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 420mA
(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 420mA
(or 0 to 16mA) current-loop output.

In normal operation, the 0 to 16mA/420mA 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.

Applications

Automated Test Equipment

Data-Acquisition Systems

Digital Multimeters

Digital Panel Meters

Digital Voltmeters

Industrial Process Control

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
100M

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 420mA 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

Stand-Alone, 4.5-/3.5-Digit Panel Meters

with 420mA Output

________________________________________________________________ Maxim Integrated Products

Selector Guide

19-3889; Rev 1; 1/06

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.

PART

TEMP RANGE

PIN-PACKAGE

MAX1365ECM

-40°C to +85°C

48 TQFP

MAX1367ECM

-40°C to +85°C

48 TQFP

Ordering Information

PART

RESOLUTION

(DIGITS)

PKG

CODE

MAX1365ECM

4.5

C48-6

MAX1367ECM

3.5

C48-6

Pin Configuration appears at end of datasheet.

Typical Operating Circuits appear at end of datasheet.

MAX1365/MAX1367

Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 420mA Output

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(AV

= DV

= 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

= T

MIN

to T

MAX

. Typical values are at T

= +25°C, unless otherwise noted.)

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.

DD,

DD ....................................................................

-0.3V to +6.0V

AIN+, AIN-, REF+, REF-.........................V

NEGV

to (AV

+ 0.3V)

REG_FORCE, CMP, DAC_VDD, DACVOUT,

CONV_IN, 4-20OUT .............................-0.3V to (AV

+ 0.3V)

EN_BPM, EN_I, REFSELE, DACDATA_SEL, INTREF, RANGE,

DPSET1, DPSET2, HOLD, PEAK, DPON,
CS_DAC...............................................-0.3V to (DV

+ 0.3V)

NEGV .......................................................-2.6V to (AV

+ 0.3V)

LED_EN....................................................-0.3V to (DV

+ 0.3V)

SET...........................................................-0.3V to (AV

+ 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

+ 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

= +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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

ADC ACCURACY

MAX1365

-19,999

+19,999

Noise-Free Resolution

MAX1367

-1999

+1999

Counts

2.000V range

±1

Integral Nonlinearity (Note 1)

INL

200mV range

±1

Counts

Range Change Ratio

AIN+

- V

AIN-

= 0.100V) on 200mV range;

AIN+

- V

AIN-

= 0.100V) on 2.0V range

10:1

Ratio

Rollover Error

AIN+

- V

AIN-

= full scale

±1

Counts

Output Noise

µV

P-P

Offset Error (Zero Input Reading)

AIN+

- V

AIN-

= 0 (Note 2)

-0

Counts

Gain Error

(Note 3)

-0.5

+0.5

%FSR

Offset Drift (Zero Reading Drift)

AIN+

- V

AIN-

= 0 (Note 4)

0.1

µV/°C

Gain Drift

±1

ppm/°C

INPUT CONVERSION RATE

Update Rate

ANALOG INPUTS (AIN+, AIN-) (bypass to GND with 0.1µF or greater capacitors)

RANGE = GND

-2.0

+2.0

AIN Input Voltage Range (Note 5)

RANGE = DV

-0.2

+0.2

AIN Absolute Input Voltage
Range to GND

-2.2

+2.2

Normal-Mode 50Hz and 60Hz
Rejection (Simultaneously)

50Hz and 60Hz ±2%

100

MAX1365/MAX1367

Stand-Alone, 4.5-/3.5-Digit Panel Meters

with 420mA Output

_______________________________________________________________________________________

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Common-Mode 50Hz and 60Hz
Rejection (Simultaneously)

CMR

For 50Hz and 60Hz ±2%, R

SOURCE

10k

150

Common-Mode Rejection

CMR

At DC

100

Input Leakage Current

Input Capacitance

Average Dynamic Input Current

-20

+20

INTERNAL REFERENCE (REF- = GND, INTREF = DV

)

