KX1400EW Keterex, KX1400EW Datasheet - Page 14

• 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

Once a command begins shifting in, BUSY is asserted and remains asserted until all pending commands
have completed execution. The BUSY signal provides a means for sequencing control-type commands
for execution after previously initiated audio commands complete. For example, to schedule a Mute or
Set Outputs command to execute at the end of playing a tone or phrase, the MCU must monitor the
BUSY signal and transmit the control command only after BUSY is de-asserted. Otherwise, the control
command will execute before completion of any current or pending audio commands.
It is possible to operate the host MCU interface without using the
KX1400 Audio Playback IC
Note, if more than 8 or 16 bits are transmitted, only the last 8 or 16 bits transmitted before the rising edge
of
transmission of each new command is initiated on the de-assertion of BUSY. This configuration requires
one less MCU I/O but at the expense of less-relaxed latency requirements provided by the double-
buffering of the command buffer.
Figure 6.4 and Table 6.5 provide detailed timing information for the Host MCU Interface signals.
14
CS
¯¯
BUSY
RDY
SCL
SDI
will be used (depending on the specific command). Any leading extra bits will be ignored.
CS
t
RCS
t
BCS
Figure 6.4. Host MCU Interface Timing Diagram
t
SDISU
t
CKSU
t
RDYH
t
BSYH
t
CKH
t
SDIH
t
CKL
RDY
¯¯¯
signal. In such applications, the
t
CSHD
t
CSH