ADUC7121 Analog Devices, ADUC7121 Datasheet - Page 41

• Manufacturer Part Number: ADUC7121
• Description: Precision Analog Microcontroller, 12-Bit Analog I/O, ARM7TDMI MCU
• Manufacturer: Analog Devices

Specifications of ADUC7121

• Mcu Core: ARM7 TDMI
• Mcu Speed (mips): 40
• Sram (bytes): 8192Bytes
• Gpio Pins: 32
• Adc # Channels: 9

OTHER ANALOG PERIPHERALS
DIGITAL-TO-ANALOG CONVERTERS
The ADuC7121 incorporates four buffered 12-bit voltage output
string digital-to-analog converters (DACs) on chip. Each DAC has
a rail-to-rail voltage output buffer capable of driving 5 kΩ/100 pF.
Each DAC has three selectable ranges: 0 V to V
band gap 2.5 V reference), 0 V to AV
INT_REF
DAC_REBUF
+
–
EXT_REF
UCLK
AV
DD
TIMER1
HCLK
16/32
DIV
DD
STRING
DAC
, and 0 V to EXT_REF
SW_D0
SW_A0
INTERPOLATOR
DATA_REG
16
REF
(internal
SW_C0
DAC_BUF
SW_B0
12
Figure 28. DAC User Functionality
Figure 27. DAC Configuration
12
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. . . . . .
. . . . . .
DAC0
INT_REF
STRING
DAC
(see Figure 27). The signal range is 0 V to AV
DAC can also operate in interpolation mode.
MMR Interfaces
Each DAC is independently configurable through a control
register and a data register. These two registers are identical for
the 12 DACs. Only DAC0CON and DAC0DAT are described in
detail in this section.
DAC_REBUF
+
–
EXT_REF
SW_C
AV
DD
DAC_BUF
SW_B
STRING
DAC
SW_D11
SW_A12
DACOUT
SW_C11
DAC_BUF
SW_B11
DD
. Note that the
ADuC7121
DAC12