Analog Devices Inc./Maxim Integrated MAX1122EGK+D

Overview

MAX1122EGK+D from Maxim Integrated is a 10-bit, 170Msps analog-to-digital converter optimized for high IF sampling up to 500MHz in wideband communication systems. It operates from a single 1.8V supply, consumes 460mW at full rate, achieves 57.5dB SNR at 10MHz input, and delivers 72dBc SFDR at 100MHz - enabling digital predistortion receivers in cellular base-station transceivers.

For engineers reviewing the MAX1122EGK+D datasheet, MAX1122EGK+D pinout, MAX1122EGK+D application, or MAX1122EGK+D equivalent, this page provides verified technical context, LVDS output timing behavior, on-chip divide-by-2 clock control, differential analog input interface, and industrial-temperature (–40°C to +85°C) QFN-68EP packaging details essential for RF receiver design and high-speed data acquisition validation.

Technical Context

The MAX1122EGK+D employs a fully differential pipelined architecture with integrated track-and-hold and internal 1.23V bandgap reference. Its analog inputs (INP/INN) are self-biased at 1.4V common-mode voltage and support ±0.3125V differential swing (1.25V_P-P), enabling AC-coupled operation for optimal dynamic performance.

It features LVDS-compatible differential clock inputs (CLKP/CLKN) with internal duty-cycle equalization, selectable divide-by-2 clock division via CLKDIV, and LVDS digital outputs (D0P/N–D9P/N, DCLKP/N, ORP/N) with user-selectable two's complement or offset binary format controlled by the T/B pin.

Key Specifications

Pinout & Package

MAX1122EGK+D is housed in a 68-pin QFN package with exposed pad (EP), specified for –40°C to +85°C operation. The exposed pad must be connected to AGND for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed ADC applications.

Compared with MAX1122EGK+, MAX1123EGK+ extends usable bandwidth by 23% with minimal architectural change, while MAX1124EGK+ trades 2 bits of resolution for 47% higher sampling rate - making each alternative optimal only when its specific speed/resolution trade-off matches the system's signal processing pipeline constraints.

Availability

MAX1122EGK+D is available at Aetrix Electronics and suitable for cellular infrastructure, radar subsystems, and communications test equipment requiring stable component supply with guaranteed industrial-temperature performance and long-term obsolescence management.

Supply support for MAX1122EGK+D 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 high-speed data conversion ICs for demanding RF, industrial, and communications applications.

The MAX1122EGK+D belongs to Maxim's high-speed ADC product line, engineered specifically for wideband IF digitization in wireless infrastructure where dynamic range, power efficiency, and LVDS interoperability are critical.

FAQ

What is the maximum analog input frequency supported by the MAX1122EGK+D?

The MAX1122EGK+D supports a full-power analog bandwidth of 600MHz, enabling direct sampling of signals up to 500MHz with maintained SNR and SFDR performance. At 500MHz input, it achieves 56.5dB SNR and 63.5dBc SFDR - validated across the industrial temperature range and confirmed in the device's Typical Operating Characteristics plots.

Does the MAX1122EGK+D require an external reference, or does it include an internal one?

The MAX1122EGK+D integrates an internal 1.23V bandgap reference and reference-scaling amplifier. REFIO and REFADJ pins allow either internal reference activation (REFADJ tied to AGND) or external reference injection (REFADJ tied to AVCC). No external reference IC is required unless system-level calibration demands tighter initial accuracy or temperature drift specs than the internal reference provides.

How is the output data format selected on the MAX1122EGK+D?

The MAX1122EGK+D output format is controlled by the T/B pin: logic low selects two's complement format, and logic high selects offset binary. The pin has an internal pulldown resistor, so leaving it unconnected defaults to two's complement. This selection directly affects the interpretation of D9–D0 outputs and is independent of the LVDS physical layer signaling.

What is the purpose of the CLKDIV pin on the MAX1122EGK+D?

The CLKDIV pin enables the MAX1122EGK+D's on-chip divide-by-2 clock circuit. When CLKDIV = 0, the digital outputs update at half the input clock rate, reducing sensitivity to input clock jitter and easing clock distribution requirements. When CLKDIV = 1, outputs update at the full input clock rate. The pin has an internal pulldown, allowing open-circuit default to divide-by-2 mode.

Can the MAX1122EGK+D operate with a single-ended clock input?

Although the MAX1122EGK+D is optimized for differential LVDS clock inputs (CLKP/CLKN), it accepts single-ended clock signals applied to CLKP with CLKN grounded - per the Absolute Maximum Ratings and Applications Information section. However, dynamic performance (SFDR, SNR) degrades by 3–6dB compared to differential drive, and jitter sensitivity increases significantly; differential clocking is strongly recommended for production designs.