MAX1415 Datasheet, PDF (1/36 Pages) Maxim Integrated Products – 16-Bit, Low-Power, 2-Channel, Sigma-Delta ADCs

19-3163; Rev 0; 1/04
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16-Bit, Low-Power, 2-Channel,
Sigma-Delta ADCs
General Description
The MAX1415/MAX1416 low-power, 2-channel, serial-
output analog-to-digital converters (ADCs) use a sigma-
delta modulator with a digital filter to achieve 16-bit
resolution with no missing codes. These ADCs are pin-
compatible upgrades to the MX7705/AD7705. The
MAX1415/MAX1416 feature an internal oscillator (1MHz
or 2.4576MHz), an on-chip input buffer, and a program-
mable gain amplifier (PGA). The devices offer an SPI™-/
QSPI™-/MICROWIRE™-compatible serial interface.
The MAX1415 requires a single 2.7V to 3.6V supply, and
the MAX1416 requires a single 4.75V to 5.25V supply.
The operating supply current is 400µA (max) with a 3V
supply. Power-down mode reduces the supply current to
2µA (typ). When operating with a supply of 3V, the power
dissipation is less than 1.44mW, making the MAX1415
ideal for battery-powered applications.
Self-calibration and system calibration allow the
MAX1415/MAX1416 to correct for gain and offset errors.
Excellent DC performance (±0.0015% FSR INL) and low
noise (700nV in unbuffered mode) make the MAX1415/
MAX1416 ideal for measuring low-frequency signals with
a wide dynamic range. These devices accept fully differ-
ential bipolar/unipolar inputs. An internal input buffer
allows for input signals with high source impedances. An
on-chip digital filter, with a programmable cutoff and out-
put data rate, processes the output of the sigma-delta
modulator. The first notch frequency of the digital filter is
chosen to provide 150dB rejection of common-mode
50Hz or 60Hz noise and 98dB rejection of normal-mode
50Hz or 60Hz noise. A PGA and digital filtering allow sig-
nals to be directly acquired with little or no signal-condi-
tioning requirements.
The MAX1415/MAX1416 are available in 16-pin PDIP,
SO, and TSSOP packages.
Applications
Industrial Instruments
Weigh Scales
Strain-Gauge Measurements
Loop-Powered Systems
Flow and Gas Meters
Medical Instrumentation
Pressure Transducers
Thermocouple Measurements
RTD Measurements
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Features
♦ 16-Bit Sigma-Delta ADCs
♦ Two Fully Differential Input Channels
♦ 0.0015% Integral Nonlinearity with No Missing
Codes
♦ Internal Analog Input Buffers
♦ Programmable Gain Amplifier (PGA) from 1 to 128
♦ Internal Oscillator (2.4576MHz or 1MHz)
♦ Single 2.7V to 3.6V (MAX1415) or 4.75V to 5.25V
(MAX1416) Supply
♦ Low Power
1mW max, 3V Supply
2µA (typ) Power-Down Current
♦ SPI™-/QSPI™-/MICROWIRE™-Compatible 3-Wire
Serial Interface
♦ Pin Compatible with MX7705/AD7705
♦ 16-Pin PDIP, SO, and TSSOP Packages
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
V_DD (V)
MAX1415ENE* -45°C to +85°C 16 PDIP
3
MAX1415EWE* -45°C to +85°C 16 Wide SO
3
MAX1415EUE -45°C to +85°C 16 TSSOP
3
MAX1415AENE* -45°C to +85°C 16 PDIP
3
MAX1415AEWE* -45°C to +85°C 16 Wide SO
3
MAX1415AEUE* -45°C to +85°C 16 TSSOP
3
MAX1415CNE*
0°C to +70°C 16 PDIP
3
MAX1415CWE*
0°C to +70°C 16 Wide SO
3
MAX1415CUE*
0°C to +70°C 16 TSSOP
3
*Future product—contact factory for availability.
Ordering Information continued at end of data sheet.
Pin Configuration
TOP VIEW
SCLK ₁
CLKIN 2
CLKOUT 3
CS 4
RESET 5
AIN2+ 6
AIN1+ 7
AIN1- 8
MAX1415
MAX1416
16 GND
15 VDD
14 DIN
13 DOUT
12 DRDY
11 AIN2-
10 REF-
9 REF+
PDIP/SO/TSSOP
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