參數(shù)資料
型號(hào): LTC2448CUHF
廠商: Linear Technology
文件頁(yè)數(shù): 1/28頁(yè)
文件大小: 0K
描述: IC ADC 24BIT HI SPEED 38QFN
標(biāo)準(zhǔn)包裝: 52
位數(shù): 24
采樣率(每秒): 8k
數(shù)據(jù)接口: MICROWIRE?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 40mW
電壓電源: 單電源
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 38-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 38-QFN(5x7)
包裝: 管件
輸入數(shù)目和類型: 16 個(gè)單端,雙極;8 個(gè)差分,雙極
配用: DC845A-ND - BOARD DELTA SIGMA ADC LTC2448
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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