IC DGTL AUDIO PWM PROC 64-TQFP

TAS5508APAG

Manufacturer Part NumberTAS5508APAG
DescriptionIC DGTL AUDIO PWM PROC 64-TQFP
ManufacturerTexas Instruments
TypePWM Processor
TAS5508APAG datasheet
 


Specifications of TAS5508APAG

ApplicationsDVDMounting TypeSurface Mount
Package / Case64-TQFP, 64-VQFPFor Use WithTAS5342DDV6EVM - TAS5342DDV6EVMTAS5508-5142K7EVM - EVAL MODULE FOR TAS5508B/TAS5142TAS5508-5122C6EVM - EVAL MODULE FOR TAS5508B/TAS5122TAS5508-5121K8EVM - EVAL MODULE FOR TAS5508B/TAS5121
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther names296-17475
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TAS5508A
8-Channel Digital Audio PWM Processor
SLES119A – FEBRUARY 2004 – REVISED JULY 2009
concatenated with the hex value of the fractional part of the gain coefficient to form the 32-bit I
coefficient. The reason is that the 28-bit coefficient contains 5 bits of integer, and thus the integer part of
the coefficient occupies all of one hex digit and the most significant bit of the second hex digit. In the same
way, the fractional part occupies the lower three bits of the second hex digit, and then occupies the other
five hex digits (with the eighth digit being the zero-valued most significant hex digit).
2.3.2.2 48-Bit 25.23 Number Format
All level adjustment and threshold coefficients are 48-bit coefficients using a 25.23 number format.
Numbers formatted as 25.23 numbers have 25 bits to the left of the decimal point and 23 bits to the right
of the decimal point. This is shown in
−23
2
Bit
−10
2
Bit
−1
2
Bit
0
2
Bit
16
2
Bit
22
2
Bit
23
2
Bit
Sign Bit
Figure 2-8
shows the derivation of the decimal value of a 48-bit 25.23 format number.
23
2
Bit
23
(1 or 0) y 2
+ (1 or 0) y 2
Figure 2-8. Alignment of 5.23 Coefficient in 32-Bit I
Two 32-bit words must be sent over the I
TAS5508A. The alignment of the 48-bit, 25.23 formatted coefficient in the 8-byte (two 32-bit words) I
word is shown in
Figure
2-9.
26
Description
Figure
2-7.
S_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx.xxxx_xxxx_xxxx_xxxx_xxxx_xxx
Figure 2-7. 25.23 Format
22
0
−1
2
Bit
2
Bit
2
Bit
22
0
+
+ (1 or 0) y 2
+ (1 or 0) y 2
2
C bus to download a level or threshold coefficient into the
M0007-02
−23
2
Bit
−1
−23
+
+ (1 or 0) y 2
M0008-02
2
C Word
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2
C
2
C