STMicroelectronics ADC1283IPT

Overview

ADC1283IPT from STMicroelectronics is a low-power, 12-bit successive-approximation register (SAR) analog-to-digital converter with 8 single-ended multiplexed inputs, 50–200 ksps conversion rate, SPI-compatible 4-wire serial interface, and operation over −40 °C to +125 °C in TSSOP-16 package. It delivers ±0.9 LSB DNL and ±1.2 LSB INL at 5 V supply, supports independent 2.7–5.5 V analog and digital supplies, and targets high-accuracy industrial sensing where channel density and thermal robustness are critical.

For engineers reviewing the ADC1283IPT datasheet, ADC1283IPT pinout, ADC1283IPT application, or ADC1283IPT equivalent, key selection criteria include its 12-bit resolution with guaranteed no missing codes, 90 dB channel-to-channel isolation, 3.2 mW typical power consumption at 5 V, and full-specified performance across automotive-grade temperature range - all validated under 200 ksps sampling at 3.2 MHz SCLK.

Technical Context

The ADC1283 implements a pure CMOS SAR architecture with integrated track-and-hold, using a capacitive redistribution DAC and fast comparator for 12-bit binary output. Conversion requires exactly 16 SCLK cycles: 3 for acquisition (track) and 13 for evaluation (successive approximation), with MSB-first serial output on DOUT following four leading zeros.

It features independent AVCC and DVCC supplies (2.7–5.5 V each), enabling mixed-voltage system interfacing. Input channels IN0–IN7 are single-ended, referenced to AGND–AVCC, with 33 pF input capacitance in track mode and 4.5 pF in hold mode - requiring careful front-end driver selection to maintain settling accuracy.

Key Specifications

Pinout & Package

TSSOP-16 package: 5.0 mm × 4.4 mm body, 0.65 mm pitch, 1.0 mm max height, RoHS-compliant ECOPACK®2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7953IRHBT and MAX11126ETE+, the ADC1283IPT uniquely balances 8-channel density, −40 °C to +125 °C operation, and sub-1 mW/MSPS power efficiency - making it optimal for thermally demanding, multi-sensor industrial nodes where pin count and BOM simplicity are constrained.

Availability

ADC1283IPT is available at Aetrix Electronics and suitable for industrial process control, shunt resistor monitoring, and strain gauge sensing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADC1283IPT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The ADC1283 belongs to ST's precision data acquisition portfolio, engineered specifically for high-reliability industrial sensing applications demanding wide temperature operation, low power, and guaranteed monotonicity without external calibration.

FAQ

What is the minimum SCLK frequency supported for reliable operation?

The ADC1283IPT supports SCLK frequencies from 0.8 MHz to 3.2 MHz. At 0.8 MHz, the maximum sample rate drops to 50 ksps due to fixed 16-cycle conversion time. Operation below 0.8 MHz violates timing specifications and may cause incomplete conversions or invalid DOUT data - no undersampling mode or reduced-clock functionality is implemented.

How does the ADC handle channel selection when CS is pulsed without writing to DIN?

When CS falls without prior DIN activity, the internal 3-bit channel address register defaults to IN0 (ADD2–ADD0 = 000). The first 12-bit result output on DOUT after 16 SCLK cycles corresponds to IN0. Subsequent conversions repeat IN0 unless new channel address bits are written to DIN before the next CS falling edge.

Can AVCC and DVCC be powered from different voltage sources without violating specifications?

Yes - AVCC and DVCC are fully independent supplies rated 2.7–5.5 V each. They may differ (e.g., AVCC = 5.0 V, DVCC = 3.3 V) without restriction, provided both remain within their respective ranges and AGND/DGND are properly partitioned. This decoupling improves SNR by isolating analog reference noise from digital switching transients.

What is the significance of the four leading zeros in the DOUT data frame?

The DOUT stream always begins with four zero bits followed by the 12-bit conversion result (MSB first). These zeros serve as framing markers and ensure proper bit alignment for host processors that sample on SCLK edges - they are not configurable and appear regardless of channel or supply voltage, providing deterministic synchronization for firmware parsing.