MAX1365ECM+T Maxim Integrated Products, MAX1365ECM+T Datasheet - Page 11

• Manufacturer Part Number: MAX1365ECM+T
• Description: IC PANEL METER 4.5 DIG 48LQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1365ECM+T

• Display Type: LED
• Configuration: 7 Segment
• Digits Or Characters: A/D 4.5 Digits
• Voltage - Supply: 2.7 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Interface: -

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,
NEGV
REF+
AIN+
REF-
AIN-
______________________________________________________________________________________
Stand-Alone, 4.5-/3.5-Digit Panel Meters
AV
DD
Detailed Description
MAX1365
MAX1367
CHARGE
BUFFER
+2.5V
INPUT
-2.5V
PUMP
DV
DD
INTREF
-2.5V
GND
PEAK
REFERENCE
BANDGAP
2.048V
RANGE
ADC
DPON DPSET1 DPSET 2
DAC REF
REFSELE
BUFFER
LOGIC
REF_DAC
OUTPUT
HOLD
DAC
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.
The MAX1365/MAX1367 provide internal protection
diodes that limit the analog input range on AIN+, AIN-,
REF+, and REF- from NEGV to (AV
analog input exceeds this range, limit the input current
to 10mA.
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.
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
REG_AMP
CS_DAC
Internal Analog Input/Reference Buffers
with 4–20mA Output
5V REGULATOR
CMP
DACDATA_SEL
REG_FORCE
CONVERTER
DRIVER
V/I
LED
SET
REG_VDD
LEDV
Functional Diagram
GENERATOR
AMPLIFIER
CURRENT
SUMMER
OFFSET
Analog Input Protection
AND
DD
SEGA
SEGG
DIG0(1)
DIG4(4)
LED_EN
LEDG
DAC_VDD
DACVOUT
CONV_IN
4-20OUT
EN_I
EN_BPM
+ 0.3V). If the
Modulator
11