The MAX148/MAX149 are 10-bit data acquisition systems that combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. They operate from a single +2.7V to +5.25V supply, and sample at up to 133ksps. 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 MAX148/MAX149 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions. The MAX149 has an internal 2.5V reference, while the MAX148 requires an external reference. Both parts have a reference-buffer amplifier with a ±1.5% voltage-adjustment range. These devices provide a hard-wired SHDN pin and a software-selectable power-down, and can be pro-grammed to automatically shut down at the end of a con- version. Accessing the serial interface automatically powers up the MAX148/MAX149, and the quick turn-on time allows them to be shut down between all conver- sions. This technique can cut supply current to under 60µA at reduced sampling rates. The MAX148/MAX149 are available in a 20-pin DIP and a 20-pin SSOP. For 4-channel versions of these devices, see the MAX1248/MAX1249 data sheet.
The MAX148 and MAX149 are 10‑bit, low‑power, 8‑channel (or 4‑channel) data‑acquisition ADCs with a single‑supply operation from +2.7 V to +5.25 V. They feature an on‑chip multiplexer, track/hold circuitry, and a 4‑wire serial interface compatible with TMS320 DSPs.
The devices offer internal (MAX149) or external reference options, selectable unipolar/bipolar inputs, and a maximum conversion rate of 133 ksps. Detailed pin functions, timing diagrams, and package dimensions are provided for DIP and SSOP formats.
| Supply Voltage Range | +2.7 V to +5.25 V |
|---|---|
| Resolution | 10 bits |
| Maximum Sampling Rate | 133 ksps |
| Low‑Power Current (133 ksps, 3 V) | 1.2 mA |
| Internal Reference (MAX149) | 2.5 V |
| Package Types | 20‑pin DIP, 20‑pin SSOP |
The devices operate from +2.7 V to +5.25 V.
Both parts can sample up to 133 ksps.
Each device provides 8 channels (with 4‑channel versions available).
Yes, the MAX149 has an internal 2.5 V reference.