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| 型號： | UPD30181AYF1-131-GA3 |
| 廠商： | NEC Corp. |
| 英文描述： | 64-/32-BIT MICROPROCESSOR |
| 中文描述： | 64-/32-BIT微處理器 |
| 文件頁數(shù)： | 67/72頁 |
| 文件大?。?/td> | 447K |
| 代理商： | UPD30181AYF1-131-GA3 |
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Data Sheet U16277EJ1V0DS
67
μ
PD30181A, 30181AY
D/A Converter Characteristics (T
A
= –40 to +85
°
C, V
DD25
= 2.3 to 2.7 V, V
DD33
= 3.0 to 3.6 V)
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
Integral linearity
error
Notes 1, 2
INL
±
3.0
LSB
Differential linearity
error
Notes 1, 2
DNL
±
3.0
LSB
String unit resistor
R
ST
4
String output equivalent resistor
R
STOUT
1110
Notes 1.
Applies to AOUT pin.
2.
Excluding quantization error.
Remark
LSB: Least significant bit
Cautions 1. The output impedance of the D/A converter is too large to latch the current from AOUT pin. If
the load input impedance is small, insert a buffer amplifier between the load and the AOUT
pin. Make the wiring between the buffer amplifier and load as short as possible.
If the wiring is long, processing is required such as enclosing the wiring in a with ground
pattern.
2. The output voltage of the D/A converter changes in steps, so use the output signal from the
D/A converter after passing it through a low pass filter.
D/A converter output equivalent circuit
R
STOUT
AOUT
VDDAD
Series
resistor
string
GNDAD
V
R
4181A
0
1023
1/2
R
ST
1/2
R
ST
R
ST
Tap
selector
Remark
The series resistor string is connected between the reference voltage for the A/D converter (VDDAD)
and GND (GNDAD) for the A/D converter. To make the 1024 equivalent voltage steps between the
two pins, this circuit consists of 1023 equivalent unit resistors (R
ST
) and two resistors with a
resistance of half R
ST
. The equivalent output impedance of the AOUT pin is the value calculated by
adding R
STOUT
to the total R
ST
value corresponding to the selected voltage step.
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