Z86C8316PEC ZILOG [Zilog, Inc.], Z86C8316PEC Datasheet - Page 31

• Manufacturer Part Number: Z86C8316PEC
• Description: Z8 MCU MICROCONTROLLERS
• Manufacturer: ZILOG [Zilog, Inc.]

Z86C83/C84
Z8
FUNCTIONAL DESCRIPTION (Continued)
Digital-to-Analog Converters
The Z86C84 has two Digital-to-Analog Converters
(DACs). Each DAC is an 8-bit resistor string, with a
programmable 0.25X, 0.5X, or 1X gain output buffer. The
DAC output voltage settles after the internal data is latched
into the DAC Data register. The top and bottom ends of the
resistor ladder are register-selected to be connected to
either the analog supply rails, AV
externally-provided reference voltages, VDHI and VDLO.
External references are recommended to explicitly set the
DAC output limits. Since the gain stage cannot drive to the
31
®
Data
Bus
MCU Microcontrollers
8
8
(n = 1 or 2)
Register
Register
DACRn
Control
DACn
Data
CC
8
and A
Figure 28. DAC Block Diagram
GND
, or two
Resistor
Ladder
High
8-Bit
Low
Note:
* DACRn Control Register Bits
supply rails, VDHI and VDLO must be within ranges shown
in the specifications. If either reference approaches the
analog supply rails, the output will be unable to span the
reference
reference voltages should not exceed the supply voltages.
The DAC outputs are latch-up protected and can drive
output loads (Figure 28).
Note: The AV
must be the same value as GND
Analog
voltage
Programmable
+
AGND
-
AVCC
CC
must be the same value as V
* Bits 0, 1
Gain
range.
The
externally
DS96DZ80203
VDLO
DAC1
DAC2
VDHI
CC
or
provided
and A
PAD
PAD
PAD
GND