MAX1415, MAX1416 16-Bit, Low-Power, 2-Channel, Sigma-Delta ADCs

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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 programmable 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 differential 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 output 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 signals to be directly acquired with little or no signal-conditioning requirements.

The MAX1415/MAX1416 are available in 16-pin PDIP, SO, and TSSOP packages.

Key Features

Applications/Uses

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

	Flow and Gas Meters
	Industrial Instruments
	Loop-Powered Systems
	Medical Instrumentation
	Pressure Transducers
	RTD Measurements
	Strain-Gauge Measurements
	Thermocouple Measurements
	Weigh Scales

Key Specifications: Sigma-Delta ADCs

Part Number

Resolution (Bits)

Input Channels

Max. DNL (LSB)

Max. INL (±%FSR)

Conversion Rate (sps)

Max. Conversion Time (µs)

Typ. Supply Current (mA)

Standby Mode

Ref. (V)

Low Power

Special Features

Supply Voltage (V)

Data Bus Interface

EV-Kit

RoHS Available

Package

Operating Temp. Range (°C)

Price^**

MAX1415

0.03

500

2000

0.32

Yes

Ext

Yes

Differential Inputs Unipolar/Bipolar
Internal Clock

Serial

Yes

PDIP/16
SOIC/16
TSSOP/16

-40 to +85

$4.33 @ 1k

MAX1416

$4.33 @ 1k

See All Sigma-Delta ADCs (12)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.