STEVAL-CCA018V1 STMicroelectronics, STEVAL-CCA018V1 Datasheet - Page 20

• Manufacturer Part Number: STEVAL-CCA018V1
• Description: EVAL BOARD A/D TS4657
• Manufacturer: STMicroelectronics
• Type: Other Power Managementr

Specifications of STEVAL-CCA018V1

• Design Resources: STEVAL-CCA018V1 BOM STEVAL-CCA018V1 Schematic
• Featured Product: STM32 Cortex-M3 Companion Products
• Main Purpose: Audio, Audio Processing
• Embedded: No
• Utilized Ic / Part: TS4657
• Primary Attributes: I²S, Right- or Left- Justified
• Secondary Attributes: 3 V ~ 5.5 V Supply
• Interface Type: I2C
• Operating Supply Voltage: 3 V to 5.5 V
• Product: Power Management Development Tools
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: TS4657
• Other names: 497-10735

Application information
4.2
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Figure 50. Audio interface formats managed by the TS4657
Power-management unit
The TS4657 utilizes a power-management unit to supply its internal structures.
A self-generated negative supply enables the drivers to be powered from positive and
negative supplies, therefore increasing the amplitude of the output signal. This internal
negative supply switches at a higher frequency than traditional architectures, derived from
the master clock MCLK. This structure uses an original design that enables one to suppress
the flying or floating capacitors. Therefore, only four small ceramic X5R 10V 1-µF
decoupling capacitors are necessary for VCCA/VCCD and VREGA/VREGD.
Furthermore, the self-generated negative supply allows the amplifier outputs to be centered
around zero, thus the bulky output coupling capacitors can be removed.
LRCLK
LRCLK
SDAT
BCLK
SDAT
BCLK
LRCLK
SDAT
BCLK
LRCLK
SDAT
BCLK
Up to 24-bit I²S data format: pin FORMAT1 = VIH, FORMAT2 = VIH
Up to 24-bit left-justified data format: pin FORMAT1 = VIL, FORMAT2 = VIH
16-bit Right justified data format: pin FORMAT1 = VIL, FORMAT2 = VIL
24-bit right-justified data format: pin FORMAT1 = VIH, FORMAT2 = VIL
MSB
0
MSB
1
0
1
MSB
MSB
0
0
n-bit word left data
32-bit word left data
1
1
LEFT
LEFT
LEFT
LEFT
16
n-bit word left data
-bit word left data
n-2
n-2
LSB
LSB
n-1
n-1
14
n-2
LSB
LSB
n-1
15
MSB
0
MSB
1
0
1
MSB
MSB
0
n-bit word right data
32-bit word right data
0
1
1
RIGHT
RIGHT
RIGHT
RIGHT
16-bit word right data
n-bit word right data
n-2
n-2
LSB
LSB
n-1
n-1
14
n-2
LSB
LSB
n-1
15
TS4657