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AS1703-T Datasheet(PDF) 11 Page - ams AG |
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AS1703-T Datasheet(HTML) 11 Page - ams AG |
11 / 20 page www.austriamicrosystems.com Revision 1.47 11 - 20 AS1702 - AS1705 Data Sheet - Deta iled Description 8 Detailed Description The AS1702 - AS1705 are 1.8W high output-current audio amplifiers (configured as BTL amplifiers), and contain inte- grated low-power shutdown and click- and pop-suppression circuitry. Two inputs (SHDM and SHDN) allow shutdown mode to be configured as active-high or active-low (see Shutdown Mode on page 11). Each device has either adjustable or fixed gains (0dB, 3dB, 6dB) (see Ordering Information on page 19). Bias The devices operate from a single 2.7 to 5.5V supply and contain an internally generated, common-mode bias voltage of: referenced to ground. Bias provides click-and-pop suppression and sets the DC bias level for the audio outputs. Select the value of the bias bypass capacitor as described in Section BIAS Capacitor on page 15. Note: Do not connect external loads to BIAS as this can adversely affect overall device performance. Shutdown Mode All devices implement a 100nA, low-power shutdown circuit which reduces quiescent current consumption. As shut- down mode commences, the bias circuitry is automatically disabled, the device outputs go high impedance, and bias is driven to GND. The SHDM input controls the polarity of SHDN: ! Drive SHDM high for an active-low SHDN input. ! Drive SHDM low for an active-high SHDN input. Click-and-Pop Suppression During power-up, the device common-mode bias voltage (VBIAS (see page 4)) ramps to the DC bias point. When enter- ing shutdown, the device outputs are driven high impedance to 100k Ω between both outputs minimizing the energy present in the audio band, thus preventing clicks and pops. Table 6. Shutdown Mode Selection Configurations SHDM SHDN Mode 0 0 Shutdown Mode Enabled 0 1 Normal Operation Enabled 1 0 Normal Operation Enabled 1 1 Shutdown Mode Enabled 2 (EQ 1) VCC |
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