OPA GX4551 for Active Filters, THS4551/THS4552 Compatible

Active filters, which are filters consisting of RC elements and operational amplifiers, function to allow signals within a certain frequency range to pass through and to suppress or sharply attenuate signals outside this frequency range. The instrument‘s main device amplifier, with its high gain, high input impedance, and low output impedance, can enhance the filter‘s filtering performance, realize a variety of filtering functions, and also enhance circuit stability.

The GXSC GX4551 is a single/dual-channel, low-noise, high-precision, 150MHz fully differential amplifier for differential active filter applications, featuring rail-to-rail output and wide output common mode control. It can also be used with a variety of high-precision analog-to-digital converters to provide excellent signal-to-noise ratio (SNR) and spurious-free dynamic range (SFDR).

With its negative rail input (NRI) feature, it can be used to connect a DC-coupled, ground-centered source signal to a single-supply differential input ADC. ultra-low DC error and drift performance meets the input requirements of 16- to 20-bit successive approximation registers (SARs). Wide-range output common-mode control supports 1.8V to 5V supply-supplied ADCs and meets ADC common-mode input requirements from 0.7V to over 3.0V. Its main performance is as follows: 

- Bandwidth: 150MHz (G=1V/V) 

- Differential output slew rate: 210V/µs

- Gain bandwidth product: 135MHz

- Negative supply rail input (NRI) 

- Rail-to-rail output (RRO) 

- Wide output common-mode control range 

- Single-supply operating voltage range: 2.7V to 5.5V

- Supply power consumption: 7.8mA/CH(5V) 

- 25°C input offset voltage: ±100µV (typical) 

- Input Offset Voltage Temperature Drift: ±1.0µV/°C (Typ) 

- Differential input voltage noise: 4.1nV/√Hz

- 2nd harmonic: -120dBc@2VPP, 100kHz

- 3rd harmonic: -123dBc@2VPP, 100kHz

- 4V step, accuracy to 0.01% build-up time less than 150nS 

- 18-bit build-up time: 4V step, less than 600ns

- Pin to Pin compatible with THS4551/THS4552, can replace ADA4940