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參數(shù)資料
| 型號(hào)： | ADS803E |
| 英文描述： | 12-Bit, 5MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 12位，5MHz的采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 255K |
| 代理商： | ADS803E |
9
ADS803
V
IN
IN
IN
CM
22
22
100pF
R
T
100pF
+
4.7μF
0.1μF
ADS803
1:n
0.1μF
R
G
DC voltage differences between the IN and IN inputs of the
ADS803 effectively will produce an offset, which can be
corrected for by adjusting the values of resistors R
1
and R
2
.
The bias current of the op amp may also result in an
undesired offset. The selection criteria of the appropriate op
amp should include the input bias current, output voltage
swing, distortion and noise specification. Note that in this
example the overall signal phase is inverted. To re-establish
the original signal polarity it is always possible to inter-
change the IN and IN connections.
SINGLE-ENDED-TO-DIFFERENTIAL
CONFIGURATION (TRANSFORMER COUPLED)
In order to select the best suited interface circuit for the
ADS803, the performance requirements must be known. If
an ac-coupled input is needed for a particular application,
the next step is to determine the method of applying the
signal; either single-ended or differentially. The differential
input configuration may provide a noticeable advantage of
achieving good SFDR performance based on the fact that in
the differential mode the signal swing can be reduced to half
of the swing required for single-ended drive. Secondly, by
driving the ADS803 differentially, the even-order harmonics
will be reduced. Figure 3 shows the schematic for the
suggested transformer coupled interface circuit. The resistor
across the secondary side (R
T
) should be set to get an input
impedance match (e.g., R
T
= n
2
R
G
).
REFERENCE OPERATION
Integrated into the ADS803 is a bandgap reference circuit
including logic that provides either a +1V or +2.5V refer-
ence output, by simply selecting the corresponding pin-strap
configuration. Different reference voltages can be generated
by the use of two external resistors, which will set a different
FIGURE 2. DC-Coupled, Single-Ended Input Configuration with DC-Level Shift.
INPUT
FULL-SCALE
RANGE
REQUIRED
V
REF
MODE
CONNECT
TO
Internal
2Vp-p
+1V
SEL
V
REF
Internal
5Vp-p
+2.5V
SEL
GND
Internal
2V
≤
FSR < 5V
FSR = 2 x V
REF
1V < V
REF
< 2.5V
V
REF
= 1 + (R
1
/R
2
)
R
1
R
2
V
REF
and SEL
SEL and GND
External
1V < FSR < 5V
0.5V < V
REF
< 2.5V
SEL
V
REF
+V
S
Ext. V
REF
TABLE I. Selected Reference Configuration Examples.
gain for the internal reference buffer. For more design
flexibility, the internal reference can be shut off and an
external reference voltage used. Table I provides an over-
view of the possible reference options and pin configura-
tions.
FIGURE 3. Transformer Coupled Input
OPA681
V
IN
+V
S
2Vp-p
0
+1V
–1V
R
F
R
IN
NOTE: R
F
= R
IN
, G = –1
+V
S
ADS803
R
S
24.9
2k
100pF
10
μ
F
+
+2.5V
R
2
R
1
2k
IN
IN
REFB
(+1V)
V
REF
SEL
REFT
0.1
μ
F
0.1
μ
F
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS803U | REC3-SR_DR/H1 Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 12V; Power: 3W; Low Cost 3W converter in DIP24 Package; 1kVDC Isolation; Regulated Output; UL Approved; Continuous Short Circuit Protection; Internal SMD design; 3 Pinout Options, 3 Case Styles.; Efficiency to 75% |
| ADS804 | 12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS804E | 12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS804U | 12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS805 | 12-Bit, 20MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS803E | 制造商:Texas Instruments 功能描述:IC 12BIT ADC SMD SSOP28 803 |
| ADS803E | 制造商:Texas Instruments 功能描述:Analog/Digital Converter IC Number of Bi |
| ADS803E/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 5 MSPS Int/Ext Ref 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 |
| ADS803E/1KG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 5 MSPS Int/Ext Ref 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 |
| ADS803EG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 5 MSPS Int/Ext Ref 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 |
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