uda1334bt NXP Semiconductors, uda1334bt Datasheet - Page 7

• Manufacturer Part Number: uda1334bt
• Description: Low Power Audio Dac
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8
8.1
The UDA1334BT operates in slave mode only; this means
that in all applications the system must provide the system
clock and the digital audio interface signals
(BCK and WS).
The system clock must be locked in frequency to the digital
interface signals.
The UDA1334BT automatically detects the ratio between
the SYSCLK and WS frequencies.
The BCK clock can be up to 64f
BCK frequency is 64 times the Word Select (WS)
frequency or less: f
Remarks:
1. The WS edge MUST fall on the negative edge of the
2. For LSB-justified formats it is important to have a WS
The modes which are supported are given in Table 1.
Table 1 Supported sampling ranges
Notes
1. This mode can only be supported for power supply
2. Not supported in the low sampling frequency mode.
An example is given in Table 2 for a 12.228 MHz system
clock input.
2002 May 22
Low power audio DAC
BCK at all times for proper operation of the digital I/O
data interface
signal with a duty factor of 50%.
voltages down to 2.4 V. For lower voltages, in
192f
to 55 kHz.
FUNCTIONAL DESCRIPTION
CLOCK MODE
System clock
s
mode the sampling frequency should be limited
768f
512f
384f
256f
192f
128f
s
s
s
s
s
s
BCK
64
f
WS
s
, or in other words the
SAMPLING RANGE
.
8 to 100 kHz
8 to 100 kHz
8 to 100 kHz
8 to 100 kHz
8 to 100 kHz
8 to 55 kHz
(1)(2)
(2)
7
Table 2 Example using a 12.228 MHz system clock
Note
1. This mode can only be supported for power supply
8.2
The interpolation digital filter interpolates from 1f
by cascading FIR filters (see Table 3).
Table 3 Interpolation filter characteristics
8.3
The 5th-order noise shaper operates at 64f
in-band quantization noise to frequencies well above the
audio band. This noise shaping technique enables high
signal-to-noise ratios to be achieved. The noise shaper
output is converted into an analog signal using a
Filter Stream DAC (FSDAC).
Pass-band ripple
Stop band
Dynamic range
voltages down to 2.4 V. For lower voltages, in 192f
mode the sampling frequency should be limited to
55 kHz.
CLOCK MODE
ITEM
Interpolation filter
Noise shaper
128f
192f
256f
384f
512f
768f
s
s
s
s
s
s
CONDITION
0 to 0.45f
0 to 0.45f
>0.55f
SAMPLING FREQUENCY
s
s
s
UDA1334BT
Product specification
64 kHz
96 kHz
48 kHz
32 kHz
24 kHz
16 kHz
VALUE (dB)
s
. It shifts
>114
(1)
0.02
50
s
to 64f
s
s