UDA1330ATS_15 Datasheet, PDF (6/23 Pages) NXP Semiconductors – Low-cost stereo filter DAC

NXP Semiconductors
Low-cost stereo filter DAC
Product specification
UDA1330ATS
Interpolation filter (DAC)
The digital filter interpolates from 1f_s to 128f_s by cascading
a recursive filter and an FIR filter (see Table 4).
Table 4 Interpolation filter characteristics
ITEM
Pass-band ripple
Stop band
Dynamic range
CONDITION
0 to 0.45f_s
>0.55f_s
0 to 0.45f_s
VALUE (dB)
±0.1
−50
108
Noise shaper
The 3rd-order noise shaper operates at 128f_s. It shifts
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).
Filter stream DAC
The FSDAC is a semi-digital reconstruction filter that
converts the 1-bit data stream of the noise shaper to an
analog output voltage. The filter coefficients are
implemented as current sources and are summed at virtual
ground of the output operational amplifier. In this way very
high signal-to-noise performance and low clock jitter
sensitivity is achieved. A post-filter is not needed due to
the inherent filter function of the DAC. On-board amplifiers
convert the FSDAC output current to an output voltage
signal capable of driving a line output.
The output voltage of the FSDAC scales linearly with the
power supply voltage.
Pin compatibility
In the L3 mode the UDA1330ATS can be used on boards
that are designed for the UDA1320ATS.
Remark: It should be noted that the UDA1330ATS is
designed for 5 V operation while the UDA1320ATS is
designed for 3 V operation. This means that the
UDA1330ATS can be used with the UDA1320ATS supply
voltage range, but the UDA1320ATS can not be used with
the 5 V supply voltage.
2001 Feb 02
6