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Precision Amplifiers and EMI-Hardened Amplifiers<br />
LMP7721 – 3 fA Input Bias Current Precision Amplifier<br />
Features<br />
• Input bias current (V CM = 1V)<br />
˚ ±20 fA at 25°C (max)<br />
˚ ±900 fA at 85°C (max)<br />
• 6.5 nV/√Hz input voltage noise, f = 1 kHz<br />
• Supply current 1.3 mA<br />
• Gain bandwidth: 17 MHz<br />
• Slew rate (falling edge) 12.76 V/μs<br />
• Supply voltage 1.8V to 5.5V<br />
• Available in SOIC-8 packaging<br />
pH ELECTRODE<br />
TRIAX<br />
LMP7721 as pH Electrode Amplifier<br />
RF<br />
V +<br />
0.1 µF<br />
R G<br />
-<br />
LMP7721<br />
VOUT<br />
+<br />
V - 0.1 µF<br />
0.1 µF<br />
+<br />
100Ω<br />
LMP7715<br />
-<br />
0.1 µF<br />
Applications<br />
Ideal for use in photodiode amplifiers, high-impedance sensor amplifiers, ion chamber amplifiers, electrometer amplifiers,<br />
pH electrode amplifiers, and transimpedance amplifiers<br />
Read the Application Note 1798 : “Designing with Electro-Chemical Sensors”<br />
www.national.com/edge<br />
EMI-Hardened Amplifiers<br />
<strong>Product</strong> ID EMIRR (dB) Channels Supply Voltage (V) Supply Current (mA) Offset Voltage Input Bias Current (pA) Packaging<br />
LMV831/3 2/ 34 E 120 1/2/4 2.7 to 5.5 0.24 1 mV 1 SC-70/MSOP/TSSOP<br />
LMV861/ 62 E, W 110 1/2 2.7 to 5.5 2.25 1 mV 0.1 SC-70/MSOP-8<br />
LMV851/5 2/ 54 E, W 89 1/2/4 2.7 to 5.5 0.4 1 mV 0.1 SC-70/MSOP/TSSOP<br />
LMP2021/ 22<br />
E, W 82 1/2 2.2 to 5.5 1.1 5 μV 25 SOT23-5, SOIC-8, MSOP-8<br />
E Evaluation board W WEBENCH enabled<br />
LMV831/ 32/ 34 – 3 MHz Low-Power CMOS, EMI-Hardened Operational Amplifiers<br />
Features<br />
Unless otherwise noted, typical values at T A = 25°C, V+= 3.3V<br />
• Supply voltage 2.7V to 5.5V<br />
• Supply current (per channel) 240 μA<br />
• Input offset voltage 1 mV max<br />
• Input bias current 1 pA<br />
• GBW 3.3 MHz<br />
• EMIRR at 1.8 GHz 120 dB<br />
• Input noise voltage at 1 kHz 12 nV/√Hz<br />
• Slew rate 2 V/μs<br />
• Output voltage swing rail to rail<br />
• Output current drive 30 mA<br />
• Operating temperature range ambient -40°C to 125°C<br />
Time (0.5s/DIV)<br />
Applications<br />
Ideal for use in photodiode preamps, piezoelectric sensors, portable/battery-powered electronic equipment filters/buffers and<br />
PDAs/phone accessories<br />
50<br />
V OUT (0.5V/DIV)<br />
Typical Op Amp<br />
LMV832
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