5V / 8-CHANNEL / SERIAL / 10-BIT ADC
Description
19-1179; Rev 0; 1/97
5V, 8-Channel, Serial, 10-Bit ADC with 3V Digital Interface
_______________General Description
The MAX1204 is a 10-bit data-acquisition system specifically designed for use in applications with mixed +5V (analog) and +3V (digital) supply voltages.
It operates with a single +5V analog supply or dual ±5V analog supplies, and combines an 8-channel multiplexer, internal 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 MAX1204 uses either the internal clock or an external serialinterface clock to perform successive-approximation analog-to-digital conversions.
The serial interface operates at up to 2MHz.
The MAX1204 features an internal 4.
096V reference and a reference-buffer amplifier that simplifies gain trim.
It also has a VL pin that supplies power to the digital outputs.
Output logic levels (3V, 3.
3V, or 5V) are determined by the value of the voltage applied to this pin.
A hard-wired SHDN pin and two software-selectable power-down modes are provided.
Accessing the serial interface automatically powers up the device.
A quick turn-on time allows the MAX1204 to be shut down between conversions, enabling the user to optimize supply currents.
By customizing power-down between conversions, supply current can drop below 10µA at reduced sampling rates.
The MAX1204 is available in 20-pin SSOP and DIP packages, and is specified for the commercial, extended, and military temperature ranges.
____________________________Features
o 8-Channel Single-Ended or 4-Channel Differential Inputs o Operates from +5V Single or ±5V Dual Supplies o User-Adjustable Output Logic Levels (2.
7V to 5.
25V) o Low Power: 1.
5mA (operating mode) 2µA (power-down mode) o Internal Track/Hold, 133kHz Sampling Rate o Internal 4.
096V Reference o SPI/Microwire...
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