The MAX1142/MAX1143 are 200ksps, 14-bit ADCs. These serially interfaced ADCs connect directly to SPI™, QSPI™, and MICROWIRE™ devices without external logic. They combine an input scaling network, internal track/hold, a clock, +4.096V reference, and three general-purpose digital output pins (for external multiplexer or PGA control) in a 20-pin SSOP package. The excellent dynamic performance (SINAD ≥ 81dB), high-speed (200ksps), and low power (7.5mA) of these ADCs, make them ideal for applications such as indus- trial process control, instrumentation, and medical applications. The MAX1142 accepts input signals of 0 to +12V (unipolar) or ±12V (bipolar), while the MAX1143 accepts input signals of 0 to +4.096V (unipo- lar) or ±4.096V (bipolar). Operating from a single +4.75V to +5.25V analog supply and a +4.75V to +5.25V digital supply, power-down modes reduce cur- rent consumption to 1mA at 10ksps and further reduce supply current to less than 20µA at slower data rates. A serial strobe output (SSTRB) allows direct connection to the TMS320-family of digital signal processors. The MAX1142/MAX1143 user can select either the internal clock, or an external serial-interface clock for the ADC to perform analog-to-digital conversions. The MAX1142/MAX1143 feature internal calibration cir- cuitry to correct linearity and offset errors. On-demand calibration allows the user to optimize performance. Three user-programmable logic outputs are provided for the control of an external multiplexer or PGA.
The MAX1142 and MAX1143 are 14‑bit analog‑to‑digital converters that operate from a single 5 V supply and provide up to 200 ksps sampling rates. They include an input scaling network, internal reference, track‑hold circuitry, and three user‑programmable logic outputs for multiplexing or PGA control.
The devices support SPI, QSPI, and MICROWIRE serial interfaces, selectable internal or external clocks, and on‑demand calibration to correct linearity and offset errors. They are suited for industrial process control, instrumentation, and portable battery‑powered equipment.
| Resolution | 14 bits |
|---|---|
| Maximum Sampling Rate | 200 ksps |
| Power‑down Current (Shutdown Mode) | 2.5 µA |
| SINAD (typical) | ≥81 dB |
| Integral Nonlinearity (INL) | ≤1 LSB |
Both devices can sample at up to 200 ksps (200 k samples per second).
In shutdown mode the device draws about 2.5 µA.