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DRV134 Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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DRV134 Datasheet(HTML) 10 Page - Burr-Brown (TI) |
10 / 10 page 10 ® DRV134, 135 SIGNAL BALANCE RATIO Signal balance ratio (SBR) measures the symmetry of the output signals under loaded conditions. To measure SBR an input signal is applied and the outputs are summed as shown in Figure 5. VOUT should be zero since each output ideally is exactly equal and opposite. However, an error signal results from any imbalance in the outputs. This error is quantified by SBR. The impedances of the DRV134’s out put stages are closely matched by laser trimming to mini- mize SBR errors. In an application, SBR also depends on the balance of the load network. SINGLE-ENDED OPERATION The DRV134 can be operated in single-ended mode without degrading output drive capability. Single-ended operation requires that the unused side of the output pair be grounded (both the VO and Sense pins) to a low impedance return path. Gain remains +6dB. Grounding the negative outputs as shown in Figure 6 results in a noninverted output signal (G = +2) while grounding the positive outputs gives an inverted output signal (G = –2). FIGURE 6. Typical Single-Ended Application. FIGURE 5. Signal Balance Ratio Test Circuit. 600 Ω V OUT = 2VIN V IN V+ V– DRV134 8 1 7 2 G = +6dB 4 5 6 3 For best rejection of line noise and hum differential mode operation is recommended. However, single-ended perfor- mance is adequate for many applications. In general single- ended performance is comparable to differential mode (see THD+N typical performance curves), but the common- mode and noise rejection inherent in balanced-pair systems is lost. CABLE The DRV134 is capable of driving large signals into 600 Ω loads over long cables. Low impedance shielded audio cables such as the standard Belden 8451 or 9452 (or similar) are recommended, especially in applications where long cable lengths are required. THERMAL PERFORMANCE The DRV134 and DRV135 have robust output drive capa- bility and excellent performance over temperature. In most applications there is no significant difference between the DIP, SOL-16, and SO-8 packages. However, for applica- tions with extreme temperature and load conditions, the SOL-16 (DRV134UA) or DIP (DRV134PA) packages are recommended. Under these conditions, such as loads greater than 600 Ω or very long cables, performance may be de- graded in the SO-8 (DRV135UA) package. LAYOUT CONSIDERATIONS A driver/receiver balanced-pair (such as the DRV134 and INA137) rejects the voltage differences between the grounds at each end of the cable, which can be caused by ground currents, supply variations, etc. In addition to proper bypass- ing, the suggestions below should be followed to achieve optimal OCMR and noise rejection. • The DRV134 input should be driven by a low impedance source such as an op amp or buffer. • As is the case for any single-ended system, the source’s common should be connected as close as possible to the DRV134’s ground. Any ground offset errors in the source will degrade system performance. • Symmetry on the outputs should be maintained. • Shielded twisted-pair cable is recommended for all appli- cations. Physical balance in signal wiring should be main- tained. Capacitive differences due to varying wire lengths may result in unequal noise pickup between the pair and degrade OCMR. Follow industry practices for proper sys- tem grounding of the cables. V OUT V IN ( ) 600 Ω 300 Ω(1) 300 Ω(1) V OUT SBR = –20 Log at f = 1kHz V IN = 10Vp-p +V O –V O DRV134 1 µF +18V 6 8 1 7 2 1 µF –18V Gnd 5 4 3 NOTE: (1) Matched to 0.1%. |
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