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MAX1190 Datasheet(PDF) 15 Page - Maxim Integrated Products |
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MAX1190 Datasheet(HTML) 15 Page - Maxim Integrated Products |
15 / 21 page Using Transformer Coupling An RF transformer (Figure 6) provides an excellent solu- tion to convert a single-ended source signal to a fully dif- ferential signal, required by the MAX1190 for optimum performance. Connecting the center tap of the trans- former to COM provides a VDD/2 DC level shift to the input. Although a 1:1 transformer is shown, a step-up transformer can be selected to reduce the drive require- ments. A reduced signal swing from the input driver, such as an op amp, can also improve the overall distortion. In general, the MAX1190 provides better SFDR and THD with fully differential input signals than single- ended drive, especially for very high input frequencies. In differential input mode, even-order harmonics are lower as both inputs (INA+, INA- and/or INB+, INB-) are balanced, and each of the ADC inputs only requires half the signal swing compared to single-ended mode. Single-Ended AC-Coupled Input Signal Figure 7 shows an AC-coupled, single-ended applica- tion. Amplifiers like the MAX4108 provide high speed, high bandwidth, low noise, and low distortion to main- tain the integrity of the input signal. Buffered External Reference Drives Multiple ADCs Multiple-converter systems based on the MAX1190 are well suited for use with a common reference voltage. The REFIN pin of those converters can be connected directly to an external reference source. A precision bandgap reference like the MAX6062 gen- erates an external DC level of 2.048V (Figure 8), and exhibits a noise voltage density of 150nV/ √Hz. Its output passes through a 1-pole lowpass filter (with 10Hz cutoff frequency) to the MAX4250, which buffers the reference before its output is applied to a second 10Hz lowpass filter. The MAX4250 provides a low offset voltage (for Dual 10-Bit, 120Msps, 3.3V, Low-Power ADC with Internal Reference and Parallel Outputs ______________________________________________________________________________________ 15 MAX1190 T1 N.C. VIN 6 1 5 2 4 3 22pF 22pF 0.1 µF 0.1 µF 2.2 µF 25 Ω 25 Ω MINICIRCUITS TT1–6-KK81 T1 N.C. VIN 6 1 5 2 4 3 22pF 22pF 0.1 µF 0.1 µF 2.2 µF 25 Ω 25 Ω MINICIRCUITS TT1-6-KK81 INA- INA+ INB- INB+ COM Figure 6. Transformer-Coupled Input Drive |
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