ISL26134

Low-Noise 24-bit Delta Sigma ADC

Product Status: Mass Production

OVERVIEW

The ISL26132 and ISL26134 are complete analog front ends for high resolution measurement applications. These 24-bit Delta-Sigma Analog-to-Digital Converters include a very low-noise amplifier and are available as either two or four differential multiplexer inputs. The devices offer the same pinout as the ADS1232 and ADS1234 devices and are functionally compatible with these devices. The ISL26132 and ISL26134 offer improved noise performance at 10Sps and 80Sps conversion rates.

The on-chip low-noise programmable-gain amplifier provides gains of 1x/2x/64x/128x. The 128x gain setting provides an input range of ±9.766mVFS when using a 2.5V reference. The high input impedance allows direct connection of sensors, such as load cell bridges to ensure the specified measurement accuracy without additional circuitry. The inputs accept signals 100mV outside the supply rails when the device is set for unity gain.

The Delta-Sigma ADC features a third order modulator providing up to 21.6-bit noise-free performance. The device can be operated from an external clock source, crystal (4.9152MHz typical), or the on-chip oscillator.

The two channel ISL26132 is available in a 24 Ld TSSOP package and the four channel ISL26134 is available in a 28 Ld TSSOP package. Both are specified for operation over the automotive temperature range (-40°C to +105°C).

KEY FEATURES

  • Up to 21.6 Noise-free bits
  • Low noise amplifier with gains of 1x/2x/64x/128x
  • RMS noise: 10.6nV @ 10Sps (PGA = 128x)
  • Linearity error: 0.0002% FS
  • Simultaneous rejection of 50Hz and 60Hz (@ 10Sps)
  • Two (ISL26132) or four (ISL26134) channel differential input multiplexer
  • On-chip temperature sensor (ISL26132)
  • Automatic clock source detection
  • Simple interface to read conversions
  • +5V Analog, +5 to +2.7V digital supplies
  • Pb-Free (RoHS compliant)
  • TSSOP packages: ISL26132, 24 pin; ISL26134, 28 pin

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL26134
Basic Information
生产状态
Mass Production
器件/通道数量
4
分辨率位
24
最大转换率 (kSPS)
0.08
INL (%FS)
2.0E-4
噪声 (μVrms)
1.2
功耗 (mW)
50
模拟电源电压最小值 (V)
5
模拟电源电压最大值 (V)
5
数字电源电压最小值 (V)
2.7 V
数字电源电压最大值 (V)
5 V
资质级别
Standard
数字电源电压V
2.7 to 5
模拟电源电压V
5
CAN 采样
YES
温度范围
-40 to +105

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