KIT |
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EVALUATION |
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AVAILABLE |
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Channel, |
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Serial 12-Bit ADCs |
Description
-acquisition systems high-bandwidth with high conversion
. The MAX146 oper-
.6V supply; the MAX147 to +5.25V supply. Both configurable for
operation.
directly to SPI™/ without external logic. A connection to TMS320-
. The MAX146/MAX147 external serial-interface analog-to-
.5V reference, while the
. Both parts have with a ±1.5% voltage-
-wired SHDN pin and a and can be prodown at the end of a coninterface automatically
powers up the MAX146/MAX147, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60µA at reduced sampling rates.
The MAX146/MAX147 are available in 20-pin DIP and SSOP packages.
For 4-channel versions of these devices, see the MAX1246/MAX1247 data sheet.
________________________Applications
Portable Data Logging |
Data Acquisition |
Medical Instruments |
Battery-Powered Instruments |
Pen Digitizers |
Process Control |
Pin Configuration appears at end of data sheet.
SPI and QSPI are registered trademarks of Motorola, Inc.
Microwire is a registered trademark of National Semiconductor Corp.
____________________________Features
♦8-Channel Single-Ended or 4-Channel Differential Inputs
♦Single-Supply Operation:
+2.7V to +3.6V (MAX146)
+2.7V to +5.25V (MAX147)
♦Internal 2.5V Reference (MAX146)
♦Low Power: 1.2mA (133ksps, 3V supply)
54µA (1ksps, 3V supply) 1µA (power-down mode)
♦SPI/QSPI/Microwire/TMS320-Compatible 4-Wire Serial Interface
♦Software-Configurable Unipolar or Bipolar Inputs
♦20-Pin DIP/SSOP Packages
______________Ordering Information
PART† |
TEMP. RANGE |
PIN-PACKAGE |
INL |
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(LSB) |
MAX146ACPP |
0°C to +70°C |
20 Plastic DIP |
±1/2 |
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MAX146BCPP |
0°C to +70°C |
20 Plastic DIP |
±1 |
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MAX146ACAP |
0°C to +70°C |
20 SSOP |
±1/2 |
MAX146BCAP |
0°C to +70°C |
20 SSOP |
±1 |
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MAX146BC/D |
0°C to +70°C |
Dice* |
±1 |
Ordering Information continued at end of data sheet.
†Contact factory for availability of alternate surface-mount packages.
*Dice are specified at TA = +25°C, DC parameters only.
__________Typical Operating Circuit
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+3V |
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CH0 |
VDD |
VDD |
0V TO |
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DGND |
0.1μF |
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+2.5V |
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ANALOG |
MAX146 AGND |
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INPUTS |
CPU |
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CH7 |
COM |
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4.7μF |
VREF |
CS |
I/O |
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SCLK |
SCK (SK) |
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DIN |
MOSI (SO) |
0.047μF |
REFADJ |
DOUT |
MISO (SI) |
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SSTRB |
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VSS |
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SHDN |
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________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX146/MAX147
MAX146/MAX147
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
ABSOLUTE MAXIMUM RATINGS
VDD to AGND, DGND................................................. |
|
- 0.3V to 6V |
AGND to DGND ...................................................... |
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- 0.3V to 0.3V |
CH0–CH7, COM to AGND, DGND ............ |
-0.3V to (VDD + 0.3V) |
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VREF, REFADJ to AGND ........................... |
-0.3V to (VDD + 0.3V) |
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Digital Inputs to DGND .............................................. |
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- 0.3V to 6V |
Digital Outputs to DGND ........................... |
-0.3V to (VDD + 0.3V) |
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Digital Output Sink Current ................................................. |
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25mA |
Continuous Power Dissipation (TA = +70°C) |
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Plastic DIP (derate 11.11mW/°C above +70°C) |
......... 889mW |
SSOP (derate 8.00mW/°C above +70°C) ................... |
640mW |
CERDIP (derate 11.11mW/°C above +70°C).............. |
889mW |
Operating Temperature Ranges |
|
MAX146_C_P/MAX147_C_P .............................. |
0°C to +70°C |
MAX146_E_P/MAX147_E_P............................ |
-40°C to +85°C |
MAX146_MJP/MAX147_MJP ........................ |
-55°C to +125°C |
Storage Temperature Range ............................ |
-60°C to +150°C |
Lead Temperature (soldering, 10sec) ............................ |
+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 = +2.7V to +3.6V (MAX146); VDD = +2.7V to +5.25V (MAX147); COM = 0V; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); MAX146—4.7µF capacitor at VREF pin; MAX147—external reference, VREF = 2.500V applied to VREF pin; TA = TMIN to TMAX; unless otherwise noted.)
