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參數(shù)資料
| 型號： | DAC7632VFR |
| 英文描述： | RIBBON CABLE, 25WAY, PER M; Cores, No. of:25; Conductor make-up:7/36AWG; Wire size, AWG:28AWG; Impedance:119R; Pitch:1.27mm; Voltage rating, AC:50V; Colour:Grey; Capacitance:70.5pF/m; Approval Bodies:UL; Approval category:Style RoHS Compliant: Yes |
| 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)： | 14/21頁 |
| 文件大?。?/td> | 846K |
| 代理商： | DAC7632VFR |
DAC7632
SBAS234
14
www.ti.com
FIGURE 5. Dual Supply Configuration-Buffered References, used for Dual-Supply Performance.
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
DAC7632
1000pF
V
OUT
V
OUT
100
100
+2.5V
+V
–
2.5V
–
V
–
V
+V
OPA2234
2200pF
1000pF
2200pF
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
DAC7632
R
W2
R
W1
+2.5V
+V
V
OUT
R
W1
R
W2
V
OUT
FIGURE 4. Analog Output Closed-Loop Configuration
R
W
represents wiring resistances.
ANALOG OUTPUTS
When V
SS
=
–
5V (dual-supply operation), the output amplifier
can swing to within 2.25V of the supply rails over the
–
40
°
C
to +85
°
C temperature range. When V
SS
= 0V (single-supply
operation), and with R
LOAD
also connected to ground, the
output can swing to ground. Care must also be taken when
measuring the zero-scale error when V
SS
= 0V. Since the
output cannot swing below ground, the output voltage may
not change for the first few digital input codes (0000
H
, 0001
H
,
0002
H
, etc.) if the output amplifier has a negative offset. At
the negative limit of
–
2mV, the first specified output starts at
code 0040
H
.
Due to the high accuracy of these DACs, system design
problems such as grounding and contact resistance become
very important. A 16-bit converter with a 2.5V full-scale range
has a 1LSB value of 38
μ
V. With a load current of 1mA, series
wiring and connector resistance of only 40m
(R
W2
) will
cause a voltage drop of 40
μ
V, as shown in Figure 4. To
understand what this means in terms of a system layout, the
resistivity of a typical 1 ounce copper-clad printed circuit
board is 1/2m
per square. For a 1mA load, a 10 milli-inch
wide printed circuit conductor 600 milli-inches long will result
in a voltage drop of 30
μ
V.
The DAC7632 offers a force and sense output configuration
for the high open-loop gain output amplifier. This feature
allows the loop around the output amplifier to be closed at the
load, as shown in Figure 4, thus ensuring an accurate output
voltage.
REFERENCE INPUTS
The reference inputs, V
REF
L and V
REF
H, can be any voltage
between V
SS
+ 2.5V and V
CC
–
2.5V, provided that V
REF
H is
at least 1.25V greater than V
REF
L. The minimum output of
each DAC is equal to V
REF
L
plus a small offset voltage
(essentially, the offset of the output op amp). The maximum
output is equal to V
REF
H plus a similar offset voltage. Note
that V
SS
(the negative power supply) must either be
connected to ground or must be in the range of
–
4.75V to
–
5.25V. The voltage on V
SS
sets several bias points within
the converter. If V
SS
is not in one of these two configurations,
the bias values may be in error and proper operation of the
device may be affected.
The current into the V
REF
H input and out of V
REF
L depends
on the DAC output voltages, and can vary from a few
microamps to approximately 0.5mA. The reference input
appears as a varying load to the reference supply. If the
reference applied can sink or source the required current, a
reference buffer is not required. The DAC7632 features
reference drive and sense connections such that the internal
errors caused by the changing reference current and the
circuit impedances can be minimized. Figures 5 through 13
show different reference configurations and the effect on the
integral linearity and differential linearity, for each case.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DAC7632VFT | RIBBON CABLE, 26WAY, PER M; Cores, No. of:26; Conductor make-up:7/36AWG; Wire size, AWG:28AWG; Impedance:119R; Pitch:1.27mm; Voltage rating, AC:50V; Colour:Grey; Capacitance:70.5pF/m; Approval Bodies:UL; Approval category:Style RoHS Compliant: Yes |
| DAC7654 | Label; Features:Face paper: 56#gloss coated; Tensile: 30lbf/in.; Adhesive: strong, permanent: Liner: 40# white kraft; Service temp: -4 to ??? deg. F; Min labeling temp: deg. F; Height:4"; Width:4" RoHS Compliant: NA |
| DAC7654YBR | TAPE, ADHESIVE, ALUMINIUM, 19MM; Length, tape:3.66m; Width, tape:19mm RoHS Compliant: Yes |
| DAC7654YBT | 3.2 Mil Aluminum Foil Conductive Acrylic on Liner 1 inch x 18 yd RoHS Compliant: Yes |
| DAC7654YCR | EMI ALUMINUM FOIL SHIELDING TAPE, 1 IN. X 18 YD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC7632VFRG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Dual Vltg Out w/Serial Interface 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 |
| DAC7632VFT | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Dual Vltg Out w/Serial Interface 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 |
| DAC7632VFT | 制造商:Texas Instruments 功能描述:IC 16BIT DAC SMD 7632 LQFP32 |
| DAC7632VFTG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Dual Vltg Out w/Serial Interface 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 |
| DAC7634 | 制造商:BB 制造商全稱:BB 功能描述:16-BIT, QUAD VOLTAGE OUTPUT DIGITAL-TO-ANALOG CONVERTER |
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