SLASEM6C October   2017  – October 2020

PRODUCTION DATA

1. Features
2. Applications
3. Description
4. Revision History
5. Pin Configuration and Functions
6. Specifications
7. Parameter Measurement Information
8. Detailed Description
9. Application and Implementation
1. 9.1 Application Information
2. 9.2 Typical Application
1. 9.2.1 Design Requirements
2. 9.2.2 Detailed Design Procedure
3. 9.2.3 Application Curves
3. 9.3 Initialization Set Up
10. 10Power Supply Recommendations
11. 11Layout
12. 12Device and Documentation Support
13. 13Mechanical, Packaging, and Orderable Information

#### Package Options

• RJQ|26
• YFF|30
##### 8.4.3.5.1 TDM Mode

The TAS2770 supports alignment of limiter (including brown out prevention) dynamics across devices that share the same TDM bus. This ensures consistent gain between channels during limiting or brown out events since these dynamics are dependent on audio content, which can vary across channels. Each device can be configured to align to a specified number of other devices, which allows creation of groupings of devices that align only to each other.

Limiter activity is communicated via the limiter gain reduction parameter that can be optionally transmitted by each device on SDOUT in an 8-bit time slot. Gain reduction should be transmitted in adjacent time slots for all devices that are to be aligned beginning with the first slot that is specified by the ICLA_SLOT[5:0] register bits. The order of the devices is not important as long as they are adjacent. The time slot for limiter gain reduction is configured by the GAIN_SLOT[5:0] register bits and enabled by the GAIN_TX register bit.

The ICLA_SEN[7:0] register bits specify which time slots should be listened to for gain alignment. This allows any number of devices between two and eight to be grouped together. At least two of these bits should be enabled for alignment to take place. The ICLA_USE_MAX register bit determines whether alignment is based on the maximum or minimum gain reduction value from the group of enabled devices.

To enable the inter chip limiter alignment feature, the ICLA_EN register bit should be asserted high and all devices should be configured with identical limiter and brown out prevention settings. Limiter gain reduction transmission should be enabled on all devices as described above.

Table 8-63 Inter Chip Limiter Alignment
ICLA_ENValue
0
Disabled (default)
1
Enabled
Table 8-64 ICLA Alignment Configuration
ICLA_MODEValue
00
Use the minimum gain reduction of the ICLA group including 0dB (default)
01
Use the maximum gain reduction of the ICLA group
10
Use the minimum gain reduction of the ICLA group that is non-0dB
11
Reserved
Table 8-65 Inter Chip Limiter Alignment Starting Time Slot
ICLA_SLOT[5:0]Starting Time Slot
0x00
Time Slot 0 (default)
0x01
Time Slot 1
0x02
Time Slot 2
...
...
0x3F
Time Slot 63
Table 8-66 Inter Chip Limiter Alignment Time Slot Enable
Register BitDescriptionBit ValueState
ICLA_SEN[0]Time Slot = ICLA_SLOT[5:0]. When enabled, the limiter will include this time slot in the alignment group.
0
Disabled (default)
1
Enabled
ICLA_SEN[1]Time Slot = ICLA_SLOT[5:0] + 1. When enabled, the limiter will include this time slot in the alignment group.
0
Disabled (default)
1
Enabled
ICLA_SEN[2]Time Slot = ICLA_SLOT[5:0] + 2. When enabled, the limiter will include this time slot in the alignment group.
0
Disabled (default)
1
Enabled
ICLA_SEN[3]Time Slot = ICLA_SLOT[5:0] + 3. When enabled, the limiter will include this time slot in the alignment group.
0
Disabled (default)
1
Enabled
ICLA_SEN[4]Time Slot = ICLA_SLOT[5:0] + 4. When enabled, the limiter will include this time slot in the alignment group.
0
Disabled (default)
1
Enabled
ICLA_SEN[5]Time Slot = ICLA_SLOT[5:0] + 5. When enabled, the limiter will include this time slot in the alignment group.
0
Disabled (default)
1
Enabled
ICLA_SEN[6]Time Slot = ICLA_SLOT[5:0] + 6. When enabled, the limiter will include this time slot in the alignment group.
0
Disabled (default)
1
Enabled
ICLA_SEN[7]Time Slot = ICLA_SLOT[5:0] + 7. When enabled, the limiter will include this time slot in the alignment group.
0
Disabled (default)
1
Enabled