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AD1959YRSRL bảng dữ liệu(PDF) 7 Page - Analog Devices

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REV. 0
AD1959
–7–
POWER SUPPLY AND VOLTAGE REFERENCE
The AD1959 is designed for five-volt supplies. Separate power
supply pins are provided for the analog, digital, and PLL sec-
tions. These pins should be bypassed with 100 nF ceramic chip
capacitors, as close to the pins as possible, to minimize noise. A
bulk aluminum electrolytic capacitor of at least 22
µF should
also be provided on the same PC board. For best performance it
is recommended that the analog supply be separate from the
digital and PLL supply. It is recommended that all supplies be
isolated by ferrite beads in series with each supply. It is expected
that the digital and PLL sections will be run from a common
supply but isolated from one another. It is important that the
analog supply be as clean as possible.
The internal voltage reference is brought out on Pin 21 (FILTR)
and should be bypassed as close as possible to the chip with a
parallel combination of 10
µF and 100 nF The reference voltage
may be used to bias external op amps to the common-mode
voltage of the analog output signal pins. The current drawn
from the VREF pin should be limited to less than 50
µA.
SERIAL DATA PORTS – DATA FORMAT
The DAC serial data input mode defaults to I
2S. By changing
Bits 4 and 5 in the DAC control register, the mode can be
changed to RJ, DSP, or LJ. The word width defaults to 24 bits
but can be changed by programming Bits 8 and 9 in the DAC
Control Register.
Figure 2 shows the serial mode formats.
LRCLK
BCLK
SDATA
LRCLK
BCLK
SDATA
LRCLK
BCLK
SDATA
LRCLK
BCLK
SDATA
LEFT CHANNEL
RIGHT CHANNEL
LEFT CHANNEL
RIGHT CHANNEL
LEFT CHANNEL
RIGHT CHANNEL
MSB
MSB
MSB
MSB
MSB
MSB
MSB
MSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LEFT-JUSTIFIED MODE – 16 TO 24 BITS PER CHANNEL
12S MODE – 16 TO 24 BITS PER CHANNEL
RIGHT-JUSTIFIED MODE – SELECT NUMBER OF BITS PER CHANNEL
DSP MODE – 16 TO 24 BITS PER CHANNEL
1/fS
NOTES
1. DSP MODE DOES NOT IDENTIFY CHANNEL.
2. LRCLK NORMALLY OPERATES AT fS EXCEPT FOR DSP MODE WHICH IS 2
fS.
3. BCLK FREQUENCY IS NORMALLY 64
LRCLK BUT MAY BE OPERATED IN BURST MODE.
Figure 2. Stereo Serial Modes


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