PCM3168APAPR datasheet(21/66 Pages) TI

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100

120

140

160

180

200

2.0

NormalizedFrequency(f )

0.5

1.0

1.5

DSM_Dual

DSM_Single

DF_Single

DF_Dual

100

120

140

160

180

200

2.0

NormalizedFrequency(f )

0.5

1.0

1.5

DSM_Dual

DSM_Single

DSM_Quad

DF_Dual

DF_Single

DF_Quad

PCM3168A

PCM3168A-Q1

www.ti.com ......................................................................................................................................................................................... SBAS452 – SEPTEMBER 2008

oversampling frequency of x64; this mode is supported for sampling frequencies less than 100 kHz. In quad rate

mode, the DAC operates at an oversampling frequency of x32. The sampling mode is automatically selected

according to the ratio of system clock frequency and sampling frequency by default (for example, single rate for

512 fS and 768 fS, dual rate for 256 fS and 384 fS, and quad rate for 128 fS and 192 fS), but manual selection is

also possible for specified combinations through the serial mode control resistor.

Table 5 and Figure 31 show the relation between the oversampling rate (OSR) of the

ΔΣ modulator, noise-free

shaped bandwidth, and each sampling mode setting for ADC operation. Table 6 and Figure 32 describe the

relation between the oversampling rate of the digital filter and

ΔΣ modulator, noise-free shaped bandwidth, and

each sampling mode setting for DAC operation.

Table 5. ADC Modulator OSR and Noise-Free Shaped Bandwidthfor Each Sampling Mode

NOISE-FREE SHAPED BANDWIDTH (kHz)

SAMPLING MODE

SYSTEM CLOCK RATE

(fS)

fS = 48 kHz

fS = 96 kHz

MODULATOR OSR

512, 768

N/A

x128

Auto

256, 384

x64

512, 768

N/A

x128

Single

256, 384

N/A

x128

Dual

256, 384

x64

Table 6. DAC Digital Filter OSR, Modulator OSR, and Noise-Free Shaped Bandwidth

for Each Sampling Mode

NOISE-FREE SHAPED

BANDWIDTH

SAMPLING MODE

SYSTEM CLOCK

fS = 48

fS = 96

fS = 192

RATE (fS)

kHz

DIGITAL FILTER OSR

MODULATOR OSR

512, 768

N/A

x128

Auto

256, 384

N/A

x64

128, 192(1)(2)

x32

512, 768

N/A

x128

Single

256, 384

N/A

x128

128, 192(1)(2)

N/A

x64

256, 384

N/A

x64

Dual

128, 192(1)(2)

N/A

x64

Quad

128, 192(1)(2)

x32

(1)

Supported only by DAC operation.

(2)

Quad mode filter characteristic is applied.

Figure 31. ADC

ΔΣ Modulator and Digital Filter

Figure 32. DAC

ΔΣ Modulator and Digital Filter

Characteristic

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