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AS1701 Datasheet(PDF) 11 Page - ams AG |
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AS1701 Datasheet(HTML) 11 Page - ams AG |
11 / 17 page www.austriamicrosystems.com Revision 1.52 11 - 17 AS1701, AS1706 Data Sheet - Ap p lica tio n In fo r m a tio n 9 Application Information BTL Amplifier The AS1701/AS1706 are designed to drive loads differentially in a bridge-tied load (BTL) configuration. Figure 30. Bridge-Tied Load Configuration Driving the load differentially doubles the output voltage (illustrated in Figure 30) compared to a single-ended amplifier under similar conditions. Thus, the differential gain of the device is twice the closed-loop gain of the input amplifier. The effective gain is calculated by: Substituting 2 x VOUT(P-P) into (EQ 3) and (EQ 4) yields four times the output power due to doubling of the output volt- age. Since the differential outputs are biased at mid-supply, there is no net DC voltage across the load, eliminating the need for the large, expensive, performance degrading DC-blocking capacitors required by single-ended amplifiers. Power Dissipation and Heat Sinking Normally, the devices dissipate a significant amount of power. The maximum power dissipation is given in Table 2 as Continuous Power Dissipation, or it can be calculated by: where TJ(MAX) is +150°C, TAMB (see Table 2) is the ambient temperature, and ΘJA is the reciprocal of the derating fac- tor in °C/W. The increased power delivered by a BTL configuration normally results in increased internal power dissipation versus a single-ended configuration. The maximum internal power dissipation for a given VDD and load is calculated by: +1 -1 VOUT(P-P) VOUT(P-P) 2 x VOUT(P-P) AVD = 2 x RIN (EQ 2) RF VRMS = 2 2 (EQ 3) VOUT(P-P) POUT = RL (EQ 4) VRMS 2 PDISSPKF(MAX) = ΘJA (EQ 5) TJ(MAX) -TA PDISSPKF(MAX) = π2RL (EQ 6) 2VDD 2 |
Similar Part No. - AS1701_1 |
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Similar Description - AS1701_1 |
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