參數(shù)資料
型號(hào)： DDC101
英文描述： 20-BIT ANALOG-TO-DIGITAL CONVERTER
中文描述： 20位模擬數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 23/27頁(yè)
文件大?。?/td> 346K
代理商： DDC101
23
DDC101
Power Supplies
The
±
5VDC supplies of the DDC101 should be bypassed
with 10
μ
F solid tantalum capacitors and 0.1
μ
F ceramic
capacitors. The supplies should each have a 10
μ
F solid
tantalum capacitor at a central point on the PC board. Each
of the DDC101 power supply lines (V
+, V
–, V
+) should
have a separate 0.1
μ
F ceramic capacitor placed as close to
the DDC101 package as possible.
The digital power supply voltage, V
+ must be equal to or
less than the analog power supply voltage, V
+. The analog
power supply, V
+, is connected to pins 5 and 6, these pins
should be hardwired together on the printed circuit board at
the pins for best performance.
V
+ should be as quiet as possible with minimal noise
coupling. It is particularly important to eliminate noise from
V
+ that is non-synchronous with DDC101 operation.
Figure 23 illustrates two acceptable ways to supply V
+
power to the DDC101. The first case shows two separate
+5VDC supplies for V
+ and V
+. The second case shows
the V
+ power supply derived from the V
+ supply as used
on the DDC101 Evaluation Fixture Device Under Test
(DUT) board.
Oversampling Control
Samples/Integration—M - 4 bits
CODE
SAMPLES PER INTEGRATION
0000
0001
0010
0011
0100
0101
0110
0111
1XXX
1
2
4
8
16
32
64
128
256
SECTION 7
APPLICATIONS INFORMATION
BASIC PRINTED CIRCUIT BOARD LAYOUT
As with any precision circuit, careful printed circuit layout
will ensure best performance. Make short, direct intercon-
nections and avoid stray wiring capacitance—particularly at
the analog input pin. Digital signals should be kept as far
from the analog input signals as possible on the PC board.
Leakage currents between PC board traces can exceed the
input bias current of the DDC101 if care is not taken. A
circuit board “guard” pattern for the analog input pin and for
the PC board trace that connects to the analog input pin is
recommended. The guard pattern reduces leakage effects by
surrounding the analog input pin and trace with a low
impedance analog ground. Leakage currents from other
portions of the circuit will flow harmlessly to the low
impedance analog ground rather than into the analog input
of the DDC101. Analog ground pins are placed on either
side of the analog input pin in the DDC101 package to allow
convenient layout of guard patterns. Figure 22 illustrates the
use of guard patterns to protect the analog input.
Multiple Integration Control
Integrations/Conversion—L - 4 bits
CODE
INTEGRATIONS PER CONVERSION
0000
0001
0010
0011
0100
0101
0110
0111
1XXX
1
2
4
8
16
32
64
128
256
Input Range - 1 bit
CODE
INPUT RANGE
0
1
Unipolar
Bipolar
Output Format - 1 bit
CODE
OUTPUT FORMAT
1
0
Binary Two's Complement
Straight Binary
FIGURE 22. PC Board Layout Showing “Guard” Traces
Surrounding Analog Input Pin and Traces.
5
DDC101
6
12
0.1μF
0.1μF
10
10μF
V
S
+
One +5VDC Supply
5
DDC101
6
12
0.1μF
0.1μF
10μF
V
S
+
Separate +5VDC Supplies
10μF
V
DD
+
FIGURE 23. Positive Supply Connection Options.
DDC101
V
S
–
Guard
Pattern
Analog Common
Analog Input
Analog Common
Pin 1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DDC101P 制造商:Rochester Electronics LLC 功能描述:- Bulk
DDC101U 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 20-Bit Anlg-to-Dig Converter RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
DDC101UG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 20-Bit Anlg-to-Dig Converter RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
DDC1021 制造商:MPSIND 制造商全稱:MPS Industries, Inc. 功能描述:3W, Wide Input Range SMD, Single & Dual Output DC/DC Converters
DDC1022 制造商:MPSIND 制造商全稱:MPS Industries, Inc. 功能描述:3W, Wide Input Range SMD, Single & Dual Output DC/DC Converters
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