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Part: MAX191M
Category:
Data Conversion
-> ADC (Analog to Digital Converters)
Description: MAX191 Low-Power, 12-Bit Sampling ADC With Internal Reference And Power-down
Company: Maxim Integrated Products
Datasheet: Download MAX191M datasheet File size : 649 kB
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Datasheet text preview:
19-4506; Rev 4; 2/97
NUAL KIT MA UATION TA SHEET EVAL WS DA FOLLO
Low-Power, 12-Bit Sampling ADC with Internal Reference and Power-Down
General Description ____________________________Features
o o o o o 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 o 100ksps Tested Sampling Rate o Serial and 8-Bit Parallel µP Interface o 24-Pin Narrow DIP and Wide SO Packages
MAX191
The MAX191 is a monolithic, CMOS, 12-bit analog-tod i g i t a l 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 VDD supply current to 50µA max, including the internal-reference current. Decoupling capacitors are the only external components 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 compatible with SPITM, QSPITM, and MICROWIRETM serialinterface standards.
Ordering Information
PART MAX191ACNG MAX191BCNG MAX191ACWG MAX191BCWG MAX191BC/D MAX191AENG MAX191BENG MAX191AEWG MAX191BEWG MAX191AMRG MAX191BMRG 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 -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 24 Narrow Plastic DIP 24 Narrow Plastic DIP 24 Wide SO 24 Wide SO Dice* 24 Narrow Plastic DIP 24 Narrow Plastic DIP 24 Wide SO 24 Wide SO 24 Narrow CERDIP** 24 Narrow CERDIP** ERROR (LSB) ±1/2 ±1 ±1/2 ±1 ±1 ±1/2 ±1 ±1/2 ±1 ±1/2 ±1
________________________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)
* Dice are specified at TA = +25°C, DC parameters only. ** Contact factory for availability and processing to MIL-STD-883.
Pin Configuration
TOP VIEW
PD 1 24 VDD 23 CLK/SCLK 22 PAR 21 HBEN
Functional Diagram
VDD 24 5 VREF 6 REFADJ CLK/SCLK 23 OSC 3-STATE OUTPUT 8-BIT BUS AND SERIAL I/O 18 17 16 15 14 13 11 10 D7/DOUT D6/SCLKOUT D5/SSTRB D4 D3/D11 D2/D10 D1/D9 D0/D8
VSS 2 AIN+ 3 AIN- 4 VREF 5 REFADJ 6 AGND 7 BIP 8 BUSY 9
MAX191
20 CS 19 RD 18 D7/DOUT 17 D6/SCLKOUT 16 D5/SSTRB 15 D4 14 D3/D11 13 D2/D10
2.46V REF 12 AIN + AIN 3 4
MAX191
7 AGND 12 DGND
IN REF OUT 12-BIT SAR ADC 2 VSS
CONTROL LOGIC 1 22 8 BIP PD PAR
20 19 9 21
CS RD BUSY HBEN
D0/D8 10 D1/D9 11 DGND 12
DIP/SO
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products 1
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, 12-Bit Sampling ADC with Internal Reference and Power-Down MAX191
ABSOLUTE MAXIMUM RATINGS
VDD to DGND...-0.3V to +7V VSS to AGND ...-7V to +0.3V VDD to VSS ......12V AGND, VREF, REFADJ to DGND.......-0.3V to (VDD + 0.3V) AIN+, AIN-, PD to VSS .........-0.3V to (VDD + 0.3V) CS, RD, CLK, BIP, HBEN, PAR, to DGND....-0.3V to (VDD + 0.3V) BUSY, D0D7 to DGND......-0.3V to (VDD + 0.3V) Continuous Power Dissipation (TA = +70°C) Narrow Plastic DIP (derate 13.33mW/°C above +70°C)....1067mW Wide SO (derate 11.76mW/°C above +70°C) ....941mW Narrow CERDIP (derate 12.50mW/°C above +70°C) ........1000mW Operating Temperature Ranges MAX191_C_ _ .......0°C to +70°C MAX191_E_ _ ....-40°C to +85°C MAX191_M_ _ ..........