No Latency: Digital Filter Settles in a Single Cycle
Each Conversion Is Accurate, Even After a New
Channel is Selected
Single Supply 2.7V to 5.5V Operation
Internal Oscillator—No External Components
Required
110dB Min, 50Hz/60Hz Notch Filter
The LTC
®
2414/LTC2418 are 8-/16-channel (4-/8-differ-
ential) micropower 24-bit
∆Σ
analog-to-digital convert-
ers. They operate from 2.7V to 5.5V and include an
integrated oscillator, 2ppm INL and 0.2ppm RMS noise.
They use delta-sigma technology and provide single cycle
settling time for multiplexed applications. Through a
single pin, the LTC2414/LTC2418 can be configured for
better than 110dB differential mode rejection at 50Hz or
60Hz
±2%,
or they can be driven by an external oscillator
for a user-defined rejection frequency. The internal oscil-
lator requires no external frequency setting components.
The LTC2414/LTC2418 accept any external differential
reference voltage from 0.1V to V
CC
for flexible ratiometric
and remote sensing measurement applications. They can
be configured to take 4/8 differential channels or
8/16 single-ended channels. The full-scale bipolar input
range is from – 0.5V
REF
to 0.5V
REF
. The reference common
mode voltage, V
REFCM
, and the input common mode volt-
age, V
INCM
, may be independently set within GND to V
CC
.
The DC common mode input rejection is better than 140dB.
The LTC2414/LTC2418 communicate through a flexible
4-wire digital interface that is compatible with SPI and
MICROWIRE
TM
protocols.
, 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.
APPLICATIO S
■
■
■
■
■
■
■
■
Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain Gauge Transducers
Instrumentation
Data Acquisition
Industrial Process Control
TYPICAL APPLICATIO
21 CH0
22 CH1
•
•
•
28 CH7
1 CH8
•
•
•
8 CH15
10 COM
2.7V TO 5.5V
11
REF
+
9
V
CC
F
O
19
1µF
V
CC
TUE (ppm OF V
REF
)
= 50Hz REJECTION
= EXTERNAL OSCILLATOR
= 60Hz REJECTION
THERMOCOUPLE
16-CHANNEL
MUX
+
–
DIFFERENTIAL
24-BIT
∆Σ
ADC
SDI
SCK
SDO
CS
20
18
17
16
4-WIRE
SPI INTERFACE
12 REF
–
15
GND
LTC2418
241418 TA01a
U
Total Unadjusted Error
vs Input Voltage
3
2
1
0
T
A
= –45°C
U
U
V
CC
= 5V
V
REF
= 5V
V
INCM
= V
REFCM
= 2.5V
F
O
= GND
T
A
= 25°C
–1
–2
T
A
= 85°C
–3
–2.5 –2 –1.5 –1 –0.5 0 0.5 1.0 1.5 2.0 2.5
INPUT VOLTAGE (V)
2414/18 TA01b
241418fa
1
LTC2414/LTC2418
ABSOLUTE
AXI U
RATI GS
(Notes 1, 2)
Operating Temperature Range
LTC2414/LTC2418C ................................ 0°C to 70°C
LTC2414/LTC2418I ............................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Supply Voltage (V
CC
) to GND .......................– 0.3V to 7V
Analog Input Voltage to GND ....... – 0.3V to (V
CC
+ 0.3V)
Reference Input 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)
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NC
NC
NC
NC
NC
NC
NC
NC
V
CC
REF
+
1
2
3
4
5
6
7
8
9
28 CH7
27 CH6
26 CH5
25 CH4
24 CH3
23 CH2
22 CH1
21 CH0
20 SDI
19 F
O
18 SCK
17 SDO
16 CS
15 GND
COM 10
11
REF
–
12
NC 13
NC 14
GN PACKAGE
28-LEAD PLASTIC SSOP
T
JMAX
= 125°C,
θ
JA
= 110°C/W
ORDER PART NUMBER
LTC2414CGN
LTC2414IGN
Order Options
Tape and Reel: Add #TR
PART MARKING
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
