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MAX1270, MAX1270A, MAX1270B, MAX1271, MAX1271A, MAX1271B
Multirange, +5V, 8-Channel, Serial 12-Bit ADCs
12-Bit, 8-Channel, Serial ADCs Have +/-17V Fault-Protected Inputs
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Status
Active: In Production.
Description
The MAX1270/MAX1271 are multirange, 12-bit data-acquisition systems (DAS) that require only a single +5V supply for operation, yet accept signals at their analog inputs that may span above the power-supply rail and below ground. These systems provide eight analog input channels that are independently software programmable for a variety of ranges: ±10V, ±5V, 0 to +10V, 0 to +5V for the MAX1270; ±VREF, ±VREF/2, 0 to VREF, 0 to VREF/2 for the MAX1271. This range switching increases the effective dynamic range to 14 bits and provides the flexibility to interface 4-20mA, ±12V, and ±15V powered sensors directly to a single +5V system. In addition, these converters are fault protected to ±16.5V; a fault condition on any channel will not affect the conversion result of the selected channel. Other features include a 5MHz bandwidth track/hold, software-selectable internal/external clock, 110ksps throughput rate, and internal 4.096V or external reference operation.
The MAX1270/MAX1271 serial interface directly connects to SPI™/QSPI™ and MICROWIRE™ devices without external logic.
A hardware shutdown input (SHDN-bar) and two software-programmable power-down modes, standby (STBYPD) or full power-down (FULLPD), are provided for low-current shutdown between conversions. In standby mode, the reference buffer remains active, eliminating start-up delays.
The MAX1270/MAX1271 are available in 24-pin narrow DIP or space-saving 28-pin SSOP packages.
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Data Sheet
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An evaluation kit is available: MAX1270EVC16, MAX1270EVKIT, MAX1270EVSYS
Key Features
- 12-Bit Resolution, 1/2LSB Linearity
- +5V Single-Supply Operation
- SPI/QSPI and MICROWIRE-Compatible 3-Wire Interface
- Four Software-Selectable Input Ranges
- MAX1270: 0 to +10V, 0 to +5V, ±10V, ±5V
- MAX1271: 0 to VREF, 0 to VREF/2, ±VREF, ±VREF/2
- Eight Analog Input Channels
- 110ksps Sampling Rate
- ±16.5V Overvoltage-Tolerant Input Multiplexer
- Internal 4.096V or External Reference
- Two Power-Down Modes
- Internal or External Clock
- 24-Pin Narrow DIP or 28-Pin SSOP Packages
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Applications/Uses
- Automatic Testing
- Battery-Powered Instruments
- Data Acquisition Systems
- Industrial Control Systems
- Medical Instruments
- Robotics
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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 |
Internal VREF
(V) |
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 |
nominal |
min |
max |
max |
max |
See Notes |
| MAX1270 |
12 |
8 |
110 |
SPI |
S.E. Only |
4.096 |
2.4 |
4.18 |
10 |
10 |
70 |
70 |
-87 |
80 |
1 |
1 |
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$12.22 @1k |
| MAX1271 |
4.096 |
2.048 |
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$12.22 @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
Didn't Find What You Need?
Information Index
Document Ref.: 19-4782
Rev 2;
2005-03-02
This page last modified: 2007-07-20
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