TAS5729MD datasheet(28/59 Pages) TI1

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(1or0)

2 +

(1or0)

2 +(1or0)

+.......(1or0)

–1

–4

–23

2 Bit

Bit

–1

Bit

–4

Bit

–23

M0126-01

Bit

–23

S_xx.xxxx_xxxx_xxxx_xxxx_xxxx_xxx

Bit

–5

Bit

–1

2 Bit

SignBit

2 Bit

M0125-01

B0396-01

1 – a

rms

ABS

Ch1

–1

Post-DAP Processing

32-BitLevel

I CRegisters

(PWMLevelMeter)

rms

ABS

Ch2

–1

32-BitLevel

ADDR=0x6C

ADDR=0x6B

1 – a

TAS5729MD

SLOS836A – MAY 2013 – REVISED JUNE 2013

www.ti.com

PWM LEVEL METER

The structure in Figure 47 shows the PWM level meter that can be used to study the power profile.

Figure 47. PWM Level Meter Structure

26-Bit 3.23 Number Format

All mixer gain coefficients are 26-bit coefficients using a 3.23 number format. Numbers formatted as 3.23

numbers means that there are 3 bits to the left of the binary point and 23 bits to the right of the binary point. This

is shown in Figure 48 .

Figure 48. 3.23 Format

The decimal value of a 3.23 format number can be found by following the weighting shown in Figure 48. If the

most significant bit is logic 0, the number is a positive number, and the weighting shown yields the correct

number. If the most significant bit is a logic 1, then the number is a negative number. In this case every bit must

be inverted, a 1 added to the result, and then the weighting shown in Figure 49 applied to obtain the magnitude

of the negative number.

Figure 49. Conversion Weighting Factors—3.23 Format to Floating Point

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