參數資料
型號： DC845A
廠商： Linear Technology
文件頁數： 1/28頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2448
軟件下載： QuikEval System
設計資源： DC845A Design File
DC845A Schematic
標準包裝： 1
系列： QuikEval™
ADC 的數量： 1
位數： 24
采樣率（每秒）： 8k
數據接口： MICROWIRE?，串行，SPI?
已用 IC / 零件： LTC2448
已供物品： 板
相關產品： LTC2448IUHF#PBF-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448CUHF#PBF-ND - IC ADC 24BIT HI SPEED 38QFN
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LTC2448CUHF#TRPBF-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448CUHF-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448IUHF-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448CUHF#TR-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2448IUHF#TR-ND - IC ADC 24BIT HI SPEED 38QFN
LTC2444/LTC2445/
LTC2448/LTC2449
1
2444589fb
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
■ High Speed Multiplexing
■
Weight Scales
■ Auto Ranging 6-Digit DVMs
■ Direct Temperature Measurement
■
High Speed Data Acquisition
■ Up to 8 Differential or 16 Single-Ended Input
Channels
■ Up to 8kHz Output Rate
■ Up to 4kHz Multiplexing Rate
■ Selectable Speed/Resolution
■ 2
VRMS Noise at 1.76kHz Output Rate
■ 200nVRMS Noise at 13.8Hz Output Rate with
Simultaneous 50/60Hz Rejection
■ Guaranteed Modulator Stability and Lock-Up
Immunity for any Input and Reference Conditions
■ 0.0005% INL, No Missing Codes
■ Autosleep Enables 20
A Operation at 6.9Hz
■ <5
V Offset (4.5V < VCC < 5.5V, –40°C to 85°C)
■ Differential Input and Differential Reference with
GND to VCC Common Mode Range
■ No Latency Mode, Each Conversion is Accurate Even
After a New Channel is Selected
■ Internal Oscillator—No External Components
■ LTC2445/LTC2449 Include MUXOUT/ADCIN for
External Buffering or Gain
■ Tiny QFN 5mm x 7mm Package
24-Bit High Speed
8-/16-Channel
Σ ADCs with
Selectable Speed/Resolution
The LTC
2444/LTC2445/LTC2448/LTC2449 are 8-/16-
channel (4-/8-differential) high speed 24-bit No Latency
ΣTM ADCs. They use a proprietary delta-sigma architec-
ture enabling variable speed/resolution. Through a simple
4-wire serial interface, ten speed/resolution combinations
6.9Hz/280nVRMS to 3.5kHz/25VRMS (4kHz with external
oscillator) can be selected with no latency between con-
version results or shift in DC accuracy (offset, full-scale,
linearity, drift). Additionally, a 2X speed mode can be
selected enabling output rates up to 7kHz (8kHz if an
external oscillator is used) with one cycle latency.
Any combination of single-ended or differential inputs can
be selected with a common mode input range from ground
to VCC, independent of VREF. While operating in the 1X
speed mode the first conversion following a new speed,
resolution, or channel selection is valid. Since there is no
settling time between conversions, all 8 differential chan-
nels can be scanned at a rate of 500Hz. At the conclusion
of each conversion, the converter is internally reset elimi-
nating any memory effects between successive conver-
sions and assuring stability of the high order delta-sigma
modulator.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC2444/LTC2448
Speed vs RMS Noise
Simple 24-Bit Variable Speed Data Acquisition System
SDI
SCK
SDO
CS
FO
REF+
VCC
4.5V TO 5.5V
1
F
COM
REF –
GND
THERMOCOUPLE
VARIABLE SPEED/
RESOLUTION
DIFFERENTIAL
24-BIT
Σ ADC
16-CHANNEL
MUX
+
–
2444 TA01
4-WIRE
SPI INTERFACE
LTC2448
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
(SIMULTANEOUS 50Hz/60Hz
REJECTION AT 6.9Hz OUTPUT RATE)
CH0
CH1
CH7
CH8
CH15
CONVERSION RATE (Hz)
1
0.1
RMS
NOISE
(
V)
1
10
100
10
100
2440 TA02
1000
10000
2.8
V AT 880Hz
280nV AT 6.9Hz
(50/60Hz REJECTION)
VCC = 5V
VREF = 5V
VIN
+ = V
IN
– = 0V
2X SPEED MODE
NO LATENCY MODE
No Latency
Σ is a trademark of Linear Technology Corporation.
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