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PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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DC ACCURACY (Note 1) |
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Resolution |
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12 |
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Bits |
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Relative Accuracy (Note 2) |
INL |
MAX14_A |
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±0.5 |
LSB |
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MAX14_B |
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±1.0 |
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Differential Nonlinearity |
DNL |
No missing codes over temperature |
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±1 |
LSB |
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Offset Error |
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MAX14_A |
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±0.5 |
±3 |
LSB |
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MAX14_B |
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±0.5 |
±4 |
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Gain Error (Note 3) |
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±0.5 |
±4 |
LSB |
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Gain Temperature Coefficient |
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±0.25 |
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ppm/°C |
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Channel-to-Channel Offset |
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±0.25 |
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LSB |
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Matching |
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DYNAMIC SPECIFICATIONS (10kHz sine-wave input, 0V to 2.500Vp-p, 133ksps, 2.0MHz external clock, bipolar input mode)
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Signal-to-Noise + Distortion Ratio |
SINAD |
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70 |
73 |
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dB |
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Total Harmonic Distortion |
THD |
Up to the 5th harmonic |
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-88 |
-80 |
dB |
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Spurious-Free Dynamic Range |
SFDR |
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80 |
90 |
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dB |
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Channel-to-Channel Crosstalk |
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65kHz, 2.500Vp-p (Note 4) |
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-85 |
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dB |
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Small-Signal Bandwidth |
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-3dB rolloff |
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2.25 |
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MHz |
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Full-Power Bandwidth |
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1.0 |
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MHz |
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CONVERSION RATE |
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Internal clock, SHDN = FLOAT |
5.5 |
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7.5 |
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Conversion Time (Note 5) |
tCONV |
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µs |
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Internal clock, SHDN = VDD |
35 |
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65 |
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External clock = 2MHz, 12 clocks/conversion |
6 |
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Track/Hold Acquisition Time |
tACQ |
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1.5 |
µs |
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Aperture Delay |
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30 |
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ns |
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Aperture Jitter |
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<50 |
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ps |
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Internal Clock Frequency |
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SHDN = FLOAT |
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1.8 |
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MHz |
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SHDN = VDD |
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0.225 |
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External Clock Frequency |
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0.1 |
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2.0 |
MHz |
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Data transfer only |
0 |
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2.0 |
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2 _______________________________________________________________________________________
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +3.6V (MAX146); VDD = +2.7V to +5.25V (MAX147); COM = 0V; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); MAX146—4.7µF capacitor at VREF pin; MAX147—external reference, VREF = 2.500V applied to VREF pin; TA = TMIN to TMAX; unless otherwise noted.)
