ADUC814ARUZ-REEL7 Analog Devices Inc, ADUC814ARUZ-REEL7 Datasheet - Page 36

• Manufacturer Part Number: ADUC814ARUZ-REEL7
• Description: 12 BIT ADC WITH EMBEDDED 8-BIT MICRO I.C
• Manufacturer: Analog Devices Inc
• Series: MicroConverter® ADuC8xxr

Specifications of ADUC814ARUZ-REEL7

• Core Processor: 8052
• Core Size: 8-Bit
• Speed: 16.78MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PSM, Temp Sensor, WDT
• Number Of I /o: 17
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 640 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 6x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-ADUC814QSZ - KIT DEV FOR ADUC814 MICROCONVRTR
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADuC814
Figure 40. Source and Sink Current Capability with V
Figure 41. Source and Sink Current Capability with V
4
3
1
0
5
4
3
2
1
0
0
0
DAC LOADED WITH 0FFFH
DAC LOADED WITH 0000H
SOURCE/SINK CURRENT (mA)
SOURCE/SINK CURRENT (mA)
5
5
DAC LOADED WITH 0FFFH
DAC LOADED WITH 0000H
10
10
REF
REF
= V
= V
DD
DD
= 5 V
= 3 V
15
15
Rev. A | Page 36 of 72
For larger loads, the current drive capability may not be sufficient.
To increase the source and sink current capability of the DACs,
an external buffer should be added, as shown in Figure 42.
The DAC output buffer also features a high impedance disable
function. In the chip’s default power-on state, both DACs are
disabled, and their outputs are in a high impedance state (or
three-state) where they remain inactive until enabled in
software. This means that if a zero output is desired during
power-up or power-down transient conditions, then a pull-
down resistor must be added to each DAC output. Assuming
this resistor is in place, the DAC outputs remain at ground
potential whenever the DAC is disabled.
Figure 42. Buffering the DAC Outputs
DAC0
DAC1
ADuC814