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參數(shù)資料
| 型號(hào)： | HA17008RP |
| 廠商： | Hitachi,Ltd. |
| 元件分類(lèi)： | DAC |
| 英文描述： | 8-Bit Multiplying Digital to Analog Converter(8位乘法D/A轉(zhuǎn)換器) |
| 中文描述： | 8位乘法數(shù)模轉(zhuǎn)換器（8位乘法的D / A轉(zhuǎn)換器） |
| 文件頁(yè)數(shù)： | 3/11頁(yè) |
| 文件大?。?/td> | 61K |
| 代理商： | HA17008RP |
HA17008RP/RFP
3
Functions
Reference differential amplifier and phase compensation
The reference amplifier is a circuit which converts the reference voltage applied to pin 14 through the
external resistor R
14
from a voltage to a current. The converted current is supplied to each bit by a current
mirror and the ladder resistor. Note that this should be used with the polarity of the current flowing in to
pin 14. The reference voltage source provides all of the current flowing into pin 14.
Also, even removing the resistor R
15
will have a minimal influence on precision and temperature drift.
To preserve an appropriate value of the phase margin, it is necessary to increase the value of the phase
compensation capacitance as R
14
is increased. For example, if R
14
is 1 k , 2.5 k , or
5 k , the minimum capacitances should be 15 pF, 37 pF, and 75 pF, respectively. The capacitor is
connected to V
EE
. If high impedance is required in the reference current source, connect R
14
to ground and
connect R
15
to the negative reference voltage. (Refer figure 2.) If a DC reference voltage is used, a bypass
capacitor should be inserted in the reference voltage source to reduce compounded hum and noise. We
cannot recommend the use of noisy 5 V logic power supplies. When a logic control 5 V power supply of
good stability is used for the reference supply, connect a resistor to the reference supply and connect a 0.1
μF capacitor between the reference supply and the resistor contact.
When pin 14 is controlled by a high impedance such as a fixed current supply, phase compensation will not
be possible with the above method. Therefore, provide adequate phase compensation in the frequency band
of the fixed current supply.
5
6
7
8
9
10
11
12
14
15
2
4
16
13
3
HA17008R
V
V
C
I
O
R
L
(+) V
REF
CC
EE
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
R = R
R
14
15
R
15
Figure 1 Positive Reference Potential Application Example
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HA17008RP/RFP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HA17012 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:12-BIT MULTIPLAYING DIGITA-TO-ANALOG CONVERTER |
| HA17012B | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:12-BIT MULTIPLAYING DIGITA-TO-ANALOG CONVERTER |
| HA17012C | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:12-BIT MULTIPLAYING DIGITA-TO-ANALOG CONVERTER |
| HA17080 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:J-FET Input Operational Amplifiers |
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