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Part: MAX192
Category:
Data Conversion
-> ADC (Analog to Digital Converters)
-> <10 bit
Description: Low-Power, 8-Channel, Serial 10-Bit ADC
Company: Maxim Integrated Products
Datasheet: Download MAX192 datasheet File size : 649 kB
Request For quote: Find where to buy MAX192
Datasheet text preview:
19-0247; Rev. 1; 4/97
Low-Power, 8-Channel, Serial 10-Bit ADC
________________General Description
The MAX192 is a low-cost, 10-bit data-acquisition system that combines an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and ultra-low power consumption. The device operates with a single +5V supply. The analog inputs are software configurable for single-ended and differential (unipolar/bipolar) operation. The 4-wire serial interface connects directly to SPITM, QSPITM, and MicrowireTM devices, without using external logic. A serial strobe output allows direct connection to TMS320 family digital signal processors. The MAX192 u s e s either the internal clock or an external serialinterface clock to perform successive approximation A/D conversions. The serial interface can operate beyond 4MHz when the internal clock is used. The MAX192 has an internal 4.096V reference with a drift of ±30ppm typical. A reference-buffer amplifier simplifies gain trim and two sub-LSBs reduce quantization errors. The MAX192 provides a hardwired SHDN pin and two software-selectable power-down modes. Accessing the serial interface automatically powers up the device, and the quick turn-on time allows the MAX192 to be shut d o w n between conversions. By powering down b e t w e e n conversions, supply current can be cut to under 10µA at reduced sampling rates. The MAX192 is available in 20-pin DIP and SO packages, and in a shrink-small-outline package (SSOP) that occupies 30% less area than an 8-pin DIP. The data format provides hardware and software compatibility with the MAX186/MAX188. For anti-aliasing filters, consult the data sheets for the MAX291MAX297. o 8-Channel Single-Ended or 4-Channel Differential Inputs o Single +5V Operation o Low Power: 1.5mA (operating) 2µA (power-down) o Internal Track/Hold, 133kHz Sampling Rate o Internal 4.096V Reference o 4-Wire Serial Interface is Compatible with SPI, QSPI, Microwire, and TMS320 o 20-Pin DIP, SO, SSOP Packages o Pin-Compatible 12-Bit Upgrade (MAX186/MAX188)
MAX192
_______________Ordering Information
PART MAX192ACPP MAX192BCPP MAX192ACWP MAX192BCWP MAX192ACAP MAX192BCAP MAX192AEPP MAX192BEPP MAX192AEWP MAX192BEWP MAX192AEAP MAX192BEAP MAX192AMJP MAX192BMJP TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -55°C to +125°C -55°C to +125°C PIN-PACKAGE INL (LSB) 20 Plastic DIP 20 Plastic DIP 20 Wide SO 20 Wide SO 20 SSOP 20 SSOP 20 Plastic DIP 20 Plastic DIP 20 Wide SO 20 Wide SO 20 SSOP 20 SSOP 20 CERDIP 20 CERDIP ±1/2 ±1 ±1/2 ±1 ±1/2 ±1 ±1/2 ±1 ±1/2 ±1 ±1/2 ±1 ±1/2 ±1
________________________Applications
Automotive Pen-Entry Systems Consumer Electronics Portable Data Logging Robotics Battery-Powered Instruments, Battery Management Medical Instruments
___________________Pin Configuration
T O P VIEW
CH0 1 CH1 2 CH2 3 CH3 4 CH4 5 CH5 6 CH6 7 2 0 VDD 1 9 SCLK 1 8 CS
MAX192
1 7 DIN 1 6 SSTRB 1 5 DOUT 1 4 DGND 1 3 AGND 1 2 REFADJ 1 1 VREF
____________________________Features
See last page for Typical Operating Circuit.
CH7 8 AGND 9 SHDN 1 0
SPI and QSPI are trademarks of Motorola Corp. Microwire is a trademark of National Semiconductor Corp.
