MAX112x0 - 24-Bit Ultra-Low Power, Delta-Sigma ADC

The MAX11200/MAX11210 are ultra-low-power (< 300 µA active current), high-resolution, serial output ADCs. These devices provide the highest resolution per unit power in the industry, and are optimized for applications that require very high dynamic range with low power, such as sensors on a 4 mA...20 mA industrial control loop. Optional input buffers provide isolation of the signal inputs from the switched capacitor sampling network allowing these converters to be used with high-impedance sources without compromising available dynamic range or linearity.

The devices provide a high-accuracy internal oscillator that requires no external components. When used with the specified data rates, the internal digital filter provides more than 100 dB rejection of 50 Hz or 60 Hz line noise. The devices are configurable using the SPI™ interface and include four GPIOs that can be used for external mux control. The MAX11210 includes digital programmable gain of 1, 2, 4, 8, or 16.

The MAX11200/MAX11210 operate over the -40...+85°C temperature range, and are available in a 16-pin QSOP package.

Key Features

24.0-bit ENOB at 5 sps
- 20.9-bit noise-free resolution at 10 sps
- 19-bit noise-free resolution at 120 sps
570 n_VRMS noise at 10 sps, ±3.6 V_FS input
1 ppm INL (typ), 10 ppm (max)
No missing codes
Ultra-low power dissipation
- Operating-mode current drain < 300 µA (max)
- Sleep-mode current drain < 0.4 µA
Programmable gain (1, 2, 4, 8, or 16) (MAX11210)
Four SPI-controlled GPIOs for external Mux control
2.7...3.6 V analog supply voltage range
1.7...3.6 V digital and I/O supply voltage range
Fully differential signal and reference inputs
High-impedance inputs
- Optional input buffers on both signal and reference inputs
Programmable internal clock or external clock mode
> 100 dB (min) 50 Hz/60 Hz rejection
SPI, QSPI™, MICROWIRE™-compatible serial interface
On-demand offset and fain self-calibration and system calibration
User-programmable offset and gain registers
-40...+85 °C operating temperature range
±2 kV ESD protection
Lead(Pb)-free and RoHS-compliant QSOP package