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
Features
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
ꢀ 416ksps, 8-Bit Successive-Approximation
Register (SAR) ADCs
ꢀ Single True-Differential Analog Input Channel
with Unipolar-/Bipolar-Selected Input (MAX1391)
0.743mW (V
= +1.5V) at the maximum conversion
DD
ꢀ Dual Single-Ended Input Channel with Channel-
rate of 416ksps. AutoShutdown™ between conversions
reduces power consumption at slower throughput rates.
Selected Input (MAX1394)
ꢀ ±±0. ꢀSB Iꢁꢀ, ±±0. ꢀSB Dꢁꢀ, ꢁo Missing Codes
ꢀ ±±0.2 ꢀSB Total Unadꢂusted Error (TUE)
ꢀ 49dB SIꢁAD at 1±±kHz Input Frequency
ꢀ Single-Supply Voltage (+102V to +306V)
ꢀ ±097mW at 416ksps, 108V
The MAX1391/MAX1394 require an external reference
REF
V
that has a wide range from 0.6V to V . The
DD
MAX1391 provides one true-differential analog input
that accepts signals ranging from 0 to V (unipolar
REF
mode) or
vides two single-ended inputs that accept signals rang-
ing from 0 to V . Analog conversion results are
V
/2 (bipolar mode). The MAX1394 pro-
REF
REF
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.
ꢀ ±0.3±mW at 1±±ksps, 108V
ꢀ 301µW at 1ksps, 108V
ꢀ < 1µA Shutdown Current
ꢀ External Reference (±06V to V
)
DD
ꢀ AutoShutdown Between Conversions
ꢀ SPI-/QSPI-/MICROWIRE-/DSP-Compatible,
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.
3- or 4-Wire Serial Interface
ꢀ Small (3mm x 3mm), 1±-Pin TDFꢁ
Applications
Portable Datalogging
Data Acquisition
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
Medical Instruments
Battery-Powered Instruments
Process Control
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
TEMP RAꢁGE
-40°C to +85°C
-55°C to +125°C
-40°C to +85°C
-55°C to +125°C
PIꢁ-PACKAGE
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
AꢁAꢀOG IꢁPUTS
1-CH DIFF
1-CH DIFF
2-CH S/E
TOP MARK
PKG CODE
T1033-1
T1033-1
T1033-1
T1033-1
MAX1391ETB
MAX1391MTB**
MAX1394ETB
MAX1394MTB**
AOX
—
APA
—
2-CH S/E
*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.