-55°C to +125°C Storage Temperature Range....-65°C to +160°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%, VSS = 0V or -5V ±5%, fCLK = 1.6MHz, 50% duty cycle, AIN- = AGND, BIP = 0V, slow-memory mode, internal-reference mode, reference compensation mode--external, synchronous operation, Figure 6, T A = TMIN to TMAX, unless otherwise noted.) (Note 1) PARAMETER DC ACCURACY (Note 2) Resolution Integral Nonlinearity Differential Nonlinearity Offset Error Gain Error (Note 3) Gain-Error Tempco (Note 4) Signal-to-Noise plus Distortion Ratio Total Harmonic Distortion (up to the 5th Harmonic) Spurious-Free Dynamic Range CONVERSION RATE Conversion Time (Note 5) Track/Hold Acquisition Time Aperture Delay Aperture Jitter External Clock Frequency Range (Note 6) fCLK 0.1 25 50 1.6 tCONV Synchronous CLK (12 to 13 CLKs) Internal CLK, CL = 120pF 7.50 6 12 8.125 18 2 µs µs ns ps MHz INL DNL MAX191A MAX191B No missing codes over temperature MAX191A MAX191B MAX191A MAX191B Excludes internal-reference drift ±0.2 12 ±1/2 ±1 ±1 ±1 ±2 ±2 ±3 Bits LSB LSB LSB LSB ppm/°C SYMBOL CONDITIONS MIN TYP MAX UNITS
DYNAMIC ACCURACY (sample rate = 100kHz, VIN = 4Vp-p) SINAD THD SFDR 1kHz input signal, TA = +25°C 1kHz input signal, TA = +25°C 1kHz input signal, TA = +25°C 80 70 -80 dB dB dB
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Low-Power, 12-Bit Sampling ADC with Internal Reference and Power-Down
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 5V ±5%, VSS = 0V or -5V ±5%, fCLK = 1.6MHz, 50% duty cycle, AIN- = AGND, BIP = 0V, slow-memory mode, internal-reference mode, reference compensation mode--external, synchronous operation, Figure 6, T A = TMIN to TMAX, unless otherwise noted.) (Note 1) PARAMETER ANALOG INPUT Input Voltage Range (Note 7) Input Leakage Current Input Capacitance (Note 6) Small-Signal Bandwidth INTERNAL REFERENCE VREF Output Voltage VREF Output Tempco (Note 8) Output Current Capability (Note 9) Load Regulation Output Short-Circuit Current Capacitive Load Required Power-Supply Rejection REFADJ Input Adjustment Range (Note 10) REFADJ Disable Threshold REFADJ Output Voltage REFADJ Input Current REFERENCE INPUT Input Voltage Range Input Current Input Resistance LOGIC INPUTS Input Low Voltage Input High Voltage Input Current Input Current CLK Input Capacitance (Note 6) PD Input Low Voltage PD Input High Voltage PD Input Current PD External Leakage for Float State (Note 12) PD Floating-State Voltage VFLT VIL VIH IIN IIN CIN VIL VIH IIN PD = 0V to VDD (Note 11) Maximum current allowed for "floating state" Reference compensation mode--external 2.8 4.5 ±20 ±100 CS, RD, CLK, HBEN, PAR, BIP CS, RD, CLK, HBEN, PAR, BIP VIN = 0V to VDD PD = high/float PD = low ±0.1 10 0.5 2.4 ±10 ±200 0.8 V V µA µA pF V V µA nA V External-reference mode External-reference = 5V External-reference mode 5 10 2.5 5.0 1 V mA k REFADJ = 5V Reference compensation mode--external VDD = ±5%, VSS = ±5% 4.7 ±300 -60 4.5 2.4 60 30 TA = +25°C MAX191_C MAX191_E MAX191_M TA = +25°C TA = +25°C, IOUT = 0mA to 2mA 18 4.076 4.096 4.116 50 60 80 2 4 mA mV mA µF µV mV V V µA V mA ppm/°C VIN = VSS to VDD 45 2 VSS VD D ±10 80 V µA pF MHz SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX191
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