*The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
U
U
W
W W
U
W
TOP VIEW
CH8
CH9
CH10
CH11
CH12
CH13
CH14
CH15
V
CC
REF
+
1
2
3
4
5
6
7
8
9
28 CH7
27 CH6
26 CH5
25 CH4
24 CH3
23 CH2
22 CH1
21 CH0
20 SDI
19 F
O
18 SCK
17 SDO
16 CS
15 GND
COM 10
11
REF
–
12
NC 13
NC 14
GN PACKAGE
28-LEAD PLASTIC SSOP
T
JMAX
= 125°C,
θ
JA
= 110°C/W
ORDER PART NUMBER
LTC2418CGN
LTC2418IGN
PART MARKING
241418fa
LTC2414/LTC2418
ELECTRICAL CHARACTERISTICS
PARAMETER
Resolution (No Missing Codes)
Integral Nonlinearity
CONDITIONS
The
●
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 3, 4)
MIN
●
●
●
TYP
1
2
5
2.5
20
MAX
UNITS
Bits
ppm of V
REF
ppm of V
REF
ppm of V
REF
µV
nV/°C
0.1V
≤
V
REF
≤
V
CC
, – 0.5 • V
REF
≤
V
IN
≤
0.5 • V
REF
(Note 5)
4.5V
≤
V
CC
≤
5.5V, REF
+
= 2.5V, REF
–
= GND, V
INCM
= 1.25V (Note 6)
5V
≤
V
CC
≤
5.5V, REF
+
= 5V, REF
–
= GND, V
INCM
= 2.5V (Note 6)
REF
+
= 2.5V, REF
–
= GND, V
INCM
= 1.25V (Note 6)
2.5V
≤
REF
+
≤
V
CC
, REF
–
= GND,
GND
≤
IN
+
= IN
–
≤
V
CC
(Note 14)
2.5V
≤
REF
+
≤
V
CC
, REF
–
= GND,
GND
≤
IN
+
= IN
–
≤
V
CC
2.5V
≤
REF
+
≤
V
CC
, REF
–
= GND,
IN
+
= 0.75 • REF
+
, IN
–
= 0.25 • REF
+
2.5V
≤
REF
+
≤
V
CC
, REF
–
= GND,
IN
+
= 0.75 • REF
+
, IN
–
= 0.25 • REF
+
2.5V
≤
REF
+
≤
V
CC
, REF
–
= GND,
IN
+
= 0.25 • REF
+
, IN
–
= 0.75 • REF
+
2.5V
≤
REF
+
≤
V
CC
, REF
–
= GND,
IN
+
= 0.25 • REF
+
, IN
–
= 0.75 • REF
+
4.5V
≤
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
5V
≤
V
CC
≤
5.5V, REF
+
= 5V, V
REF
– = GND,
GND
≤
IN
–
= IN
+
≤
5V (Note 13)
24
14
10
Offset Error
Offset Error Drift
Positive Full-Scale Error
Positive Full-Scale Error Drift
Negative Full-Scale Error
Negative Full-Scale Error Drift
Total Unadjusted Error
●
2.5
0.03
12
ppm of V
REF
ppm of V
REF
/°C
●
2.5
0.03
3
3
6
1
12
ppm of V
REF
ppm of V
REF
/°C
ppm of V
REF
ppm of V
REF
ppm of V
REF
µV
RMS
Output Noise
CO VERTER CHARACTERISTICS
PARAMETER
Input Common Mode Rejection DC
Input Common Mode Rejection
60Hz
±2%
Input Common Mode Rejection
50Hz
±2%
Input Normal Mode Rejection
60Hz
±2%
Input Normal Mode Rejection
50Hz
±2%
Reference Common Mode
Rejection DC
Power Supply Rejection, DC
CONDITIONS
The
●
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 3, 4)
MIN
●
●
●
●
●
●
Power Supply Rejection, 60Hz
±2%
REF
+
= 2.5V, REF
–
= GND, IN
–
= IN
+
= GND (Note 7)
Power Supply Rejection, 50Hz
±2%
REF
+
= 2.5V, REF
–
= GND, IN
–
= IN
+
= GND (Note 8)
U
TYP
140
MAX
UNITS
dB
dB
dB
2.5V
≤
REF
+
≤
V
CC
, REF
–
= GND,
GND
≤
IN
–
= IN
+
≤
5V (Note 5)
2.5V
≤
REF
+
≤
V
CC
, REF
–
= GND,
GND
≤
IN
–
= IN
+
≤
5V (Notes 5, 7)
2.5V
≤
REF
+
≤
V
CC
, REF
–
= GND,
GND
≤
IN
–
= IN
+
≤
5V (Notes 5, 8)
(Notes 5, 7)
(Notes 5, 8)
2.5V
≤
REF
+
≤
V
CC
, GND
≤
REF
–
≤
2.5V,
V
REF
= 2.5V, IN
–
= IN
+
= GND (Note 5)
REF
+
= 2.5V, REF
–
= GND, IN
–
= IN
+
= GND
130
140
140
110
110
130
140
140
140
110
120
120
dB
dB
dB
dB
dB
dB
241418fa
3
LTC2414/LTC2418
A ALOG I PUT A D REFERE CE
SYMBOL
IN
+
IN
–
V
IN
REF
+
REF
–
V
REF
C
S
(IN
+
)
C
S
(IN
–
)
C
S
(REF
+
)
C
S
(REF
–
)
I
DC_LEAK
(IN
+
)
I
DC_LEAK
(IN
–
)
I
DC_LEAK
(REF
+
)
I
DC_LEAK
(REF
–
)
PARAMETER
Absolute/Common Mode IN
+
Voltage
Absolute/Common Mode IN
–
Voltage
Input Differential Voltage Range
(IN
+
– IN
–
)
Absolute/Common Mode REF
