描述
The LTA37 provides the same high performance, but the design is optimized for circuits with gains greater than five. This design change increases slew rate to 17V/µs and gain-bandwidth product to 82 MHz. The LTA37 provides the low offset and drift of the OP27 plus higher speed and lower noise. Offsets down to 50µV and a maximum drift of 0.5µV/℃ make the LTA37 ideal for precision instrumentation applications. Exceptionally low noise (en=3nV/√Hz @1kHz), a low 1/f noise corner frequency of 5 Hz, and the high gain of 5.6 million, allow accurate high-gain amplification of low-level signals.
The low input bias current of 50nA and offset current of 40nA are achieved by using a bias-current cancellation circuit. The output stage has good load driving capability. A guaranteed swing of 10 V into 600Ω and low output distortion make the LTA37 an excellent choice for professional audio applications. PSRR 130 dB and CMRR 135 dB allow the circuit designer to achieve performance levels previously attained only by discrete designs.
Low-cost, high-volume production of the LTA37 is achieved by using trimming circuit. This reliable and stable offset trimming scheme has proved its effectiveness over many years of production history. The LTA37 brings low-noise instrumentation-type performance to such diverse applications as microphone, tape-head, and RIAA phono preamplifiers, high-speed signal conditioning for data acquisition systems, and wide-bandwidth instrumentation.
LTA37 (single) is available in both SOIC-8, MSOP-8, and TSSOP-8 packages. The LTA237 (dual) is offered in SOIC-8 and
SOIC-16 packages.
优势和特点
Low Noise, 0.2 µVP-P (0.1 Hz to 10 Hz)
3nV/√Hz @1kHz
Low Drift, 0.5µV/℃
High Speed, 17 V/µs Slew Rate
82 MHz Gain Bandwidth
Low Input Offset Voltage, 50µV
Excellent CMRR, 135 dB (Common-Voltage @ ±11 V)
High Open-Loop Gain, 5.6 Million (135 dB)
Nulling pin for further adjustment of Vos (Only for LTA37J series)
Replaces OP27, OP37, OPA227, OPA228 SE5534, OP-200 In Gains > 5
应用
Precision Instrumentation
Test Equipment
Data Acquisition
Professional Audio Equipment
Motor Phase Current Sense
Transducer Amplifier
