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KIT |
MANUAL |
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EVALUATION |
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SHEET |
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DATA |
Multirange, +5V, 8-Channel, |
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FOLLOWS |
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Serial 12-Bit ADCs
Description
multirange, 12-bit datarequire only a single +5V signals at their analog power-supply rail and provide eight analog software pro- ±10V, ±5V, 0 to ±VREF, ±VREF/2, 0 to
. This range switchrange to 14 bits and 4–20mA, ±12V, and to a single +5V system. are fault protected to channel will not affect channel. Other featrack/hold, software110ksps throughput reference opera-
interface directly condevices with-
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
) and two softwarestandby (STBYPD) are provided for low-cur-
. In standby mode, eliminating start-up
in 24-pin narrow packages.
Applications
Ordering Information
-PACKAGE |
INL |
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(LSB) |
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Narrow Plastic DIP |
±1/2 |
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Narrow Plastic DIP |
±1 |
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SSOP |
±1/2 |
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MAX1270BCAI 0°C to +70°C 28 SSOP |
±1 |
Ordering Information continued at end of data sheet.
Typical Operating Circuit
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+5V |
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0.1 F |
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VDD |
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SHDN |
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CH0 |
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CH1 |
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ANALOG |
CH2 |
MAX1270 |
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CH3 |
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INPUTS |
CH4 |
MAX1271 |
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CH5 |
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CH6 |
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CH7 |
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MC68HCXX |
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CS |
I/O |
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SCLK |
SCK |
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REF |
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DIN |
MOSI |
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DOUT |
MISO |
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REFADJ |
SSTRB |
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4.7 F |
0.01 F |
DGND |
AGND |
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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 7-169
MAX1270/MAX1271
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX1270/MAX1271
Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
ABSOLUTE MAXIMUM RATINGS
VDD to AGND............................................................ |
-0.3V to +6V |
Operating Temperature Ranges |
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AGND to DGND..................................................... |
-0.3V to +0.3V |
MAX127_C_ _ ...................................................... |
0°C to +70°C |
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CH0–CH7 to AGND ......................................................... |
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±16.5V |
MAX127_E_ _.................................................... |
-40°C to +85°C |
REF, REFADJ to AGND .............................. |
-0.3V to (VDD + 0.3V) |
Storage Temperature Range ............................ |
-65°C to +150°C |
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SSTRB, DOUT to DGND............................. |
-0.3V to (VDD + 0.3V) |
Lead Temperature (soldering, 10sec) ............................ |
+300°C |
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SHDN, CS, DIN, SCLK to DGND.............................. |
-0.3V to +6V |
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Max Current into Any Pin .................................................... |
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50mA |
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Continuous Power Dissipation (TA = +70°C) |
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24-Pin Narrow DIP (derate 13.33mW/°C above +70°C) |
..1067mW |
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28-Pin SSOP (derate 9.52mW/°C above +70°C) .......... |
762mW |
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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), 18 clock/conversion cycle, 110ksps; TA = TMIN to TMAX; unless otherwise noted. Typical values are TA = +25°C.)
PARAMETERS |
SYMBOL |
CONDITIONS |
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TYP |
MAX |
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UNITS |
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ACCURACY ((Note 1)) |
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Resolution |
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12 |
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bits |
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Integral Nonlinearity |
INL |
MAX127_A |
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MAX127_B |
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±1.0 |
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Differential Nonlinearity |
DNL |
No missing codes over temperature |
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±1 |
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LSB |
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Unipolar |
MAX127_A |
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Offset Error |
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MAX127_B |
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±5 |
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Bipolar |
MAX127_A |
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MAX127_B |
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Channel-to-Channel Offset |
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Unipolar |
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±0.1 |
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LSB |
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Error Matching |
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Bipolar |
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Unipolar |
MAX127_A |
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Gain Error |
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MAX127_B |
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(Note 2) |
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MAX127_A |
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MAX127_B |
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Gain Error Temperature |
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Unipolar, external reference |
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±3 |
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ppm/°C |
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Coefficient (Note 2) |
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Bipolar, external reference |
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±5 |
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DYNAMIC SPECIFICATIONS (10kHz sine-wave input, ±10Vp-p (MAX1270), or ±4.096Vp-p |
(MAX1271), fSAMPLE = 110ksps) |
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Signal-to-Noise + Distortion |
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SINAD |
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70 |
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Ratio |
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Total Harmonic Distortion |
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THD |
Up to the 5th harmonic |
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-87 |
-78 |
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Spurious-Free Dynamic Range |
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SFDR |
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Channel-to-Channel Crosstalk |
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50kHz (Note 3) |
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-86 |
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dB |
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DC, VIN = ±16.5V |
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-96 |
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Aperture Delay |
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External clock mode |
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15 |
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Aperture Jitter |
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External clock mode |
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<50 |
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ps |
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Internal clock mode |
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10 |
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7-170 ___________________________________________________________________________________
Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
ELECTRICAL CHARACTERISTICS (continued)
(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), 18 clock/conversion cycle, 110ksps; TA = TMIN to TMAX; unless otherwise noted. Typical values are TA = +25°C.)