REF Input Voltage

REF

2.007

2.048

2.089

REF Output Short-Circuit Current

REF Output Temperature
Coefficient

VREF

ppm/°C

Load Regulation

SOURCE

= 0 to 300µA, I

SINK

= 0 to 30µA

µV/µA

Line Regulation

µV/V

0.1Hz to 10Hz

Noise Voltage

10Hz to 10kHz

400

µV

P-P

EXTERNAL REFERENCE (INTREF = GND)

REF Input Voltage

Differential (V

REF+

- V

REF-

)

2.048

Absolute REF+, REF- Input
Voltage to GND (V

REF+

Must Be

Greater Than V

REF-

)

-2.2

+2.2

Normal-Mode 50Hz and 60Hz
Rejection (Simultaneously)

50Hz and 60Hz ±2%

100

Common-Mode 50Hz and 60Hz
Rejection (Simultaneously)

CMR

For 50Hz and 60Hz ±2%, R

SOURCE

10k

150

Common-Mode Rejection

CMR

At DC

100

Input Leakage Current

Input Capacitance

Average Dynamic Input Current

(Note 6)

-20

+20

CHARGE PUMP

Output Voltage

NEGV

= 0.1µF to GND

-2.60

-2.42

-2.30

DIGITAL INPUTS (INTREF, RANGE, PEAK, HOLD, DPSET1, DPSET2)

Input Current

= 0 or DV

-10

+10

µA

Input Low Voltage

INL

0.3 x

Input High Voltage

INH

0.7 x

Input Hysteresis

HYS

= 3V

200

ELECTRICAL CHARACTERISTICS (continued)

(AV

= DV

= 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

= T

MIN

to T

MAX

. Typical values are at T

= +25°C, unless otherwise noted.)

MAX1365/MAX1367

Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 420mA Output

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(AV

= DV

= 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

= T

MIN

to T

MAX

. Typical values are at T

= +25°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

ADC POWER SUPPLY (Note 7)

Voltage

2.70

5.25

Voltage

2.70

5.25

Power-Supply Rejection AV

PSR

(Note 8)

Power-Supply Rejection DV

PSR

(Note 8)

100

640

Current (Note 9)

AVDD

Standby mode

305

µA

= +5.25V

320

= +3.3V

180

Current (Note 9)

DVDD

Standby mode

µA

DAC POWER SUPPLY

DAC Supply Voltage

DAC_VDD

2.70

5.25

DAC Supply Current

0.10

0.21

LINEAR REGULATOR AND V/I CONVERTER POWER REQUIREMENTS

REG_AMP Supply Voltage

REG_AMP

4.75

5.25

REG_AMP Supply Current

0.19

0.30

REG_VDD Supply Voltage

REG_VDD

5.20

REG_VDD Supply Current

Includes 20mA programmed current

25.2

27.4

LED DRIVERS

LED Supply Voltage

LEDV

2.70

5.25

LED Shutdown Supply Current

SHDN

µA

LED Supply Current

LEDV

176

180

MAX1365

512

Display Scan Rate

OSC

MAX1367

640

Segment Current Slew Rate

SEG

mA/µs

DIG_ Voltage Low

DIG

0.178

0.300

Segment-Drive Source-Current
Matching

SEG

±12

Segment-Drive Source Current

SEG

LEDV

- V

SEG

= 0.6V, R

SET

= 25k

15.0

21.5

25.5

LED Drivers Bias Current

From AV

120

µA

Interdigit Blanking Time

µs

MAX1365/MAX1367

Stand-Alone, 4.5-/3.5-Digit Panel Meters

with 420mA Output

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(AV

= DV

= 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

= T

MIN

to T

MAX

. Typical values are at T

= +25°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DAC OUTPUT ACCURACY

Zero-Scale Error

420mA or 0 to 16mA mode, T

= +25°C

±50

µA

Zero-Scale Error Tempco

±40

p p mFS /

° C

Gain Error

420mA or 0 to 16mA mode, T

= +25°C

±0.5

%FS

Gain-Error Tempco

±25

p p mFS /

° C

Span Linearity

±2

±4

µA

Power-Supply Rejection

PSR

EXT

= 7V to 30V

µA/V

Signal Path Noise

10pF to GND on 4-20OUT

2.0

µA

RMS

420mA Current Limit

Limited to 12.5 x V

REF

/ 1.28k

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

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.

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