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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1271 Datasheet

Serial 12-Bit ADCs

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MAX1271 pdf
19-4782; Rev 2; 9/04
EVAALVUAAILTAIOBNLEKIT
Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
General 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 can 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 switch-
ing 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 fea-
tures 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) and two software-
programmable power-down modes, standby (STBYPD)
or full power-down (FULLPD), are provided for low-cur-
rent shutdown between conversions. In standby mode,
the reference buffer remains active, eliminating startup
delays.
The MAX1270/MAX1271 are available in 24-pin narrow
PDIP or space-saving 28-pin SSOP packages.
Applications
Industrial Control Systems
Data-Acquisition Systems
Battery-Powered
Instruments
Automatic Testing
Robotics
Medical Instruments
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
INL
(LSB)
MAX1270ACNG 0°C to +70°C 24 Narrow PDIP
MAX1270BCNG 0°C to +70°C 24 Narrow PDIP
±0.5
±1
MAX1270ACAI 0°C to +70°C 28 SSOP
±0.5
MAX1270BCAI 0°C to +70°C 28 SSOP
±1
Ordering Information continued at end of data sheet.
Features
12-Bit Resolution, 0.5 LSB 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 PDIP or 28-Pin SSOP Packages
Typical Operating Circuit
+5V
0.1µF
VDD
ANALOG
INPUTS
SHDN
CH0
CH1
CH2
CH3 MAX1270
CH4 MAX1271
CH5
CH6
CH7
REF
REFADJ
CS
SCLK
DIN
DOUT
SSTRB
4.7µF
0.01µF
DGND AGND
MC68HCXX
I/O
SCK
MOSI
MISO
Pin Configurations appear at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1271 Datasheet

Serial 12-Bit ADCs

No Preview Available !

MAX1271 pdf
Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
ABSOLUTE MAXIMUM RATINGS
VDD to AGND............................................................-0.3V to +6V
AGND to DGND.....................................................-0.3V to +0.3V
CH0–CH7 to AGND ......................................................... ±16.5V
REF, REFADJ to AGND ..............................-0.3V to (VDD + 0.3V)
SSTRB, DOUT to DGND.............................-0.3V to (VDD + 0.3V)
SHDN, CS, DIN, SCLK to DGND..............................-0.3V to +6V
Max Current into Any Pin ....................................................50mA
Continuous Power Dissipation (TA = +70°C)
24-Pin Narrow DIP (derate 13.33mW/°C above +70°C)..1067mW
28-Pin SSOP (derate 9.52mW/°C above +70°C) ..........762mW
Operating Temperature Ranges
MAX127_C_ _......................................................0°C to +70°C
MAX127_E_ _......................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = +5.0V ±5%; unipolar/bipolar range; external reference mode, VREF = +4.096V; 4.7µF at REF; external clock; fCLK = 2.0MHz,
50% duty cycle (MAX127_B); fCLK = 1.8MHz, 50% duty cycle (MAX127_A); 18 clock/conversion cycle, TA = TMIN to TMAX, unless
otherwise noted. Typical values are TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
ACCURACY (Note 1)
Resolution
Integral Nonlinearity
Differential Nonlinearity
Offset Error
Channel-to-Channel Offset Error
Matching
Gain Error (Note 2)
Gain Error Temperature
Coefficient (Note 2)
INL
DNL
MAX127_A
MAX127_B
No missing codes over temperature
Unipolar
MAX127_A
MAX127_B
Bipolar
MAX127_A
MAX127_B
Unipolar
Bipolar
Unipolar
MAX127_A
MAX127_B
Bipolar
MAX127_A
MAX127_B
Unipolar, external reference
Bipolar, external reference
12 Bits
±0.5
±1.0
LSB
±1 LSB
±3
±5
LSB
±5
±10
±0.1
±0.3
LSB
±7
±10
±7 LSB
±10
±3
±5 ppm/°C
DYNAMIC SPECIFICATIONS (10kHz sine-wave input, ±10VP-P (MAX1270), or ±4.096VP-P (MAX1271), fSAMPLE = 110ksps
(MAX127_B), fSAMPLE = 100ksps (MAX127_A))
Signal-to-Noise + Distortion Ratio SINAD
70 dB
Total Harmonic Distortion
THD Up to the 5th harmonic
-87 -78
dB
Spurious-Free Dynamic Range
SFDR
80 dB
Channel-to-Channel Crosstalk
Aperture Delay
50kHz (Note 3)
DC, VIN = ±16.5V
External clock mode
-86
dB
-96
15 ns
Aperture Jitter
External clock mode
Internal clock mode
<50 ps
10 ns
2 _______________________________________________________________________________________


Part Number MAX1271
Description Serial 12-Bit ADCs
Maker Maxim Integrated
Total Page 20 Pages
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