PT8211_10 Datasheet, PDF (4/13 Pages) Princeton Technology Corp – 16 Bit Digital to Analog Converter

Tel: [phone]
Fax: [phone]
URL: http://www.princeton.com.tw
16 Bit Digital to Analog Converter
PT8211
FUNCTION DESCRIPTION
The serial bus input data format of PT8211 is Japanese or called LSBJ (Least Significant Bit Justified)
format. Each valid DIN data will be shifted to the input register in the rising edge of the BCK, only the
first 16bit data ( from MSB) is valid if the input data length is more than 16bits, other data bit will be
truncated. The clock frequency of the BCK could run up to 20MHz and supported to 8× over-sampling
in 48KHz WS clock rate. Both left and right data words are time multiplexed. Please refer to the
diagrams for timing and input signal formats.
WS
RIGHT CH
LEFT CH
BCK
DIN
LSB
Figure 1. Japanese Input Signal Format
WS
BC K
DIN
MSB
LSB
Figure 2. Timing and Input Signal Formats
The DIN data must be the 2’s complementary format and the MSB (Most Significant Bit) must be the
first. When the Word Select (WS) clock in the Low level, the DIN data will be shifted to the right input
register. likewise, the DIN data will be shifted to the left input register when WS clock in the High level.
The buffered DIN data then feeding to the DAC after both input register are all settled down, this can
eliminated the phase shift happened between two channel output. DAC output is generated by a 16 bit
R-2R resistor ladder network. This signal is driven to the Right/Left Channel (RCH/LCH) via the buffer
operational amplifier.
PT8211 V1.5
-4-
March, 2006