ISL28158

Micro-power Single Precision Rail-to-Rail Input-Output (RRIO) Low Input Bias Current Op Amps

Device is no longer available or supported, and production has been discontinued.

Product Status: EOL

OVERVIEW

The ISL28158 and ISL28258 are micro-power precision operational amplifiers optimized for single supply operation at 5.5V and can operate down to 2.4V.

These devices feature an Input Range Enhancement Circuit (IREC), which enables them to maintain CMRR performance for input voltages greater than the positive supply. The input signal is capable of swinging 0.25V above the positive supply and to 100mV below the negative supply with only a slight degradation of the CMRR performance. The output operation is rail-to-rail.

The ISL28158 and ISL28258 draw minimal supply current while meeting excellent DC-accuracy noise and output drive specifications. Competing devices seriously degrade these parameters to achieve micro-power supply current. Offset current, voltage and current noise, slew rate, and gain bandwidth product are all two to ten times better than on previous micro-power op amps.

The 1/f corner of the voltage noise spectrum is at 100Hz. This results in low frequency noise performance, which can only be found on devices with an order of magnitude higher supply current.

ISL28158 and ISL28258 can be operated from one lithium cell or two Ni-Cd batteries. The input range includes both positive and negative rail. The output swings to both rails.

KEY FEATURES

  • 34µA typical supply current (ISL28158)
  • 68µA typical supply current (ISL28258)
  • 300µV maximum offset voltage (8 Ld SOIC)
  • 1pA typical input bias current
  • 200kHz gain bandwidth product
  • 2.4V to 5.5V single supply voltage range
  • Rail-to-rail input and output
  • Enable pin (ISL28158 only)
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL28158
Basic Information
Production Status
EOL
iSim Model
YES
# of Devices/ Channels
1
Bandwidth (MHz)
0.2
Slew Rate (V/μs)
0.1
VS (min)
2.4 V
VS (max)
5.5 V
IS (per amp)
0.034 mA
Noise VN (nV/√Hz)
64
IBIAS
1 pA
IBIAS (max)
30 pA
Max Offset Voltage
0.55 mV
IOUT
25 mA
VOUT (V)
4.99
Rail-to-Rail Input
Yes
Rail-to-Rail Output
Yes
PSRR (dB)
98
CMRR (dB)
98
Thermal Shutdown
No
Gain Min
1
AVOL (dB)
107
Enable
Yes
Topology
VFA
Qualification Level
Standard
Temperature Range
-40 to +125

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