Analog Devices Inc./Maxim Integrated MX7575JCWN+T

Overview

MX7575JCWN+T from Maxim Integrated is a CMOS, microprocessor-compatible 8-bit 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 three-state latched outputs for high-speed data acquisition in embedded control systems.

For engineers reviewing the MX7575JCWN+T datasheet, MX7575JCWN+T pinout, MX7575JCWN+T application, or MX7575JCWN+T equivalent, key selection considerations include its 5µs conversion time, built-in track/hold for accurate 50kHz signal acquisition, 100ns data-access time, ±1LSB TUE accuracy, and compatibility with slow-memory and ROM-style µP interfaces using CS/RD/BUSY handshaking.

Technical Context

The MX7575JCWN+T uses successive-approximation architecture with an internal DAC and comparator loop, completing conversion in exactly 20 input clock cycles (10 internal clock cycles). Its track/hold acquires the analog input on the third falling edge of CLK after CS and RD go low, enabling precise timing-critical sampling.

It supports both internal RC oscillator (RCLK = 100kΩ, CCLK = 100pF) and external clock (4MHz max), with BUSY signaling start/end of conversion and three-state D0–D7 outputs synchronized to RD. 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

MX7575JCWN+T is housed in an 18-pin wide SOIC (Small Outline Integrated Circuit) package, 7.5mm body width, with gull-wing leads and standard JEDEC MS-013AC footprint. Pin 1 is marked by a beveled corner or dot; pins are numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX165, MX7575JCWN+T offers external reference control for precision calibration but requires additional components; compared with MX7576JCWN+T, it delivers faster acquisition and higher analog bandwidth at the cost of single-sample fidelity.

Availability

MX7575JCWN+T is available at Aetrix Electronics and suitable for high-speed servo loops, telecommunications monitoring, digital signal processing, and low-power data loggers requiring stable component supply across industrial temperature ranges (0°C to +70°C).

Supply support for MX7575JCWN+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) designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The MX7575JCWN+T belongs to Maxim's legacy high-speed µP-compatible ADC family, engineered specifically for embedded data acquisition systems demanding sub-10µs latency, deterministic timing, and minimal external component count.

FAQ

What is the maximum input frequency the MX7575JCWN+T can accurately digitize?

The MX7575JCWN+T supports full-power analog input signals up to 50kHz - meaning a 2.46V_P-P sine wave at 10kHz (386mV/µs slew rate) is acquired and converted with ±1LSB linearity. This is enabled by its on-chip track/hold, which captures the signal on the third falling clock edge after CS/RD assertion. Higher frequencies suffer aperture uncertainty and reduced SNR, as shown in Figure 13 of the MX7575JCWN+T datasheet.

Does the MX7575JCWN+T require an external clock, or can it operate with an internal oscillator?

The MX7575JCWN+T supports both modes: an external 4MHz clock applied to the CLK pin, or an internal RC oscillator using RCLK = 100kΩ and CCLK = 100pF. Internal oscillation varies ±50% due to process spread, so external clocking is mandatory for applications requiring guaranteed ≤5µs conversion time or deterministic timing across units and temperature. The MX7575JCWN+T ignores the CLK input after conversion completes, allowing continuous external clock operation.

How should the TP pin be connected on the MX7575JCWN+T?

The TP (Test Point) pin on the MX7575JCWN+T must be hard-wired to VDD. Leaving TP floating or connecting it to any voltage other than VDD causes spurious internal signals and excessive current draw from the VDD rail, leading to erratic conversion behavior or failure. This requirement is explicitly stated in the "Detailed Description" section of the MX7575JCWN+T datasheet and applies exclusively to the MX7575 variant - the MX7576 uses MODE instead of TP.

What is the purpose of separate AGND and DGND pins on the MX7575JCWN+T?

The MX7575JCWN+T separates analog ground (AGND) and digital ground (DGND) to prevent digital switching noise from modulating the analog input path. AGND returns the AIN, REF, and internal track/hold circuits; DGND returns the BUSY, D0–D7, CS, and RD drivers. These grounds must be joined at a single point - typically the power supply star ground - to avoid ground loops while preserving noise isolation. This separation is essential to achieve the specified ±1LSB TUE and 45dB SNR performance.

Can the MX7575JCWN+T interface directly with a Z-80 microprocessor?

Yes, the MX7575JCWN+T supports Z-80 interfacing in ROM mode using MREQ and RD signals, as documented in Figure 7 of its datasheet. In this configuration, CS and RD are asserted together to start a conversion and read prior result; BUSY indicates conversion progress. The MX7575JCWN+T's 100ns data-access time and three-state outputs ensure compatibility with Z-80's 2MHz–4MHz bus timing without wait states. No level-shifting or bus transceivers are needed for direct connection.