19-3889; Rev 1; 1/06
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
General Description
The MAX1365/MAX1367 low-power, 4.5- and 3.5-digit,
panel meters feature an integrated sigma-delta analog-
to-digital converter (ADC), LED display drivers, voltage
digital-to-analog converter (DAC), and a 4–20mA
(or 0 to 16mA) current driver.
The MAX1365/MAX1367’s analog input voltage range is
programmable to either ±2V or ±200mV. The MAX1367
drives a 3.5-digit (±1999 count) display and the
MAX1365 drives a 4.5-digit (±19,999 count) display.
The ADC output directly drives the LED display as well
as the voltage DAC, which in turn drives the 4–20mA
(or 0 to 16mA) current-loop output.
In normal operation, the 0 to 16mA/4–20mA current-
loop output follows the ±2V or ±200mV analog input to
drive remote panel-meter displays, data loggers, and
other industrial controllers. For added flexibility, the
MAX1365/MAX1367 allow direct access to the DAC
output and the V/I converter input.
The sigma-delta ADC does not require external preci-
sion integrating capacitors, autozero capacitors, crystal
oscillators, charge pumps, or other circuitry commonly
required in dual-slope ADC panel-meter circuits. On-
chip analog input and reference buffers allow direct
interface with high-impedance signal sources. Excellent
common-mode rejection and digital filtering provide
greater than 100dB rejection of simultaneous 50Hz and
60Hz line noise. Other features include data hold, peak
detection, and overrange/underrange detection.
The MAX1365/MAX1367 require a 2.7V to 5.25V supply,
a 4.75V to 5.25V V/I supply, and a 7V to 30V loop sup-
ply. They are available in a space-saving (7mm x
7mm), 48-pin TQFP package and operate over the
extended (-40°C to +85°C) temperature range.
Features
♦
Stand-Alone, Digital Panel Meter
20-Bit Sigma-Delta ADC
4.5-Digit Resolution (±19,999 Count, MAX1365)
3.5-Digit Resolution (±1999 Count, MAX1367)
No Integrating/Autozeroing Capacitors
100MΩ Input Impedance
±200mV or ±2.000V Input Range
♦
LED Display
Common-Cathode 7-Segment LED Driver
Programmable LED Current (0 to 20mA)
2.5Hz Update Rate
♦
Output DAC and Current Driver
±15-Bit DAC with 14-Bit Linear V/I Converter
Selectable 0 to 16mA or 4–20mA Current Output
Unipolar/Bipolar Modes
±50µA Zero Scale, ±40ppmFS/°C (typ)
±0.5% Gain Error, ±25ppmFS/°C (typ)
Separate 7V to 30V Supply for Current-Loop
Output
♦
2.7V to 5.25V ADC/DAC Supply
♦
4.75V to 5.25V V/I Converter Supply
♦
Internal 2.048V Reference or External Reference
♦
48-Pin, 7mm x 7mm TQFP Package
MAX1365/MAX1367
Ordering Information
PART
MAX1365ECM
MAX1367ECM
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
48 TQFP
48 TQFP
Applications
Automated Test Equipment
Data-Acquisition Systems
Digital Multimeters
Digital Panel Meters
Digital Voltmeters
Industrial Process Control
Selector Guide
PART
MAX1365ECM
MAX1367ECM
RESOLUTION
(DIGITS)
4.5
3.5
PKG
CODE
C48-6
C48-6
Pin Configuration appears at end of datasheet.
Typical Operating Circuits appear at end of datasheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
MAX1365/MAX1367
ABSOLUTE MAXIMUM RATINGS
AV
DD,
DV
DD ....................................................................
