EVALUATION KIT AVAILABLE MAX127/MAX128 Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface General Description Features The MAX127/MAX128 are multirange, 12-bit data acquisi- 12-Bit Resolution, 1/2 LSB Linearity tion systems (DAS) that require only a single +5V supply +5V Single-Supply Operation for operation, yet accept signals at their analog inputs 2 I C-Compatible, 2-Wire Serial Interface that may span above the power-supply rail and below ground. These systems provide eight analog input chan- Four Software-Selectable Input Ranges nels that are independently software programmable for MAX127: 0 to +10V, 0 to +5V, 10V, 5V a variety of ranges: 10V, 5V, 0 to +10V, 0 to +5V for MAX128: 0 to +V , 0 to +V /2, V , REF REF REF the MAX127 and V , V /2, 0 to +V , 0 to REF REF REF V /2 REF +V /2 for the MAX128. This range switching increases REF 8 Analog Input Channels the effective dynamic range to 14 bits and provides the flexibility to interface 420mA, 12V, and 15V-powered 8ksps Sampling Rate sensors directly to a single +5V system. In addition, these 16.5V Overvoltage-Tolerant Input Multiplexer converters are fault protected to 16.5V a fault condition Internal 4.096V or External Reference on any channel will not affect the conversion result of the selected channel. Other features include a 5MHz band- Two Power-Down Modes width track/hold, an 8ksps throughput rate, and the option 24-Pin Narrow PDIP or 28-Pin SSOP Packages of an internal 4.096V or external reference. 2 The MAX127/MAX128 feature a 2-wire, I C-compatible Typical Operating Circuit serial interface that allows communication among multiple devices using SDA and SCL lines. +5V A hardware shutdown input (SHDN) and two softwarepro- grammable power-down modes (standby and full power- 0.1F down) are provided for low-current shutdown between conversions. In standby mode, the reference buffer C remains active, eliminating startup delays. V DD The MAX127/MAX128 are available in 24-pin narrow SCL SDA SHDN PDIP or space-saving 28-pin SSOP packages. CH0 CH1 1k CH2 Applications ANALOG CH3 MAX127 Industrial Control Systems INPUTS CH4 MAX128 CH5 Data-Acquisition Systems CH6 Robotics CH7 Automatic Testing SCL Battery-Powered Instruments SDA A0 Medical Instruments REF A1 REFADJ A2 Ordering Information 4.7F 0.01F DGND AGND INL PART TEMP RANGE PIN-PACKAGE (LSB) MAX127ACNG+ 0C to +70C 24 Narrow PDIP 1/2 MAX127ACNG+ 0C to +70C 24 Narrow PDIP 1 Pin Configurations appear at end of data sheet. +Denotes a lead(Pb)-free/RoHS-compliant package. Ordering Information continued at end of data sheet. 19-4773 Rev 1 12/12MAX127/MAX128 Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface Absolute Maximum Ratings V to AGND ..........................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) DD A AGND to DGND ...................................................-0.3V to +0.3V 24-Pin Narrow PDIP CH0CH7 to AGND ..........................................................16.5V (derate 13.33mW/C above +70C) ..........................1067mW REF to AGND ........................................... -0.3V to (V + 0.3V) 28-Pin SSOP (derate 15mW/C above +70C) .........1201mW DD REFADJ to AGND .................................... -0.3V to (V + 0.3V) Operating Temperature Ranges DD A0, A1, A2 to DGND ................................. -0.3V to (V + 0.3V) MAX127 C /MAX128 C ..........................0C to +70C DD SHDN, SCL, SDA to DGND ....................................-0.3V to +6V MAX127 E /MAX128 E ...................... -40C to +85C Max Current into Any Pin ...................................................50mA Storage Temperature Range ............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C 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 (V = +5V 5% unipolar/bipolar range external reference mode, V = 4.096V 4.7F at REF external clock, f = 400kHz DD REF CLK T = T to T , unless otherwise noted. Typical values are at T = +25C.) A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ACCURACY (Note 1) Resolution 12 Bits MAX127A 1/2 Integral Nonlinearity INL LSB MAX127B/MAX128B 1 Differential Nonlinearity DNL 1 LSB MAX127A 3 Unipolar MAX127B/MAX128B 5 Offset Error LSB MAX127A 5 Bipolar MAX127B/MAX128B 10 Unipolar 0.1 Channel-to-Channel Offset Error LSB Matching Bipolar 0.3 MAX127A 7 Unipolar MAX127B/MAX128B 10 Gain Error (Note 2) LSB MAX127A 7 Bipolar MAX127B/MAX128B 10 Unipolar 3 Gain Tempco (Note 2) ppm/C Bipolar 5 DYNAMIC SPECIFICATIONS (800Hz sine-wave input, 10V (MAX127) or 4.096V (MAX128), f = 8ksps) P-P P-P SAMPLE Signal-to-Noise Plus Distortion SINAD 70 dB Ratio Total Harmonic Distortion THD Up to the 5th harmonic -87 -80 dB Spurious-Free Dynamic Range SFDR 81 dB 4kHz, V = 5V (Note 3) -86 IN Channel-to-Channel Crosstalk dB DC, V = 16.5V -96 IN Aperture Delay 200 ns Aperture Jitter 10 ns Maxim Integrated 2 www.maximintegrated.com