PARAMETERS |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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ANALOG INPUT
Track/Hold Acquisition Time |
tACQ |
fCLK = 2.0MHz |
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3 |
µs |
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±10V or ±VREF range |
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5 |
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Small-Signal Bandwidth |
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-3dB |
±5V or ±VREF/2 range |
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2.5 |
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MHz |
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rolloff |
0 to 10V or 0 to VREF range |
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2.5 |
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0 to 5V or 0 to VREF/2 range |
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1.25 |
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RNG = 1 |
0 |
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10 |
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Unipolar |
MAX1270 |
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RNG = 0 |
0 |
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5 |
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RNG = 1 |
0 |
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VREF |
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Table 3 |
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MAX1271 |
0 |
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VREF/2 |
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Input Voltage Range |
VIN |
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RNG = 0 |
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V |
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RNG = 1 |
-10 |
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10 |
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Bipolar |
MAX1270 |
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RNG = 0 |
-5 |
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5 |
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RNG = 1 |
-VREF |
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VREF |
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Table 3 |
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MAX1271 |
-VREF/2 |
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VREF/2 |
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0 to 10V range |
-10 |
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720 |
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Unipolar |
MAX1270 |
-10 |
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360 |
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0 to 5V range |
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MAX1271 |
-10 |
0.1 |
10 |
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Input Current |
IIN |
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±10V range |
-1200 |
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720 |
µA |
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MAX1270 |
-600 |
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360 |
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Bipolar |
±5V range |
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±VREF range |
-1200 |
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10 |
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MAX1271 |
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±VREF/2 range |
-600 |
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10 |
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Dynamic Resistance |
∆VIN/∆IIN |
Unipolar |
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21 |
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kΩ |
Bipolar |
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16 |
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Input Capacitance |
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(Note 4) |
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40 |
pF |
INTERNALREFERENCE |
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REF Output Voltage |
VREF |
TA = +25°C |
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4.076 |
4.096 |
4.116 |
V |
REF Output Tempco |
TC VREF |
MAX1270_C/MAX1271_C |
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±15 |
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ppm/°C |
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MAX1270_E/MAX1271_E |
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±30 |
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Output Short Circuit Current |
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30 |
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mA |
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Load Regulation (Note 5) |
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0 to 0.5mA output current |
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10 |
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Capacitive Bypass at REF |
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4.7 |
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Capacitive Bypass at REFADJ |
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µF |
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REFADJ Output Voltage |
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2.465 2.500 |
2.535 |
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V |
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REFADJ Adjustment Range |
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Figure 1 |
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±1.5 |
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Buffer Voltage Gain |
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1.638 |
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V/V |
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REFERENCEINPUT(Reference |
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buffer disabled, reference input applied to REF) |
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Input Voltage Range |
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2.40 |
4.18 |
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V |
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Input Current |
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VREF = 4.18V |
Normal or STBYPD |
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400 |
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µA |
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FULLPD |
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1 |
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MAX1270/MAX1271
____________________________________________________________________________________ 7-171
MAX1270/MAX1271
Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
ELECTRICAL CHARACTERISTICS (continued)
(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), 18 clock/conversion cycle, 110ksps; TA = TMIN to TMAX; unless otherwise noted. Typical values are TA = +25°C.)