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PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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ANALOG/COM INPUTS |
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Input Voltage Range, Single- |
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Unipolar, COM = 0V |
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0 to VREF |
V |
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Ended and Differential (Note 6) |
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Bipolar, COM = VREF / 2 |
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±VREF / 2 |
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Multiplexer Leakage Current |
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On/off leakage current, VCH_ = 0V or VDD |
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±0.01 |
±1 |
µA |
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Input Capacitance |
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16 |
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pF |
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INTERNAL REFERENCE (MAX146 only, reference buffer enabled)
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VREF Output Voltage |
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TA = +25°C |
2.480 |
2.500 |
2.520 |
V |
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VREF Short-Circuit Current |
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30 |
mA |
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MAX146_C |
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±30 |
±50 |
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VREF Temperature Coefficient |
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MAX146_E |
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±30 |
±60 |
ppm/°C |
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MAX146_M |
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±30 |
±80 |
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Load Regulation (Note 7) |
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0mA to 0.2mA output load |
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0.35 |
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mV |
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Capacitive Bypass at VREF |
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Internal compensation mode |
0 |
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µF |
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External compensation mode |
4.7 |
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Capacitive Bypass at REFADJ |
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0.047 |
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µF |
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REFADJ Adjustment Range |
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±1.5 |
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% |
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EXTERNAL REFERENCE AT VREF (Buffer |
disabled) |
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VREF Input Voltage Range |
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1.0 |
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VDD + |
V |
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(Note 8) |
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50mV |
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VREF Input Current |
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VREF = 2.500V |
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100 |
150 |
µA |
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VREF Input Resistance |
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18 |
25 |
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kΩ |
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Shutdown VREF Input Current |
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0.01 |
10 |
µA |
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REFADJ Buffer Disable Threshold |
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VDD - |
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V |
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0.5 |
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EXTERNAL REFERENCE AT REFADJ |
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Capacitive Bypass at VREF |
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Internal compensation mode |
0 |
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µF |
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External compensation mode |
4.7 |
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Reference Buffer Gain |
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MAX146 |
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2.06 |
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V/V |
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MAX147 |
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2.00 |
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REFADJ Input Current |
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MAX146 |
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±50 |
µA |
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MAX147 |
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±10 |
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MAX146/MAX147
_______________________________________________________________________________________ 3
MAX146/MAX147
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +3.6V (MAX146); VDD = +2.7V to +5.25V (MAX147); COM = 0V; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); MAX146—4.7µF capacitor at VREF pin; MAX147—external reference, VREF = 2.500V applied to VREF pin; TA = TMIN to TMAX; unless otherwise noted.)
PARAMETER |
SYMBOL |
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CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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DIGITAL INPUTS (DIN, SCLK, |
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CS, |
SHDN) |
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DIN, SCLK, CS Input High Voltage |
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VIH |
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VDD ≤ 3.6V |
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2.0 |
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V |
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VDD > 3.6V, MAX147 only |
3.0 |
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DIN, SCLK, CS Input Low Voltage |
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VIL |
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0.8 |
V |
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DIN, SCLK, CS Input Hysteresis |
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VHYST |
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0.2 |
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V |
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DIN, SCLK, CS Input Leakage |
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IIN |
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VIN = 0V or VDD |
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±0.01 |
±1 |
µA |
|||||
DIN, SCLK, CS Input Capacitance |
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CIN |
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(Note 9) |
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15 |
pF |
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SHDN Input High Voltage |
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VSH |
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VDD - 0.4 |
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V |
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SHDN Input Mid Voltage |
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VSM |
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1.1 |
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VDD - 1.1 |
V |
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SHDN Input Low Voltage |
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VSL |
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0.4 |
V |
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SHDN Input Current |
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IS |
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= 0V or VDD |
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±4.0 |
µA |
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SHDN |
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SHDN Voltage, Floating |
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VFLT |
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SHDN |
= FLOAT |
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VDD / 2 |
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V |
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SHDN Maximum Allowed |
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SHDN = FLOAT |
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±100 |
nA |
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Leakage, Mid Input |
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DIGITAL OUTPUTS (DOUT, SSTRB) |
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Output Voltage Low |
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VOL |
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ISINK = 5mA |
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0.4 |
V |
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ISINK = 16mA |
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0.8 |
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Output Voltage High |
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VOH |
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ISOURCE = 0.5mA |
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VDD - 0.5 |
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V |
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Three-State Leakage Current |
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IL |
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CS = VDD |
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±0.01 |
±10 |
µA |
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Three-State Output Capacitance |
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COUT |
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CS = VDD (Note 9) |
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15 |
pF |
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POWER REQUIREMENTS |
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Positive Supply Voltage |
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VDD |
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MAX146 |
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2.70 |
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3.60 |
V |
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MAX147 |
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2.70 |
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5.25 |
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Operating mode, full-scale input |
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1.2 |
2.0 |
mA |
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Positive Supply Current, MAX146 |
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IDD |
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VDD = 3.6V |
Fast power-down |
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30 |
70 |
µA |
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Full power-down |
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1.2 |
10 |
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Positive Supply Current, MAX147 |
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IDD |
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Operating mode, |
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VDD = 5.25V |
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1.8 |
2.5 |
mA |
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full-scale input |
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VDD = 3.6V |
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0.9 |
1.5 |
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VDD = 5.25V |
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2.1 |
15 |
µA |
Positive Supply Current, MAX147 |
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IDD |
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Full power-down |
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µA |
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VDD = 3.6V |
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1.2 |
10 |
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Supply Rejection (Note 10) |
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PSR |
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Full-scale input, external reference = 2.500V, |
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±0.3 |
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mV |
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VDD = 2.7V to VDD(MAX) |
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4 _______________________________________________________________________________________
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
TIMING CHARACTERISTICS
(VDD = +2.7V to +3.6V (MAX146); VDD = +2.7V to +5.25V (MAX147); TA = TMIN to TMAX; unless otherwise noted.)
