參數(shù)資料
型號(hào)： ADS800
英文描述： 12-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER
中文描述： 12位，40MHz的采樣模擬數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 13/17頁(yè)
文件大小： 368K
代理商： ADS800
ADS800
SBAS035B
13
www.ti.com
set halfway between the two references. This feature can be
used to adjust the gain error, improve gain drift, or to change
the full-scale input range of the ADS800. Changing the full-
scale range to a lower value has the benefit of easing the
swing requirements of external input drive amplifiers. The
external references can vary as long as the value of the
external top reference (REFT
EXT
) is less than or equal to
+3.4V, the value of the external bottom reference (REFB
EXT
)
is greater than or equal to +1.1V, and the difference between
the external references are greater than or equal to 1.5V.
For the differential configuration, the full-scale input
range will be set to the external reference values that are
selected. For the single-ended mode, the input range is
2
(REFT
EXT
–
REFB
EXT
), with the common-mode being
centered at (REFT
EXT
+ REFB
EXT
)/2. Refer to the typical
characteristics for
“
Expected Performance vs Full-Scale In-
put Range
”
.
The circuit in Figure 10 works completely on a single +5V
supply. As a reference element, it uses the micro-power
reference REF1004-2.5, which is set to a quiescent current
of 0.1mA. Amplifier A
2
is configured as a follower to buffer the
+1.25V generated from the resistor divider. To provide the
necessary current drive, a pull-down resistor, R
P
, is added.
Amplifier A
1
is configured as an adjustable gain stage, with
a range of approximately 1 to 1.32. The pull-up resistor
again relieves the op amp from providing the full current
drive. The value of the pull-up/down resistors is not critical
and can be varied to optimize power consumption. The
need for pull-up, pull-down resistors depends only on the
drive capability of the selected drive amplifiers and thus can
be omitted.
FIGURE 9. ADS800 Interface Schematic with AC-Coupling and External Buffers.
GND
LSB
MSB
GND
11
12
13
14
15
16
17
18
9
8
7
6
5
4
3
2
1
19
+V
S
CLK
+V
S
OE
MSBI
+V
S
REFB
CM
REFT
+V
S
GND
IN
IN
GND
15
16
17
18
19
20
21
22
23
24
25
26
27
28
14
13
12
11
10
9
8
7
6
5
4
3
2
1
ADS800
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
R
1
50
R
2
50
Ext
Clk
AC Input
Signal
11
12
13
14
15
16
17
18
9
8
7
6
5
4
3
2
Dir
G+
1
19
Dir
G+
–
541
–
541
Mini-Circuits
TT1-6-KK81
or equivalent
22pF
22pF
(1)
NOTE: (1) All capacitors should be located as close to the pins as the manufacturing
process will allow. Ceramic X7R surface-mount capacitors or equivalent are recommended.
+5V
相關(guān)PDF資料
PDF描述
ADS800U 12-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER
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ADS823E 10-Bit, 60MHz Sampling ANALOG-TO-DIGITAL CONVERTER
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS800E 制造商:Rochester Electronics LLC 功能描述:- Bulk
ADS800E/1K 制造商:Rochester Electronics LLC 功能描述:- Bulk
ADS800U 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 40 MSPS SE/Diff inputs 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
ADS800U/1K 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 40 MSPS SE/Diff inputs 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
ADS800U/1KG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 40 MSPS SE/Diff inputs 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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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