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參數(shù)資料
| 型號(hào)： | ADS804E |
| 英文描述： | 12-Bit, 10MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 12位，10MHz的采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 260K |
| 代理商： | ADS804E |
9
ADS804
DC voltage differences between the IN and IN inputs of the
ADS804 effectively will produce an offset, which can be
corrected for by adjusting the values of resistors R1 and R2.
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
ADS804, 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 ADS804 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 ADS804 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.
V
IN
IN
IN
CM
22
22
100pF
R
T
100pF
+
4.7μF
0.1μF
ADS804
1:n
0.1μF
R
G
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.
V
IN
2Vp-p
0
+1V
–1V
R
F
R
IN
NOTE: R
F
= R
IN
, G = –1
+V
S
ADS804
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
OPA681
+V
S
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS804E | 制造商:Texas Instruments 功能描述:Analog/Digital Converter IC Number of Bi |
| ADS804E/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 10 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 |
| ADS804E/1KG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12B 10 MSPS ADC 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 |
| ADS804EG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 10 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 |
| ADS804U | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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