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PDF MAX1367 Data sheet ( Hoja de datos )
| Número de pieza | MAX1367 | |
| Descripción | (MAX1365 / MAX1367) Digit Panel Meters | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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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.
Applications
Automated Test Equipment
Data-Acquisition Systems
Digital Multimeters
Digital Panel Meters
Digital Voltmeters
Industrial Process Control
Pin Configuration appears at end of datasheet.
Typical Operating Circuits appear at end of datasheet.
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
PART
MAX1365ECM
MAX1367ECM
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
48 TQFP
48 TQFP
PART
MAX1365ECM
MAX1367ECM
Selector Guide
RESOLUTION
(DIGITS)
4.5
3.5
PKG
CODE
C48-6
C48-6
________________________________________________________________ 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.
1 page  
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = DAC_VDD = +2.7V to +5.25V, GND = 0, VLEDV = +2.7V to +5.25V, LEDG = 0, VREF+ - VREF- = 2.048V (external
reference), 4-20OUT = 7V, VREG_AMP = +5.0V, CREF+ = 0.1µF, REF- = GND, CNEGV = 0.1µF. Internal clock mode, unless otherwise
noted. All specifications are at TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DAC OUTPUT ACCURACY
Zero-Scale Error
Zero-Scale Error Tempco
4–20mA or 0 to 16mA mode, TA = +25°C
±50 µA
±40 ppmFS/°C
Gain Error
Gain-Error Tempco
4–20mA or 0 to 16mA mode, TA = +25°C
±0.5 %FS
±25 ppmFS/°C
Span Linearity
±2 ±4
µA
Power-Supply Rejection
Signal Path Noise
4–20mA Current Limit
PSR VEXT = 7V to 30V
10pF to GND on 4-20OUT
Limited to 12.5 x VREF / 1.28kΩ
4 µA/V
2.0 µARMS
20 mA
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: VAIN+ or VAIN- = -2.2V to +2.2V. VREF+ or VREF- = -2.2V to +2.2V. All input structures are identical. Production tested on
AIN+ and REF+ only. VREF+ must always be greater than VREF-.
Note 7: Power-supply currents are measured with all digital inputs at either GND or DVDD.
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
5 Page 
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
Functional Diagram
AVDD DVDD INTREF PEAK RANGE DPON DPSET1 DPSET 2 HOLD CS_DAC DACDATA_SEL SET LEDV
AIN+
AIN-
REF+
REF-
NEGV
+2.5V
INPUT
BUFFER
LOGIC
ADC
LED
DRIVER
-2.5V
2.048V
BANDGAP
REFERENCE
CHARGE
PUMP
-2.5V
MAX1365
MAX1367
DAC REF
BUFFER
OUTPUT
DAC
V/I
CONVERTER
CURRENT
SUMMER
AND
AMPLIFIER
5V REGULATOR
OFFSET
GENERATOR
GND REFSELE REF_DAC REG_AMP CMP REG_FORCE REG_VDD
SEGA
SEGG
DIG0(1)
DIG4(4)
LED_EN
LEDG
DAC_VDD
DACVOUT
CONV_IN
4-20OUT
EN_I
EN_BPM
Detailed Description
The MAX1365/MAX1367 low-power, highly integrated
ADCs with LED drivers convert a ±2V differential input
voltage (one count is equal to 100µV for the MAX1365
and 1mV for the MAX1367) with a sigma-delta ADC and
output the result to an LED display. An additional
±200mV input range (one count is equal to 10µV for the
MAX1365 and 100µV for the MAX1367) is available to
measure small signals with finer resolution.
In addition to displaying the results on an LED display,
these devices feature a DAC and V-to-I converter for
4–20mA (or 0 to 16mA) current output that proportional-
ly follows the ADC input. The MAX1365/MAX1367 use
an external depletion-mode NMOS transistor to regulate
7V to 30V for the V/I converter. Use the 4–20mA (or 0 to
16mA) output to drive a remote display, data logger,
PLC input, or other 4–20mA devices in a current loop.
The MAX1365/MAX1367 include a 2.048V reference,
internal charge pump, and a high-accuracy on-chip
oscillator. The devices feature on-chip buffers for the dif-
ferential input signal and external-reference inputs,
allowing direct interface with high-impedance signal
sources. In addition, they use continuous internal offset-
calibration and offer > 100dB of 50Hz and 60Hz line-
noise rejection. Other features include data hold and
peak detection and overrange/underrange detection.
Analog Input Protection
The MAX1365/MAX1367 provide internal protection
diodes that limit the analog input range on AIN+, AIN-,
REF+, and REF- from NEGV to (AVDD + 0.3V). If the
analog input exceeds this range, limit the input current
to 10mA.
Internal Analog Input/Reference Buffers
The MAX1365/MAX1367 analog input/reference buffers
allow the use of high-impedance signal sources. The
input buffers’ common-mode input range allows the ana-
log inputs and the reference to range from -2.2V to +2.2V.
Modulator
The MAX1365/MAX1367 perform analog-to-digital con-
versions using a single-bit, 3rd-order, sigma-delta mod-
ulator. The sigma-delta modulator converts the input
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MAX1367.PDF ] | |
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