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TLV320AIC3120 Datasheet(PDF) 62 Page - Texas Instruments |
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TLV320AIC3120 Datasheet(HTML) 62 Page - Texas Instruments |
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62 / 160 page  62 TLV320AIC3120 SLAS653B – FEBRUARY 2010 – REVISED AUGUST 2016 www.ti.com Submit Documentation Feedback Product Folder Links: TLV320AIC3120 Detailed Description Copyright © 2010–2016, Texas Instruments Incorporated 7.3.12.12 Analog Outputs Various analog routings are supported for playback. All the options can be conveniently viewed on the functional block diagram, . 7.3.12.12.1 Headphone Drivers The TLV320AIC3120 device features a mono headphone driver (HPOUT) that delivers up to 30 mW per channel, at 3.3-V supply voltage, into a 16- Ω load. The headphones are used in a single-ended configuration where an ac-coupling capacitor (dc-blocking) is connected between the device output pins and the headphones. The headphone driver also supports 32- Ω and 10-kΩ loads without changing any control register settings. The headphone drivers can be configured to optimize the power consumption in the lineout-drive mode by writing 11 to page 1 / register 44, bits D2–D1. The output common mode of the headphone and lineout drivers is programmed to 1.35 V, 1.5 V, 1.65 V, or 1.8 V by setting page 1 / register 31, bits D4–D3. Set the common-mode voltage to ≤ AVDD / 2. The headphone driver can be powered on by writing to page 1 / register 31, bit D7. The HPOUT output driver gain can be controlled by writing to page 1 / register 40, bits D6–D3, and it can be muted by writing to page 1 / register 40, bit D2. The TLV320AIC3120 device has a short-circuit protection feature for the headphone drivers, which is always enabled to provide protection. The output condition of the headphone driver during short circuit is programmed by writing to page 1 / register 31, bit D1. If D1 = 0 when a short circuit is detected, the device limits the maximum current to the load. If D1 = 1 when a short circuit is detected, the device powers down the output driver. The default condition for headphones is the current-limiting mode. In case of a short circuit on either channel, the output is disabled and a status flag is provided as read-only bits on page 1 / register 31, bit D0. If shutdown mode is enabled, then as soon as the short circuit is detected, page 1 / register 31, bit D7 (for HPOUT) clears automatically. Next, the device requires a reset to re-enable the output stage. Resetting occurs in two ways. First, the device master reset can be used, which requires either toggling the RESET pin or using the software reset. If master reset is used, it resets all of the registers. Second, a dedicated headphone power-stage reset can also be used to re-enable the output stage, and that keeps all of the other device settings. The headphone power stage reset occurs by setting page 1 / register 31, bit D7 for HPOUT. If the fault condition has been removed, then the device returns to normal operation. If the fault is still present, then another shutdown occurs. Repeated resetting (more than three times) is not recommended, as this could lead to overheating. 7.3.12.12.2 Speaker Drivers The TLV320AIC3120 device has an integrated class-D mono speaker driver (SPKP / SPKM) capable of driving an 8-Ω or 4-Ω differential load. The speaker driver can be powered directly from the battery supply (2.7 V to 5.5 V) on the SPKVDD pins; however, the voltage (including spike voltage) must be limited below the absolute-maximum voltage of 6 V. The speaker driver is capable of supplying 400 mW per channel with a 3.6-V power supply. Through the use of digital mixing, the device can connect one or both digital audio playback data channels to either speaker driver; this also allows digital channel swapping if needed. The class-D speaker driver can be powered on by writing to page 1 / register 32, bit D7. The class-D output driver gain can be controlled by writing to page 1 / register 42, bits D4–D3, and it can be muted by writing to page 1 / register 42, bit D2. The TLV320AIC3120 device has a short-circuit protection feature for the speaker drivers that is always enabled to provide protection. If the output is shorted, the output stage shuts down on the overcurrent condition. (Current limiting is not an available option for the higher-current speaker driver output stage.) In case of a short circuit on either channel, the output is disabled and a status flag is provided as a read-only bit on page 1 / register 32, bit D0. |
Similar Part No. - TLV320AIC3120_16 |
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