PARAMETERS |
SYMBOL |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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Input Resistance |
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VREF = 4.18V |
Normal or STBYPD |
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10 |
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kΩ |
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FULLPD |
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4.18 |
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MΩ |
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REFADJ Threshold for Buffer |
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VDD - 0.5 |
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V |
Disable |
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POWER REQUIREMENT |
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Supply Voltage |
VDD |
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4.75 |
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5.25 |
V |
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Normal |
Bipolar range |
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18 |
mA |
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Supply Current |
IDD |
Unipolar range |
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6 |
10 |
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STBYPD power down mode (Note 6) |
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700 |
850 |
µA |
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FULLPD power down mode |
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120 |
220 |
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Power-Supply Rejection |
PSRR |
External reference = 4.096V |
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±0.1 |
±0.5 |
LSB |
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Ratio (Note 7) |
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Internal reference |
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±0.5 |
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TIMING |
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External Clock Frequency |
fCLK |
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0.1 |
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2.0 |
MHz |
Range |
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Acquisition Phase |
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External clock mode (Note 8) |
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3 |
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µs |
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Internal clock mode, Figure 9 |
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3 |
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5 |
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Conversion Time |
tCONV |
External clock mode (Note 8) |
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6 |
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µs |
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Internal clock mode, Figure 9 |
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6 |
7.7 |
11 |
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Throughput Rate |
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External clock mode |
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110 |
ksps |
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Internal clock mode |
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43 |
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Bandgap Reference Start-Up |
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Power-up |
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200 |
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Time (Note 9) |
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To 0.1mV, REF |
CREF = 4.7µF |
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8 |
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Reference Buffer Settling Time |
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bypass capacitor |
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ms |
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CREF = 33µF |
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60 |
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fully discharged |
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DIGITAL INPUTS:DIN,SCLK, CS, SHDN |
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Input High Threshold Voltage |
VIH |
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2.4 |
V |
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Input Low Threshold Voltage |
VIL |
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0.8 |
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V |
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Input Hysteresis |
VHYS |
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0.2 |
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V |
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Input Leakage Current |
IIN |
VIN = 0 to VDD |
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-10 |
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10 |
µA |
Input Capacitance |
CIN |
(Note 4) |
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15 |
pF |
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DIGITAL OUTPUTS:DOUT, SSTRB |
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Output Voltage Low |
VOL |
ISINK = 5mA |
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0.4 |
V |
ISINK = 16mA |
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0.4 |
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Output Voltage High |
VOH |
ISOURCE = 0.5mA |
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VDD - 0.5 |
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V |
Three-State Leakage Current |
IL |
CS = VDD |
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-10 |
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10 |
µA |
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Three-State Output Capacitance |
COUT |
CS = VDD (Note 4) |
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15 |
pF |
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7-172 ___________________________________________________________________________________
Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
TIMING CHARACTERISTICS
(VDD = +4.75V to +5.25; unipolar/bipolar range; external reference mode, VREF = +4.096V; 4.7µF at REF; external clock, fCLK = 2MHz; TA = TMIN to TMAX, unless otherwise noted. Typical values are TA = +25°C.) (Figures 2, 5, 7, 10)
PARAMETERS |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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DIN to SCLK Setup |
tDS |
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100 |
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ns |
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DIN to SCLK Hold |
tDH |
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0 |
ns |
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SCLK Fall to Output Data Valid |
tDO |
CLOAD = 100pF |
20 |
|
170 |
ns |
CS Fall to Output Enable |
tDV |
CLOAD = 100pF |
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120 |
ns |
CS Rise to Output Disable |
tTR |
CLOAD = 100pF |
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100 |
ns |
CS to SCLK Rise Setup |
tCSS |
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100 |
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ns |
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CS to SCLK Rise Hold |
tCSH |
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0 |
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ns |
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SCLK Pulse Width High |
tCH |
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200 |
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ns |
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SCLK Pulse Width Low |
tCL |
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200 |
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ns |
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SCLK Fall to SSTRB |
tSSTRB |
CLOAD = 100pF |
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200 |
ns |
CS to SSTRB Output Enable |
tSDV |
CLOAD = 100pF |
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200 |
ns |
External clock mode only |
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CS to SSTRB Output Disable |
tSTR |
CLOAD = 100pF |
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200 |
ns |
External clock mode only |
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SSTRB Rise to SCLK Rise |
tSCK |
Internal clock mode only |
0 |
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ns |
(Note 4) |
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Note 1: Accuracy specifications tested at VDD = +5.0V. Performance at power-supply tolerance limit is guaranteed by Power-Supply Rejection test.
Note 2: External reference: VREF = 4.096V, offset error nulled. Ideal last-code transition = FS - 3/2LSB.
Note 3: Ground “on” channel; sine wave applied to all “off” channels. VIN = ±5V (MAX1270), VIN = ±4V (MAX1271). Note 4: Guaranteed by design, not production tested.
