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参数资料
| 型号： | DC846A |
| 厂商： | Linear Technology |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2447 |
| 软件下载： | QuikEval System |
| 设计资源： | DC846A Design File DC846A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 8k |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 已用 IC / 零件： | LTC2447 |
| 已供物品： | 板 |
| 相关产品： | LTC2447IUHF#PBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN LTC2447CUHF#PBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN LTC2447IUHF#TRPBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN LTC2447CUHF#TRPBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN |
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LTC2446/LTC2447
22
24467fa
offset and full-scale performance remain unchanged as
does the first multiple of fS.
The sample rate fS and NULL fN, may also be adjusted by
driving the FO pin with an external oscillator. The sample
rate is fS = fEOSC/5, where fEOSC is the frequency of the
clock applied to FO. Combining a large OSR with a reduced
sample rate leads to notch frequencies fN near DC while
maintaining simple antialiasing requirements. A 100kHz
clock applied to FO results in a NULL at 0.6Hz plus all
harmonics up to 20kHz, see Figure 13. This is useful in
applications requiring digitalization of the DC component
of a noisy input signal and eliminates the need of placing
a 0.6Hz filter in front of the ADC.
Figure 13. LTC2446/LTC2447 Normal
Mode Rejection (External Oscillator at 90kHz)
APPLICATIO S I FOR ATIO
WU
UU
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
–40
–20
0
8
24467 F13
–60
–80
246
10
–100
–120
–140
NORMAL
MODE
REJECTION
(dB)
multiplexer. The unique no latency architecture allows
seamless changes in both input channel and reference
while the absolute accuracy ensures excellent matching
between both analog input channels and reference chan-
nels. Any set of inputs (differential or single-ended) can
perform a conversion with one of two references. For
Bridges, RTDs and other ratiometric devices, each set of
channels can perform a conversion with respect to a
unique reference voltage. For Thermocouples, voltage
sense, current sense and other absolute sensors, each set
of channels can perform a conversion with respect to a
single global reference voltage (see Figure 15). This allows
users to measure both multiple absolute and multiple ratio
metric sensors with the same device in such applications
as flow, gas chromatography, multiple RTDs or bridges,
or universal data acquisition.
Average Input Current
The LTC2446 switches the input and reference to a 2pF
capacitor at a frequency of 1.8MHz. A simplified equivalent
circuit is shown in Figure 16. The sample capacitor for the
LTC2447 is 4pF, and its average input current is externally
buffered from the input source.
The average input and reference currents can be ex-
pressed in terms of the equivalent input resistance of the
sample capacitor, where: Req = 1/(fSW Ceq).
An external oscillator operating from 100kHz to 20MHz
can be implemented using the LTC1799 (resistor set
SOT-23 oscillator), see Figure 14. By floating pin 4 (DIV)
of the LTC1799, the output oscillator frequency is:
f
MHz
k
R
OSC
SET
=
10
The normal mode rejection characteristic shown in
Figure 13 is achieved by applying the output of the LTC1799
(with RSET = 100k) to the FO pin on the LTC2446/LTC2447
with SDI tied HIGH (OSR = 32768).
Multiple Ratiometric and Absolute Measurements
The LTC2446/LTC2447 combine a high precision, high
speed delta-sigma converter with a versatile front-end
Figure 14. Simple External Clock Source
24467 F14
0.1
F
LTC1799
OUT
DIV
SET
GND
V+
RSET
NC
VCC
FO
REF67+
REF67–
CH0
CH1
CH2
CH7
COM
REFG+
REFG–
REF01+
REF01–
SCK
SDI
SDO
CS
GND
28
29
30
11
10
35
24
23
8
9
12
22
7
38
37
1,4,5,6,31,32,33
36
34
USER SELECTABLE
REFERENCES
0.1V TO VCC
ANALOG
INPUTS
...
2
1
F
4.5V TO 5.5V
LTC2446
4-WIRE
SPI INTERFACE
BUSY
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| DC847A | 功能描述:BOARD DELTA SIGMA ADC LTC2446 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:QuikEval™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| DC850 | 制造商:Molex 功能描述: |
| DC852A | 功能描述:BOARD DEMO FOR LTC4354 RoHS:是 类别:未定义的类别 >> 其它 系列:* 标准包装:1 系列:* 其它名称:MS305720A |
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| DC8550S | 制造商:DCCOM 制造商全称:Dc Components 功能描述:TECHNICAL SPECIFICATIONS OF PNP EPITAXIAL PLANAR TRANSISTOR |
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