DRV134 Datasheet, PDF (17/30 Pages) Burr-Brown (TI) – AUDIO BALANCED LINE DRIVERS

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DRV134, DRV135
SBOS094B – JANUARY 1998 – REVISED DECEMBER 2014
Typical Application (continued)
9.2.1.3 Application Curve
Figure 31 shows the performance obtained with the system depicted in Figure 30.
0.01
See Figure 3 for Test Circuit
A: R₁ = R₂ = R_L = ∞ (no load)
B: R₁ = R₂ = 600Ω, R_L = ∞
C: R₁ = R₂ = ∞, R _L = 600Ω
0.001
Differential Mode
V_O = 10Vrms
500 ft cable
A
B
C
DRV134 Output
0.0001
20
100
1k
10k 20k
Frequency (Hz)
Figure 31. Measured Performance of a System Based on DRV134
10 Power Supply Recommendations
The DRV134 and DRV135 are designed to operate from an input voltage supply range between ±4.5 V and ±18
V. This input supply should be well regulated. If the input supply is located more than a few inches from the
DRV134 or DRV135 additional bulk capacitance may be required in addition to the ceramic bypass capacitors.
11 Layout
11.1 Layout Guidelines
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 bypassing (as shown in Figure 32 and Figure 33), 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 applications. Physical balance in signal wiring should be
maintained. Capacitive differences due to varying wire lengths may result in unequal noise pickup between
the pair and degrade OCMR. Follow industry practices for proper system grounding of the cables.
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