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LTC2414/LTC2418
8-/16-Channel
24-Bit No Latency ∆ΣTM ADCs
FEATURES
8-/16-Channel Single-Ended or 4-/8-Channel
Differential Inputs (LTC2414/LTC2418)
Low Supply Current (200µA, 4µA in Autosleep)
Differential Input and Differential Reference
with GND to VCC Common Mode Range
2ppm INL, No Missing Codes
2.5ppm Full-Scale Error and 0.5ppm Offset
0.2ppm Noise
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
U
APPLICATIO S
Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain Gauge Transducers
Instrumentation
Data Acquisition
Industrial Process Control
DESCRIPTIO
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 VCC 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 – 0.5VREF to 0.5VREF. The reference common
mode voltage, VREFCM, and the input common mode volt-
age, VINCM, may be independently set within GND to VCC.
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
MICROWIRETM 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.
TYPICAL APPLICATIO
2.7V TO 5.5V
THERMOCOUPLE
21 CH0
22 CH1
28 CH7
1 CH8
8 CH15
10 COM
16-CHANNEL
MUX
11 9
REF+ VCC
+ DIFFERENTIAL
24-BIT ∆Σ ADC
1µF
19
FO
VCC
= 50Hz REJECTION
= EXTERNAL OSCILLATOR
= 60Hz REJECTION
SDI 20
18
SCK
SDO 17
16
CS
4-WIRE
SPI INTERFACE
12 REF
15 GND
LTC2418
241418 TA01a
Total Unadjusted Error
vs Input Voltage
3
VCC = 5V
VREF = 5V
2 VINCM = VREFCM = 2.5V
FO = GND
1
TA = 25°C
0
TA = –45°C
–1 TA = 85°C
–2
–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
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LTC2414/LTC2418
ABSOLUTE AXI U RATI GS (Notes 1, 2)
Supply Voltage (VCC) to GND .......................– 0.3V to 7V
Analog Input Voltage to GND ....... – 0.3V to (VCC + 0.3V)
Reference Input Voltage to GND .. – 0.3V to (VCC + 0.3V)
Digital Input Voltage to GND ........ – 0.3V to (VCC + 0.3V)
Digital Output Voltage to GND ..... – 0.3V to (VCC + 0.3V)
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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NC 1
NC 2
NC 3
NC 4
NC 5
NC 6
NC 7
NC 8
VCC 9
COM 10
REF+ 11
REF12
NC 13
NC 14
28 CH7
27 CH6
26 CH5
25 CH4
24 CH3
23 CH2
22 CH1
21 CH0
20 SDI
19 FO
18 SCK
17 SDO
16 CS
15 GND
GN PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 110°C/W
ORDER PART NUMBER
PART MARKING
LTC2414CGN
LTC2414IGN
TOP VIEW
CH8 1
CH9 2
CH10 3
CH11 4
CH12 5
CH13 6
CH14 7
CH15 8
VCC 9
COM 10
REF+ 11
REF12
NC 13
NC 14
28 CH7
27 CH6
26 CH5
25 CH4
24 CH3
23 CH2
22 CH1
21 CH0
20 SDI
19 FO
18 SCK
17 SDO
16 CS
15 GND
GN PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 110°C/W
ORDER PART NUMBER
PART MARKING
LTC2418CGN
LTC2418IGN
Order Options Tape and Reel: Add #TR
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.
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LTC2414/LTC2418
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Notes 3, 4)
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Resolution (No Missing Codes) 0.1V VREF VCC, – 0.5 • VREF VIN 0.5 • VREF (Note 5)
24
Integral Nonlinearity
4.5V VCC 5.5V, REF+ = 2.5V, REF= GND, VINCM = 1.25V (Note 6)
5V VCC 5.5V, REF+ = 5V, REF= GND, VINCM = 2.5V (Note 6)
REF+ = 2.5V, REF= GND, VINCM = 1.25V (Note 6)
1
2 14
5
Offset Error
2.5V REF+ VCC, REF= GND,
GND IN+ = INVCC (Note 14)
2.5 10
Offset Error Drift
2.5V REF+ VCC, REF= GND,
GND IN+ = INVCC
20
Positive Full-Scale Error
2.5V REF+ VCC, REF= GND,
IN+ = 0.75 • REF+, IN= 0.25 • REF+
2.5 12
Bits
ppm of VREF
ppm of VREF
ppm of VREF
µV
nV/°C