-0.3V to +6.0V
AIN+, AIN-, REF+, REF-.........................V
NEGV
to (AV
DD
+ 0.3V)
REG_FORCE, CMP, DAC_VDD, DACVOUT,
CONV_IN, 4-20OUT .............................-0.3V to (AV
DD
+ 0.3V)
EN_BPM, EN_I, REFSELE, DACDATA_SEL, INTREF, RANGE,
DPSET1, DPSET2, HOLD, PEAK, DPON,
CS_DAC...............................................-0.3V to (DV
DD
+ 0.3V)
NEGV .......................................................-2.6V to (AV
DD
+ 0.3V)
LED_EN....................................................-0.3V to (DV
DD
+ 0.3V)
SET...........................................................-0.3V to (AV
DD
+ 0.3V)
REG_AMP, REG_VDD ...........................................-0.3V to +6.0V
LEDV......................................................................-0.3V to +6.0V
LEDG .....................................................................-0.3V to +0.3V
GND_DAC .............................................................-0.3V to +0.3V
GND_V/I.................................................................-0.3V to +0.3V
SEG_ to LEDG.........................................-0.3V to (V
LEDV
+ 0.3V)
DIG_ to LEDG..........................................-0.3V to (V
LEDV
+ 0.3V)
REF_DAC .................................................-0.3V to (AV
DD
+ 0.3V)
DIG_ Sink Current .............................................................300mA
DIG_ Source Current...........................................................50mA
SEG_ Sink Current . ............................................................50mA
SEG_ Source Current..........................................................50mA
Maximum Current Input into Any Other Pin . ......................50mA
Continuous Power Dissipation (T
A
= +70°C)
48-Pin TQFP (derate 22.7mW/°C above +70°C).....1818.2mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(AV
DD
= DV
DD
= DAC_VDD = +2.7V to +5.25V, GND = 0, V
LEDV
= +2.7V to +5.25V, LEDG = 0, V
REF+
- V
REF-
= 2.048V (external
reference), 4-20OUT = 7V, V
REG_AMP
= +5.0V, C
REF+
= 0.1µF, REF- = GND, C
NEGV
= 0.1µF. Internal clock mode, unless otherwise
noted. All specifications are at T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
ADC ACCURACY
Noise-Free Resolution
Integral Nonlinearity (Note 1)
Range Change Ratio
Rollover Error
Output Noise
Offset Error (Zero Input Reading)
Gain Error
Offset Drift (Zero Reading Drift)
Gain Drift
INPUT CONVERSION RATE
Update Rate
ANALOG INPUTS (AIN+, AIN-) (bypass to GND with 0.1µF or greater capacitors)
AIN Input Voltage Range (Note 5)
AIN Absolute Input Voltage
Range to GND
Normal-Mode 50Hz and 60Hz
Rejection (Simultaneously)
50Hz and 60Hz ±2%
RANGE = GND
RANGE = DV
DD
-2.0
-0.2
-2.2
100
+2.0
+0.2
+2.2
V
V
dB
5
Hz
V
AIN+
- V
AIN-
= 0 (Note 2)
(Note 3)
V
AIN+
- V
AIN-
= 0 (Note 4)
-0
-0.5
0.1
±1
INL
MAX1365
MAX1367
2.000V range
200mV range
(V
AIN+
- V
AIN-
= 0.100V) on 200mV range;
(V
AIN+
- V
AIN-
= 0.100V) on 2.0V range
V
AIN+
- V
AIN-
= full scale
-19,999
-1999
±1
±1
10:1
±1
10
+0
+0.5
+19,999
+1999
Counts
Counts
Ratio
Counts
µV
P-P
Counts
%FSR
µV/°C
ppm/°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= DAC_VDD = +2.7V to +5.25V, GND = 0, V
LEDV
= +2.7V to +5.25V, LEDG = 0, V
REF+
- V
REF-
= 2.048V (external
reference), 4-20OUT = 7V, V
REG_AMP
= +5.0V, C
REF+
= 0.1µF, REF- = GND, C
NEGV
= 0.1µF. Internal clock mode, unless otherwise
noted. All specifications are at T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
Common-Mode 50Hz and 60Hz
Rejection (Simultaneously)
Common-Mode Rejection
Input Leakage Current
Input Capacitance
Average Dynamic Input Current
INTERNAL REFERENCE (REF- = GND, INTREF = DV
DD
)
REF Input Voltage
REF Output Short-Circuit Current
REF Output Temperature
Coefficient
Load Regulation
Line Regulation
Noise Voltage
EXTERNAL REFERENCE (INTREF = GND)
REF Input Voltage
Absolute REF+, REF- Input
Voltage to GND (V
REF+
Must Be
Greater Than V
REF-
)
Normal-Mode 50Hz and 60Hz
Rejection (Simultaneously)
Common-Mode 50Hz and 60Hz
Rejection (Simultaneously)
Common-Mode Rejection
Input Leakage Current
Input Capacitance
Average Dynamic Input Current
CHARGE PUMP
Output Voltage
Input Current
Input Low Voltage
Input High Voltage
Input Hysteresis
NEGV
I
IN
V
INL
V
INH
V
HYS
DV
DD
= 3V
0.7 x
DV
DD
200
C
NEGV
= 0.1µF to GND
V
IN
= 0 or DV
DD
-2.60
-10
-2.42
-2.30
+10
0.3 x
DV
DD
V
µA
V
V
mV
