MAX1202

Features:

 8-Channel Single-Ended or 4-Channel Differential Inputs
 Operates from Single +5V or Dual ±5V Supplies
 User-Adjustable Output Logic Levels (2.7V to 5.25V)
 Low Power: 1.5mA (operating mode) 2A (power-down mode)
 Internal Track/Hold, 133kHz Sampling Rate
 Internal 4.096V Reference (MAX1202)
 SPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface
 Software-Configurable Unipolar/Bipolar Inputs
 20-Pin DIP/SSOP


Application

5V/3V Mixed-Supply Systems
Data Acquisition
High-Accuracy Process Control
Battery-Powered Instruments
Medical Instruments


Pinout




Specifications

V_DD to GND ...............................................................-0.3V to 6V
VL ..............................................................-0.3V to (VDD + 0.3V)
V_SS to GND.................................................................0.3V to -6V
V_DD to V_SS ..............................................................-0.3V to 12V
CH0CH7 to GND............................(V_SS - 0.3V) to (V_DD + 0.3V)
CH0CH7 Total Input Current........................................±20mA
REF to GND................................................-0.3V to (VDD + 0.3V)
REFADJ to GND .........................................-0.3V to (VDD + 0.3V)
Digital Inputs to GND ...............................-0.3V to (VDD + 0.3V)
Digital Outputs to GND ...............................-0.3V to (VL + 0.3V)
Digital Output Sink Current .............................................25mA
Continuous Power Dissipation (TA = +70°C)
     Plastic DIP (derate 11.11mW/°C above +70°C) ..........889mW
     SSOP (derate 8.00mW/°C above +70°C) ....................640mW
     CERDIP (derate 11.11mW°C above +70°C).................889mW
Operating Temperature Ranges
    MAX1202_C_P/MAX1203_C_P ..........................0°C to +70°C
    MAX1202_E_P/MAX1203_E_P..........................-40°C to +85°C
    MAX1202BMJP/MAX1203BMJP..........................-55°C to +125°C
Storage Temperature Range ..............................-60°C to +150°C
Lead Temperature (soldering, 10sec) ................+300°C


Description

The MAX1202/MAX1203 are 12-bit data-acquisition systems specifically designed for use in applications with mixed +5V (analog) and +3V (digital) supply voltages. They operate with a single +5V analog supply or dual ±5V analog supplies, and combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption.

A 4-wire serial interface connects directly to SPI™/MICROWIRE™ devices without external logic, and a serial strobe output allows direct connection to
TMS320-family digital signal processors. The MAX1202/MAX1203 use either the internal clock or an external serial-interface clock to perform successiveapproximation analog-to-digital conversions. The serial interface operates at up to 2MHz.

The MAX1202 features an internal 4.096V reference, while the MAX1203 requires an external reference. Both parts have a reference-buffer amplifier that simplifies gain trim. They also have a VL pin that is the power supply for the digital outputs. Output logic levels (3V, 3.3V, or 5V) are determined by the value of the voltage applied to this pin.

These devices provide a hard-wired SHDN pin and two software-selectable power-down modes. Accessing the serial interface automatically powers up the devices. A quick turn-on time enables the MAX1202/MAX1203 to be shut down between conversions, allowing the user to optimize supply currents. By customizing powerdown between conversions, supply current can drop below 10A at reduced sampling rates.

The MAX1202/MAX1203 are available in 20-pin SSOP and DIP packages, and are specified for the commercial, extended, and military temperature ranges.