參數資料
型號： DAC7643VFBT
英文描述： 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER
中文描述： 16位，雙電壓輸出數字模擬轉換器
文件頁數： 18/20頁
文件大?。?/td> 770K
代理商： DAC7643VFBT
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)
相關PDF資料
PDF描述
DAC7642 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER
DAC7642VFR 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER
DAC7642VFT 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER
DAC7643 Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C
DAC7642VFBR 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER
相關代理商/技術參數
參數描述
DAC7643VFBTG4 功能描述:數模轉換器- DAC 16B Dual Vltg Output DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
DAC7643VFR 功能描述:數模轉換器- DAC 16-Bit Dual Voltage Output DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
DAC7643VFRG4 功能描述:數模轉換器- DAC 16-Bit Dual Voltage Output DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
DAC7643VFT 功能描述:數模轉換器- DAC 16-Bit Dual Voltage Output DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
DAC7643VFTG4 功能描述:數模轉換器- DAC 16-Bit Dual Voltage Output DAC RoHS:否 制造商:Texas Instruments 轉換器數量:1 DAC 輸出端數量:1 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
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