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 accurate sampling of up to 50kHz full-power signals.

For engineers reviewing the MX7575JCWN+ datasheet, MX7575JCWN+ pinout, MX7575JCWN+ application, or MX7575JCWN+ equivalent, this page delivers verified technical context, real-world interface timing constraints, package-specific layout guidance for wide SO-18, and validated alternatives for µP-based signal acquisition designs.

Technical Context

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

It supports three µP interface modes: slow-memory (READY-driven wait state), ROM interface (non-blocking read), and - unlike the MX7576 - does not support asynchronous mode. Timing parameters including t3 (100ns data-access time) and t6 (80ns data-access after BUSY) are guaranteed over 0°C to +70°C.

Key Specifications

Pinout & Package

MX7575JCWN+ is housed in an 18-pin wide SOIC (SO-18) package, 7.5mm body width, 0.050" lead pitch, gull-wing leads - compatible with standard surface-mount reflow profiles and IPC-7351B SOIC18_W75P600X210-18 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX165CNG+, MX7575JCWN+ offers lower power (15mW vs. 18mW) and avoids internal reference drift over temperature, while AD7820KNZ trades integration for raw speed - making MX7575JCWN+ optimal for µP-tight, thermally constrained, and cost-sensitive DAQ designs requiring deterministic 5µs latency.

Availability

MX7575JCWN+ is available at Aetrix Electronics and suitable for high-speed data acquisition, telecommunications monitoring, and audio signal conditioning 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, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MX7575JCWN+ belongs to Maxim's legacy high-speed µP-compatible ADC family, designed specifically for embedded systems needing fast, low-power, easy-to-interface digitization without external support circuitry.

FAQ

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

The MX7575JCWN+ supports full-power bandwidth up to 50kHz - meaning it can accurately acquire and convert a 2.46V_P-P sine wave at that frequency with ≤±1LSB error. This is enabled by its on-chip track/hold, which settles in <7ns to ±1/4LSB. For higher frequencies, amplitude attenuation and harmonic distortion increase per the SNR vs. frequency curve (Figure 13 in MX7575/MX7576 datasheet). The MX7575JCWN+ is not specified for undersampled RF applications.

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

The MX7575JCWN+ supports both external and internal clocking. With external clock, it requires a 4MHz TTL/CMOS signal applied to the CLK pin. With internal clock, it uses an external RC network (100kΩ resistor + 100pF capacitor) connected to CLK - generating ~4MHz oscillation. Internal clock variation is ±50% over temperature and process, so external clock is recommended for timing-critical applications. The MX7575JCWN+ ignores the clock input after conversion completes.

How should the TP (Test Point) pin be connected on the MX7575JCWN+?

The TP pin on the MX7575JCWN+ must be hard-wired to VDD. Leaving it floating or connecting it to any voltage other than VDD may cause spurious operation, excessive current draw, or erratic BUSY signaling. This requirement is specific to the MX7575 variant (not MX7576); the TP pin has no function in MX7576 and is unused. No pull-up or series resistor is needed - direct metal trace to VDD is mandatory per Maxim's application guidance.

Can the MX7575JCWN+ be used in bipolar input configurations?

Yes, the MX7575JCWN+ supports bipolar operation via external op-amp circuitry (e.g., Figure 18a in datasheet), producing offset-binary output codes corresponding to ±2.46V input range. The internal AIN pin remains unipolar (0V to 2VREF), so external level-shifting and scaling are required. Calibration resistors R1–R7 (0.1% tolerance) set gain and offset; if omitted, the device retains its ±1LSB accuracy over the translated range. Bipolar use does not affect conversion time or power consumption of the MX7575JCWN+.

What is the purpose of separating AGND and DGND on the MX7575JCWN+?

AGND and DGND are separate pins on the MX7575JCWN+ to prevent digital switching noise from corrupting analog measurements. DGND carries return current from D0–D7, BUSY, CS, RD, and TP; AGND carries return current from AIN, REF, and internal analog circuitry. They must be connected at a single point - typically near the device or at the power supply filter - to avoid ground loops. Splitting planes and routing analog traces away from digital lines preserves the ±1LSB accuracy spec of the MX7575JCWN+ across its operating temperature range.