MSM7731-02 datasheet(31/53 Pages) OKI

Part #	MSM7731-02

Description	Dual Echo Canceler & Noise Canceler with Dual Codec for Hands-Free

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Manufacturer	OKI [OKI electronic componets]

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FEDL7731-02-04

1Semiconductor

MSM7731-02

31/53

(4) CR3 (Transmit Gain Adjustment)

B7

B6

B5

B4

B3

B2

B1

B0

CR3

—

TPAD6

TPAD5

TPAD4

TPAD3

TPAD2

TPAD1

Initial Value

0

B7, B6

Reserved bits.

Modification of initial values is inhibited.

B5, B4, B3, B2, B1, B0

Transmit side level setting (TPAD)

These bits adjust the transmit signal gain and set the mute level. Notice that only the mute level setting

differs from pin control. Because data is read by these bits in synchronization with the rising edge of the

SYNC signal, hold the data in these bits for 250

µs or longer.

When using this register, set the TPAD4, 3, 2, 1 pins to a logic “0”.

(0, 0, 1, 0, 1, 0):

30 dB

(0, 0, 1, 0, 0, 1):

27 dB

(0, 0, 1, 0, 0, 0):

24 dB

(0, 0, 0, 1, 1, 1):

21 dB

(0, 0, 0, 1, 1, 0):

18 dB

(0, 0, 0, 1, 0, 1):

15 dB

(0, 0, 0, 1, 0, 0):

12 dB

(0, 0, 0, 0, 1, 1):

9 dB

(0, 0, 0, 0, 1, 0):

6 dB

(0, 0, 0, 0, 0, 1):

3 dB

(0, 0, 0, 0, 0, 0):

0 dB

(1, 1, 1, 1, 1, 1):

–3 dB

(1, 1, 1, 1, 1, 0):

–6 dB

(1, 1, 1, 1, 0, 1):

–9 dB

(1, 1, 1, 1, 0, 0):

–12 dB

(1, 1, 1, 0, 1, 1):

–15 dB

(1, 1, 1, 0, 1, 0):

–18 dB

(1, 1, 1, 0, 0, 1):

–21 dB

(1, 1, 1, 0, 0, 0):

–24 dB

(1, 1, 0, 1, 1, 1):

–27 dB

(1, 1, 0, 1, 1, 0):

–30 dB

(1, 1, 0, 1, 0, 1):

–33 dB

(1, 1, 0, 1, 0, 0):

–36 dB

(1, 1, 0, 0, 1, 1):

–39 dB

(1, 1, 0, 0, 1, 0):

–42 dB

(1, 1, 0, 0, 0, 1):

–45 dB

(1, 1, 0, 0, 0, 0):

–48 dB

(1, 0, 1, 1, 1, 1):

–51 dB

(1, 0, 1, 1, 1, 0):

–54 dB

(1, 0, 1, 1, 0, 1):

–57 dB

(1, 0, 1, 1, 0, 0):

–60 dB

(1, 0, 1, 0, 1, 1):

MUTE

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