PARAMETER |
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SYMBOL |
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CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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Acquisition Time |
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tACQ |
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1.5 |
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µs |
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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 |
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tDH |
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0 |
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ns |
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SCLK Fall to Output Data Valid |
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tDO |
Figure 1 |
MAX14_ _C/E |
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20 |
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200 |
ns |
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MAX14Figure 1 _M |
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20 |
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240 |
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CS Fall to Output Enable |
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tDV |
Figure 1 |
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240 |
ns |
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CS Rise to Output Disable |
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tTR |
Figure 2 |
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240 |
ns |
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CS to SCLK Rise Setup |
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tCSS |
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100 |
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ns |
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CS to SCLK Rise Hold |
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tCSH |
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0 |
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ns |
SCLK Pulse Width High |
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tCH |
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200 |
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ns |
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SCLK Pulse Width Low |
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tCL |
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200 |
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ns |
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SCLK Fall to SSTRB |
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tSSTRB |
Figure 1 |
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240 |
ns |
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CS Fall to SSTRB Output Enable |
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tSDV |
External clock mode only, Figure 1 |
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240 |
ns |
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CS Rise to SSTRB Output Disable |
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tSTR |
External clock mode only, Figure 2 |
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240 |
ns |
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SSTRB Rise to SCLK Rise |
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tSCK |
Internal clock mode only (Note 9) |
0 |
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ns |
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Note 1: Tested at VDD = 2.7V; COM = 0V; unipolar single-ended input mode.
Note 2: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has been calibrated.
Note 3: MAX146—internal reference, offset nulled; MAX147—external reference (VREF = +2.500V), offset nulled. Note 4: Ground “on” channel; sine wave applied to all “off” channels.
Note 5: Conversion time defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle. Note 6: The common-mode range for the analog inputs is from AGND to VDD.
Note 7: External load should not change during conversion for specified accuracy. Note 8: ADC performance is limited by the converter’s noise floor, typically 300µVp-p. Note 9: Guaranteed by design. Not subject to production testing.
Note 10: Measured as |VFS(2.7V) - VFS(VDD, MAX)|.
