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參數(shù)資料
| 型號(hào)： | DAC716 |
| 英文描述： | 16-Bit DIGITAL-TO-ANALOG CONVERTER with Serial Data Interface |
| 中文描述： | 16位數(shù)字到模擬轉(zhuǎn)換器的串行數(shù)據(jù)接口 |
| 文件頁(yè)數(shù)： | 8/13頁(yè) |
| 文件大?。?/td> | 201K |
| 代理商： | DAC716 |
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DAC716
DAC716 CALIBRATION VALUES
1 LEAST SIGNIFICANT BIT = 152
μ
V
DIGITAL INPUT CODE
STRAIGHT BINARY
ANALOG OUTPUT (V)
UNIPOLAR 10V RANGE
DESCRIPTION
FFFF
H
|
8000
H
+9.999695
+ Full Scale –1LSB
+5.000000
Half Scale
0000
H
0.000000
Unipolar Zero
TABLE I. Digital Input and Analog Output Voltage Calibra-
tion Values.
INSTALLATION
GENERAL CONSIDERATIONS
Due to the high precision of these D/A converters, system
design problems such as grounding and contact resistance
become very important. A 16-bit converter with a 10V full-
scale range has a 1LSB value of 152
μ
V. With a load current
of 5mA, series wiring and connector resistance of only
60m
will cause a voltage drop of 300
μ
V. 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 5mA load, a 0.1 inch wide printed
circuit conductor 0.6 inches long will result in a voltage drop
of 150
μ
V.
The analog output of DAC716 has an LSB size of 152
μ
V
(–96dB). The rms noise floor of the D/A should remain below
this level in the frequency range of interest. The DAC716’s
output noise spectral density (which includes the noise contrib-
uted by the internal reference) is shown in the Typical Perfor-
mance Curves section.
Wiring to high-resolution D/A converters should be routed
to provide optimum isolation from sources of RFI and EMI.
The key to elimination of RF radiation or pickup is small
loop area. Signal leads and their return conductors should be
kept close together such that they present a small capture
cross-section for any external field. Wire-wrap construction
is not recommended.
POWER SUPPLY AND
REFERENCE CONNECTIONS
Power supply decoupling capacitors should be added as
shown in Figure 4. Best performance occurs using a 1 to
10
μ
F tantalum capacitor at –V
CC
. Applications with less
critical settling time may be able to use 0.01
μ
F at –V
CC
as well as at +V
CC
. The capacitors should be located
close to the package.
The DAC716 has separate ANALOG COMMON and DIGI-
TAL COMMON pins. The current through DCOM is mostly
switching transients and are up to 1mA peak in amplitude.
The current through ACOM is typically 5
μ
A for all codes.
Use separate analog and digital ground planes with a single
interconnection point to minimize ground loops. The analog
FIGURE 4. Power Supply Connections.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1μF
1μF
DAC716
DCOM
+V
CC
ACOM
–V
CC
+12V to +15V
–12V to –15V
+
+
pins are located adjacent to each other to help isolate analog
from digital signals. Analog signals should be routed as far
as possible from digital signals and should cross them at
right angles. A solid analog ground plane around the D/A
package, as well as under it in the vicinity of the analog and
power supply pins, will isolate the D/A from switching
currents. It is recommended that DCOM and ACOM be
connected directly to the ground planes under the package.
If several DAC716s are used or if the DAC716 shares
supplies with other components, connecting the ACOM and
DCOM lines together at the power supplies only rather than
at each chip, may give better results.
LOAD CONNECTIONS
Since the reference point for V
OUT
and V
REF
OUT
is the
ACOM pin, it is important to connect the D/A converter load
directly to the ACOM pin. Refer to Figure 5.
Lead and contact resistances are represented by R
1
through
R
3
. As long as the load resistance R
L
is constant, R
1
simply
introduces a gain error and can be removed by gain adjust-
ment of the D/A or system-wide gain calibration. R
2
is part
of R
L
if the output voltage is sensed at ACOM.
In some applications it is impractical to return the load to the
ACOM pin of the D/A converter. Sensing the output voltage
at the SYSTEM GROUND point is reasonable, because there
is no change in DAC716 ACOM current, provided that R
3
is
a low-resistance ground plane or conductor. In this case you
may wish to connect DCOM to SYSTEM GROUND as well.
GAIN AND OFFSET ADJUST
Connections Using Potentiometers
GAIN and OFFSET adjust pins provide for trim using
external potentiometers. 15-turn potentiometers provide suf-
ficient resolution. Range of adjustment of these trims is at
least
±
0.3% of Full Scale Range. Refer to Figure 6.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC716P | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit w/Ser Data 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(shí)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 |
| DAC716P | 制造商:BURR-BROWN 功能描述:IC 16BIT DAC DIP16 716 |
| DAC716PB | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit w/Ser Data 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(shí)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 |
| DAC716PBG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit w/Ser Data 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(shí)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 |
| DAC716PG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit w/Ser Data 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(shí)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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