MAX1144/MAX1145 are 150ksps, 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, clock, and three general-purpose digital output pins (for external multiplexer or PGA con- trol) in a 20-pin SSOP package. The excellent dynamic performance (THD ≥ 90dB), high speed (150ksps in bipolar mode), and low power (8.0mA) of these ADCs make them ideal for applications such as industrial process control, instrumentation, and medical applica- tions. The MAX1144 accepts input signals of 0 to +6V (unipo- lar) or ±6V (bipolar), while the MAX1145 accepts input signals of 0 to +2.048V (unipolar) or ±2.048V (bipolar). Operating from a single 3.135V to 3.465V analog digital supply, powerdown modes reduce current consump- tion to 0.15mA at 10ksps and further reduce supply current to less than 20µA slower data rates. A serial strobe output (SSTRB) allows direct connection to the TMS320 family digital-signal processors. The MAX1144/MAX1145 user can select either the internal clock or an external serial-interface clock for the ADC to perform analog-to-digital conversions. The MAX1144/MAX1145 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 8-channel mux or PGA. The MAX1144/MAX1145 a
The MAX1144 and MAX1145 are 14‑bit successive‑approximation ADCs that operate from a single 3.3 V supply. They provide up to 150 ksps in bipolar mode (125 ksps in unipolar mode) and include an internal input scaler, calibration circuitry, and three user‑programmable digital output pins for external multiplexers or PGAs. The devices are offered in a 20‑pin SSOP package and are specified for –40 °C to +85 °C operation.
The datasheet details electrical characteristics, timing specifications, pin configurations, and typical application circuits. It also lists ordering information for temperature‑graded parts and provides package dimensions for PCB layout.
| Resolution | 14 bits |
|---|---|
| Maximum Sampling Rate (bipolar) | 150 ksps |
| Maximum Sampling Rate (unipolar) | 125 ksps |
| Supply Voltage | 3.3 V single‑supply (3.135 V‑3.465 V) |
| Typical Power Consumption (unipolar) | 5 mA typ |
| Shutdown Current (unipolar) | 0.1 µA |
| Input Range (MAX1144) | 0 V to +6 V (unipolar) or ±6 V (bipolar) |
| Input Range (MAX1145) | 0 V to +2.048 V (unipolar) or ±2.048 V (bipolar) |
| Package | 20‑pin SSOP |
| User‑Programmable Logic Outputs | Three |
The devices can sample at up to 150 ksps in bipolar mode and 125 ksps in unipolar mode.
They operate from a single 3.3 V supply, with a recommended range of 3.135 V to 3.465 V.
Three user‑programmable logic output pins are provided for external multiplexers or PGAs.
The shutdown current is about 0.1 µA (1.2 µA typ) in unipolar mode.