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參數(shù)資料
| 型號： | LTC2442CG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 24-Bit High Speed 4-Channel Delta-Sigma ADC with Integrated Amplifi er |
| 中文描述： | 4-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO36 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-36 |
| 文件頁數(shù)： | 1/32頁 |
| 文件大?。?/td> | 392K |
| 代理商： | LTC2442CG |
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LTC2442
1
2442f
V
IN
DIFFERENTIAL (V)
–2.048
–5
E
–4
–2
–1
0
5
2
–1.024
0
2442 TA02
–3
3
4
1
1.024
2.048
V
INCM
= 2.048V
V
REF
= 4.096V
V
CC
= 5V
V
+
= 5V
V
–
= 0V
24-Bit High Speed
4-Channel
ΔΣ
ADC
with Integrated Amplifier
DESCRIPTIO
U
The LTC
2442 is an ultra high precision, variable speed,
24-bit
ΔΣ
TM
ADC with integrated amplifier. The amplifier
can be configured as a buffer for easy input drive of high
impedance sensors. 1 part-per-million (ppm) linearity is
achievable when the amplifier is configured in unity gain.
External resistors can be used to set a gain for increased
resolution of low level input signals. The positive and
negative amplifier supply pins may be tied directly to V
CC
(4.5V to 5.5V) and GND or biased above V
CC
and below
GND for rail-to-rail input signals.
The proprietary
ΔΣ
architecture ensures stable DC ac-
curacy through continuous transparent calibration. Ten
speed/resolution combinations from 6.9Hz/220nV
RMS
to
3.5kHz/25μV
RMS
can be selected with no latency or shift
in DC accuracy. Additionally, a 2X speed mode can be
selected enabling output rates up to 7kHz (8kHz with an
external oscillator) with one cycle latency.
Any combination of single-ended (up to 4 inputs) or dif-
ferential (up to 2 inputs) can be selected with a common
mode input range from ground to V
CC
. While operating in
the 1X speed mode the first conversion following a new
speed/resolution or channel selection is valid.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency
Σ
is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6140950, 6169506, 6411242, 6639526.
■
Auto Ranging 6-Digit DVMs
■
High Speed Multiplexing
■
Weight Scales
■
Direct Temperature Measurement
■
High Speed Data Acquisition
■
1ppm Linearity with No Missing Codes
■
Integrated Amplifier for Direct Sensor Digitization
■
2 Differential or 4 Single-Ended Input Channels
■
Up to 8kHz Output Rate
■
Up to 4kHz Multiplexing Rate
■
Selectable Speed/Resolution
220nV
RMS
Noise at 13.8Hz Output Rate with
Simultaneous 50Hz/60Hz Rejection
■
Guaranteed Modulator Stability and Lock-Up
Immunity for any Input and Reference Conditions
■
<5μV 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
■
36-Lead SSOP Package
APPLICATIU
2μV
RMS
Noise at 1.76kHz Output Rate
High Precision Data Acquisition System
FEATURES
TYPICAL APPLICATIO
U
LTC2442 Integral Non-Linearity
SDI
SCK
SDO
CS
F
O
V
CC
4.5V TO 5.5V
4.5V TO 15V
–15V TO 0V
0.1
μ
F
GND
V
REF
–
V
REF
+
2442 TA01
4-WIRE
SPI INTERFACE
LTC2442
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
(SIMULTANEOUS 50Hz/60Hz
REJECTION AT 6.9Hz OUTPUT RATE)
CH0
CH1
CH2
CH3
COM
0.1
μ
F
AUTO-CAL
VARIABLE SPEED/
RESOLUTION
DIFFERENTIAL
24-BIT
Σ
ADC
HIGH Z
2-CHANNEL
DIFFERENTIAL/
4-CHANNEL
SINGLE ENDED
–
+
–
+
V
+
V
–
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