LTC2444/LTC2445/
LTC2448/LTC2449
24-Bit High Speed
8-/16-Channel ∆∑ ADCs with
Selectable Speed/Resolution
DescripTion
FeaTures
The LTC®2444/LTC2445/LTC2448/LTC2449 are 8-/16-
channel (4-/8-differential) high speed 24-bit No Latency
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Up to 8 Differential or 16 Single-Ended Input Channels
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Up to 8kHz Output Rate (External f )
O
™
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Up to 4kHz Multiplexing Rate (External f )
∆Σ ADCs. They use a proprietary delta-sigma architec-
O
n
Selectable Speed/Resolution
ture enabling variable speed/resolution. Through a simple
4-wireserialinterface, tenspeed/resolutioncombinations
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2µV
Noise at 1.76kHz Output Rate
RMS
RMS
n
n
200nV
Noise at 13.8Hz Output Rate with
6.9Hz/280nV
to 3.5kHz/25µV
(4kHz with external
RMS
RMS
Simultaneous 50Hz/60Hz Rejection
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.
Guaranteed Modulator Stability and Lock-Up
Immunity for any Input and Reference Conditions
0.0005% INL, No Missing Codes
n
n
n
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Autosleep Enables 20µA Operation at 6.9Hz
<5µV Offset (4.5V < V < 5.5V, –40°C to 85°C)
CC
Any combination of single-ended or differential inputs
can be selected with a common mode input range from
Differential Input and Differential Reference with
GND to V Common Mode Range
CC
ground to V , independent of V . While operating in
CC
REF
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No Latency Mode, Each Conversion is Accurate Even
After a New Channel is Selected
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 dif-
ferential channels can be scanned at a rate of 500Hz.
At the conclusion of each conversion, the converter is
internally reset eliminating any memory effects between
successive conversions and assuring stability of the high
order delta-sigma modulator.
n
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Internal Oscillator—No External Components
LTC2445/LTC2449 Include MUXOUT/ADCIN for
External Buffering or Gain
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Tiny QFN 5mm × 7mm Package
applicaTions
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High Speed Multiplexing
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency ∆∑ and SoftSpan are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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Weight Scales
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Auto Ranging 6-Digit DVMs
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Direct Temperature Measurement
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High Speed Data Acquisition
Typical applicaTion
LTC2444/LTC2448
RMS Noise vs Speed
Simple 24-Bit Variable Speed Data Acquisition System
100
4.5V TO 5.5V
V
V
V
= 5V
CC
= 5V
IN
REF
+
–
= V = 0V
1µF
IN
2X SPEED MODE
+
REF
V
CC
NO LATENCY MODE
CH0
CH1
= EXTERNAL OSCILLATOR
10
1
= INTERNAL OSCILLATOR
F
O
2.8µV AT 880Hz
(SIMULTANEOUS 50Hz/60Hz
REJECTION AT 6.9Hz OUTPUT RATE)
•
•
•
CH7
CH8
SDI
SCK
SDO
CS
280nV AT 6.9Hz
(50/60Hz REJECTION)
16-CHANNEL
MUX
VARIABLE SPEED/
RESOLUTION
+
–
4-WIRE
SPI INTERFACE
THERMOCOUPLE
•
•
•
DIFFERENTIAL
24-BIT ∆∑ ADC
CH15
COM
0.1
1
10
100
1000
10000
–
REF
CONVERSION RATE (Hz)
GND
LTC2448
2440 TA01b
2444 TA01a
2444589fc
1
For more information www.linear.com/LTC2444
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