MAX195 19-0377 Rev 1 12/97 16-Bit, 85ksps ADC with 10A Shutdown General Description Features The MAX195 is a 16-bit successive-approximation ana- 16 Bits, No Missing Codes log-to-digital converter (ADC) that combines high 90dB SINAD speed, high accuracy, low power consumption, and a 9.4s Conversion Time 10A shutdown mode. Internal calibration circuitry cor- rects linearity and offset errors to maintain the full rated 10A (max) Shutdown Mode performance over the operating temperature range with- Built-In Track/Hold out external adjustments. The capacitive-DAC architec- AC and DC Specified ture provides an inherent 85ksps track/hold function. Unipolar (0V to V ) and Bipolar (-V to V ) REF REF REF The MAX195, with an external reference (up to +5V), Input Range offers a unipolar (0V to V ) or bipolar (-V to V ) REF REF REF pin-selectable input range. Separate analog and digital Three-State Serial-Data Output supplies minimize digital-noise coupling. Small 16-Pin DIP, SO, and Ceramic SB Packages The chip select (CS) input controls the three-state serial- data output. The output can be read either during conver- sion as the bits are determined, or following conversion at Ordering Information up to 5Mbps using the serial clock (SCLK). The end-of- conversion (EOC) output can be used to interrupt a PART TEMP. RANGE PIN-PACKAGE processor, or can be connected directly to the convert MAX195BCPE 0C to +70C 16 Plastic DIP input (CONV) for continuous, full-speed conversions. MAX195BCWE 0C to +70C 16 Wide SO The MAX195 is available in 16-pin DIP, wide SO, and MAX195ACDE 0C to +70C 16 Ceramic SB ceramic sidebraze packages. MAX195BC/D 0C to +70C Dice* MAX195BEPE -40C to +85C 16 Plastic DIP Applications MAX195BEWE -40C to +85C 16 Wide SO Portable Instruments MAX195AEDE -40C to +85C 16 Ceramic SB Audio MAX195AMDE -55C to +125C 16 Ceramic SB** Industrial Controls MAX195BMDE -55C to +125C 16 Ceramic SB** Robotics * Dice are specified at T = +25C, DC parameters only. A Multiple Transducer Measurements ** Contact factory for availability and processing to MIL-STD-883. Medical Signal Acquisition Functional Diagram Vibrations Analysis Digital Signal Processing 13 Pin Configuration AIN 4 VDDD MAIN DAC 12 6 REF DGND 11 VSSD TOP VIEW 16 VDDA 14 AGND BP/UP/SHDN VDDA 1 COMPARATOR 16 CALIBRATION 15 VSSA DACs CLK VSSA 2 15 SCLK AGND 3 14 SAR VDDD MAX195 AIN 4 13 MAX195 2 CLK DOUT REF 5 12 3 5 SCLK DOUT 9 DGND 6 VSSD 11 CONV THREE-STATE BUFFER 1 CONTROL LOGIC EOC RESET 7 10 BP/UP/SHDN 8 7 CS EOC CS 9 CONV 8 10 RESET DIP/Wide SO/Ceramic SB Maxim Integrated Products 1 For free samples & the latest literature: 16-Bit, 85ksps ADC with 10A Shutdown ABSOLUTE MAXIMUM RATINGS VDDD to DGND .....................................................................+7V Continuous Power Dissipation (T = +70C) A VDDA to AGND......................................................................+7V Plastic DIP (derate 10.53mW/C above +70C) ............842mW VSSD to DGND.........................................................+0.3V to -6V Wide SO (derate 9.52mW/C above +70C)..................762mW VSSA to AGND .........................................................+0.3V to -6V Ceramic SB (derate 10.53mW/C above +70C)...........842mW VDDD to VDDA, VSSD to VSSA..........................................0.3V Operating Temperature Ranges AIN, REF ....................................(VSSA - 0.3V) to (VDDA + 0.3V) MAX195 C E ........................................................0C to +70C AGND to DGND..................................................................0.3V MAX195 E E .....................................................-40C to +85C Digital Inputs to DGND...............................-0.3V, (VDDA + 0.3V) MAX195 MDE..................................................-55C to +125C Digital Outputs to DGND............................-0.3V, (VDDA + 0.3V) Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+300C 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 (VDDD = VDDA = +5V, VSSD = VSSA = -5V, f = 1.7MHz, V = +5V, T = T to T , unless otherwise noted. Typical CLK REF A MIN MAX values are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ACCURACY (Note 1) Resolution RES 16 Bits MAX195A 1 Differential Nonlinearity DNL LSB MAX195B 2 MAX195A 0.003 Integral Nonlinearity INL %FSR MAX195B 0.004 MAX195A, V = 4.75V 3 REF Unipolar/Bipolar Offset Error LSB MAX195B, V = 4.75V 4 REF Unipolar/Bipolar Offset Tempco 0.4 ppm/C Unipolar Full-Scale Error V = 4.75V 0.0075 %FSR REF Bipolar Full-Scale Error V = 4.75V 0.018 %FSR REF Full-Scale Tempco 0.1 ppm/C VDDA = 4.75V to 5.25V, V = 4.75V 65 Power-Supply Rejection REF dB Ratio (VDDA and VSSA only) VSSA = -5.25V to -4.75V, V = 4.75V 65 REF ANALOG INPUT Unipolar 0 V REF Input Range V Bipolar -V V REF REF Unipolar 250 Input Capacitance pF Bipolar 125 DYNAMIC PERFORMANCE (f = 85kHz, bipolar range AIN = -5V to +5V, 1kHz) (Note 1) s Signal-to-Noise plus Distortion SINAD T = +25C 87 90 dB A Ratio (Note 2) Total Harmonic Distortion (up to THD T = +25C -97 -90 dB A the 5th harmonic) (Note 2) Peak Spurious Noise (Note 2) T = +25C -90 dB A Conversion Time t 16 (t ) 9.4 s CONV CLK Clock Frequency f 1.7 MHz CLK (Notes 3, 4) Serial Clock Frequency f 5 MHz SCLK 2 MAX195