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LTC2448IUHF#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LTC2444/LTC2445/
LTC2448/LTC2449
1
2444589fc
For more information www.linear.com/LTC2444
Typical applicaTion
FeaTures DescripTion
24-Bit High Speed
8-/16-Channel ∆∑ ADCs with
Selectable Speed/Resolution
Simple 24-Bit Variable Speed Data Acquisition System
LTC2444/LTC2448
RMS Noise vs Speed
applicaTions
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.
n
Up to 8 Differential or 16 Single-Ended Input Channels
n
Up to 8kHz Output Rate (External f
O
)
n
Up to 4kHz Multiplexing Rate (External f
O
)
n
Selectable Speed/Resolution
n
2µV
RMS
Noise at 1.76kHz Output Rate
n
200nV
RMS
Noise at 13.8Hz Output Rate with
Simultaneous 50Hz/60Hz Rejection
n
Guaranteed Modulator Stability and Lock-Up
Immunity for any Input and Reference Conditions
n
0.0005% INL, No Missing Codes
n
Autosleep Enables 20µA Operation at 6.9Hz
n
<5µV Offset (4.5V < V
CC
< 5.5V, –40°C to 85°C)
n
Differential Input and Differential Reference with
GND to V
CC
Common Mode Range
n
No Latency Mode, Each Conversion is Accurate Even
After a New Channel is Selected
n
Internal Oscillator—No External Components
n
LTC2445/LTC2449 Include MUXOUT/ADCIN for
External Buffering or Gain
n
Tiny QFN 5mm × 7mm Package
n
High Speed Multiplexing
n
Weight Scales
n
Auto Ranging 6-Digit DVMs
n
Direct Temperature Measurement
n
High Speed Data Acquisition
The LTC
®
2444/LTC2445/LTC2448/LTC2449 are 8-/16-
channel (4-/8-differential) high speed 24-bit No Latency
∆Σ
™
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/25µV
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 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.
SDI
SCK
SDO
CS
F
O
REF
+
V
CC
4.5V TO 5.5V
1µF
COM
REF
–
GND
THERMOCOU
PLE
VARIABLE SPEED/
RESOLUTION
DIFFERENTIAL
24-BIT ∆∑ ADC
16-CHANNEL
MUX
+
–
2444 TA01a
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 (µV)
1
10
100
10 100
2440 TA01b
1000
10000
2.8µV AT 880Hz
280nV AT 6.9Hz
(50/60Hz REJECTION)
V
CC
= 5V
V
REF
= 5V
V
IN
+
= V
IN
–
= 0V
2X SPEED MODE
NO LATENCY MODE
LTC2444/LTC2445/
LTC2448/LTC2449
2
2444589fc
For more information www.linear.com/LTC2444
pin conFiguraTion
absoluTe MaxiMuM raTings
Supply Voltage (V
CC
) to GND ....................... –0.3V to 6V
Analog Input Pins Voltage
to GND ......................................–0.3V to (V
CC
+ 0.3V)
Reference Input Pins Voltage
to GND ......................................–0.3V to (V
CC
+ 0.3V)
Digital Input Voltage to GND .........–0.3V to (V
CC
+ 0.3V)
Digital Output Voltage to GND ....... –0.3V to (V
CC
+ 0.3V)
(Notes 1, 2)
LTC2444 LTC2445
13 14 15 16
TOP VIEW
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1GND
BUSY
EXT
GND
GND
GND
COM
NC
CH0
CH1
NC
NC
GND
REF
–
REF
+
V
CC
NC
NC
NC
NC
NC
CH7
CH6
NC
SCK
SDO
CS
F
O
SDI
GND
GND
CH2
CH3
NC
NC
CH4
CH5
NC
23
22
21
20
9
10
11
12
39
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
13 14 15 16
TOP VIEW
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1GND
BUSY
EXT
GND
GND
GND
COM
NC
CH0
CH1
NC
NC
GND
REF
–
REF
+
V
CC
MUXOUTN
ADCINN
ADCINP
MUXOUTP
NC
CH7
CH6
NC
SCK
SDO
CS
F
O
SDI
GND
GND
CH2
CH3
NC
NC
CH4
CH5
NC
23
22
21
20
9
10
11
12
39
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
LTC2448 LTC2449
13 14 15 16
TOP VIEW
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
17 18 19
38
39
37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1GND
BUSY
EXT
GND
GND
GND
COM
CH0
CH1
CH2
CH3
CH4
GND
REF
–
REF
+
