Analog Devices Inc./Maxim Integrated MX7575JCWN

Overview

MX7575JCWN 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, 0V to 2VREF input range, and single +5V supply operation - used in high-speed data acquisition systems requiring precise sampling of up to 50kHz full-power signals.

For engineers reviewing the MX7575JCWN datasheet, MX7575JCWN pinout, MX7575JCWN application, or MX7575JCWN equivalent, key selection considerations include its 18-pin wide SO package, 100ns data-access time, BUSY-synchronized µP interface, and compatibility with 8085A, Z-80, 6502, and TMS32010 processors.

Technical Context

The MX7575JCWN employs a successive-approximation register (SAR) architecture with internal DAC and comparator, using a 4MHz external clock or internal RC oscillator to complete conversion in exactly 20 clock cycles (10 internal cycles). Its track/hold acquires the analog input on the third falling clock edge after CS/RD assertion, enabling jitter-free sampling at fixed intervals when synchronized to a real-time clock source.

It features three-state latched digital outputs (D0–D7), active-low CS and RD control logic, and a BUSY signal that transitions low at conversion start and high at completion. The TP pin must be hard-wired to VDD for stable operation; leaving it floating risks spurious behavior or excessive VDD current draw.

Key Specifications

Pinout & Package

MX7575JCWN is housed in an 18-pin wide SO (Small Outline) package, surface-mount compatible, with 0.3" body width and standard JEDEC MO-153 footprint. Pin 1 is marked by notch or dot; pin numbering follows counterclockwise convention from top-left 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 MAX166, MX7575JCWN offers external reference control and single-ended input simplicity, making it optimal for cost-sensitive, space-tolerant systems where reference optimization or differential signaling isn't required.

Availability

MX7575JCWN is available at Aetrix Electronics and suitable for high-speed data acquisition, telecommunications front-ends, and audio systems requiring stable component supply across industrial temperature ranges (0°C to +70°C).

Supply support for MX7575JCWN 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 and mixed-signal ICs for industrial, communications, and computing markets.

The MX7575/MX7576 product line was designed for µP-centric data acquisition systems demanding fast, low-power, easy-to-interface 8-bit conversion without external support components.

FAQ

What is the maximum recommended source impedance for the AIN pin of the MX7575JCWN?

The MX7575JCWN analog input requires a driving source impedance of ≤2kΩ to ensure full accuracy and prevent settling errors in the track/hold circuit. Higher impedances degrade DC offset, increase acquisition time, and reduce effective SNR - especially critical at full-scale 50kHz input frequencies. This specification is confirmed in the "Analog Input" section of the MX7575JCWN datasheet under "DC Input Impedance" and "Slew Rate, Tracking" parameters.

Can the MX7575JCWN operate with an internal clock, and what are the component values?

Yes, the MX7575JCWN supports internal clock generation using RCLK = 100kΩ (2%) and CCLK = 100pF (1%) connected to the CLK pin as shown in Figure 16a of the datasheet. This configuration yields a nominal 4MHz internal clock, though process variation may cause ±50% frequency deviation. For timing-critical applications, an external 4MHz clock is recommended to guarantee 5µs conversion time.

Is the MX7575JCWN pin-compatible with the MX7575JN or MX7575KN variants?

Yes, the MX7575JCWN shares identical pinout and electrical specifications with MX7575JN and MX7575KN - all are functionally equivalent 8-bit ADCs differing only in package (18-pin wide SO vs. 18-pin plastic DIP) and temperature grade (all rated 0°C to +70°C). No PCB redesign is needed when migrating between these variants, provided mechanical clearance accommodates the wider SO body.

What is the purpose of the TP pin on the MX7575JCWN, and how must it be connected?

The TP (Test Point) pin on the MX7575JCWN must be hard-wired to VDD for correct internal biasing and stable operation. Leaving TP floating or connecting it to any voltage other than VDD may cause spurious BUSY transitions, increased VDD current draw, or conversion failure. This requirement is explicitly stated in the "Pin Description" and "Detailed Description" sections of the MX7575JCWN datasheet.

Does the MX7575JCWN support differential input, and what are its input voltage limits?

No, the MX7575JCWN supports only single-ended unipolar analog input on the AIN pin, with a valid range of 0V to 2VREF (i.e., 0V to 2.46V when REF = 1.23V). It does not implement differential input architecture - that functionality is exclusive to the MAX166, which is cited in the datasheet as the recommended alternative for differential applications.