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参数资料
| 型号： | DAC7644EB |
| 元件分类： | DAC |
| 英文描述： | PARALLEL, WORD INPUT LOADING, 8 us SETTLING TIME, 16-BIT DAC, PDSO48 |
| 封装： | SSOP-48 |
| 文件页数： | 8/21页 |
| 文件大小： | 349K |
| 代理商： | DAC7644EB |
16
DAC7644
DB15
DB14
DB13
DB12
DB11
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
RSTSEL
RST
LOADDACS
R/W
A1
A0
CS
DGND
NC
V
OUTA Sense
V
OUTA
V
REFL AB Sense
V
REFL AB
V
REFH AB
V
REFH AB Sense
V
OUTB Sense
V
OUTB
V
OUTC Sense
V
OUTC
V
REFH CD Sense
V
REFH CD
V
REFL CD
V
REFL CD Sense
V
OUTD Sense
V
OUTD
V
SS
AGND
V
CC
V
DD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
DAC7644
Reset DACs
Data
Bus
Address
Load DAC Registers
READ/WRITE
Chips Select
NC = No Connection
–2.5V to +2.5V
–2.5V
–2.5V to +2.5V
+2.5V
–2.5V
+5V
–5V
0.1
F
0.1
F
1.0
F
1.0
F
+
FIGURE 3. Basic Dual-Supply Operation of the DAC7644.
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. With V
SS
= 0V (single-supply operation), and with RLOAD also con-
nected 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 ampli-
fier 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 (see Figure
4) of only 40m
(R
W2) will cause a voltage drop of 40V.
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 load, a 10 milli-inch
wide printed circuit conductor 600 milli-inches long will
result in a voltage drop of 30
V.
The DAC7644 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 (see Figure 4), thus ensuring an accurate output
voltage.
NC
V
OUTA Sense
V
OUTA
V
REFL AB Sense
V
REFL AB
V
REFH AB
V
REFH AB Sense
V
OUTB Sense
V
OUTB
48
47
46
45
44
43
42
41
40
39
38
37
DAC7644
R
W1
R
W2
+2.5V
+V
V
OUT
R
W1
R
W2
V
OUT
FIGURE 4. Analog Output Closed-Loop Configuration
(1/2 DAC7644). RW represents wiring resis-
tances.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DAC7644EB | 制造商:Texas Instruments 功能描述:IC 16BIT DAC 100KHZ SSOP48 制造商:Texas Instruments 功能描述:IC, 16BIT DAC, 100KHZ, SSOP48 制造商:Texas Instruments 功能描述:IC, 16BIT DAC, 100KHZ, SSOP48; Resolution (Bits):16bit; Sampling Rate:100kSPS; Input Channel Type:Parallel; Supply Voltage Range: 4.75V to 5.25V; Digital IC Case Style:SSOP; No. of Pins:48; Data Interface:Parallel; Supply ;RoHS Compliant: Yes |
| DAC7644EB/1K | 功能描述:数模转换器- DAC 16-Bit Quad 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 |
| DAC7644EB/1KG4 | 功能描述:数模转换器- DAC 16-Bit Quad 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 |
| DAC7644EBG4 | 功能描述:数模转换器- DAC 16-Bit Quad 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 |
| DAC7644EG4 | 功能描述:数模转换器- DAC 16-Bit Quad 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 |
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