EMC12 ETC2 [List of Unclassifed Manufacturers], EMC12 Datasheet - Page 34

• Manufacturer Part Number: EMC12
• Description: Audio Interface for the EmPack System
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

INPUT CHARACTERISTICS
OUTPUT CHARACTERISTICS
1.5.1.2 Gain Control API Functions
Output Muting:
Overall Input and Output Level Settings:
1. The differential input amplifier introduces a -6dB attenuation, whether the input is configured as
2. Maximum input is 23 Vp-p.
3. “External Atten” selects either 0 or –20 dB .
4. The clamp limits the voltage to protect the CODEC inputs. Care must be taken in setting the
5. The CODEC Input Mux can select either MIC, MIC +20dB , LINE, or the output looped back.
6. The ADC gain can be set to 0 to 22.5 dB in 16 steps of 1.5 dB
7. The overall range of input gain/attenuation is –46 dB to +36.5 dB , where 0 dB results in a full
1. The DAC attenuation can be set from 0 to -94.5 dB in 64 steps of 1.5 dB
2. The output has a +7 dB stage for compatibility with previous CAC products.
3. The final output gain stage introduces a +6dB gain, whether the output is configured as
4. The overall range of output gain/attenuation is –81.5 dB to +13 dB , where 0 dB results in a full
09 Jan 2006
differential or single -ended (see Section 1.5.3).
external attenuator such that its output does not exceed ~4.8 Vp-p, at which point the signal be
clamped.
scale ADC conversion for 2.8 Vp-p at the differential input.
differential or single -ended (see Section 1.5.3).
scale voltage of 2.8 Vp-p at the differential output.
The EmSetCodecMute function controls the analog output muting. Muting is turned on (output
silent) if the Mute argument is TRUE (non-zero) and turned off if it is FALSE. The
EmGetCodecMute function returns the current mute setting in the memory pointed to by its
Mute argument.
int
EmSetCodecMute (
)
RESOURCE_HANDLE Resource,
BOOL Mute
Figure 1-4: CODEC Channel Gain Stages
Communication Automation Corporation
EMC12 Hardware Reference Manual
int
EmGetCodecMute (
)
RESOURCE_HANDLE Resource,
BOOL *Mute
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