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THAT1243 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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THAT1243 Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
6 / 8 page THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Tel: +1 (508) 478-9200; Fax: +1 (508) 478-0990; Web: www.thatcorp.com Page 6 Balanced Line Receiver ICs Preliminary Information en line receiver kHz nV Hz dBu == - ´ 10 0775 20 130 20 173 () , . The noise of the 249 W resistor is 2.05 nV/ÖHz. We can assume that the noise contribution of R8 and R19 will be negligible, and therefore, the total noise density going into the input of the ADC will be entotal nV Hz nV Hz nV Hz =+ = (. ) ( . ) . 173 2 06 2 68 22 The noise floor can then be calculated to be Noise dB dBu kHz nV Hz = é ë ê ê ù û ú ú =- ´ 20 126 2 268 20 0775 log . . . u Figure 7 shows an excellent method for control- ling gain in a balanced system. There is often a temptation in these systems to keep the signal bal- anced and use two VCAs to independently control the gain on each half of the balanced signal. Unfortu- nately, this can results in common mode to differen- tial mode conversion (degradation of CMRR) when there are even slight differences in gain between the VCAs. A better approach is to convert the signal to single-ended, alter the gain, and then convert back to balanced. In Figure 7 we use a THAT 1243 -3 dB line re- ceiver to do the balanced to single-ended conversion. The VCA section also has a static gain of -3 dB due to the ratio of R2 and R3. This circuit can accept 24 dBu, since the THAT 1243 output stage is capable of 21 dBu without distortion. Reducing R3 to 14 k W results in a 3 dB reduction in VCA output noise. This arrangement results in 3 dB greater dynamic range compared to the case where a -6 dB line re- ceiver and a VCA with zero dB static gain are used. After the VCA, the signal is restored to 24 dBu by the THAT 1430. |
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