After Sales
Technical Documentation
RAE/RAK–1N
Baseband
Page 2–33
Original, 08/96
Block description
The codec has three microphone inputs and two earphone outputs. The
microphone inputs from handportable and PHF microphones plus the
external audio input can be therefore connected directly to the codec. The
handportable earphone output and external audio are also connected
directly to the codec using the two earphone output channels. The booster
amplifier for PFH uses the same codec output channel as the external
audio. The codec has internal switches for selecting which input or output
is used. It also has microphone amplifier with programmable gain and
earphone attenuator with programmable attenuation. Input/output
selection and amplification/attenuation setting can be done using codec
registers. The registers are controlled by the MCU.
Handportable microphone (MICN, MICP) and PHF microphone
(PHFMICN, PHFMICP) are connected directly to the codec‘s differential
inputs. There is a bias switch in the AUDIO block, which connects the DC
bias voltage for both microphones (electret type) when a call is activated.
The external microphone signal (EXTMIC) is connected single–ended to
the third microphone input channel. There is 21 dB attenuation in the
external microphone line before the codec to prevent clipping.
The handportable’s earphone (EARN, EARP) is connected directly to one
of the two differential output channels. The output can drive directly a 32
load. The external audio signal (EXTEAR) is connected single–ended to
the other output channel. This output is also connected to the input of the
Personal Hands–Free booster amplifier. The booster is disabled by MCU
when an external audio accessory is used. In PHF mode, the booster is
enabled and its differential output is fed to the PHF speaker (PHFEARN,
PHFEARP). The load impedance of the PHF speaker is 8
.
Inside the codec, the currently selected microphone signal is routed to the
microphone amplifier. After that it is fed to the bandpass filter and then to
the A/D converter. After the conversion the digital speech is sent to the
DSP in PCM format.
Digital downlink signal from the DSP is fed to the D/A converted. After the
converter there is low pass filter and attenuator before the earphone
output. All these are inside the codec. The ASIC generates the 512 kHz
and 8 kHz clocks for the codec and data transmission between the codec
and the DSP.
The audio codec communicates with the DSP (digital speech) through an
SIO (signals: PCMIN, SYNC, CODEC_CLK and PCMOUT).The MCU
controls the audio codec function through a separate serial bus (signals:
PCMCDO, PCMCDI, PCMCLK and XSELPCMC). The PHF power
amplifier can be enabled or disabled using the AMP_PWR signal from the
MCU. The power amplifier is enabled only when needed due to power
consumption reasons.
Содержание 9000i
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Страница 113: ...After Sales Technical Documentation RAE RAK 1N Series Original 08 96 Chapter 6 PDA Hardware Module GP1 ...
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Страница 159: ...After Sales Technical Documentation RAE RAK 1N Series Amendment 1 04 97 Chapter 7 Service Software ...
Страница 243: ...After Sales Technical Documentation RAE RAK 1N Series Original 05 97 Chapter 8 Faultfinding Disassembly ...
Страница 287: ...After Sales Technical Documentation RAE RAK 1N Series Original 08 96 Chapter 9 Service Tools ...
Страница 301: ...After Sales Technical Documentation RAE 1N Series Original 04 97 Chapter 10 Schematics ...
Страница 303: ...RAE 1N Original 08 96 10 11 Page 1 Figure 1 Component Layout Bottom ...
Страница 304: ...RAE 1N Original 08 96 10 12 Page Figure 2 Component Layout Top ...
Страница 305: ...RAE 1N Original 08 96 10 13 Page Figure 3 Baseband Circuit Diagram PWRU ...
Страница 306: ...RAE 1N Original 08 96 10 14 Page Figure 4 Baseband Circuit Diagram MCM1 ...
Страница 307: ...RAE 1N Original 08 96 10 15 Page Figure 5 Baseband Circuit Diagram MCM2 ...
Страница 308: ...RAE 1N Original 08 96 10 16 Page Figure 6 RF TX Circuit Diagram ...
Страница 309: ...RAE 1N Original 08 96 10 17 Page Figure 7 RF RX Circuit Diagram ...
Страница 310: ...RAK 1N 10 20 Page Amendment 1 04 97 Figure 18 PCN Component Layout Bottom ...
Страница 311: ...RAK 1N 10 21 Page Amendment 1 04 97 Figure 19 PCN Component Layout Top ...
Страница 312: ...RAK 1N 10 22 Page Amendment 1 04 97 Figure 20 PCN RF TX ...
Страница 313: ...RAK 1N 10 23 Page Amendment 1 04 97 Figure 21 PCN RF RX ...
Страница 314: ...RAK 1N 10 24 Page Amendment 1 04 97 Figure 22 UIF Schematic PCN ...
Страница 315: ...RAK 1N 10 25 Page Amendment 1 04 97 Figure 23 UIF Component Layout PCN ...
Страница 316: ...RAE 1N Original 05 97 10 3 Page Figure 1 PDA Block Diagram Edit 82 for layout 13a ...
Страница 317: ...RAE 1N Original 05 97 10 4 Page Figure 2 PDA Power Unit PWRU Edit 108 for layout 13a ...
Страница 318: ...RAE 1N Original 05 97 10 5 Page Figure 3 PDA Serial Interface SIRU Edit 24 for layout 13a ...
Страница 319: ...RAE 1N Original 05 97 10 6 Page Figure 4 PDA MCU and Memory PROCU Edit 121 for layout 13a ...
Страница 320: ...RAE 1N Original 05 97 10 7 Page Figure 5 PDA EMIU Edit 21 for layout 13a ...
Страница 321: ...RAE 1N Original 05 97 10 8 Page Figure 6 Keyboard matrix Edit 24 for layout 13a ...
Страница 322: ...RAE 1N Original 05 97 10 9 Page Figure 7 PDA Memory Edit 28 for layout 13a ...
Страница 323: ...RAE 1N Original 05 97 10 10 Page Figure 8 PDA Component Layout 13a ...
Страница 324: ...RAE 1N Original 08 96 10 18 Page Figure 1 UIF Schematic ...
Страница 325: ...RAE 1N Original 08 96 10 19 Page Figure 2 Component Layout Uif ...
Страница 326: ...After Sales Technical Documentation RAE RAK 1N Series Original 08 96 Accessories ...
Страница 340: ...After Sales Technical Documentation RAE RAK 1N Series Original 08 96 CARK60 Installation Guide ...
Страница 352: ...After Sales Technical Documentation Appendix 2 RAE RAK 1N Amendment 1 04 97 PARTS LISTS ...
Страница 399: ...After Sales Technical Documentation RAE RAK 1N Parts Lists Page 48 Amendment 1 04 97 Mechanical Assy Parts RAE 1N ...
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Страница 402: ...After Sales Technical Documentation Appendix 1 RAE RAK 1N Original 08 96 QUICK GUIDE ...
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