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参数资料
| 型号： | DAC7631E |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 8 us SETTLING TIME, 16-BIT DAC, PDSO20 |
| 封装： | GREEN, SSOP-20 |
| 文件页数： | 4/22页 |
| 文件大小： | 600K |
| 代理商： | DAC7631E |
12
DAC7631
ANALOG OUTPUTS
When VSS = –5V (dual supply operation), the output ampli-
fier can swing to within 2.25V of the supply rails, guaran-
teed over the –40
°C to +85°C temperature range. When
VSS = 0V (single-supply operation), and with RLOAD also
connected to ground, the output can swing to ground. Care
must also be taken when measuring the zero-scale error
when VSS = 0V. Since the output voltage cannot swing
below ground, the output voltage may not change for the
first few digital input codes (0000H, 0001H, 0002H, etc.) if
the output amplifier has a negative offset. At the negative
limit of –2mV, the first specified output starts at code 0040H.
Due to the high accuracy of these D/A converters, 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
V. With a load current
of 1mA, series wiring and connector resistance of only
40m
(R
W2) will cause a voltage drop of 40V, 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 1/2 m
per square. For a 1mA
FIGURE 2. Basic Single-Supply Operation.
FIGURE 3. Basic Dual-Supply Operation.
load, a 10 milli-inch wide printed circuit conductor 600
milli-inches long will result in a voltage drop of 30
V.
The DAC7631 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, VREFL and VREFH, can be any voltage
between VSS + 2.5V and VCC – 2.5V, provided that VREFH
is at least 1.25V greater than VREFL. The minimum output of
each DAC is equal to VREFL plus a small offset voltage
(essentially, the offset of the output op amp). The maximum
output is equal to VREFH plus a similar offset voltage. Note
that VSS (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 VSS sets several bias points within
the converter. If VSS is not in one of these two configura-
tions, the bias values may be in error and proper operation
of the device is not guaranteed.
Reset DAC Registers
Chip Select
DGND
V
DD
SDI
CLK
CS
V
CC
AGND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DAC7631
V
REFH Sense
V
REFH
V
REFL Sense
V
REFL
SDO
V
SS
V
OUT Sense
V
OUT
NC
RSTSEL
RST
LOAD
Serial Data In
Clock
Load DAC Registers
Load
LDAC
Serial Data Out
+
0.1
F1F
+5V
+2.5000V
0V to +2.5V
Reset DAC Registers
Chip Select
DGND
V
DD
SDI
CLK
CS
V
CC
AGND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DAC7631
V
REFH Sense
V
REFH
V
REFL Sense
V
REFL
SDO
V
SS
V
OUT Sense
V
OUT
NC
RSTSEL
RST
Serial Data In
Clock
Load DAC Registers
Load
LDAC
LOAD
Serial Data Out
+
0.1
F
0.1
F1F
+
+5V
1
F
0.1
F1F
+5V
–5V
+2.5000V
–2.5000V
–2.5V to +2.5V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DAC7631E/1K | 功能描述:数模转换器- DAC Serial Input 16-Bit Voltage Output RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC7631E/1KG4 | 功能描述:数模转换器- DAC Serial Input 16-Bit Voltage Output RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC7631E1K | 制造商:BB 制造商全称:BB 功能描述:Serial Input, 16-Bit, Voltage Output DIGITAL-TO-ANALOG CONVERTER |
| DAC7631EB | 功能描述:数模转换器- DAC Serial Input 16-Bit Voltage Output RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| DAC7631EB | 制造商:Texas Instruments 功能描述:IC 16BIT DAC SERIAL SMD |
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