Analog Devices Inc./Maxim Integrated MAX1191ETI

Overview

The MAX1191ETI from Maxim Integrated is an ultra-low-power, dual-channel, 8-bit analog-to-digital converter (ADC) with 7.5Msps sampling rate, fully differential 440MHz input bandwidth, ±0.512V full-scale range, and 12mW total power consumption at 7.5Msps. It serves as a high-efficiency digitization front-end in battery-powered portable instruments and low-power video receivers.

For engineers reviewing the MAX1191ETI datasheet, MAX1191ETI pinout, MAX1191ETI application, or MAX1191ETI equivalent, key selection considerations include its dual-channel interleaved timing, internal/external reference flexibility, tri-state CMOS-compatible parallel outputs, and three power-down modes enabling sub-µW shutdown current.

Technical Context

The MAX1191ETI employs a seven-stage, fully differential pipelined architecture delivering 5-cycle latency for Channel A and 5.5-cycle latency for Channel B. Its track-and-hold circuits support both fully differential and single-ended analog inputs with matched impedance requirements and VDD/2 common-mode biasing.

It integrates a precision 1.024V bandgap reference to set ±0.512V full-scale range, and supports three reference configurations: internal (REFIN = VDD), buffered external (REFIN = 1.024V), and unbuffered external (REFIN = GND). Digital outputs are multiplexed, offset-binary, and tri-state with independent OVDD supply (1.8V–3.6V).

Key Specifications

Pinout & Package

The MAX1191ETI is housed in a 5mm × 5mm, 28-pin thin QFN package with exposed paddle (EP), rated for -40°C to +85°C operation. The EP is internally connected to GND (Pin 3) and must be externally soldered to a GND plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel 8-bit ADC applications.

Compared with MAX1192ETI, the MAX1191ETI trades sampling speed for ultra-low power and smaller thermal footprint; compared with ADS8325IPW, it delivers 75× higher throughput and integrated differential T/H-but lacks 16-bit resolution for precision sensor interfaces.

Availability

MAX1191ETI is available at Aetrix Electronics and suitable for ultrasound imaging front-ends, WLAN receiver baseband chains, and battery-powered portable instrumentation requiring stable component supply and long-term industrial temperature support.

Supply support for MAX1191ETI 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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX1191ETI belongs to Maxim's ultra-low-power, high-speed ADC product line, engineered specifically for portable and thermally constrained systems requiring dual-channel digitization without sacrificing dynamic performance.

FAQ

What is the maximum analog input frequency supported by the MAX1191ETI?

The MAX1191ETI features a 440MHz small-signal bandwidth and full-power bandwidth, allowing it to accurately sample analog inputs up to 3.75MHz (Nyquist limit at 7.5Msps). Performance metrics like SINAD and SFDR are specified at 1.875MHz and 3.75MHz inputs, confirming robust operation across this range. The device maintains 48.6dB SINAD at 3.75MHz with internal reference and 7.5Msps clock.

Does the MAX1191ETI support single-ended analog inputs?

Yes, the MAX1191ETI supports both fully differential and single-ended analog inputs. For single-ended operation, INA– and INB– must be tied to COM, while signals are applied to INA+ and INB+. The common-mode voltage must be maintained at VDD/2 ±0.2V, and input impedance matching between complementary pins is not required in single-ended mode-simplifying layout for legacy signal sources.

How does the reference configuration affect the full-scale range of the MAX1191ETI?

The MAX1191ETI's full-scale range remains ±0.512V across all three reference modes. In internal mode (REFIN = VDD), the on-chip bandgap generates VREFP and REFN relative to COM. In buffered external mode (REFIN = 1.024V), the internal buffers scale the input to produce the same differential output. In unbuffered mode (REFIN = GND), external sources must drive REFP, REFN, and COM to exact voltages (±0.256V around VDD/2) to maintain the ±0.512V span.

What are the wake-up times from power-down modes on the MAX1191ETI?

The MAX1191ETI provides two fast wake-up modes: Standby mode recovers in 5.5µs, and Shutdown mode recovers in 20µs-both measured as time for SINAD to settle within 0.5dB of its typical value. These latencies are guaranteed by design and characterization (not production tested), and apply when PD0/PD1 transition from low-power states to Normal mode with CLK active.

Can the MAX1191ETI interface directly with a 1.8V FPGA I/O bank?

Yes, the MAX1191ETI supports direct interfacing with 1.8V FPGA I/O banks via its independent OVDD supply pin (Pin 12), which accepts 1.8V–3.6V. When OVDD = 1.8V, the D0–D7 and A/B outputs meet 1.8V CMOS logic thresholds (VOH ≥ 1.44V, VOL ≤ 0.36V at 200µA load), and input leakage remains ±5µA-ensuring reliable level-shifting without external translators.