Renesas HI7190IPZ

Overview

The HI7190IPZ from Intersil is a 24-bit sigma-delta analog-to-digital converter with integrated programmable-gain instrumentation amplifier (PGIA), differential analog/reference inputs, and on-demand auto-calibration. It operates from ±5V supplies, delivers 0.0007% typical integral non-linearity, 120dB 50/60Hz noise rejection, and supports input ranges from ±20mV to ±2.5V - ideal for high-precision industrial weighing and seismic monitoring systems.

For engineers reviewing the HI7190IPZ datasheet, HI7190IPZ pinout, HI7190IPZ application, or HI7190IPZ equivalent, key selection considerations include its 20-pin PDIP package, SPI/SSR-compatible serial interface, internal PGIA gain range (1–128), bipolar/unipolar mode flexibility, and guaranteed 22-bit no-missing-code performance across -40°C to +85°C.

Technical Context

The HI7190IPZ implements a third-order sinc³ digital filter synchronized to a user-programmable notch frequency (10Hz–1.953kHz), enabling precise trade-offs between resolution (up to 22 effective bits), conversion speed (settling in ≤4 conversions), and line-frequency noise rejection. Its sigma-delta modulator includes an internal 1-bit DAC feedback loop and integrates transducer burn-out current (200nA) on VINHI for sensor health monitoring.

Calibration is fully programmable via on-chip registers: system calibration includes external circuitry, while self-calibration isolates internal errors. The device supports both synchronous self-clocking (MODE = 1) and external clocking (MODE = 0), with DRDY signaling data readiness and SYNC enabling multi-device synchronization without timing skew.

Key Specifications

Pinout & Package

HI7190IPZ is housed in a 20-lead plastic dual in-line package (PDIP), RoHS-compliant Pb-free plus anneal construction, rated for -40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision sigma-delta ADC applications.

Compared with ADS1258IRTCR and AD7730BRUZ, the HI7190IPZ uniquely combines 120dB line-noise rejection, integrated transducer burn-out current, and multi-device SYNC capability - making it optimal for metrology-grade, EMI-hardened, and sensor-diagnostic applications where absolute accuracy and reliability are prioritized over raw speed.

Availability

HI7190IPZ is available at Aetrix Electronics and suitable for industrial weight scales, process control systems, and laboratory instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant Pb-free packaging.

Supply support for HI7190IPZ 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

Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, aerospace, and test equipment markets.

The HI7190 product line was designed specifically for high-stability, low-frequency measurement applications demanding exceptional linearity, noise immunity, and integrated signal conditioning - targeting weigh scales, seismic sensors, and calibrated instrumentation.

FAQ

What is the operating temperature range for the HI7190IPZ?

The HI7190IPZ is specified for continuous operation from -40°C to +85°C. This industrial-grade temperature range is validated per the Absolute Maximum Ratings and Operating Conditions sections of the FN3612 datasheet, and applies to the HI7190IPZ's Pb-free PDIP package (E20.3 drawing). All electrical specifications, including INL, noise, and calibration stability, are guaranteed across this full range.

Does the HI7190IPZ require an external crystal oscillator?

The HI7190IPZ supports both crystal and external clock sources. A 10MHz crystal may be connected between OSC1 and OSC2, or an external CMOS clock signal can be applied directly to OSC1. The device accepts oscillator frequencies from 0.1MHz to 10MHz; however, the default timing parameters and noise performance data in the datasheet assume a 10MHz source. Using lower frequencies reduces conversion speed and increases RMS noise.

How does the HI7190IPZ handle transducer diagnostics?

The HI7190IPZ provides built-in transducer burn-out detection via a 200nA current source connected to the VINHI pin. When enabled through the Control Register, this current flows through the external sensor (e.g., strain gauge bridge) and allows open-circuit fault detection by monitoring resulting voltage shifts. This feature eliminates the need for discrete diagnostic circuitry and is documented in the Pin Descriptions and Analog Inputs sections of the HI7190IPZ datasheet.

Can the HI7190IPZ operate from a single +5V supply?

Yes - Application Note AN9601 explicitly details single +5V supply operation for the HI7190IPZ. In this configuration, AVSS is tied to AGND (0V), AVDD and DVDD share +5V, and the internal PGIA's common-mode range is adjusted accordingly. Input ranges are reduced versus dual-supply operation, and careful attention must be paid to VCM biasing and reference configuration to maintain linearity and noise performance.

What serial interface protocols does the HI7190IPZ support?

The HI7190IPZ supports both Motorola SPI (3-wire: SCLK, SDO, SDIO, CS) and Intel SSR (2-wire: SCLK, SDIO, CS) protocols via configurable pin SDIO. Its serial interface is fully synchronous, supports MSB-first transmission, descending byte order, and maintains data integrity - if a read is interrupted, DRDY remains active and the current data word is preserved until fully read. These capabilities are defined in the Functional Block Diagram and Serial Interface sections of the HI7190IPZ datasheet.