WM8734SEFL Wolfson Microelectronics, WM8734SEFL Datasheet - Page 30

• Manufacturer Part Number: WM8734SEFL
• Description: Audio CODECs Stereo CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8734SEFL

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-28
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8734
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The exact sample rates achieved are defined by the relationships in Table 11 below.
128/192fs NORMAL MODE
The Normal Mode sample rates are designed for standard 256fs and 384fs MCLK rates. However the
WM8734 is also capable of being clocked from a 128 or 192fs MCLK for application over limited
sampling rates as shown in the table below.
Table 12 128fs Normal Mode Sample Rate Look-up Table
512/768fs NORMAL MODE
512 fs and 768 fs MCLK rates can be accommodated by using the CLKIDIV2 bit. The core clock to
the DSP will be divided by 2 so an external 512/768 MCLK will become 256/384 fs internally and the
device otherwise operates as in Table 8 but with MCLK at twice the specified rate. See Table 6 for
software control.
Table 11 Normal Mode Actual Sample Rates
SAMPLING
ADC
44.1
kHz
TARGET
48
SAMPLING
RATE
kHz
44.1
88.2
32
48
96
RATE
8
DAC
44.1
kHz
48
(12.288MHz/256) x 1/6
(12.288MHz/256) x 2/3
(12.288MHz/256) x 2
MCLK=12.288
not available
not available
12.288MHz/256
FREQUENCY
kHz
5.6448
8.4672
32
48
96
MCLK
6.144
9.216
8
MHz
BOSR=0
BOSR
(11.2896MHz/256) x 2/11
(11.2896MHz/384) x 2
MCLK=11.2896
0
1
0
1
not available
11.2896MHz/256
not available
not available
8.018
44.1
88.2
kHz
ACTUAL SAMPLING RATE
SR3
REGISTER SETTINGS
0
0
1
1
SAMPLE
RATE
SR2
1
1
1
1
(18.432MHz/384) x 1/6
(18.432MHz/384)x 2/3
(18.432MHz/384) x 2
MCLK=18.432
not available
not available
18.432MHz/384
SR1
kHz
32
48
96
1
1
1
1
8
PD, Rev 4.3, January 2009
BOSR=1
SR0
1
1
1
1
Production Data
(16.9344MHz/384) x 2/11
(16.9344MHz /384) x 2
MCLK=16.9344
16.9344MHz /384
not available
not available
not available
DIGITAL
FILTER
TYPE
8.018
44.1
88.2
kHz
2
2
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