The MAX1240/MAX1241 are low-power, 12-bit analog-to-digital converters (ADCs) available in 8-pin packages. The MAX1240 operates with a single +2.7V to +3.6V supply, and the MAX1241 operates with a single +2.7V to +5.25V supply. Both devices feature a 7.5µs successive-approximation ADC, a fast track/hold (1.5µs), an on-chip clock, and a high-speed, 3-wire serial interface. Power consumption is only 37mW (VDD = 3V) at the 73ksps maximum sampling speed. A 2µA shutdown mode reduces power at slower throughput rates. The MAX1240 has an internal 2.5V reference, while the MAX1241 requires an external reference. The MAX1241 accepts signals from 0V to VREF, and the reference input range includes the positive supply rail. An external clock accesses data from the 3-wire interface, which connects directly to standard microcontroller I/O ports. The interface is compatible with SPI™, QSPI™, and MICROWIRE™. Excellent AC characteristics and very low power combined with ease of use and small package size make these converters ideal for remote-sensor and data-acquisition applications, or for other circuits with demanding power consumption and space requirements. The MAX1240/MAX1241 are available in 8-pin DIP and SO packages. Applications include battery-powered systems, portable data logging, isolated data acquisition, and process control instrumentation.
The MAX1240 and MAX1241 are low‑power, 12‑bit successive‑approximation ADCs offered in 8‑pin DIP/SO packages. The MAX1240 operates from a single +2.7 V to +3.6 V supply and includes an internal 2.5 V reference, while the MAX1241 operates from +2.7 V to +5.25 V and requires an external reference. Both devices feature a fast track/hold circuit, a 3‑wire serial interface compatible with SPI/QSPI/MICROWIRE, and a shutdown mode that reduces current to below 10 µA.
Typical specifications include a 73 ksps maximum conversion rate, 37 mW power consumption at 3 V for the MAX1240, 12‑bit resolution, and input voltage ranges of 0 V to VREF (MAX1240) or 1 V to VPP (MAX1241). The datasheet provides detailed absolute maximum ratings, electrical characteristics, timing diagrams, pin descriptions, and package dimensions.
| Supply Voltage (MAX1240) | +2.7 V to +3.6 V |
|---|---|
| Supply Voltage (MAX1241) | +2.7 V to +5.25 V |
| Resolution | 12 bits |
| Maximum Sampling Rate | 73 ksps |
| Internal Reference (MAX1240) | 2.5 V |
| Input Voltage Range (MAX1240) | 0 V to VREF |
| Input Voltage Range (MAX1241) | 1 V to VPP |
The MAX1240 operates from a single supply of +2.7 V to +3.6 V.
Both the MAX1240 and MAX1241 can sample up to 73 ksps.
Yes, the MAX1240 includes an internal 2.5 V reference.