DMS-30DR Series
1
with Auto-Dimming LED Displays
IN
to (–) INPUT LO (pin 12). Ground-
DMS-30DR-1
MPM_DMS-30DR.B04 Page 3 of 6
6
DP1
3
5V RET
[phone]
8
REF OUT
7
REF IN