Analog Devices Inc./Maxim Integrated MAX1090BCEI+T

Overview

MAX1090BCEI+T from Maxim Integrated is a 10-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated +2.5V reference, 8-channel single-ended or 4-channel pseudo-differential analog input multiplexer, and byte-wide parallel (8+2) interface. It operates from a single +5V analog supply and supports digital logic levels from +2.7V to +5.5V via VLOGIC. Designed for battery-powered data-acquisition systems, it delivers 400ksps sampling at 2.5mA supply current and features automatic power-down with 2µs wake-up.

For engineers reviewing the MAX1090BCEI+T datasheet, MAX1090BCEI+T pinout, MAX1090BCEI+T application, or MAX1090BCEI+T equivalent, key selection considerations include its software-configurable unipolar/bipolar input mode, ±0.5 LSB integral nonlinearity, 6MHz full-power bandwidth track-and-hold, QSOP-28 package compatibility, and support for both internal and external clock acquisition modes.

Technical Context

The MAX1090BCEI+T implements a charge-redistribution SAR architecture with an integrated 12pF capacitive DAC and on-chip track-and-hold stage. Its analog front-end supports configurable input topology-single-ended (CH0–CH7 referenced to COM) or pseudo-differential (e.g., CH0/CH1 pair), where only the positive input is sampled while the negative input must remain stable within ±0.5 LSB.

Control is executed via an 8-bit parallel interface with dedicated WR, RD, CS, and HBEN signals; conversion is initiated by writing a configuration byte that selects channel (A2–A0), input mode (SGL/DIF, UNI/BIP), acquisition method (ACQMOD), and power-down state (PD1/PD0). The device tri-states INT when CS is high and supports both internal (3.6µs fixed conversion time) and external (7.6MHz max) clocking.

Key Specifications

Pinout & Package

MAX1090BCEI+T is housed in a 28-pin QSOP (Quarter Size Outline Package) with 0.15mm lead pitch and standard JEDEC MO-137AC footprint. Pin functions are validated per Maxim's official datasheet revision 2 (12/02).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with MAX1090ACEI+T, the MAX1090BCEI+T trades guaranteed ±0.5 LSB INL for cost efficiency while retaining identical timing, power, and interface behavior; versus ADS7822U, it delivers higher throughput, integrated reference, and parallel simplicity at the expense of serial interface flexibility and smaller package size.

Availability

MAX1090BCEI+T is available at Aetrix Electronics and suitable for industrial control systems, portable data-acquisition systems, and energy management equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX1090BCEI+T 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) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for industrial, medical, and communications markets.

The MAX1090 series belongs to Maxim's precision data-converter product line, designed specifically for low-power, space-constrained applications demanding integrated references, flexible input configurations, and robust parallel interfacing without external support components.

FAQ

What is the operating temperature range for MAX1090BCEI+T?

The MAX1090BCEI+T is rated for commercial temperature operation from 0°C to +70°C, as indicated by the "C" suffix in its ordering code. This range is validated per Maxim's datasheet revision 2 and covers typical industrial and consumer environments where ambient temperatures remain within this span. The device maintains ±1 LSB INL and full 400ksps performance across this interval without derating.

Does MAX1090BCEI+T require an external crystal or clock source?

No, the MAX1090BCEI+T does not require an external crystal. It supports both internal clock mode (enabled via control byte bits D7/D6) and external clock mode (up to 7.6MHz). In internal mode, the device generates its own conversion clock, eliminating external timing components. External clock mode is used when precise aperture control or lower jitter (<50ps) is required, typically with a clean CMOS/TTL oscillator.

How many analog input channels does MAX1090BCEI+T support?

The MAX1090BCEI+T supports eight single-ended analog input channels (CH0–CH7) or four pseudo-differential input pairs (e.g., CH0/CH1, CH2/CH3). This is confirmed in the Pin Configurations diagram and Electrical Characteristics table, which specify "8-Channel Single-Ended / 4-Channel Pseudo-Differential" for the MAX1090 family. The MAX1092 variant reduces this to four single-ended channels.

Can MAX1090BCEI+T operate with a 3.3V digital supply?

Yes, the MAX1090BCEI+T supports digital logic supplies from +2.7V to +5.5V via the VLOGIC pin, making it fully compatible with 3.3V microcontrollers and FPGAs. When VLOGIC = 3.3V, the D7–D0 outputs swing between 0V and 3.3V, and input thresholds (VIH/VIL) scale accordingly-ensuring reliable handshaking without level-shifting circuitry.

What is the purpose of the HBEN pin on MAX1090BCEI+T?

The HBEN (High-Byte Enable) pin on MAX1090BCEI+T controls multiplexing of the 10-bit conversion result onto the 8-bit data bus. When HBEN = 1, D1 and D0 carry bits D9 and D8 respectively; when HBEN = 0, D7–D0 carry the 8 LSBs (D7–D0). This allows full 10-bit reads in two consecutive bus cycles, preserving compatibility with standard 8-bit parallel interfaces without requiring wider data paths.