__________________________________________Typical Operating Characteristics
(VDD = 3.0V, VREF = 2.500V, fSCLK = 2.0MHz, CLOAD = 20pF, TA = +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY |
INTEGRAL NONLINEARITY |
INTEGRAL NONLINEARITY |
vs. CODE |
vs. SUPPLY VOLTAGE |
vs. TEMPERATURE |
|
0.5 |
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MAX146/47-01 |
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0.50 |
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MAX146/47-02 |
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0.50 |
VDD = 2.7V |
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MAX146/47-03 |
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0.4 |
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0.45 |
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0.45 |
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0.3 |
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0.40 |
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MAX146 |
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0.40 |
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0.2 |
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0.35 |
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0.35 |
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(LSB) |
0.1 |
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(LSB) |
0.30 |
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(LSB) |
0.30 |
MAX146 |
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0 |
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0.25 |
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0.25 |
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INL |
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INL |
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INL |
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-0.1 |
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0.20 |
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0.20 |
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MAX147 |
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MAX147 |
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-0.2 |
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0.15 |
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0.15 |
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-0.3 |
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0.10 |
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0.10 |
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-0.4 |
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0.05 |
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0.05 |
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-0.5 |
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0 |
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0 |
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0 |
1024 |
2048 |
3072 |
4096 |
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2.25 |
2.75 |
3.25 |
3.75 |
4.25 |
4.75 |
5.25 |
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-60 |
-20 |
20 |
60 |
100 |
140 |
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CODE |
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VDD (V) |
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TEMPERATURE (°C) |
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_______________________________________________________________________________________ |
5 |
MAX146/MAX147
MAX146/MAX147
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
____________________________Typical Operating Characteristics (continued)
(VDD = 3.0V, VREF = 2.500V, fSCLK = 2.0MHz, CLOAD = 20pF, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT |
SHUTDOWN SUPPLY CURRENT |
MAX146 |
|
INTERNAL REFERENCE VOLTAGE |
|||
vs. SUPPLY VOLTAGE |
vs. SUPPLY VOLTAGE |
||
vs. SUPPLY VOLTAGE |
|||
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2.00 |
RL = ∞ |
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MAX146/47-04 |
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3.5 |
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|
FULL POWER-DOWN |
MAX146/47-05 |
2.5020 |
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MAX146/47-06 |
|||
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CLOAD = 50pF |
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|||||||||
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1.75 |
CODE = 101010100000 |
(μA) |
3.0 |
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2.5015 |
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SUPPLY CURRENT (mA) |
1.50 |
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SHUTDOWNSUPPLY CURRENT |
2.5 |
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2.5010 |
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MAX146 |
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2.0 |
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1.25 |
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1.5 |
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2.5005 |
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1.00 |
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CLOAD = 20pF |
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1.0 |
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2.5000 |
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VREF(V) |
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0.75 |
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0.5 |
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MAX147 |
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2.4995 |
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0.50 |
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0 |
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2.4990 |
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2.25 |
2.75 |
3.25 |
3.75 |
4.25 |
4.75 |
5.25 |
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2.25 |
2.75 |
3.25 |
3.75 |
4.25 |
4.75 |
5.25 |
2.25 |
2.75 |
3.25 |
3.75 |
4.25 |
4.75 |
5.25 |
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SUPPLY VOLTAGE (V) |
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VDD (V) |
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VDD (V) |
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SHUTDOWN CURRENT |
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MAX146 |
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SUPPLY CURRENT vs. TEMPERATURE |
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INTERNAL REFERENCE VOLTAGE |
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2.0 |
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vs. TEMPERATURE |
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vs. TEMPERATURE |
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1.3 |
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MAX146/47-07 |
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MAX1247-08 |
2.501 |
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MAX146/47-09 |
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2.500 |
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MAX146 |
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1.2 |
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CURRENTSHUTDOWN(μA) |
1.6 |
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VDD = 3.6V |
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CURRENTSUPPLY(mA) |
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(V)VREF |
2.499 |
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MAX147 |
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1.2 |
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2.496 |
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VDD = 2.7V |
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1.1 |
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2.498 |
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1.0 |
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0.8 |
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2.497 |
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0.9 |
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0.4 |
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2.495 |
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RLOAD = ∞ |
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0.8 |
CODE = 101010100000 |
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0 |
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2.494 |
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||||||||
-60 |
-20 |
20 |
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60 |
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100 |
140 |
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-60 |
-20 |
20 |
60 |
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100 |
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140 |
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-60 |
-20 |
20 |
60 |
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100 |
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140 |
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TEMPERATURE (°C) |
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TEMPERATURE (°C) |
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TEMPERATURE (°C) |
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EFFECTIVE NUMBER OF BITS |
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FFT PLOT |
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vs. FREQUENCY |
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20 |
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MAX146/47-10 |
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12.0 |
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MAX146/47-11 |
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fIN |
= 10kHz |
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0 |
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VDD = 2.7V |
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VDD = 2.7V |
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(dB) |
-20 |
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fSAMPLE = 133kHz |
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11.8 |
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11.6 |
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-40 |
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AMPLITUDE |
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ENOB |
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-60 |
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11.4 |
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-80 |
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11.2 |
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-100 |
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11.0 |
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-120 |
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1 |
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10 |
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100 |
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0 |
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10 |
20 |
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30 |
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40 |
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50 |
60 |
70 |
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FREQUENCY (kHz) |
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FREQUENCY (kHz) |
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6 _______________________________________________________________________________________
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
____________________________Typical Operating Characteristics (continued)
(VDD = 3.0V, VREF = 2.500V, fSCLK = 2.0MHz, CLOAD = 20pF, TA = +25°C, unless otherwise noted.)
