MAX1365 Datasheet, PDF (9/25 Pages) Maxim Integrated Products – Stand-Alone, 4.5-/3.5-Digit Panel Meters with 4-20mA Output

Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
Pin Description
PIN
NAME
FUNCTION
1
AIN+
Positive Analog Input. Positive side of fully differential analog input. Bypass AIN+ to GND with a
0.1µF or greater capacitor.
2
AIN-
Negative Analog Input. Negative side of fully differential analog input. Bypass AIN- to GND with a
0.1µF or greater capacitor.
3
GND
Ground. Connect to star ground.
4
AV_DD
Analog Positive Supply Voltage. Connect AV_DD to a +2.7V to +5.25V power supply. Bypass AV_DD
to GND with a 0.1µF capacitor.
5
DV_DD
Digital Positive Supply Voltage. Connect DV_DD to a +2.7V to +5.25V power supply. Bypass DV_DD
to GND with a 0.1µF capacitor.
6
SET
Segment Current Set. Connect to ground through a resistor to set the segment current. See Table
7 for segment-current selection.
7
REG_VDD V/I Converter Regulated Supply Output (5.2V typ)
8
REG_FORCE REG_VDD Control. Drives the gate of external depletion-mode FET.
9
REG_AMP Regulator/Reference Buffer Supply. Connect to a 4.75V to 5.25V power supply.
10
CMP
Regulator Compensation Node. Connect a 0.1µF capacitor from CMP to REG_FORCE.
11
DAC_VDD DAC Analog Supply. Connect DAC_VDD to a +2.7V to +5.25V power supply.
12
DACVOUT DAC Voltage Output. DAC output impedance is typically 6.2kΩ.
13
CONV_IN V/I Converter Input
14
4-20OUT 4–20mA (0 to 16mA) Current-Loop Output. Referenced to GND.
15
GND_DAC DAC Analog Ground. Connect to star ground.
16
GND_V/I V/I Converter Analog Ground. Connect to star ground.
V-to-I Converter/DAC Reference Input. Connect a voltage source for external reference operation
17
REF_DAC or leave floating for internal reference. Bypass REF_DAC with a 0.1µF capacitor to GND for either
internal or external reference operation.
18
EN_BPM Active-High V/I-Converter Bipolar-Mode Enable. Set high for bipolar mode. Set low for unipolar mode.
19
EN_I
Active-High V/I-Converter 4mA Offset Enable. Set low for 0 to 16mA output. Set high for 4–20mA.
20
REFSELE
DAC External Reference Selection. Set low for internal reference. Set high for external reference.
Leave REF_DAC unconnected when REFSELE is low.
21
DACDATA_SEL DAC Data-Source Select. Connect to logic high for the MAX1365/MAX1367.
22
CS_DAC DAC Chip Select. Connect to logic high for the MAX1365/MAX1367.
23
INTREF
ADC Reference Selection. Set INTREF high to select the internal ADC reference. Set INTREF low
to select external ADC reference.
24
RANGE
ADC Range Select. Set RANGE low for ±2V analog input voltage range. Set RANGE high for
±200mV analog input voltage range.
25
PEAK
Peak Logic Input. Connect PEAK to DV_DD to display the highest ADC value on the LED. Connect
PEAK to GND to disable the PEAK function (see Table 1).
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