KX1400EW Keterex, KX1400EW Datasheet - Page 16

• Manufacturer Part Number: KX1400EW
• Description: Audio D/A Converter ICs KX1400 Audio Playback IC
• Manufacturer: Keterex

Specifications of KX1400EW

• Resolution: 12 bit
• Operating Supply Voltage: 2.7 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Maximum Power Dissipation: 120 mW
• Mounting Style: SMD/SMT
• Number Of Dac Outputs: 2
• Power Consumption: 320 mW
• Supply Current: 50 mA
• Thd Plus Noise: 40 dB
• Package / Case: SOIC-20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

frequency for a specified period of time. Tones can easily be sequenced together to play musical
melodies or generate sound effects. Sounds created by storing and sending commands to the tone
generator can produce significant savings in data storage requirements over storing and playing recorded
PCM or ADPCM audio data.
KX1400 Audio Playback IC
6.6. Volume Control
The Digital Audio Processor includes a volume control function. Volume control is performed by digitally
adjusting the amplitude of the signal level before sending to the class-D amplifier stage. The amplitude
can be varied from 0 to 100 percent in 16 equal linear steps.
The volume is adjusted by sending the Set Volume command via the MCU host interface or as part of a
phrase processed from external memory. Refer to Section 8.8 for detailed information on the use of the
Set Volume command. Note: a volume level of zero does not mute the output (disable the speaker
driver). It only attenuates the audible components of the output signal. Use the Mute and Un-mute
commands to disable/enable the output signal (see Section 6.8).
6.7. Tone Generator
The on-chip tone generator synthesizes audio data in the form of a single sine wave of a specified
6.7.1. Tone Frequency
Tones are created by sending the Play Tone command via the MCU host interface or as part of a phrase
processed from external memory. The Play Tone command includes a Frequency Index which specifies
the frequency to be generated in Hertz using the following formula:
16
Figure 6.6. Audio Processor Frequency Characteristics
-10
-20
-30
-40
-50
-60
-70
-80
10
0
100
Frequency
500
Frequency (Hz)
1K
=
. 4
Index
096
Hz
5K
10K