UA2311

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

4 of 5

www.unisonic.com.tw

QW-R502-043.B



FUNCTIONAL DESCRIPTION

The UTC UA2311 accepts serial input data format of 16-bits word length. Both left and right data words are time

multiplexed. The last 16 bits word before “WS” changes is recognized as the input data. The timing and input signal

formats are shown in Figure 1 and 2.

The most significant bit (bit 1) must always be first. The serial input data is shifted and latched for the Right and

Left Channels. With a HIGH level on the word select input (WS), data is placed in the left input register and with a

LOW level on the WS input, data is placed in the right input register(see Block Diagram). The data in the input

registers are simultaneously latched in the output registers which control the bit switches.

The 16 bits Right/Left Data is then converted to floating point expression whose format consists of 10 bits

mantissa and 7 step exponent. This floating point expression is then converted to analog output voltage by the

LEFT

RIGHT

WS

BCK

DIN

LSB+ 1

LSB

MSB

MSB-1

Figure.1 Input Signal Format

MSB

LSB

RIGHT

LEFT

WS

BCK

Data

MSB

LSB

Sample Out

Figure.2 Timing and Input Signal Formats