DIP/SO/SSOP
________________________________________________________________ Maxim Integrated Products
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For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
Low-Power, 8-Channel, Serial 10-Bit ADC MAX192
ABSOLUTE MAXIMUM RATINGS
VDD to AGND.. -0.3V to +6V AGND to DGND.... -0.3V to +0.3V CH0CH7 to AGND, DGND .... -0.3V to (VDD + 0.3V) CH0CH7 Total Input Current......... ±20mA VREF to AGND ......... -0.3V to (VDD + 0.3V) REFADJ to AGND..... -0.3V to (VDD + 0.3V) Digital Inputs to DGND...... -0.3V to (VDD + 0.3V) Digital Outputs to DGND ... -0.3V to (VDD + 0.3V) Digital Output Sink Current .......25mA Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 11.11mW/°C above +70°C) ......... 889mW SO (derate 10.00mW/°C above +70°C) .... 800mW SSOP (derate 8.00mW/°C above +70°C) .......... 640mW CERDIP (derate 11.11mW/°C above +70°C) ..... 889mW Operating Temperature Ranges MAX192_C_P ..... 0°C to +70°C MAX192_E_P ........ -40°C to +85°C MAX192_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 = 5V ±5%, fCLK = 2.0MHz, external clock (50% duty cycle), 15 clocks/conversion cycle (133ksps), 4.7µF capacitor at VREF pin, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER DC ACCURACY (Note 1) Resolution Relative Accuracy (Note 2) Differential Nonlinearity Offset Error Gain Error Gain Temperature Coefficient Channel-to-Channel Offset Matching DYNAMIC SPECIFICATIONS (10kHz sine-wave input, 4.096Vp-p, 133ksps, 2.0MHz external clock) Signal-to-Noise + Distortion Ratio Total Harmonic Distortion (up to the 5th harmonic) Spurious-Free Dynamic Range Channel-to-Channel Crosstalk Small-Signal Bandwidth Full-Power Bandwidth CONVERSION RATE Conversion Time (Note 4) Track/Hold Acquisition Time Aperture Delay Aperture Jitter Internal Clock Frequency tCONV tAZ 10 <50 1.7 Internal clock External clock, 2MHz, 12 clocks/conversion 5.5 6 1.5 10 µs µs ns ps MHz SINAD THD SFDR 65kHz, VIN = 4.096Vp-p (Note 3) -3dB rolloff 66 -70 70 -75 4.5 800 dB dB dB dB MHz kHz External reference, 4.096V External reference, 4.096V ±0.8 ±0.1 DNL MAX192A MAX192B No missing codes over temperature 10 ±1/2 ±1 ±1 ±2 ±2 Bits LSB LSB LSB LSB ppm/°C LSB SYMBOL CONDITIONS MIN TYP MAX UNITS
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Low-Power, 8-Channel, Serial 10-Bit ADC
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 5V ±5%, fCLK = 2.0MHz, external clock (50% duty cycle), 15 clocks/conversion cycle (133ksps), 4.7µF capacitor at VREF pin, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER External Clock Frequency ANALOG INPUT Common-mode range (any input) Single-ended range (unipolar only) Analog Input Voltage (Note 6) Differential range Multiplexer Leakage Current Input Capacitance VREF Output Voltage VREF Short-Circuit Current VREF Tempco Load Regulation (Note 8) Capacitive Bypass at VREF Capacitive Bypass at REFADJ REFADJ Adjustment Range EXTERNAL REFERENCE AT VREF (buffer disabled, VREF = 4.096V) Input Voltage Range Input Current Input Resistance Shutdown VREF Input Current Buffer Disable Threshold REFADJ EXTERNAL REFERENCE AT REFADJ Capacitive Bypass at VREF Reference-Buffer Gain REFADJ Input Current Internal compensation mode External compensation mode 0 4.7 1.678 ±50 µF V/V µA VDD 50mV 12 2.5 200 20 1.5 10 VDD + 50mV 350 V µA k µA V 0mA to 0.5mA output load Internal compensation External compensation Internal compensation External compensation 0 4.7 0.01 0.01 ±1.5 ±30 2.5 Unipolar Bipolar 0 0 0 -VREF -2 ±0.01 16 4.066 4.096 4.126 30 VDD VREF VREF +VREF 2 ±1 µA pF V mA ppm/°C mV µF µF % V SYMBOL CONDITIONS External compensation, 4.7µF Internal compensation (Note 5) Used for data transfer only MIN 0.1 0.1 10 TYP MAX 2.0 0.4 MHz UNITS
MAX192
On/off leakage current; VIN = 0V, 5V (Note 5) TA = +25°C (Note 7)
INTERNAL REFERENCE (reference buffer enabled)
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