LTC2058 TYPICAL APPLICATIONSParalleling Choppers to Improve Noise + R5 1/2 LTC2058 – R2 R1 + R5 1/2 LTC2058 – R2 R2 AV = +1 R4 • +1 V R1 R3 IN + R1 LTC2057 VOUT – 8 R4 + R5 1/2 LTC2058 R3 – R2 R1 + R5 1/2 LTC2058 – R2 2058 TA04 R1 DC TO 10Hz NOISE = 200nVP-P , e 9nV/√Hz n = , in = √N • 1pA/√Hz, IB < N • 100pA (MAX) √N √N WHERE N IS THE NUMBER OF PARALLELED INPUT AMPLIFIERS. FOR N = 4, DC TO 10Hz NOISE = 100nVP-P, en = 4.5nV/√Hz, in = 2pA/√Hz, IB < 100pA (MAX). R5 SHOULD BE A FEW HUNDRED OHMS TO ISOLATE AMPLIFIER OUTPUTS WITHOUT CONTRIBUTING SIGNIFICANTLY TO NOISE OR IB-INDUCED ERROR. R2 +1 >> √N FOR OUTPUT AMPLIFIER NOISE TO BE INSIGNIFICANT. R1 Rev 0 For more information www.analog.com 23 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagrams Applications Information Typical Applications Package Description Typical Application Related Parts
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