|
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GAIN ERROR |
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CHANNEL-TO-CHANNEL GAIN MATCHING |
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OFFSET vs. SUPPLY VOLTAGE |
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vs. SUPPLY VOLTAGE |
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vs. SUPPLY VOLTAGE |
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0.50 |
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MAX146/47-12 |
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0.50 |
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MAX146/47-13 |
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0.50 |
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MAX146/47-14 |
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0.45 |
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0.45 |
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0.45 |
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(LSB)OFFSET |
0.40 |
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(LSB)ERRORGAIN |
0.40 |
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(LSB)MATCHINGGAIN |
0.40 |
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0.35 |
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0.35 |
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0.35 |
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0.30 |
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0.30 |
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0.30 |
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0.25 |
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0.25 |
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0.25 |
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0.20 |
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0.20 |
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0.20 |
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0.15 |
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0.15 |
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0.15 |
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0.10 |
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0.10 |
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0.10 |
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0.05 |
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0.05 |
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0.05 |
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0 |
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0 |
2.75 |
3.25 |
3.75 |
4.25 |
4.75 |
5.25 |
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0 |
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2.25 |
2.75 |
3.25 |
3.75 |
4.25 |
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4.75 |
5.25 |
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2.25 |
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2.25 |
2.75 |
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3.25 |
3.75 |
4.25 |
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4.75 |
5.25 |
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VDD (V) |
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VDD (V) |
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VDD (V) |
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GAIN ERROR |
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CHANNEL-TO-CHANNEL GAIN MATCHING |
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OFFSET vs. TEMPERATURE |
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vs. TEMPERATURE |
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vs. TEMPERATURE |
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0.50 |
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MAX146/47-15 |
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0.50 |
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MAX146/47-16 |
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0.50 |
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MAX146/47-17 |
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0.45 |
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0.45 |
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0.45 |
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(LSB)OFFSET |
0.40 |
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(LSB)ERRORGAIN |
0.40 |
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(LSB)MATCHINGGAIN |
0.40 |
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0.35 |
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0.35 |
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0.35 |
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0.30 |
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0.30 |
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0.30 |
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0.25 |
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0.25 |
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0.25 |
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0.20 |
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0.20 |
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0.20 |
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0.15 |
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0.15 |
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0.15 |
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0.10 |
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0.10 |
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0.10 |
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0.05 |
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0.05 |
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0.05 |
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0 |
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0 |
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0 |
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-55 |
-30 |
-5 |
20 |
45 |
70 |
95 |
120 |
145 |
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-55 |
-30 |
-5 20 45 70 95 |
120 145 |
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-55 |
-30 |
-5 |
20 |
45 |
70 |
95 |
120 |
145 |
|||
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|
|
TEMPERATURE (˚C) |
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TEMPERATURE (˚C) |
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TEMPERATURE (˚C) |
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|||||||
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CHANNEL-TO-CHANNEL OFFSET MATCHING |
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CHANNEL-TO-CHANNEL OFFSET MATCHING |
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||||||||||||||||
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vs. SUPPLY VOLTAGE |
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vs. TEMPERATURE |
