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參數資料
| 型號： | TLV320DAC3100IRHBT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | DAC |
| 英文描述： | DAC WITH PROGRAMMABLE PLL, PQCC32 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件頁數： | 38/97頁 |
| 文件大小： | 1134K |
| 代理商： | TLV320DAC3100IRHBT |
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www.ti.com
SLAS671 – FEBRUARY 2010
5.5.12 Analog Outputs
Various analog routings are supported for playback. All the options can be conveniently viewed on the
functional block diagram, Figure 1-1.
5.5.12.1 Headphone Drivers
The TLV320DAC3100 features a stereo headphone driver (HPL and HPR) that can deliver up to 30 mW
per channel, at 3.3-V supply voltage, into a 16-
load. The headphones are used in a single-ended
configuration where an ac-coupling (dc-blocking) capacitor is connected between the device output pins
and the headphones. The headphone driver also supports 32-
and 10-k 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 0 / register 44, bits D2–D1.
The output common mode of the headphone/lineout drivers can be programmed to 1.35 V, 1.5 V, 1.65 V,
or 1.8 V by setting page 1 / register 31, bits D4–D3. The common-mode voltage should be set
≤ AVDD/2.
The left headphone driver can be powered on by writing to page 1 / register 31, bit D7. The right
headphone driver can be powered on by writing to page 1 / register 31, bit D6. The left-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 right-output driver gain can be controlled by writing to page 1 / register 41,
bits D6–D3, and it can be muted by writing to page 1 / register 41, bit D2.
The TLV320DAC3100 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 can be
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 HPL) and/or page 1 / register 31, bit D6 (for HPR) clears automatically. Next, the
device requires a reset to re-enable the output stage. Resetting can be done 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 is done by setting page 1 / register 31, bit D7 for HPL and by setting page 1 /
register 31, bit D6 for HPR. 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.
5.5.12.2 Speaker Drivers
The TLV320DAC3100 has an integrated class-D mono speaker driver (SPKP/SPKM) capable of driving a
4-
or an 8- 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 2.5 W with a 5.5-V power supply (4-
load). Through the use
of digital mixing, the device can connect one or both digital audio playback data channels to the speaker
driver.
The mono class-D speaker driver can be powered on by writing to page 1 / register 32, bit D7. The mono
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.
Copyright 2010, Texas Instruments Incorporated
APPLICATION INFORMATION
43
Product Folder Link(s): TLV320DAC3100
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