D/A Converter

How much volt does the output voltage become when 0 is input as a data to the digital input of the uPC667 (high-speed D/A converter) ?

In the case of this product, the output voltage is Vref (4V) when the values of all the digital inputs are 0.
The voltage of the output voltage increases as the values of the digital inputs are increased, and reaches Vcc (5V) max.

Even if zero is input as data for the digital input of the uPD6376 (D/A converter for audio), the output voltage does not become 0. What is the relationship between input and output?

In the case of this product, the output voltage is approximately 1.6V when the input value is zero (0000). The output voltage rises as the digital input value is increased to 1, 2, 3, and it falls as the digital input value is decreased to -1, -2, -3.

Digital Input	Decimal	Output Voltage (Reference Value)
0111 1111 1111 1111	+32767	2.6V
0111 1111 1111 1110	+32766	•
0000 0000 0000 0001	+1	•
0000 0000 0000 0000	0	1.6V
1111 1111 1111 1111	-1	•
1111 1111 1111 1110	-2	•
1000 0000 0000 0001	-32767	•
1000 0000 0000 0000	-32768	0.6V