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参数资料
| 型号： | MAS9090BJ |
| 厂商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分类： | 编解码器 |
| 英文描述： | LOW VOLTAGE 14-BIT LINEAR CODEC |
| 中文描述： | LINEAR CODEC, PQFP44 |
| 封装： | TQFP-44 |
| 文件页数： | 25/30页 |
| 文件大小： | 459K |
| 代理商： | MAS9090BJ |
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DA9090B.001
January 14, 1998
25
REGISTER DESCRIPTION
Control Register CR4
Transmit Input Selection
Bits VS (7) and TE (6) select active input (MIC1,
MIC2 or MIC3). Default is that all inputs are muted.
Transmit (TX) gain can be adjusted from 0 to 22.5
dB in 1.5 dB steps with register CR5 bits (7:4).
Sidetone Selection
Transmit signal after bandpass filter can be fed
back to the receive amplifiers when bit SI (5) is set
high.
Output Driver Selection
Bits OE1 (4) and OE2 (3) select the active output of
the RX gain to be SP1 or SP2. Both outputs can be
muted.
Ring/Tone Signal Selection
Bit RTE (2) connects the on-chip Ring/Tone
generator to the RX gain input.
Receive High Pass Filter Selection
Bit HPR (1) provides possibility to bypass high pass
section of the receive bandpass filter.
PCM receive data selection
Bit SE (0) enables the connection of the received
signal to the RX gain input.
Control Register CR5
Transmit Gain Selection
TX gain can be programmed from 0 to 22.5 dB in
1.5 dB steps with bits (7:4).
Sidetone Attenuation Selection
Transmit signal picked after digital bandpass filters
can be fed back to RX gain. Attenuation of the
sidetone signal can be programmed from –12.5 dB
to –27.5 dB in 1 dB steps with bits (7:4). Attenuation
is relative to the input signal level of bandpass filter.
Control Register CR6
Speaker 1 and 2 Gain Selection
The attenuation of both speaker gains can be
programmed separately from 0 to –30 dB in 2 dB
steps with bits (7:4) and (3:0).
0 dBm0 voltage at the output of the RX gain on pins
SP1/2+ and SP1/2- is 1.965 Vrms when 0 dB gain is
selected. When –30 dB gain is selected the
0 dBm0 level is 61.85 mVrms.
Control Register CR7
Tone/Ring Gain Selection
Output of Tone/Ring generator can be attenuated
from 0 to –27 dB in 3 dB steps with bits (7:4).
Frequency Mode Selection
Bits f1 (3) and f2 (2) permit selection of f1 and/or f2
frequency generators. When f1 (f2) is selected the
output of the tone generator is signal at the
frequency programmed by the register CR8 (CR9).
If both f1 and f2 are selected the output is a sum of
both signals. In case of squarewave the f1 is
amplitude modulated by f2. In order to meet DTMF
specifications the level of f2 is attenuated by 2 dB
relative to f1.
Waveform Selection
Bit SN (1) selects the output waveform of the tone
generator to be square (SN=0) or sinewave (SN=1).
DTMF Selection
Bit DE (0) permits the connection of the tone
generator to the transmit path. Speaker output can
also be provided by using sidetone circuit (bit SI of
CR4) or directly connecting the tone generator to
RX gain with bit RTE of CR4.
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| MAS9090BJ-T | 制造商:MICRONAS 制造商全称:MICRONAS 功能描述:LOW VOLTAGE 14-BIT LINEAR CODEC |
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