Note 5: Use static external loads during conversion for specified accuracy. Note 6: Tested using internal reference.
Note 7: PSRR measured at full scale. Tested for the ±10V (MAX1270) and ±4.096V (MAX1271) input ranges.
Note 8: Acquisition phase and conversion time are dependent on the clock period; clock has 50% duty cycle (Figure 6). Note 9: Not production tested. Provided for design guidance only.
MAX1270/MAX1271
____________________________________________________________________________________ 7-173
MAX1270/MAX1271
Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
Typical Operating Characteristics
(Typical Operating Circuit, VDD = +5V; external reference mode, VREF = +4.096V; 4.7µF at REF; external clock, fCLK = 2MHz; 110ksps; TA = +25°C; unless otherwise noted.)
SUPPLY CURRENT (mA)
25
20
15
10
5
0
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX1270/1 toc01 |
(mA) |
|
SUPPLY CURRENT |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. TEMPERATURE
6.5 |
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MAX1270/1 toc02 |
( A) |
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6.3 |
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5.9 |
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SUPPLYCURRENT |
6.1 |
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STANDBY |
5.7 |
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5.5 |
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-40 |
-15 |
10 |
35 |
60 |
85 |
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TEMPERATURE (°C)
750
650
550
450
350
250
150
50
-40
STANDBY SUPPLY CURRENT vs. TEMPERATURE
INTERNAL |
MAX1270/1 toc03 |
REFERENCE |
|
EXTERNAL |
REFERENCE |
-15 |
10 |
35 |
60 |
85 |
TEMPERATURE (°C)
FULL POWER-DOWN SUPPLY CURRENT |
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NORMALIZED REFERENCE VOLTAGE |
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CHANNEL-TO-CHANNEL OFFSET-ERROR |
|||||||||||||
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vs. TEMPERATURE |
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vs. TEMPERATURE |
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MATCHINGERROR-OFFSETCHANNEL-TO-CHANNEL(LSB) |
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MATCHING vs. TEMPERATURE |
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150 |
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toc04MAX1270/1 |
VOLTAGEREFERENCENORMALIZED |
1.001 |
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MAX1270/1toc05 |
0.35 |
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BIPOLAR MODE |
MAX1270/1toc06 |
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A)(CURRENTSUPPLYDOWN-POWERFULL |
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130 |
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EXTERNAL |
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1.000 |
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0.30 |
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REFERENCE |
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0.25 |
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110 |
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0.999 |
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0.20 |
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90 |
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0.998 |
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0.15 |
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INTERNAL |
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0.10 |
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UNIPOLAR MODE |
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70 |
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REFERENCE |
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0.997 |
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0.05 |
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50 |
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0.996 |
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0 |
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-40 |
-15 |
10 |
35 |
60 |
85 |
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-40 |
-15 |
10 |
35 |
60 |
85 |
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-40 |
-15 |
10 |
35 |
60 |
85 |
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TEMPERATURE (°C) |
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TEMPERATURE (°C) |
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TEMPERATURE (°C) |
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CHANNEL-TO-CHANNEL GAIN-ERROR |
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INTEGRAL NONLINEARITY vs. |
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MATCHING(LSB) |
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MATCHING vs. TEMPERATURE |
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DIGITAL CODE |
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FTT PLOT |
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0.8 |
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MAX1270/1toc07 |
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0.15 |
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MAX1270/1toc08 |
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0 |
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MAX1270/1toc09 |
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(LSB) |
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fIN = 10kHz |
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0.7 |
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0.10 |
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-20 |
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fSAMPLE = 110ksps |
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0.6 |
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ERROR-GAINCHANNEL-TO |
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UNIPOLAR MODE |
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NONLINEARITYINTEGRAL |
0.05 |
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(dB)AMPLITUDE |
-40 |
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0.5 |
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0 |
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-60 |
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0.4 |
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-0.05 |
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-80 |
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0.3 |
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BIPOLAR MODE |
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- |
0.2 |
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-0.10 |
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-100 |
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CHANNEL |
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0.1 |
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-0.15 |
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-120 |
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-40 |
-15 |
10 |
35 |
60 |
85 |
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0 |
819 |
1638 |
2457 |
3276 |
4095 |
|
0 |
10k |
20k |
30k |
40k |
50k |
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||||||||||||||
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TEMPERATURE (°C) |
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DIGITAL CODE |
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FREQUENCY (Hz) |
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7-174 ___________________________________________________________________________________