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|||||||
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0.50 |
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MAX146/47-18 |
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0.50 |
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MAX146/47-19 |
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0.45 |
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0.45 |
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(LSB) |
0.40 |
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(LSB) |
0.40 |
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0.35 |
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0.35 |
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MATCHING |
0.30 |
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MATCHING |
0.30 |
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0.25 |
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0.25 |
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OFFSET |
0.20 |
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OFFSET |
0.20 |
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0.15 |
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0.15 |
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0.10 |
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0.10 |
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0.05 |
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0.05 |
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0 |
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2.75 |
3.25 |
3.75 |
4.25 |
4.75 |
5.25 |
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0 |
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2.25 |
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-55 |
-30 |
-5 |
20 |
45 |
70 |
95 |
120 |
145 |
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VDD (V) |
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TEMPERATURE (˚C) |
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|
MAX146/MAX147
_______________________________________________________________________________________ 7
MAX146/MAX147
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
______________________________________________________________Pin Description
PIN |
NAME |
FUNCTION |
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|
1–8 |
CH0–CH7 |
Sampling Analog Inputs |
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|
9 |
COM |
Ground reference for analog inputs. COM sets zero-code voltage in single-ended mode. Must be |
|
stable to ±0.5LSB. |
|||
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||
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|
Three-Level Shutdown Input. Pulling SHDN low shuts the MAX146/MAX147 down; otherwise, they are |
|
10 |
SHDN |
fully operational. Pulling SHDN high puts the reference-buffer amplifier in internal compensation mode. |
|
|
|
Letting SHDN float puts the reference-buffer amplifier in external compensation mode. |
|
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|
Reference-Buffer Output/ADC Reference Input. Reference voltage for analog-to-digital conversion. |
|
11 |
VREF |
In internal reference mode (MAX146 only), the reference buffer provides a 2.500V nominal output, |
|
externally adjustable at REFADJ. In external reference mode, disable the internal buffer by pulling |
|||
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||
|
|
REFADJ to VDD. |
|
12 |
REFADJ |
Input to the Reference-Buffer Amplifier. To disable the reference-buffer amplifier, tie REFADJ to VDD. |
|
13 |
AGND |
Analog Ground |
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|
14 |
DGND |
Digital Ground |
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|
15 |
DOUT |
Serial Data Output. Data is clocked out at SCLK’s falling edge. High impedance when CS is high. |
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|
Serial Strobe Output. In internal clock mode, SSTRB goes low when the MAX146/MAX147 begin the |
|
16 |
SSTRB |
A/D conversion, and goes high when the conversion is finished. In external clock mode, SSTRB pulses |
|
high for one clock period before the MSB decision. High impedance when CS is high (external clock |
|||
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||
|
|
mode). |
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|
17 |
DIN |
Serial Data Input. Data is clocked in at SCLK’s rising edge. |
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|
18 |
CS |
Active-Low Chip Select. Data will not be clocked into DIN unless CS is low. When CS is high, DOUT is |
|
high impedance. |
|||
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||
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|
19 |
SCLK |
Serial Clock Input. Clocks data in and out of serial interface. In external clock mode, SCLK also sets |
|
the conversion speed. (Duty cycle must be 40% to 60%.) |
|||
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|
20 |
VDD |
Positive Supply Voltage |
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|
VDD |
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|
VDD |
|||||||||||||
DOUT |
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DOUT |
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|
6k |
|
DOUT |
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DOUT |
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|
6k |
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CLOAD |
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CLOAD |
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CLOAD |
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CLOAD |
||||
|
6k |
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6k |
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|||||||||||||||||||||||||
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||||||||||||||||||||||||||
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50pF |
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50pF |
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50pF |
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50pF |
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DGND |
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DGND |
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DGND |
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a) High-Z to VOH and VOL to VOH |
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b) High-Z to VOL and VOH to VOL |
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a) VOH to High-Z |
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b) VOL to High-Z |
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Figure 1. Load Circuits for Enable Time Figure 2. Load Circuits for Disable Time
8 _______________________________________________________________________________________