+
Voltage
Absolute/Common Mode REF
–
Voltage
Reference Differential Voltage Range
(REF
+
– REF
–
)
IN
+
Sampling Capacitance
IN
–
Sampling Capacitance
REF
+
Sampling Capacitance
REF
–
Sampling Capacitance
IN
+
DC Leakage Current
IN
–
DC Leakage Current
REF
+
DC Leakage Current
REF
–
DC Leakage Current
Off Channel to In Channel Isolation
(R
IN
= 100Ω)
t
OPEN
I
S(OFF)
MUX Break-Before-Make Interval
Channel Off Leakage Current
The
●
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
CONDITIONS
●
●
●
●
●
●
DIGITAL I PUTS A D DIGITAL OUTPUTS
SYMBOL
V
IH
V
IL
V
IH
V
IL
I
IN
I
IN
C
IN
C
IN
V
OH
PARAMETER
High Level Input Voltage
CS, F
O
, SDI
Low Level Input Voltage
CS, F
O
, SDI
High Level Input Voltage
SCK
Low Level Input Voltage
SCK
Digital Input Current
CS, F
O
, SDI
Digital Input Current
SCK
Digital Input Capacitance
CS, F
O
, SDI
Digital Input Capacitance
SCK
High Level Output Voltage
SDO
(Note 9)
I
O
= – 800µA
CONDITIONS
2.7V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
3.3V
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
The
●
denotes specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
MIN
●
●
●
●
●
●
2.7V
≤
V
CC
≤
5.5V (Note 9)
2.7V
≤
V
CC
≤
3.3V (Note 9)
4.5V
≤
V
CC
≤
5.5V (Note 9)
2.7V
≤
V
CC
≤
5.5V (Note 9)
0V
≤
V
IN
≤
V
CC
0V
≤
V
IN
≤
V
CC
(Note 9)
4
U
U
U
U
U
U
MIN
GND – 0.3
GND – 0.3
– V
REF
/2
0.1
GND
0.1
TYP
MAX
V
CC
+ 0.3
V
CC
+ 0.3
V
REF
/2
V
CC
V
CC
– 0.1
V
CC
UNITS
V
V
V
V
V
V
pF
pF
pF
pF
18
18
18
18
CS = V
CC
= 5.5V, IN
+
= GND
CS = V
CC
= 5.5V, IN
–
= 5V
CS = V
CC
= 5.5V, REF
+
= 5V
CS = V
CC
= 5.5V, REF
–
= GND
DC
1Hz
f
S
= 15,3600Hz
2.7V
≤
V
CC
≤
5.5V
Channel at V
CC
and GND
●
●
●
●
●
–10
–10
–10
–10
1
1
1
1
140
140
140
10
10
10
10
nA
nA
nA
nA
dB
dB
dB
70
–10
100
1
300
10
ns
nA
TYP
MAX
UNITS
V
V
2.5
2.0
0.8
0.6
2.5
2.0
0.8
0.6
–10
–10
10
10
10
10
V
V
V
V
V
V
µA
µA
pF
pF
V
241418fa
●
V
CC
– 0.5
LTC2414/LTC2418
DIGITAL I PUTS A D DIGITAL OUTPUTS
SYMBOL
V
OL
V
OH
V
OL
I
OZ
PARAMETER
Low Level Output Voltage
SDO
High Level Output Voltage
SCK
Low Level Output Voltage
SCK
Hi-Z Output Leakage
SDO
CONDITIONS
I
O
= 1.6mA
I
O
= – 800µA (Note 10)
I
O
= 1.6mA (Note 10)
●
●
●
●
The
●
denotes specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
MIN
TYP
MAX
0.4
V
CC
– 0.5
0.4
–10
10
UNITS
V
V
V
µA
POWER REQUIRE E TS
SYMBOL
V
CC
I
CC
PARAMETER
Supply Voltage
Supply Current
Conversion Mode
Sleep Mode
Sleep Mode
The
●
denotes specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. (Note 3)
CONDITIONS
●
TI I G CHARACTERISTICS
SYMBOL
f
EOSC
t
HEO
t
LEO
t
CONV
PARAMETER
External Oscillator Frequency Range
External Oscillator High Period
External Oscillator Low Period
Conversion Time
The
●
denotes specifications which apply over the full operating temperature
Definition of interactive projection system:
Interactive projection systems, also known as multimedia interactive projection, are available in floor, wall, and tabletop interactive projection....[详细]
据外媒报道，萨里大学（University of Surrey）的研究人员开发出一种无需依赖GPS即可在人口密集的城市地区精确定位设备位置的人工智能系统。该系统可将定位误差从734米缩小到22米以内，这对于自动驾驶汽车和救援车辆等技术的发展意义重大。 图片来源： 萨里大学 在发表于《IEEE Robotics and Automation Letters》的论文中，研究人员介绍了PEn...[详细]
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