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MAX1391, MAX1394
1.5V to 3.6V, 416ksps, 1-Channel True-Differential/2-Channel Single-Ended, 8-Bit, SAR ADCs
Ultra-Low Power and Supply Voltage Make These ADCs Ideal for Battery-Powered Applications
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Status
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 (VDD = +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 VREF that has a wide range from 0.6V to VDD. The MAX1391 provides one true-differential analog input that accepts signals ranging from 0 to VREF (unipolar mode) or ± VREF/2 (bipolar mode). The MAX1394 provides two single-ended inputs that accept signals ranging from 0 to VREF. Analog conversion results are available through a 5MHz 3-wire SPI™-/QSPI™-/MICROWIRE™-/digital signal processor (DSP)-compatible serial interface. Excellent dynamic performance, low voltage, low power, ease of use, and small package sizes make these converters ideal for portable battery-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-saving (3mm x 3mm), 10-pin TDFN package. The parts operate over the extended (-40°C to +85°C) temperature range.
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Data Sheet
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An evaluation kit is available: MAX1396EVKIT
Key Features
- 416ksps, 8-Bit Successive-Approximation Register (SAR) ADCs
- Single True-Differential Analog Input Channel with Unipolar-/Bipolar-Selected Input (MAX1391)
- Dual Single-Ended Input Channel with Channel-Selected Input (MAX1394)
- ±0.2 LSB INL, ±0.2 LSB DNL, No Missing Codes
- ±0.25 LSB Total Unadjusted Error (TUE)
- 49dB SINAD at 100kHz Input Frequency
- Single Supply Voltage (+1.5V to +3.6V)
- 0.97mW at 416ksps, 1.8V
- 0.230mW at 100ksps, 1.8V
- 3.1µW at 1ksps, 1.8V
- < 1µA Shutdown Current
- External Reference (0.6V to VDD)
- AutoShutdown Between Conversions
- SPI-/QSPI-/MICROWIRE-/DSP-Compatible, 3- or 4-Wire Serial Interface
- Small (3mm x 3mm), 10-Pin TDFN
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Applications/Uses
- Battery-Powered Instruments
- Data Acquisition
- Medical Instruments
- Portable Data Logging
- Process Control
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Key Specifications:
| Precision ADCs (< 5Msps) |
| Part Number |
Resolution
(bits) |
Input Chan. |
Conv. Rate
(ksps) |
Data Bus
(bits) |
Diff/S.E. Input |
External VREF
(V) |
External VREF
(V) |
Unipolar VIN
(V) |
Bipolar VIN
(±V) |
SNR
(dB) |
SINAD
(dB) |
THD
(dB) |
SFDR
(dB) |
DNL
(±LSB) |
INL
(±LSB) |
Package/Pins |
Budgetary Price |
| ADC |
max |
min |
max |
max |
max |
See Notes |
| MAX1391 |
8 |
1 |
400 |
SPI |
Diff. Only |
0.6 |
3.6 |
3.6 |
1.8 |
49 |
49 |
-65 |
66 |
0.2 |
0.2 |
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$1.15 @1k |
| MAX1394 |
2 |
S.E. Only |
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$1.15 @1k |
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See All Precision ADCs (< 5Msps) (417)
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Pricing 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.
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Diagram
 Typical Operating Circuit
More Information
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Information Index
Document Ref.: 19-3720
Rev 1;
2010-01-05
This page last modified: 2010-01-05
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