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參數(shù)資料
| 型號： | SPT7722SIT |
| 廠商： | SIGNAL PROCESSING TECHNOLOGIES |
| 元件分類： | ADC |
| 英文描述： | 8-bit, 250 MSPS A/D Converter with Demuxed Outputs |
| 中文描述： | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP44 |
| 封裝： | TQFP-44 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 217K |
| 代理商： | SPT7722SIT |
SPT7722
DATA SHEET
Rev. 1.0.2 December 2002
9
Figure 4. CLK and Reset Equivalent Circuit
(without ESD Diodes)
Figure 5. Analog Input Equivalent Circuit
Typical Interface Circuit
Very few external components are required to achieve the
stated device performance. Figure 3 shows the typical inter-
face requirements when using the SPT7722 in normal circuit
operation. The following sections provide descriptions of the
major functions and outline performance criteria to consider
for achieving the optimal device performance.
Analog Input
The input of the SPT7722 can be configured in various ways
depending on whether a single-ended or differential input is
desired.
The AC-coupled input is most conveniently implemented
using a transformer with a center-tapped secondary winding.
The center tap is connected to the V
CM
pin as shown in
Figure 3. To obtain low distortion, it is important that the
selected transformer does not exhibit core saturation at the
full-scale voltage. Proper termination of the input is important
for input signal purity. A small capacitor across the input
attenuates kickback noise from the internal track-and-hold.
Figure 6 illustrates a solution (based on operational amplifiers)
that can be used if a DC-coupled single-ended input is
desired.
+
10
μ
F
+A5
+
+D3/5
10
μ
F
T1
V
IN
+
V
IN
–
V
CM
A
IN
Mini-Circuit
T1-6T
50
Interfacing
Logics
+D3/5
DA
0
–DA
7
DB
0
–DB
7
D
D
R
R
C
C
Mode
Select
Reset
Diff In
Clock
Diff
FB
.01
μ
F
.01
μ
F
SPT7722
DCLK
OUT
DCLK
OUT
.01
μ
F
Notes:
1) FB = Ferrite bead. It must placed as close to the ADC as possible.
2) All 0.01 microfarad capacitors are surface mount caps. They must be
placed as close to the respective pin as possible.
3) For details, refer to the Application Note AN7722.
A
C
A
D
O
D
P
30k
+D3/5
Power
Down
Figure 3.Typical Interface Circuit
AGND
AV
CC
7.5k
17.5k
300
300
100k
CLK
&
RES
CLK
&
RES
AGND
100k
100k
200
200
100k
V
IN
+
100k
AV
CC
V
IN
–
300
300
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| SPT7725BIJ | 8-BIT, 300 MSPS, FLASH A/D CONVERTER |
| SPT7725BIQ | 8-BIT, 300 MSPS, FLASH A/D CONVERTER |
| SPT7725 | 8-BIT, 300 MSPS, FLASH A/D CONVERTER |
| SPT7725AIG | 8-BIT, 300 MSPS, FLASH A/D CONVERTER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SPT7722SIT_Q | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8 BIT_ 250 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| SPT7722SITX | 功能描述:直流/直流開關轉(zhuǎn)換器 8 BIT_ 250 MSPS ADC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| SPT7725 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:8-BIT, 300 MSPS, FLASH A/D CONVERTER |
| SPT7725AIG | 制造商:CADEKA 制造商全稱:CADEKA 功能描述:8-BIT, 300 MSPS, FLASH A/D CONVERTER |
| SPT7725AIJ | 制造商:CADEKA 制造商全稱:CADEKA 功能描述:8-BIT, 300 MSPS, FLASH A/D CONVERTER |
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