Analog Devices Inc./Maxim Integrated MX7575JEWN+

Overview

MX7575JEWN+ from Maxim Integrated is an 8-bit, microprocessor-compatible analog-to-digital converter (ADC) with on-chip track/hold, 5µs conversion time, ±1LSB total unadjusted error, and 50kHz full-power signal bandwidth. It operates from a single +5V supply with 1.23V external reference and interfaces directly to 8-bit µP data buses via CS, RD, and BUSY control signals for high-speed data acquisition in real-time control systems.

For engineers reviewing the MX7575JEWN+ datasheet, MX7575JEWN+ pinout, MX7575JEWN+ application, or MX7575JEWN+ equivalent, key selection considerations include its 5µs conversion speed, built-in track/hold for accurate 50kHz signal capture, 100ns data-access time, three-state latched outputs, and compatibility with slow-memory and ROM-style µP interfaces.

Technical Context

The MX7575JEWN+ uses successive-approximation architecture with internal DAC and comparator, where sampling occurs once at conversion start-triggered by CS/RD assertion-and held on the third falling edge of the clock. Its track/hold supports 386mV/µs slew rate and 2.46V_p-p sine input at 10kHz with 45dB SNR.

It features dual clock operation: internal oscillator (RCLK=100kΩ, CCLK=100pF) or external 4MHz clock; BUSY output signals conversion start (falling edge) and completion (rising edge); all eight data outputs (D0–D7) are latched and three-state buffered for direct µP bus connection without external logic.

Key Specifications

Pinout & Package

MX7575JEWN+ is housed in an 18-pin wide SOIC (SO) package with gull-wing leads, 0.3" body width, and standard JEDEC MS-013AC footprint. Pin 1 is marked with a dot or beveled corner; pin numbering follows counterclockwise convention from top-left when viewed from component side.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, µP-compatible ADC applications.

Compared with MAX165BCNG+, MX7575JEWN+ provides superior dynamic performance for 50kHz signals due to its integrated track/hold, while AD7820KNZ offers faster conversion at the cost of increased system complexity and power-making MX7575JEWN+ optimal for µP-based data acquisition where accuracy, simplicity, and moderate speed are prioritized.

Availability

MX7575JEWN+ is available at Aetrix Electronics and suitable for industrial data acquisition, telecom channel monitoring, and low-power environmental logging requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MX7575JEWN+ 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and RF ICs for industrial, communications, and computing applications.

The MX7575JEWN+ belongs to Maxim's legacy high-speed µP-compatible ADC family, designed specifically for embedded systems needing fast, simple, and reliable analog digitization without external support components.

FAQ

What is the maximum input signal frequency the MX7575JEWN+ can accurately digitize?

The MX7575JEWN+ supports full-power signal bandwidth up to 50kHz, meaning it can accurately acquire and digitize 2.46V_p-p sine waves at that frequency with ≤1LSB error. This capability relies on its integrated track/hold circuit, which holds the input on the third falling clock edge after CS/RD assertion. For signals beyond 50kHz, amplitude accuracy degrades due to slew-rate limiting (386mV/µs) and reduced SNR.

Does the MX7575JEWN+ require an external reference, and why?

Yes, the MX7575JEWN+ requires a precise 1.23V external reference applied to the REF pin. Its internal DAC uses an "inverted voltage output" topology that draws transient currents during conversion, making it sensitive to reference impedance. A low-AC-impedance source-such as an ICL8069 shunt reference with 0.1µF ceramic and 47µF bulk capacitors-is mandatory to maintain ±1LSB accuracy and prevent gain errors.

How does the MX7575JEWN+ interface with an 8085A microprocessor?

The MX7575JEWN+ interfaces with the 8085A in slow-memory mode: CS and RD connect to address-decoded I/O select and RD lines, BUSY drives the READY input, and TP is tied to VDD. When the 8085A executes an IN instruction, CS/RD go low, BUSY falls to force a wait state, and the track/hold captures the signal on the third clock edge. After 5µs, BUSY rises, releasing READY and completing the read with valid D0–D7 data.

Can the MX7575JEWN+ operate with an internal clock, and what are the trade-offs?

Yes, the MX7575JEWN+ supports internal clocking using RCLK=100kΩ and CCLK=100pF on the CLK pin. However, process and temperature variations cause ±50% frequency tolerance, leading to conversion times ranging from ~2.5µs to ~7.5µs. For applications demanding tight timing control-such as deterministic servo updates or synchronization to external events-an external 4MHz clock is recommended to guarantee 5µs ±10% performance.

What is the purpose of the TP pin on the MX7575JEWN+, and how must it be connected?

The TP (Test Point) pin on the MX7575JEWN+ must be hard-wired to VDD for proper operation. It is not a user-accessible test node-it biases internal circuitry. Leaving TP floating or connecting it to any voltage other than VDD may cause spurious BUSY transitions, excessive VDD current draw, or erratic conversion results. This requirement is explicitly documented in the datasheet's Pin Description and Detailed Description sections.