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參數資料
| 型號： | DC571A |
| 廠商： | Linear Technology |
| 文件頁數： | 1/48頁 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2418 |
| 軟件下載： | QuikEval System |
| 設計資源： | DC571A Design File DC571A Schematic |
| 標準包裝： | 1 |
| 系列： | QuikEval™ |
| ADC 的數量： | 1 |
| 位數： | 24 |
| 采樣率（每秒）： | 7.5 |
| 數據接口： | MICROWIRE?，串行，SPI? |
| 工作溫度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2418 |
| 已供物品： | 板 |
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LTC2414/LTC2418
1
241418fa
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
The LTC
2414/LTC2418 are 8-/16-channel (4-/8-differ-
ential) micropower 24-bit
Σ analog-to-digital convert-
ers. They operate from 2.7V to 5.5V and include an
integrated oscillator, 2ppm INL and 0.2ppm RMS noise.
They use delta-sigma technology and provide single cycle
settling time for multiplexed applications. Through a
single pin, the LTC2414/LTC2418 can be configured for
better than 110dB differential mode rejection at 50Hz or
60Hz
±2%, or they can be driven by an external oscillator
for a user-defined rejection frequency. The internal oscil-
lator requires no external frequency setting components.
The LTC2414/LTC2418 accept any external differential
reference voltage from 0.1V to VCC for flexible ratiometric
and remote sensing measurement applications. They can
be configured to take 4/8 differential channels or
8/16 single-ended channels. The full-scale bipolar input
range is from – 0.5VREF to 0.5VREF. The reference common
mode voltage, VREFCM, and the input common mode volt-
age, VINCM, may be independently set within GND to VCC.
The DC common mode input rejection is better than 140dB.
The LTC2414/LTC2418 communicate through a flexible
4-wire digital interface that is compatible with SPI and
MICROWIRE
TM protocols.
■ Direct Sensor Digitizer
■ Weight Scales
■ Direct Temperature Measurement
■ Gas Analyzers
■ Strain Gauge Transducers
■ Instrumentation
■ Data Acquisition
■ Industrial Process Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
■ 8-/16-Channel Single-Ended or 4-/8-Channel
Differential Inputs (LTC2414/LTC2418)
■ Low Supply Current (200
A, 4A in Autosleep)
■ Differential Input and Differential Reference
with GND to VCC Common Mode Range
■ 2ppm INL, No Missing Codes
■ 2.5ppm Full-Scale Error and 0.5ppm Offset
■ 0.2ppm Noise
■ No Latency: Digital Filter Settles in a Single Cycle
Each Conversion Is Accurate, Even After a New
Channel is Selected
■ Single Supply 2.7V to 5.5V Operation
■ Internal Oscillator—No External Components
Required
■ 110dB Min, 50Hz/60Hz Notch Filter
8-/16-Channel
24-Bit No Latency
ΣTM ADCs
No Latency
Σ is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Total Unadjusted Error
vs Input Voltage
SDI
SCK
SDO
CS
FO
REF+
VCC
9
11
2.7V TO 5.5V
20
18
17
16
19
1
F
COM
REF –
GND
10
THERMOCOUPLE
12
15
DIFFERENTIAL
24-BIT
Σ ADC
16-CHANNEL
MUX
+
–
241418 TA01a
4-WIRE
SPI INTERFACE
LTC2418
= 50Hz REJECTION
= EXTERNAL OSCILLATOR
= 60Hz REJECTION
VCC
CH0
CH1
21
22
CH7
CH8
28
1
CH15
8
INPUT VOLTAGE (V)
–2.5 –2
–1
0
1.0
2.0
TUE
(ppm
OF
V
REF
)
3
2
1
0
–1
–2
–3
–1.5
–0.5
0.5
1.5
2414/18 TA01b
2.5
VCC = 5V
VREF = 5V
VINCM = VREFCM = 2.5V
FO = GND
TA = 85°C
TA = 25°C
TA = –45°C
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