Low-Noise 24-bit Delta Sigma ADC

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 sensors such as load cell bridges to ensure the specified measurement accuracy without additional circuitry.

Features

• Programmable gain amplifier with gains of 1 to 128

• Low noise: 7nV/√Hz @ PGA = 128

• Linearity error: 0.0002 FS

• Output word rates up to 4kSps

• Low-side switch for load cell power management

• +5V analog and +2.7V to +5V digital supplies

• ISL26102 in 24 Ld TSSOP

• ISL26104 in 28 Ld TSSOP

• ESD 7.5kV - HBM

Applications

• Weigh scales

• Temperature monitors and controls

• Load safety systems

• Industrial process control

• Pressure sensors