DIGITAL INPUTS (INTREF, RANGE, PEAK, HOLD, DPSET1, DPSET2)
(Note 6)
-20
CMR
CMR
50Hz and 60Hz ±2%
For 50Hz and 60Hz ±2%, R
SOURCE
<
10kΩ
At DC
Differential (V
REF+
- V
REF-
)
-2.2
2.048
+2.2
V
V
0.1Hz to 10Hz
10Hz to 10kHz
TC
VREF
I
SOURCE
= 0 to 300µA, I
SINK
= 0 to 30µA
V
REF
2.007
2.048
1
40
6
50
25
400
2.089
V
mA
ppm/°C
µV/µA
µV/V
µV
P-P
-20
SYMBOL
CMR
CMR
CONDITIONS
For 50Hz and 60Hz ±2%, R
SOURCE
<
10kΩ
At DC
MIN
TYP
150
100
10
10
+20
MAX
UNITS
dB
dB
nA
pF
nA
MAX1365/MAX1367
100
150
100
10
10
+20
dB
dB
dB
nA
pF
nA
_______________________________________________________________________________________
3
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
MAX1365/MAX1367
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= DAC_VDD = +2.7V to +5.25V, GND = 0, V
LEDV
= +2.7V to +5.25V, LEDG = 0, V
REF+
- V
REF-
= 2.048V (external
reference), 4-20OUT = 7V, V
REG_AMP
= +5.0V, C
REF+
= 0.1µF, REF- = GND, C
NEGV
= 0.1µF. Internal clock mode, unless otherwise
noted. All specifications are at T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
ADC POWER SUPPLY (Note 7)
AV
DD
Voltage
DV
DD
Voltage
Power-Supply Rejection AV
DD
Power-Supply Rejection DV
DD
AV
DD
Current (Note 9)
AV
DD
DV
DD
PSR
A
PSR
D
I
AVDD
(Note 8)
(Note 8)
Standby mode
DV
DD
= +5.25V
DV
DD
Current (Note 9)
DAC POWER SUPPLY
DAC Supply Voltage
DAC Supply Current
LINEAR REGULATOR AND V/I CONVERTER POWER REQUIREMENTS
REG_AMP Supply Voltage
REG_AMP Supply Current
REG_VDD Supply Voltage
REG_VDD Supply Current
LED DRIVERS
LED Supply Voltage
LED Shutdown Supply Current
LED Supply Current
Display Scan Rate
Segment Current Slew Rate
DIG_ Voltage Low
Segment-Drive Source-Current
Matching
Segment-Drive Source Current
LED Drivers Bias Current
Interdigit Blanking Time
V
LEDV
I
SHDN
I
LEDV
f
OSC
I
SEG
/∆t
V
DIG
∆I
SEG
I
SEG
V
LEDV
- V
SEG
= 0.6V, R
SET
= 25kΩ
From AV
DD
15.0
MAX1365
MAX1367
176
512
640
25
0.178
3
21.5
120
4
0.300
±12
25.5
2.70
5.25
10
180
V
µA
mA
Hz
mA/µs
V
%
mA
µA
µs
V
REG_VDD
Includes 20mA programmed current
V
REG_AMP
4.75
0.19
5.20
25.2
27.4
5.25
0.30
V
mA
V
mA
V
DAC_VDD
2.70
0.10
5.25
0.21
V
mA
I
DVDD
DV
DD
= +3.3V
Standby mode
2.70
2.70
80
100
640
305
320
180
20
µA
5.25
5.25
V
V
dB
dB
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4
_______________________________________________________________________________________
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= DV
DD
= DAC_VDD = +2.7V to +5.25V, GND = 0, V
LEDV
= +2.7V to +5.25V, LEDG = 0, V
REF+
- V
REF-
= 2.048V (external
reference), 4-20OUT = 7V, V
REG_AMP
= +5.0V, C
REF+
= 0.1µF, REF- = GND, C
NEGV
= 0.1µF. Internal clock mode, unless otherwise
noted. All specifications are at T
A
= T
MIN
to T
MAX
. Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
DAC OUTPUT ACCURACY
Zero-Scale Error
Zero-Scale Error Tempco
Gain Error
Gain-Error Tempco
Span Linearity
Power-Supply Rejection
Signal Path Noise
4–20mA Current Limit
PSR
V
EXT
= 7V to 30V
10pF to GND on 4-20OUT
Limited to 12.5 x V
REF
/ 1.28kΩ
4–20mA or 0 to 16mA mode, T
A
= +25°C
±25
±2
4
2.0
20
±4
4–20mA or 0 to 16mA mode, T
A
= +25°C
±40
±0.5
±50
µA
ppmFS/°C
%FS
ppmFS/°C
µA
µA/V
µA
RMS
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1365/MAX1367
Note 1:
Integral nonlinearity is the deviation of the analog value at any code from its theoretical value after nulling the gain error and
offset error.
Note 2:
Offset calibrated.
Note 3:
Offset nulled.
Note 4:
Drift error is eliminated by recalibration at the new temperature.
Note 5:
The input voltage range for the analog inputs is given with respect to the voltage on the negative input of the differential pair.
Note 6:
V
AIN+
or V
AIN-
= -2.2V to +2.2V. V
REF+
or V
REF-
= -2.2V to +2.2V. All input structures are identical. Production tested on
AIN+ and REF+ only. V
REF+
must always be greater than V
REF-
.
Note 7:
Power-supply currents are measured with all digital inputs at either GND or DV
DD
.
Note 8:
Measured at DC by changing the power-supply voltage from 2.7V to 5.25V and measuring the effect on the conversion error
with external reference. PSRR at 50Hz and 60Hz exceeds 120dB with filter notches at 50Hz and 60Hz (Figure 1).
Note 9:
LED drivers are disabled.
_______________________________________________________________________________________
5
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