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MAX146

Maxim
Part Number MAX146
Manufacturer Maxim
Description +2.7Low-Power / 8-Channel / Serial 12-Bit ADCs
Published May 6, 2005
Detailed Description 19-0465; Rev 2; 10/01 EVAALVUAAILTAIOBNLEKIT +2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCs MAX146/MAX147 General De...
Datasheet PDF File MAX146 PDF File

MAX146
MAX146

Overview
19-0465; Rev 2; 10/01 EVAALVUAAILTAIOBNLEKIT +2.
7V, Low-Power, 8-Channel, Serial 12-Bit ADCs MAX146/MAX147 General Description The MAX146/MAX147 12-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption.
The MAX146 operates from a single +2.
7V to +3.
6V supply; the MAX147 operates from a single +2.
7V to +5.
25V supply.
Both devices’ analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.
The 4-wire serial interface connects directly to SPI™/ QSPI™ and MICROWIRE™ devices without external logic.
A serial strobe output allows direct connection to TMS320-family digital signal processors.
The MAX146/MAX147 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.
The MAX146 has an internal 2.
5V reference, while the MAX147 requires an external reference.
Both parts have a reference-buffer amplifier with a ±1.
5% voltageadjustment range.
These devices provide a hard-wired SHDN pin and a software-selectable power-down, and can be programmed to automatically shut down at the end of a conversion.
Accessing the serial interface automatically powers up the MAX146/MAX147, and the quick turn-on time allows them to be shut down between all conversions.
This technique can cut supply current to under 60µA at reduced sampling rates.
The MAX146/MAX147 are available in 20-pin DIP and SSOP packages.
For 4-channel versions of these devices, see the MAX1246/MAX1247 data sheet.
________________________Applications ____________________________Features o 8-Channel Single-Ended or 4-Channel Differential Inputs o Single-Supply Operation +2.
7V to +3.
6V (MAX146) +2.
7V to +5.
25V (MAX147) o Internal 2.
5V Reference (MAX146) o Low Power 1.
2mA (133ksps, 3V supply) 54µA (1ksps, 3V supply) 1µA (power-down mode) o SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface ...


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