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參數(shù)資料
| 型號： | LTC2448C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution |
| 中文描述： | 24位ADC的高速8-/16-Channel可選速度/分辨率 |
| 文件頁數(shù)： | 1/28頁 |
| 文件大?。?/td> | 270K |
| 代理商： | LTC2448C |
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LTC2444/LTC2445/
LTC2448/LTC2449
24-Bit High Speed
1
sn2444589 2444589fs
FEATURES
■
Up to 8 Differential or 16 Single-Ended Input
Channels
■
Up to 8kHz Output Rate
■
Up to 4kHz Multiplexing Rate
■
Selectable Speed/Resolution
■
2
μ
V
RMS
Noise at 1.76kHz Output Rate
■
200nV
RMS
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
μ
A Operation at 6.9Hz
■
<5
μ
V Offset (4.5V < V
CC
< 5.5V, –40
°
C to 85
°
C)
■
Differential Input and Differential Reference with
GND to V
CC
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
DESCRIPTIOU
The LTC
2444/LTC2445/LTC2448/LTC2449 are 8-/16-
channel (4-/8-differential) high speed 24-bit No Latency
Σ
TM
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/280nV
RMS
to 3.5kHz/25
μ
V
RMS
(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 V
CC
, independent of V
REF
. 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.
APPLICATIU
■
High Speed Multiplexing
■
Weight Scales
■
Auto Ranging 6-Digit DVMs
■
Direct Temperature Measurement
■
High Speed Data Acquisition
TYPICAL APPLICATIO
U
8-/16-Channel
Σ
ADCs with
Selectable Speed/Resolution
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency
Σ
is a trademark of Linear Technology Corporation.
LTC2444/LTC2448
Speed vs RMS Noise
Simple 24-Bit Variable Speed Data Acquisition System
SDI
SCK
SDO
CS
F
O
REF
+
V
CC
4.5V TO 5.5V
1
μ
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
R
μ
V
1
10
100
10
100
2440 TA02
1000
10000
2.8
μ
V AT 880Hz
280nV AT 6.9Hz
(50/60Hz REJECTION)
V
CC
= 5V
V
= 5V
V
REF
= V
= 0V
2X SPEED MODE
NO LATENCY MODE
相關PDF資料 |
PDF描述 |
|---|---|
| LTC2448CUHF | 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution |
| LTC2448I | 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution |
| LTC2449 | 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution |
| LTC2449C | 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution |
| LTC2449CUHF | 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution |
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