|Category||Data Conversion => ADC (Analog to Digital Converters) => <10 bit => 8 bit|
|Description||+2.7V To +5.25V Low-Power 8-Channel Serial 10-Bit ADCs
The MAX148/MAX149 10-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. They operate from a single +2.7V to +5.25V supply, and sample to 133ksps. Both devices\' analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.
The 4-wire serial interface connects directly to SPI™/QSPI™ and MICROWIRE™ devices without external logic. A serial-strobe output allows direct connection to TMS320-family digital signal processors. The MAX148/MAX149 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.
|Company||Maxim Integrated Products|
|Datasheet||Download MAX148 datasheet
|Cross ref.||Similar parts: ADC1038, LTC1090, LTC1093, LTC1094, LTC1283, MC145050, MC145051, MC145053, TLC1542, TLC1543|
The MAX148/MAX149 10-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. They operate from a single to +5.25V supply, and sample to 133ksps. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation. The 4-wire serial interface connects directly to SPIK/ QSPIK and MICROWIREK devices without external logic. A serial-strobe output allows direct connection to TMS320-family digital signal processors. The MAX148/ MAX149 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions. The MAX149 has an internal 2.5V reference, while the MAX148 requires an external reference. Both parts have a reference-buffer amplifier with a Q1.5% voltageadjustment range. These devices provide a hard-wired SHDN pin and a software-selectable power-down, and can be programmed to automatically shut down at the end of a conversion. Accessing the serial interface automatically powers up the MAX148/MAX149, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60FA at reduced sampling rates. The MAX148/MAX149 are available a 20-pin DIP and a 20-pin SSOP. For 4-channel versions of these devices, see the MAX1248/MAX1249 data sheet. Inputs
S Single-Supply Operation: +5.25V S Internal 2.5V Reference (MAX149) S Low Power: (133ksps, 3V Supply)Features
S Software-Configurable Unipolar or Bipolar Inputs S 20-Pin DIP/SSOP Packages
PART MAX148ACAP MAX148BCAP TEMP RANGE to +70°C PINPACKAGE 20 Plastic DIP 20 Plastic DIP 20 SSOP 20 SSOP INL (LSB)
Ordering Information continued at end of data sheet. Contact factory for availability of alternate surface-mount package. Specify lead-free by placing + by the part number when ordering.
*Contact factory for availability of CERDIP package, and for processing to MIL-STD-883B. Not available in lead-free.Applications
Portable Data Logging Data Acquisition Medical Instruments Battery-Powered Instruments Pen Digitizers Process ControlAGND COM CS SCLK DIN DOUT SSTRB SHDN CPU I/O SCK (SK) MOSI (SO) MISO (SI) VSS
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
For pricing, delivery, and ordering information, please contact Maxim Direct 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
VDD to AGND, to +6V AGND +0.3V CH0CH7, COM to AGND, DGND........... -0.3V to (VDD + 0.3V) VREF, REFADJ AGND...........................-0.3V to (VDD + 0.3V) Digital Inputs to +6V Digital Outputs to DGND.......................... -0.3V to (VDD + 0.3V) Digital Output Sink Current.................................................25mA Continuous Power Dissipation (TA = +70NC) Plastic DIP (derate 11.11mW/NC above +70NC)...........889mW SSOP (derate 8.00mW/NC above +70NC).....................640mW CERDIP (derate 11.11mW/NC above +70NC)...............889mW Operating Temperature Ranges to +125NC Storage Temperature Range............................ to +150NC Lead Temperature (soldering, 10s).................................+300NC
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.
(VDD to +5.25V; COM = 0; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); MAX149--4.7FF capacitor at VREF pin; MAX148--external reference, VREF = 2.500V applied to VREF pin; TA = TMIN to TMAX, unless otherwise noted.) PARAMETER DC ACCURACY (Note 1) Resolution Relative Accuracy (Note 2) Differential Nonlinearity Offset Error Gain Error (Note 3) Gain Temperature Coefficient Channel-to-Channel Offset Matching Signal-to-Noise + Distortion Noise Total Harmonic Distortion Spurious-Free Dynamic Range Channel-to-Channel Crosstalk Small-Signal Bandwidth Full-Power Bandwidth CONVERSION RATE Internal clock, SHDN = unconnected Conversion Time (Note 5) tCONV Internal clock, SHDN = VDD External clock 2MHz, 12 clocks/ conversion 65 s INL DNL MAX14_B No missing codes over temperature MAX14_A MAX14_B Bits LSB ppm/°C LSB SYMBOL CONDITIONS MIN TYP MAX UNITS
DYNAMIC SPECIFICATIONS (10kHz Sine-Wave Input, 133ksps, 2.0MHz External Clock, Bipolar Input Mode) SINAD THD SFDR 65kHz, 2.500VP-P (Note 4) -3dB rolloff Up to the 5th harmonic dB MHzTrack/Hold Acquisition Time Aperture Delay Aperture Jitter
(VDD to +5.25V; COM = 0; fSCLK = 2.0MHz; external clock (50% duty cycle); 15 clocks/conversion cycle (133ksps); MAX149--4.7FF capacitor at VREF pin; MAX148--external reference, VREF = 2.500V applied to VREF pin; TA = TMIN to TMAX, unless otherwise noted.) PARAMETER CONVERSION RATE (continued) Internal Clock Frequency External Clock Frequency ANALOG/COM INPUTS Input Voltage Range, SingleEnded and Differential (Note 6) Multiplexer Leakage Current Input Capacitance INTERNAL REFERENCE (MAX149 Only, Reference Buffer Enabled) VREF Output Voltage VREF Short-Circuit Current VREF Temperature Coefficient Load Regulation (Note 8) Capacitive Bypass at VREF Capacitive Bypass at REFADJ Adjustment Range EXTERNAL REFERENCE AT VREF (Buffer Disabled) VREF Input Voltage Range (Note 9) VREF Input Current VREF Input Resistance Shutdown VREF Input Current REFADJ Buffer-Disable Threshold EXTERNAL REFERENCE AT REFADJ Capacitive Bypass at VREF Reference Buffer Gain REFADJ Input Current Internal compensation mode External compensation mode MAX148 µF V/V µA VDD 0.5 VREF = 2.500V VDD to 0.2mA output load Internal compensation mode External compensation mode = +25°C (Note V mA ppm/°C F % Unipolar, COM = 0 Bipolar, COM = VREF/2 On/off leakage current, VCH_ 0 or VDD 0 to VREF A pF SHDN = unconnected SHDN = VDD 0.1 Data transfer only MHz SYMBOL CONDITIONS MIN TYP MAX UNITS
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