Analog Devices Inc./Maxim Integrated MX7575JP+T

Overview

MX7575JP+T from Maxim Integrated is an 8-bit, microprocessor-compatible analog-to-digital converter (ADC) with on-chip track/hold, 5µs conversion time, ±1 LSB total unadjusted error, 50kHz full-power signal bandwidth, and single +5V supply operation. It digitizes unipolar analog inputs from 0V to 2.46V (2×V_REF) for high-speed data acquisition in embedded control systems.

For engineers reviewing the MX7575JP+T datasheet, MX7575JP+T pinout, MX7575JP+T application, or MX7575JP+T equivalent, this page delivers verified electrical parameters, PLCC-20 package interface details, timing-critical µP interface guidance, and validated alternative options for real-time signal acquisition designs.

Technical Context

The MX7575JP+T uses successive-approximation architecture with internal track/hold that acquires input signals on the third falling edge of CLK after CS/RD assertion. Its 5µs conversion time requires a 4MHz external clock or internal RC oscillator (R_CLK=100kΩ, C_CLK=100pF), delivering 200kSPS throughput at ±1 LSB accuracy.

It interfaces directly to 8-bit µPs via three-state D0–D7 outputs, BUSY status flag, and standard CS/RD control logic-supporting slow-memory wait-state and ROM-style non-blocking read modes. The TP pin must be hard-wired to VDD for stable operation; leaving it floating causes spurious behavior.

Key Specifications

Pinout & Package

MX7575JP+T is housed in a 20-lead plastic leaded chip carrier (PLCC) with J-bend leads, designed for surface-mount reflow assembly and socket compatibility. Pin 1 is marked by a corner notch; the package footprint matches JEDEC MS-018AC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX165CPP+, MX7575JP+T offers superior dynamic performance (50kHz bandwidth vs. ~10kHz) due to integrated track/hold, while AD7820KN trades supply simplicity for raw speed-making MX7575JP+T optimal for new +5V µP-based designs needing balanced speed, accuracy, and integration.

Availability

MX7575JP+T is available at Aetrix Electronics and suitable for high-speed servo loops, digital signal processing front-ends, and low-power data loggers requiring stable component supply across extended production cycles.

Supply support for MX7575JP+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The MX7575JP+T belongs to Maxim's legacy high-speed µP-compatible ADC family, engineered for deterministic real-time signal acquisition in resource-constrained embedded systems with strict timing and power budgets.

FAQ

What is the maximum input signal frequency the MX7575JP+T can accurately digitize?

The MX7575JP+T supports full-power bandwidth up to 50kHz, meaning it can accurately acquire and convert sine-wave inputs up to 50kHz with 2.46V_pp amplitude and maintain ±1 LSB accuracy. This is enabled by its on-chip track/hold circuit, which handles input slew rates up to 386mV/µs. For higher frequencies, aliasing and SNR degradation occur unless preceded by appropriate anti-alias filtering.

Does the MX7575JP+T require an external clock, or can it operate with an internal oscillator?

The MX7575JP+T supports both external and internal clocking. With an external 4MHz clock applied to the CLK pin, it achieves guaranteed 5µs conversion time. Alternatively, it can use an internal RC oscillator formed by R_CLK=100kΩ and C_CLK=100pF, though oscillator frequency may vary ±50% across temperature and process-making external clock mandatory for timing-critical applications. The MX7575JP+T ignores the CLK input after conversion completion.

How should the TP pin be connected on the MX7575JP+T, and what happens if it's left unconnected?

The TP (test point) pin on the MX7575JP+T must be hard-wired to VDD. If left floating or connected to any voltage other than VDD, the device exhibits spurious behavior including incorrect conversions, unstable BUSY signaling, and excessive current draw from VDD. This requirement is specific to the MX7575JP+T and differs from the MX7576's MODE pin; proper TP biasing ensures correct internal logic state initialization during power-up and conversion cycles.

Can the MX7575JP+T interface directly with a Z-80 microprocessor without additional logic?

Yes, the MX7575JP+T interfaces directly with the Z-80 in ROM interface mode using only MREQ, RD, and address decode signals-no glue logic required. In this configuration, CS and RD are asserted together to start a conversion and read prior result; BUSY indicates conversion progress. The MX7575JP+T's three-state outputs and 100ns data-access time align with Z-80 timing, enabling seamless integration into existing Z-80-based instrumentation designs.

What is the purpose of separate AGND and DGND pins on the MX7575JP+T, and how should they be routed?

The MX7575JP+T separates analog ground (AGND) and digital ground (DGND) to prevent digital switching noise from corrupting analog measurements. They must be connected at a single point-typically at the power supply filter capacitor ground-to avoid ground loops. AGND should route directly from REF, AIN, and analog decoupling caps; DGND connects to VDD bypass caps and digital control lines. Improper separation degrades INL and increases noise floor beyond the specified ±1 LSB error.