Features: 12-Bit Resolution, 1/2 LSB Linearity
+5V Single-Supply Operation
I2C-Compatible, 2-Wire Serial Interface
Four Software-Selectable Input Ranges
-MAX127: 0 to +10V, 0 to +5V, ±10V, ±5V
-MAX128: 0 to +VREF, 0 to +VREF/2, ±VREF, ±VREF/2
8 Analog Input Channels
8ksps Sampling Rate
±16.5V Overvoltage-Tolerant Input Multiplexer
Internal 4.096V or External Reference
Two Power-Down Modes
24-Pin Narrow DIP or 28-Pin SSOP PackagesApplication-Industrial Control Systems
-Data-Acquisition Systems
-Robotics
-Automatic Testing
-Battery-Powered Instruments
-Medical Instruments Pinout
SpecificationsVDD to AGND............................................................-0.3V to +6V
AGND to DGND......................................................-0.3V to +0.3V
CH0CH7 to AGND.........................................................±16.5V
REF to AGND...............................................-0.3V to (VDD+ 0.3V)
REFADJ to AGND.........................................-0.3V to (VDD+ 0.3V)
A0, A1, A2 to DGND....................................-0.3V to (VDD+ 0.3V)
SHDN</a>, SCL, SDA to DGND................................-0.3V to +6V
Max Current into Any Pin....................................................50mA
Continuous Power Dissipation (TA= +70°C)
24-Pin Narrow DIP (derate 13.33mW/°C above +70°C)..1067mW
28-Pin SSOP (derate 9.52mW/°C above +70°C)..........762mW
Operating Temperature Ranges
MAX127_C__/MAX128_C__................................0°C to +70°C
MAX127_E__/MAX128_E__..............................-40°C to +85°C
Storage Temperature Range ........................-65°C to +150°C
Lead Temperature (soldering, 10sec) ...........................+300°CDescriptionThe MAX127/MAX128 are multirange, 12-bit data acquisition systems (DAS) that require only a single +5V supply for operation, yet accept signals at their analog inputs that may span above the power-supply rail and below ground. These systems provide eight analog input channels that are independently software programmable for a variety of ranges: ±10V, ±5V, 0 to +10V, 0 to +5V for the MAX127; and ±VREF, ±VREF/2, 0 to +VREF , 0 to +VREF/2 for the MAX128. This range switching increases the effective dynamic range to 14 bits and provides the flexibility to interface 420mA, ±12V, and ±15V-powered sensors directly to a single +5V system. In addition, these converters are fault pro-tected to ±16.5V; a fault condition on any channel will not affect the conversion result of the selected channel. Other features include a 5MHz bandwidth track/hold, an 8ksps throughput rate, and the option of an internal 4.096V or external reference.
The MAX127/MAX128 feature a 2-wire, I2C-compatible serial interface that allows communication among multi-ple devices using SDA and SCL lines.
A hardware shutdown input (SHDN</a>) and two software-programmable power-down modes (standby and full power-down) are provided for low-current shutdown between conversions. In standby mode, the reference- buffer remains active, eliminating start-up delays.
The MAX127/MAX128 are available in 24-pin DIP or space-saving 28-pin SSOP packages.
MAX127 Data Sheet
