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PDF MAX1273 Data sheet ( Hoja de datos )
| Número de pieza | MAX1273 | |
| Descripción | 12-Bit ADCs | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX1273 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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19-2921; Rev 3; 12/11
EVAALVUAAILTAIOBNLEKIT
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
General Description
The MAX1272/MAX1273 multirange 12-bit data-acquisi-
tion systems (DAS) operate with a single 5V supply. The
software-programmable analog input accepts a variety
of voltage ranges: ±10V, ±5V, 0 to 10V, 0 to 5V for the
MAX1272; ±VREF, ±VREF/2, 0 to VREF, 0 to VREF/2 for the
MAX1273. The software-selectable extended analog
input range increases the effective dynamic range to 14
bits and provides the flexibility to interface 4–20mA pow-
ered sensors directly to a single 5V system. In addition,
the MAX1272 provides fault protection to ±12V. Other
features include a 5MHz track/hold (T/H) bandwidth,
87ksps throughput rate, and internal (4.096V) or external
(2.40V to 4.18V) reference.
The MAX1272/MAX1273 serial interfaces connect
directly to SPI/QSPI™/MICROWIRE®-compatible
devices without any external logic.
Four software-programmable power-down modes
(delayed standby, immediate standby, delayed full power-
down, and immediate full power-down) provide low-cur-
rent shutdown between conversions. In standby mode, the
internal reference buffer remains active, thus eliminating
startup delay.
The MAX1272/MAX1273 are available in an 8-pin
µMAX® package. Both devices are available in the
extended (-40°C to +85°C) temperature range.
Applications
Industrial Control Systems
Data-Acquisition Systems
Robotics
Automatic Testing
Battery-Powered Instruments
Medical Instruments
Features
o Four Software-Selectable Input Ranges
MAX1272: 0 to 10V, 0 to 5V, ±10V, ±5V
MAX1273: 0 to VREF, 0 to VREF/2, ±VREF,
±VREF/2
o 12-Bit Resolution, No Missing Codes
o 5V Single-Supply Operation
o SPI/QSPI/MICROWIRE-Compatible 3-Wire
Interface
o 87ksps Sampling Rate
o ±12V Fault-Protected Analog Input (MAX1272)
o Internal (4.096V) or External (2.4V to 4.18V)
Reference
o Low Power
1.5mA at 87ksps
0.4mA at 10ksps
0.2mA at 1ksps
o Four Power-Down Modes
o 8-Pin µMAX Package
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
MAX1272EUA+ -40°C to +85°C
MAX1273EUA+ -40°C to +85°C
8 µMAX
8 µMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
INL
(LSB)
±1
±1
Pin Configuration
TOP VIEW
Typical Application Circuit appears at end of data sheet.
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National Semiconductor Corp.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
SCLK 1 +
DIN 2
VDD 3
GND 4
MAX1272
MAX1273
µMAX
8 DOUT
7 CS
6 REF
5 AIN
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
TIMING CHARACTERISTICS
(VDD = 4.75V to 5.25V, unipolar/bipolar input range, external reference mode, VREF = 4.096V, CREF = 1.0μF, fSCLK = 1.4MHz,
50% duty cycle, CLOAD = 50pF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Figures 1 and 4)
PARAMETERS
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DIN to SCLK Setup
tDS
100 ns
DIN to SCLK Hold
tDH
0 ns
SCLK Fall to Output Data Valid
CS Fall to Output Enable
CS Rise to Output Disable
CS to SCLK Rise Setup
CS to SCLK Rise Hold
SCLK Pulse Width High
tDO
tDV
tTR
tCSS
tCSH
tCH
20 250 ns
100 ns
100 ns
100 ns
0 ns
200 ns
SCLK Pulse Width Low
tCL
200 ns
Note 1: Accuracy specifications tested at VDD = 5V. Performance at power-supply tolerance limit is guaranteed by power-supply
rejection test.
Note 2: Offset error nulled. The ideal last-code transition is (FS - 1.5 LSB).
Note 3: PSRR measured at full scale. Tested at ±10V (MAX1272) and ±4.096V (MAX1273) input ranges.
Note 4: Acquisition and conversion times are dependent on the clock speed.
Typical Operating Characteristics
(Typical operating circuit, BIP = RNG = 1, VDD = 5V, external reference mode, VREF = 4.096V, CREF = 1.0μF, fSCLK = 1.4MHz,
50% duty cycle, 87ksps, TA = +25°C, unless otherwise noted.)
CONVERTING SUPPLY CURRENT
vs. SUPPLY VOLTAGE
5.0
VAIN = 0
4.5
4.0
3.5
3.0 INTERNAL
2.5 REFERENCE
2.0
1.5
1.0
EXTERNAL
REFERENCE
0.5
0
4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25
SUPPLY VOLTAGE (V)
CONVERTING SUPPLY CURRENT
vs. TEMPERATURE
5.0
VAIN = 0
4.5
4.0
3.5
3.0 INTERNAL
2.5 REFERENCE
2.0
1.5
1.0
EXTERNAL
REFERENCE
0.5
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
VAIN = 0
INTERNAL
REFERENCE
EXTERNAL
REFERENCE
-15 10 35 60
TEMPERATURE (°C)
85
_______________________________________________________________________________________ 5
5 Page 
Fault-Protected, 12-Bit ADCs
with Software-Selectable Input Range
CS
SCLK
tCSH
tCSS
tDS
tDH
DIN
DOUT
tDV
•••
tCL tCH
•••
•••
•••
Figure 4. Detailed Serial Interface Timing
tCSH
tDO tTR
CS
DIN
HI-Z
DOUT
SCLK
MSB
ACQUISITION
4 SCLKs
CONVERSION
12 SCLKs
Figure 5. Conversion Timing, 21 Clocks/Conversion
LSB
AUTO STANDBY
HI-Z
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX1273.PDF ] | |
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