Analog Devices Inc./Maxim Integrated MAX1133BCAP+

Overview

MAX1133BCAP+ from Maxim Integrated is a 16-bit, 200ksps successive-approximation ADC with integrated +4.096V reference, internal track/hold, and SPI/QSPI/MICROWIRE-compatible serial interface. It accepts ±4.096V bipolar or 0 to +4.096V unipolar analog inputs, operates from single +4.75V to +5.25V supplies, and delivers ≥85dB SINAD at 5kHz - ideal for precision medical instrumentation and industrial data-acquisition systems.

For engineers reviewing the MAX1133BCAP+ datasheet, MAX1133BCAP+ pinout, MAX1133BCAP+ application, or MAX1133BCAP+ equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic and DC specifications, real-world use scenarios, and two rigorously cross-checked alternative parts for design continuity.

Technical Context

The MAX1133BCAP+ implements a SAR architecture with on-chip input scaling network enabling true bipolar input operation from a single 5V supply. Its internal bandgap reference (±20ppm/°C tempco) feeds a buffered 4.096V output, adjustable via REFADJ pin, and supports external reference mode when REFADJ is tied to AVDD.

It offers three clocking modes: internal (freeing MCU resources), external (SCLK-driven conversion), and software-configurable acquisition lengths (24 or 32 clocks). Calibration is software-initiated (M1=0, M0=1) and corrects offset, gain, INL, and DNL errors - critical for maintaining accuracy across temperature and supply drift.

Key Specifications

Pinout & Package

MAX1133BCAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch, JEDEC MO-153 compliant, footprint compatible with industry-standard 20-lead SSOP layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8860IDRCT and AD7682BRMZ, the MAX1133BCAP+ uniquely integrates bipolar input scaling, adjustable reference, and three programmable outputs - reducing component count and layout risk in compact, self-contained measurement nodes.

Availability

MAX1133BCAP+ is available at Aetrix Electronics and suitable for industrial process control, portable medical instrumentation, and data-acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX1133BCAP+ 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

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, medical, and communications applications.

The MAX1133BCAP+ belongs to Maxim's high-accuracy SAR ADC product line, engineered specifically for applications needing integrated reference, bipolar input capability, and low-power operation without sacrificing resolution or linearity.

FAQ

What input voltage ranges does the MAX1133BCAP+ support?

The MAX1133BCAP+ supports 0 to +4.096 V (unipolar) and ±4.096 V (bipolar) analog input ranges. These ranges are selected via bit 6 of the serial Control Byte. The device uses an internal input scaler to map these external voltages to its internal DAC range, enabling true bipolar operation from a single +5V supply - a key feature distinguishing MAX1133BCAP+ from many competing 16-bit ADCs.

Does the MAX1133BCAP+ include an internal voltage reference?

Yes, the MAX1133BCAP+ integrates a precision +4.096 V bandgap reference with ±20 ppm/°C temperature coefficient. The REFADJ pin allows fine adjustment of this reference, and pulling REFADJ to AVDD disables the internal buffer for external reference use. This dual-mode reference architecture eliminates the need for external reference ICs in most applications while preserving flexibility for metrology-grade designs.

How does the MAX1133BCAP+ handle calibration?

The MAX1133BCAP+ supports on-demand software calibration to correct offset, gain, INL, and DNL errors. Calibration is initiated by writing a Control Byte with M1 = 0 and M0 = 1. It must be performed in the same clock mode (internal or external) used for conversions and is recommended after power-up, reset, or ambient temperature shifts >10°C. The MAX1133BCAP+ stores calibration coefficients internally, ensuring persistent accuracy without external memory.

What are the functions of the P0, P1, and P2 pins on the MAX1133BCAP+?

P0, P1, and P2 are user-programmable CMOS push-pull outputs controlled by bits [0:2] of the serial Control Byte. They power up low and remain low-impedance during hardware or software shutdown. These pins are designed to directly drive external components such as 8-channel analog multiplexers or programmable-gain amplifiers - eliminating the need for discrete logic or GPIO expansion in compact data-acquisition systems using MAX1133BCAP+.

Can the MAX1133BCAP+ operate with an external clock source?

Yes, the MAX1133BCAP+ supports both internal and external clock modes, selected via bit 5 (INT/EXT) of the Control Byte. In external clock mode, SCLK drives both data transfer and SAR conversion steps, supporting up to 4.8 MHz for 200 ksps operation. SSTRB pulses high for one clock cycle to indicate MSB availability, enabling tight timing synchronization with DSPs like the TMS320 family - a capability explicitly documented for MAX1133BCAP+ in the datasheet.