Description:The ISL26102 and ISL26104 provide a low-noise programmable gain amplifier along with a 24-bit Delta-Sigma Analog-to-Digital Converter with two channel (ISL26102) or four channel (ISL26104) differential, multiplexed inputs. The devices feature exceptional noise performance for conversion rates ranging from 2. 5Sps to 4kSps. The on-chip low-noise programmable-gain amplifier provides gains ranging from 1 to 128, which supports ±19. 5mVFS from a 5V reference. The high input impedance allows direct connection of
Renesas provides a recommended layout and placement guide in the application note AN1443. It suggests keeping the input and output traces short and away from each other, using a solid ground plane, and placing the device close to the power source.
To optimize performance in a noisy environment, use a low-ESR capacitor (e.g., ceramic or film capacitor) for the input and output capacitors, and consider adding a noise filter or a ferrite bead in series with the input voltage. Additionally, ensure good PCB layout practices, such as separating analog and digital grounds.
Although the datasheet specifies a maximum input voltage of 5.5V, the device can handle up to 6V for short periods (e.g., during power-up or voltage transients). However, sustained operation above 5.5V may reduce the device's lifespan or cause damage.
The ISL26104AVZ is rated for operation up to 125°C, but its performance and lifespan may be affected at high temperatures. Consider derating the output current and using a heat sink or thermal management techniques to ensure reliable operation.
Common issues can be caused by poor PCB layout, inadequate input and output capacitors, or incorrect component selection. Check the application note AN1443 for troubleshooting guidelines, and consider using a scope or signal analyzer to diagnose the issue.
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