Description:The Intersil HI7190 is a monolithic instrumentation, sigma delta A/D converter which operates from ±5V supplies. Both the signal and reference inputs are fully differential for maximum flexibility and performance. An internal Programmable Gain Instrumentation Amplifier (PGIA) provides input gains from 1 to 128 eliminating the need for external pre-amplifiers. The on-demand converter autocalibrate function is capable of removing offset and gain errors existing in external and internal circuitry. The on-board
Renesas provides a recommended PCB layout guide in their application note AN1469, which includes guidelines for component placement, routing, and thermal management to ensure optimal performance and minimize noise.
The HI7190IPZ can output up to 1A of current. To handle this, it's recommended to use a PCB with a thick copper layer (at least 2 oz) and to use wide traces (at least 50 mils) to minimize voltage drops and heat generation. Additionally, consider using a heat sink or thermal pad to dissipate heat.
While the datasheet specifies an operating temperature range of -40°C to 125°C, it's recommended to derate the device's performance at high temperatures. Renesas provides a thermal derating chart in their datasheet to help designers determine the maximum operating temperature for their specific application.
To ensure EMC, follow Renesas' guidelines for PCB layout, component selection, and shielding. Use a metal shield or a shielded enclosure to minimize electromagnetic radiation. Additionally, consider using a common-mode choke or ferrite bead to filter out high-frequency noise.
Renesas recommends a specific power-up sequence to ensure proper device operation. The sequence is: VCC, then VREF, then EN (enable) pin. This sequence helps prevent latch-up and ensures that the device starts up in a stable state.
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HI7190IPZ Overview
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