Analog Devices Inc./Maxim Integrated MX7575KEWN+

Overview

MX7575KEWN+ 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 a 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 systems.

For engineers reviewing the MX7575KEWN+ datasheet, MX7575KEWN+ pinout, MX7575KEWN+ application, or MX7575KEWN+ equivalent, key selection considerations include its 5µs conversion speed, built-in track/hold for accurate 50kHz signal acquisition, 100ns data-access time, three-state latched outputs, and compatibility with 8085A, Z-80, 6502, and TMS32010 processors in slow-memory or ROM interface modes.

Technical Context

The MX7575KEWN+ uses successive-approximation architecture with internal DAC and comparator, sampling the analog input once at the start of conversion and holding it on the third falling clock edge after CS/RD assertion. Its track/hold circuit supports 386mV/µs slew rate and settles to ±1/4LSB in 7ns.

Control logic supports two primary µP interface modes: slow-memory mode (BUSY tied to READY, forcing wait state) and ROM mode (no wait state, overlapping read/conversion). The TP pin must be hard-wired to VDD for stable operation; leaving it floating causes spurious signals or excessive current draw.

Key Specifications

Pinout & Package

MX7575KEWN+ is housed in an 18-pin wide SOIC (SO) package with gull-wing leads, 0.300" body width, and RoHS-compliant matte tin lead finish. Pin 1 is marked with a dot or bevelled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX165 and MX7576KEWN+, the MX7575KEWN+ uniquely combines 5µs speed, integrated track/hold, and 50kHz bandwidth-making it the only option among the three for closed-loop servo and high-fidelity audio front-ends requiring precise, jitter-free sampling.

Availability

MX7575KEWN+ is available at Aetrix Electronics and suitable for high-speed data acquisition, telecommunications infrastructure, and industrial servo control requiring stable component supply across extended temperature ranges.

Supply support for MX7575KEWN+ 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 industrial, communications, and computing applications.

The MX7575KEWN+ belongs to Maxim's legacy high-speed ADC family targeting µP-based data acquisition systems; it was engineered to replace discrete ADC + track/hold solutions with a single-component, 5V-compatible interface.

FAQ

What is the maximum input signal frequency the MX7575KEWN+ can accurately digitize?

The MX7575KEWN+ supports full-power signal bandwidth up to 50kHz, meaning it can accurately acquire 2.46V_p-p sine waves at that frequency with ≤1LSB error. This is enabled by its on-chip track/hold circuit, which holds the input on the third falling clock edge after CS/RD assertion and settles to ±1/4LSB in 7ns. For higher frequencies, amplitude attenuation and harmonic distortion increase due to limited slew rate (386mV/µs).

How should the TP pin be connected on the MX7575KEWN+?

The TP pin on the MX7575KEWN+ must be hard-wired to VDD. Leaving it open or connecting it to any voltage other than VDD may cause spurious signals or excessive current draw from the VDD rail. This requirement is specific to the MX7575KEWN+ and differs from the MX7576KEWN+, which uses the same pin as MODE. Proper TP connection ensures stable track/hold operation and prevents conversion errors during µP interface cycles.

Does the MX7575KEWN+ require an external clock, or can it operate with an internal oscillator?

The MX7575KEWN+ supports both external and internal clocking. With an external 4MHz clock applied to the CLK pin, it achieves guaranteed 5µs conversion time. Alternatively, an internal oscillator can be configured using RCLK = 100kΩ and CCLK = 100pF, though frequency tolerance is ±50% over temperature and process. For applications demanding tight timing control-such as servo loops or synchronized sampling-the external clock is strongly recommended to ensure consistent 5µs performance.

What are the key differences between the MX7575KEWN+ and MX7576KEWN+?

The MX7575KEWN+ features a 5µs conversion time and integrated track/hold for single-shot acquisition of fast signals, while the MX7576KEWN+ has a 10µs conversion time, no track/hold, and adds a MODE pin for asynchronous continuous conversion. Both share identical pinout, 18-pin wide SO packaging, and µP interface logic. The MX7575KEWN+ is optimal for jitter-sensitive applications like servo control; the MX7576KEWN+ suits streaming data loggers where continuous output matters more than speed.

Can the MX7575KEWN+ interface directly with the Z-80 microprocessor?

Yes, the MX7575KEWN+ interfaces directly with the Z-80 microprocessor using its ROM interface mode. In this configuration, MREQ and RD signals drive CS and RD inputs respectively, allowing the Z-80 to initiate conversions and read prior results without wait states. The BUSY signal is not used for flow control in this mode. Figure 7 of the MX7575KEWN+ datasheet provides the exact connection diagram, confirming compatibility with Z-80's timing requirements and 8-bit data bus structure.