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參數(shù)資料
| 型號： | DAC7643VFR |
| 英文描述： | 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 16位，雙電壓輸出數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大?。?/td> | 770K |
| 代理商： | DAC7643VFR |
DAC7642, DAC7643
SBAS233
18
www.ti.com
(2)
DIGITALLY-PROGRAMMABLE
CURRENT SOURCE
The DAC7642 and DAC7643 offer a unique set of features
that allows a wide range of flexibility in designing applications
circuits, such as programmable current sources. The
DAC7642 and DAC7643 offer both a differential reference
input, as well as an open-loop configuration around the
output amplifier. The open-loop configuration around the
output amplifier allows a transistor to be placed within the
loop to implement a digitally-programmable, unidirectional
current source. The availability of a differential reference also
allows programmability for both the full-scale and zero-scale
currents. The output current is calculated as:
I
V
H
V
L
R
N Value
,
65 536
V
L R
/
OUT
REF
REF
SENSE
REF
SENSE
=
+
(
)
–
FIGURE 15. 4-20mA Digitally Controlled Current Source.
V
OUT
A
V
OUT
A Sense
V
REF
L Sense
V
REF
L
V
REF
H
V
REF
H Sense
V
OUT
B Sense
V
OUT
B
32
31
30
29
28
27
26
25
DAC7642
DAC7643
1000pF
I
OUT
100
+2.5V
20k
80k
+V
+V
OPA2350
100
2200pF
1000pF
2200pF
V
PROGRAMMED
125
I
OUT
V
PROGRAMMED
125
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t
RCS
t
RDS
t
RDH
t
DZ
t
CSD
t
WCS
t
WS
t
WH
t
AS
t
AH
t
LS
t
LH
t
LX
t
DS
t
DH
t
LWD
t
RSS
t
RSH
S
CS LOW for Read
R/W HIGH to CS LOW
R/W HIGH after CS HIGH
CS HIGH to Data Bus in High Impedance
CS LOW to Data Bus Valid
CS LOW for Write
R/W LOW to CS LOW
R/W LOW after CS HIGH
DACSEL Valid to CS LOW
DACSEL Valid after CS HIGH
CS LOW to LOADDACS HIGH
CS LOW after LOADDACS HIGH
LOADDACS HIGH
Data Valid to CS LOW
Data Valid after CS HIGH
LOADDACS LOW
RESET LOW
RESET HIGH
Settling Time
150
10
10
10
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
μ
s
100
150
100
40
0
10
0
10
30
100
100
0
10
100
10
10
10
TABLE II. Timing Specifications (T
A
=
–
40
°
C to +85
°
C).
Figure 15 shows a DAC7642 and DAC7643 in a 4-20mA
current output configuration. The output current can be
determined by Equation 3:
I
V
125
V
N Value
65 536
,
V
OUT
=
2 5
.
0 5
0 5
125
–
.
.
At full-scale, the output current is 16mA plus the 4mA for the
zero current. At zero scale the output current is the offset
current of 4mA (0.5V/125
).
(3)
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| DAC7643VFT | 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER |
| DAC7643VFBR | 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER |
| DAC7643VFBT | 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER |
| DAC7642 | 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER |
| DAC7642VFR | 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
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| DAC7643VFRG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Dual Voltage Output DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7643VFT | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Dual Voltage Output DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7643VFTG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Dual Voltage Output DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7644 | 制造商:BB 制造商全稱:BB 功能描述:16-Bit, Quad Voltage Output DIGITAL-TO-ANALOG CONVERTER |
| DAC7644E | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Quad Voltage Output RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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