MAX191 12 bit 1 channel - 19-4506; Rev 4; 2/97 NUAL KIT MA...

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General Description The MAX191 is a monolithic, CMOS, 12-bit analog-to- digital converter (ADC) featuring differential inputs, track/hold (T/H), internal voltage reference, internal or external clock, and parallel or serial μP interface. The MAX191 has a 7.5μs conversion time, a 2μs acquisition time, and a guaranteed 100ksps sample rate. The MAX191 operates from a single +5V supply or from dual ±5V supplies, allowing ground-referenced bipolar input signals. The device features a logic power-down input, which reduces the 3mA V DD supply current to 50μA max, including the internal-reference current. Decoupling capacitors are the only external compo- nents needed for the power supply and reference. This ADC operates with either an external reference, or an internal reference that features an adjustment input for trimming system gain errors. The MAX191 provides three interface modes: two 8-bit parallel modes, and a serial interface mode that is com- patible with SPI TM , QSPI TM , and MICROWIRE TM serial- interface standards. ________________________Applications Battery-Powered Data Logging PC Pen Digitizers High-Accuracy Process Control Electromechanical Systems Data-Acquisition Boards for PCs Automatic Testing Systems Telecommunications Digital Signal Processing (DSP) ____________________________Features 12-Bit Resolution, 1/2LSB Linearity +5V or ±5V Operation Built-In Track/Hold Internal Reference with Adjustment Capability Low Power: 3mA Operating Mode 20μA Power-Down Mode 100ksps Tested Sampling Rate Serial and 8-Bit Parallel μP Interface 24-Pin Narrow DIP and Wide SO Packages MAX191 Low-Power, 12-Bit Sampling ADC with Internal Reference and Power-Down ________________________________________________________________ Maxim Integrated Products 1 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 V DD CLK/SCLK PAR HBEN AIN- AIN+ V SS PD TOP VIEW CS RD D7/DOUT D6/SCLK OUT BIP AGND REFADJ VREF 16 15 14 13 9 10 11 12 D5/SSTRB D4 D3/D11 D2/D10 DGND D1/D9 D0/D8 BUSY DIP/SO Pin Configuration 2.46V REF IN REF OUT 12-BIT SAR ADC OSC CONTROL LOGIC 3-STATE OUTPUT 8-BIT BUS AND SERIAL I/O 18 17 16 15 14 13 11 10 20 19 9 21 D7/DOUT D6/SCLK OUT D5/SSTRB D4 D3/D11 D2/D10 D1/D9 D0/D8 CS RD BUSY HBEN REFADJ VREF AIN + AIN - 5 6 3 4 24 23 V DD CLK/SCLK 71 2 PD 1 22 8 AGND DGND 2 PAR BIP 12 V SS Functional Diagram 19-4506; Rev 4; 2/97 PART TEMP. RANGE PIN-PACKAGE MAX191ACNG 0°C to +70°C 24 Narrow Plastic DIP 24 Wide SO ±1/2 ±1 ±1/2 ERROR (LSB) MAX191BCNG MAX191ACWG 0°C to +70°C 0°C to +70°C MAX191BCWG 0°C to +70°C 24 Wide SO ±1 MAX191BC/D Dice* ±1 0°C to +70°C MAX191AENG -40°C to +85°C 24 Narrow Plastic DIP ±1/2 MAX191BENG -40°C to +85°C 24 Narrow Plastic DIP ±1 MAX191AEWG -40°C to +85°C 24 Wide SO ±1/2 MAX191AMRG 24 Narrow CERDIP** ±1/2 MAX191BMRG 24 Narrow CERDIP** ±1 -55°C to +125°C MAX191BEWG -40°C to +85°C 24 Wide SO ±1 SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. 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. EVALUATION KIT MANUAL FOLLOWS DATA SHEET * Dice are specified at T A = +25°C, DC parameters only. ** Contact factory for availability and processing to MIL-STD-883.
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This note was uploaded on 06/17/2010 for the course ECE 500 taught by Professor Ma during the Spring '10 term at Abraham Baldwin Agricultural College.

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MAX191 12 bit 1 channel - 19-4506; Rev 4; 2/97 NUAL KIT MA...

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