Analog Devices Inc./Maxim Integrated MX7576KCWN+

Overview

MX7576KCWN+ from Maxim Integrated is an 8-bit, microprocessor-compatible analog-to-digital converter (ADC) with 10µs conversion time, single +5V supply operation, 0V to 2VREF input range, and 100ns data-access time - designed for high-speed data acquisition in embedded signal processing systems.

For engineers reviewing the MX7576KCWN+ datasheet, MX7576KCWN+ pinout, MX7576KCWN+ application, or MX7576KCWN+ equivalent, key selection considerations include its asynchronous conversion mode (via MODE pin), external/external-clock flexibility (2MHz max), ±1LSB total unadjusted error, and compatibility with 8-bit µPs including 8085A, Z-80, and TMS32010.

Technical Context

The MX7576KCWN+ uses successive-approximation architecture with internal DAC and comparator, sampling the analog input eight times per conversion - once before each bit decision - enabling stable digitization without on-chip track/hold. Its internal clock oscillator supports RC timing (RCLK=100kΩ, CCLK=100pF), while external clock operation allows precise timing control at up to 2MHz.

Interface logic includes CS and RD for conversion initiation and data access, BUSY for status indication, and MODE pin (low = asynchronous continuous conversion; high = synchronous/ROM mode). All digital outputs (D0–D7, BUSY) are three-state latched, enabling direct connection to µP data buses without external buffers.

Key Specifications

Pinout & Package

MX7576KCWN+ is housed in an 18-pin wide SO (Small Outline) package, RoHS-compliant, with 0.3" body width and gull-wing leads. Pin 1 is marked by a beveled corner; thermal pad is not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX166, MX7576KCWN+ offers lower system cost with external reference flexibility but lacks differential input; versus AD7820KN, it trades raw speed for single-supply simplicity and tighter accuracy - making it optimal for modern embedded µP-based acquisition.

Availability

MX7576KCWN+ is available at Aetrix Electronics and suitable for high-speed data acquisition, telecommunications front-end design, and low-power data logging requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MX7576KCWN+ 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 semiconductor company specializing in precision analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.

The MX7575/MX7576 product line was engineered for µP-centric data acquisition systems demanding fast, low-power, single-supply 8-bit conversion - targeting cost-sensitive, space-constrained embedded instrumentation.

FAQ

What is the maximum recommended clock frequency for MX7576KCWN+?

The MX7576KCWN+ specifies a maximum external clock frequency of 2MHz for guaranteed 10µs conversion time and full accuracy. Operating above this frequency may cause timing violations in the internal SAR logic, leading to invalid codes or increased TUE. The internal oscillator, configured with RCLK=100kΩ and CCLK=100pF, typically yields ~2MHz but varies ±50% across process and temperature - so external clocking is advised for timing-critical applications. MX7576KCWN+ must never be driven with clocks exceeding 2MHz.

Does MX7576KCWN+ include an on-chip track/hold function?

No, MX7576KCWN+ does not include an on-chip track/hold function. Unlike the MX7575 variant, the MX7576 samples the analog input eight times during conversion - once before each successive-approximation decision - but relies on external signal conditioning for slew-rate handling. Its full-power bandwidth is not specified; the 50kHz figure applies only to the MX7575. For high-frequency inputs, designers must ensure source impedance ≤2kΩ and use external anti-alias filtering. MX7576KCWN+ requires clean, low-impedance analog drive to meet ±1 LSB TUE.

How is the MODE pin used on MX7576KCWN+?

The MODE pin on MX7576KCWN+ selects between two primary interface modes: when MODE is low, the device enters asynchronous continuous conversion mode - performing conversions back-to-back regardless of RD/CS state, with BUSY indicating completion. When MODE is high, it operates in synchronous mode (RD/CS-triggered) or ROM interface mode (RD/CS initiate conversion and fetch prior result). Pulling MODE high via 10kΩ to VDD is required for standard operation; leaving it floating risks undefined behavior. MX7576KCWN+ functionality depends critically on correct MODE pin biasing.

Can MX7576KCWN+ operate with a 3.3V supply?

No, MX7576KCWN+ is specified exclusively for +5V supply operation (4.75V to 5.25V). Its internal logic thresholds, output drive strength (VOH=4.0V min, VOL=0.4V max), and reference architecture assume a 5V rail. Attempting 3.3V operation will result in non-functional digital outputs, failed conversions, and potential latch-up due to violated absolute maximum ratings (e.g., VDD to DGND < –0.3V). No 3.3V-compatible derivative exists in the MX7575/MX7576 family. MX7576KCWN+ must be powered from a regulated 5V source.

What is the purpose of the TP pin on MX7576KCWN+?

The TP (Test Point) pin on MX7576KCWN+ is not used - it is reserved for factory testing and has no functional role in normal operation. Unlike the MX7575, which requires TP tied to VDD for proper track/hold operation, the MX7576 replaces TP with the MODE pin (pin 3). On MX7576KCWN+, pin 3 is labeled MODE in all official documentation and pinouts; TP does not appear in its functional diagram or pin description table. Any reference to TP in MX7576KCWN+ context is erroneous. MX7576KCWN+ pin 3 is strictly the MODE control input.