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参数资料
| 型号： | DC586A |
| 厂商： | Linear Technology |
| 文件页数： | 1/40页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2431 |
| 软件下载： | QuikEval System |
| 设计资源： | DC586A Design File DC586A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 2 |
| 位数： | 20 |
| 采样率（每秒）： | 7.5 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2431 |
| 已供物品： | 板 |
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LTC2430/LTC2431
1
24301f
The LTC
2430/LTC2431 are 2.7V to 5.5V micropower
20-bit differential
Σ analog-to-digital converters with an
integrated oscillator, 3ppm INL and 0.56ppm RMS noise.
They use delta-sigma technology and provide single cycle
settling time for multiplexed applications. Through a
single pin, the LTC2430/LTC2431 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 converters accept any external differential reference
voltage from 0.1V to VCC for flexible ratiometric and
remote sensing measurement configurations. The full-
scale differential input range is from – 0.5VREF to 0.5VREF.
The reference common mode voltage, VREFCM, and the
input common mode voltage, VINCM, may be indepen-
dently set anywhere within GND to VCC. The DC common
mode input rejection is better than 120dB.
The LTC2430/LTC2431 communicate through a flexible
3-wire digital interface that is compatible with SPI and
MICROWIRE
TM protocols.
s
Direct Sensor Digitizer
s
Weight Scales
s
Direct Temperature Measurement
s
Gas Analyzers
s
Strain Gauge Transducers
s
Instrumentation
s
Data Acquisition
s
Industrial Process Control
s
DVMs and Meters
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Low Supply Current (200
A in Conversion Mode
and 4
A in Autosleep Mode)
s
Differential Input and Differential Reference
with GND to VCC Common Mode Range
s
3ppm INL, No Missing Codes
s
10ppm Full-Scale Error and 1ppm Offset
s
0.56ppm Noise, 20.8 ENOBs
s
No Latency: Digital Filter Settles in a Single Cycle.
Each Conversion Is Accurate, Even After an
Input Step
s
Single Supply 2.7V to 5.5V Operation
s
Internal Oscillator—No External Components
Required
s
110dB Min, 50Hz/60Hz Notch Filter
s
Pin Compatible with 24-Bit LTC2410/LTC2411
20-Bit No Latency
ΣTM ADCs
with Differential Input and
Differential Reference
No Latency
Σ is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
VCC
FO
64
12
REF+
REF–
SCK
IN+
IN–
SDO
GND
CS
ANALOG INPUT RANGE
–0.5VREF TO 0.5VREF
3-WIRE
SPI INTERFACE
0.1
F
0.1
F
LTC2431
24301 TA01
4.7
F
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
VCC
LT1790
(VOUT + 0.25V) TO 20V
VOUT
3V TO 5V
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO S
U
INPUT VOLTAGE (V)
–2.5
TUE
(ppm
OF
V
REF
)
1
3
5
1.5
24301 G01
–1
–3
0
2
4
–2
–4
–5
–1.5
–2
–0.5
–1
0.5
1
2
0
2.5
VCC = 5V
VREF = 5V
VINCM = VINCM = 2.5V
FO = GND
85
°C
25
°C
–45
°C
Total Unadjusted Error
(VCC = 5V, VREF = 5V)
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