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SLG46400 Scheda tecnica(PDF) 39 Page - Dialog Semiconductor

Il numero della parte SLG46400
Spiegazioni elettronici  GreenPAK 2TM Rev.B Programmable Mixed Signal Array
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SLG46400
11.0 Voltage Reference Out (VREF Out)
The VREF macro cell supplies an accurate reference voltage for the SLG46400.
11.1 VREF Output
The output of the VREF cell can be connected to PIN 10 as a buffered or non-buffered output. In order to use the VREF cell within
the SLG46400, the VREF output enable signal (reg<741>) must be turned on.
When the op amp output buffer is enabled through the Vrefo_buf_en signal (reg<740>) the PIN 10 output voltage reference’s
impedance becomes 1kΩ. With the op amp buffer switched out, the PIN 10 output voltage reference’s impedance is 100kΩ.
11.2 VREF Sources
The value of VREF can be set to either use VDD/3 as a voltage source or by setting the ACMP0 to provide the desired voltage
(50mV to 1.5V or 30mV to 1.0V is selectable). The VREF macro cell uses ACMP0’s negative input for the desired reference
voltage.
11.3 VREF Functional Diagram
Figure 11. VREF Functional Diagram
1
0
VDD/3
ACMP0_VREF
Power On
reg <744>
reg <725:722>
cvref
reg <743>
OP
1
0
reg <740>
reg <741>
Vrefo_en
OUT
PIN 10
reg <736>


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