MAX1391 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 1.5V to 3.6V, 416ksps, 1-Channel True-Differential/2-Channel Single-Ended, 8-Bit, SAR ADCs

19-3720; Rev 0; 11/06
1.5V to 3.6V, 416ksps, 1-Channel True-Differential/
2-Channel Single-Ended, 8-Bit, SAR ADCs
General Description
The MAX1391/MAX1394 micropower, serial-output,
8-bit, analog-to-digital converters (ADCs) operate with a
single power supply from +1.5V to +3.6V. These ADCs
feature automatic shutdown, fast wake-up, and a high-
speed 3-wire interface. Power consumption is only
0.743mW (V_DD = +1.5V) at the maximum conversion
rate of 416ksps. AutoShutdown™ between conversions
reduces power consumption at slower throughput rates.
The MAX1391/MAX1394 require an external reference
V_REF that has a wide range from 0.6V to V_DD. The
MAX1391 provides one true-differential analog input
that accepts signals ranging from 0 to V_REF (unipolar
mode) or ±V_REF/2 (bipolar mode). The MAX1394 pro-
vides two single-ended inputs that accept signals rang-
ing from 0 to V_REF. Analog conversion results are
available through a 5MHz 3-wire SPI™-/QSPI™-/
MICROWIRE™-/digital signal processor (DSP)-compati-
ble serial interface. Excellent dynamic performance,
low voltage, low power, ease of use, and small pack-
age sizes make these converters ideal for portable bat-
tery-powered data-acquisition applications, as well as
other applications that demand low-power consumption
and minimal space.
The MAX1391/MAX1394 are available in a space-sav-
ing (3mm x 3mm), 10-pin TDFN package. The parts
operate over the extended (-40°C to +85°C) and mili-
tary (-55°C to +125°C) temperature ranges.
Applications
Portable Datalogging
Data Acquisition
Medical Instruments
Battery-Powered Instruments
Process Control
Features
o 416ksps, 8-Bit Successive-Approximation
Register (SAR) ADCs
o Single True-Differential Analog Input Channel
with Unipolar-/Bipolar-Selected Input (MAX1391)
o Dual Single-Ended Input Channel with Channel-
Selected Input (MAX1394)
o ±0.2 LSB INL, ±0.2 LSB DNL, No Missing Codes
o ±0.25 LSB Total Unadjusted Error (TUE)
o 49dB SINAD at 100kHz Input Frequency
o Single-Supply Voltage (+1.5V to +3.6V)
o 0.97mW at 416ksps, 1.8V
o 0.230mW at 100ksps, 1.8V
o 3.1µW at 1ksps, 1.8V
o < 1µA Shutdown Current
o External Reference (0.6V to V_DD)
o AutoShutdown Between Conversions
o SPI-/QSPI-/MICROWIRE-/DSP-Compatible,
3- or 4-Wire Serial Interface
o Small (3mm x 3mm), 10-Pin TDFN
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Ordering Information
PART
MAX1391ETB
MAX1391MTB**
MAX1394ETB
MAX1394MTB**
TEMP RANGE
-40°C to +85°C
-55°C to +125°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
ANALOG INPUTS
1-CH DIFF
1-CH DIFF
2-CH S/E
2-CH S/E
TOP MARK
AOX
—
APA
—
PKG CODE
T1033-1
T1033-1
T1033-1
T1033-1
*EP = Exposed pad.
**Future product—contact factory for availability.
________________________________________________________________ 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.