V
CC
NC
NC
NC
NC
CH15
CH14
CH13
CH12
SCK
SDO
CS
F
O
SDI
GND
GND
CH5
CH6
CH7
CH8
CH9
CH10
CH11
23
22
21
20
9
10
11
12
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
13 14 15 16
TOP VIEW
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
39
29
30
31
8
7
6
5
4
3
2
1GND
BUSY
EXT
GND
GND
GND
COM
CH0
CH1
CH2
CH3
CH4
GND
REF
–
REF
+
V
CC
MUXOUTN
ADCINN
ADCINP
MUXOUTP
CH15
CH14
CH13
CH12
SCK
SDO
CS
F
O
SDI
GND
GND
CH5
CH6
CH7
CH8
CH9
CH10
CH11
23
22
21
20
9
10
11
12
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
Operating Temperature Range
LTC2444C/LTC2445C/
LTC2448C/LTC2449C ............................... 0°C to 70°C
LTC2444I/LTC2445I/
LTC2448I/LTC2449I ............................. –40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
LTC2444/LTC2445/
LTC2448/LTC2449
3
2444589fc
For more information www.linear.com/LTC2444
orDer inForMaTion
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) 0.1V ≤ V
REF
≤ V
CC
, –0.5 • V
REF
≤ V
IN
≤ 0.5 • V
REF
, (Note 5)
l
24 Bits
Integral Nonlinearity V
CC
= 5V, REF
+
= 5V, REF
–
= GND, V
INCM
= 2.5V, (Note 6)
REF
+
= 2.5V, REF
–
= GND, V
INCM
= 1.25V, (Note 6)
l
5
3
15 ppm of V
REF
ppm of V
REF
Offset Error 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND,
GND ≤ IN
+
= IN
–
≤ V
CC
(Note 12)
l
2.5 5 µV
Offset Error Drift 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND,
GND ≤ IN
+
= IN
–
≤ V
CC
20 nV/°C
Positive Full-Scale Error REF
+
= 5V, REF
–
= GND, IN
+
= 3.75V, IN
–
= 1.25V
REF
+
= 2.5V, REF
–
= GND, IN
+
= 1.875V, IN
–
= 0.625V
l
l
10
10
50
50
ppm of V
REF
ppm of V
REF
Positive Full-Scale Error Drift 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND,
IN
+
= 0.75 • REF
+
, IN
–
= 0.25 • REF
+
0.2 ppm of V
REF
/°C
Negative Full-Scale Error REF
+
= 5V, REF
–
= GND, IN
+
= 1.25V, IN
–
= 3.75V
REF
+
= 2.5V, REF
–
= GND, IN
+
= 0.625V, IN
–
= 1.875V
l
l
10
10
50
50
ppm of V
REF
ppm of V
REF
Negative Full-Scale Error Drift 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND,
IN
+
= 0.25 • REF
+
, IN
–
= 0.75 • REF
+
0.2 ppm of V
REF
/°C
Total Unadjusted Error 5V ≤ V
CC
≤ 5.5V, REF
+
= 2.5V, REF
–
= GND, V
INCM
= 1.25V
5V ≤ V
CC
≤ 5.5V, REF
+
= 5V, REF
–
= GND, V
INCM
= 2.5V
REF
+
= 2.5V, REF
–
= GND, V
INCM
= 1.25V, (Note 6)
15
15
15
ppm of V
REF
ppm of V
REF
ppm of V
REF
Input Common Mode Rejection DC 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND,
GND ≤ IN
–
= IN
+
≤ V
CC
120 dB
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 3, 4)
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2444CUHF#PBF LTC2444CUHF#TRPBF 2444 38-Lead Plastic QFN 0°C to 70°C
LTC2444IUHF#PBF LTC2444IUHF#TRPBF 2444 38-Lead Plastic QFN –40°C to 85°C
LTC2445CUHF#PBF LTC2445CUHF#TRPBF 2445 38-Lead Plastic QFN 0°C to 70°C
LTC2445IUHF#PBF LTC2445IUHF#TRPBF 2445 38-Lead Plastic QFN –40°C to 85°C
LTC2448CUHF#PBF LTC2448CUHF#TRPBF 2448 38-Lead Plastic QFN 0°C to 70°C
LTC2448IUHF#PBF LTC2448IUHF#TRPBF 2448 38-Lead Plastic QFN –40°C to 85°C
LTC2449CUHF#PBF LTC2449CUHF#TRPBF 2449 38-Lead Plastic QFN 0°C to 70°C
LTC2449IUHF#PBF LTC2449IUHF#TRPBF 2449 38-Lead Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
http://www.linear.com/product/LTC2444#orderinfo
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

LTC2448IUHF#TRPBF

Mfr. #:
Buy LTC2448IUHF#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 24-Bit 8-ch. Diff., High Speed Delta-Sigma ADC
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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