ppm of VREF
Positive Full-Scale Error Drift
2.5V REF+ VCC, REF= GND,
IN+ = 0.75 • REF+, IN= 0.25 • REF+
0.03 ppm of VREF/°C
Negative Full-Scale Error
Negative Full-Scale Error Drift
2.5V REF+ VCC, REF= GND,
IN+ = 0.25 • REF+, IN= 0.75 • REF+
2.5V REF+ VCC, REF= GND,
IN+ = 0.25 • REF+, IN= 0.75 • REF+
2.5 12
ppm of VREF
0.03 ppm of VREF/°C
Total Unadjusted Error
Output Noise
4.5V VCC 5.5V, REF+ = 2.5V, REF= GND, VINCM = 1.25V
5V VCC 5.5V, REF+ = 5V, REF= GND, VINCM = 2.5V
REF+ = 2.5V, REF= GND, VINCM = 1.25V
5V VCC 5.5V, REF+ = 5V, VREF– = GND,
GND IN= IN+ 5V (Note 13)
3 ppm of VREF
3 ppm of VREF
6 ppm of VREF
1 µVRMS
CO VERTER CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Notes 3, 4)
PARAMETER
Input Common Mode Rejection DC
Input Common Mode Rejection
60Hz ±2%
Input Common Mode Rejection
50Hz ±2%
CONDITIONS
2.5V REF+ VCC, REF= GND,
GND IN= IN+ 5V (Note 5)
2.5V REF+ VCC, REF= GND,
GND IN= IN+ 5V (Notes 5, 7)
2.5V REF+ VCC, REF= GND,
GND IN= IN+ 5V (Notes 5, 8)
MIN TYP MAX
130 140
140
140
Input Normal Mode Rejection
60Hz ±2%
Input Normal Mode Rejection
50Hz ±2%
Reference Common Mode
Rejection DC
Power Supply Rejection, DC
Power Supply Rejection, 60Hz ±2%
Power Supply Rejection, 50Hz ±2%
(Notes 5, 7)
(Notes 5, 8)
2.5V REF+ VCC, GND REF2.5V,
VREF = 2.5V, IN= IN+ = GND (Note 5)
REF+ = 2.5V, REF= GND, IN= IN+ = GND
REF+ = 2.5V, REF= GND, IN= IN+ = GND (Note 7)
REF+ = 2.5V, REF= GND, IN= IN+ = GND (Note 8)
110 140
110 140
130 140
110
120
120
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
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LTC2414/LTC2418
A ALOG I PUT A D REFERE CE The denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL
IN+
IN
VIN
REF+
REF
VREF
CS (IN+)
CS (IN)
CS (REF+)
CS (REF)
IDC_LEAK (IN+)
IDC_LEAK (IN)
IDC_LEAK (REF+)
IDC_LEAK (REF)
PARAMETER
Absolute/Common Mode IN+ Voltage
Absolute/Common Mode INVoltage
Input Differential Voltage Range
(IN+ – IN)
Absolute/Common Mode REF+ Voltage
Absolute/Common Mode REFVoltage
Reference Differential Voltage Range
(REF+ – REF)
IN+ Sampling Capacitance
INSampling Capacitance
REF+ Sampling Capacitance
REFSampling Capacitance
IN+ DC Leakage Current
INDC Leakage Current
REF+ DC Leakage Current
REFDC Leakage Current
Off Channel to In Channel Isolation
(RIN = 100)
tOPEN
IS(OFF)
MUX Break-Before-Make Interval
Channel Off Leakage Current
CONDITIONS
CS = VCC = 5.5V, IN+ = GND
CS = VCC = 5.5V, IN= 5V
CS = VCC = 5.5V, REF+ = 5V
CS = VCC = 5.5V, REF= GND
DC
1Hz
fS = 15,3600Hz
2.7V VCC 5.5V
Channel at VCC and GND
MIN
GND – 0.3
GND – 0.3
– VREF/2
0.1
GND
0.1
–10
–10
–10
–10
70
–10
TYP MAX UNITS
VCC + 0.3
VCC + 0.3
VREF/2
V
V
V
VCC
VCC – 0.1
VCC
V
V
V
18
18
18
18
1 10
1 10
1 10
1 10
140
140
140
100 300
1 10
pF
pF
pF
pF
nA
nA
nA
nA
dB
dB
dB
ns
nA
DIGITAL I PUTS A D DIGITAL OUTPUTS The denotes specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL
VIH
VIL
VIH
VIL
IIN
IIN
CIN
CIN
VOH
PARAMETER
High Level Input Voltage
CS, FO, SDI
Low Level Input Voltage
CS, FO, SDI
High Level Input Voltage
SCK
Low Level Input Voltage
SCK
Digital Input Current
CS, FO, SDI
Digital Input Current
SCK
Digital Input Capacitance
CS, FO, SDI
Digital Input Capacitance
SCK
High Level Output Voltage
SDO
CONDITIONS
2.7V VCC 5.5V
2.7V VCC 3.3V
4.5V VCC 5.5V
2.7V VCC 5.5V
2.7V VCC 5.5V (Note 9)
2.7V VCC 3.3V (Note 9)
4.5V VCC 5.5V (Note 9)
2.7V VCC 5.5V (Note 9)
0V VIN VCC
0V VIN VCC (Note 9)
(Note 9)
IO = – 800µA
MIN
2.5
2.0
2.5
2.0
–10
TYP MAX UNITS
V
V
0.8 V
0.6 V
V
V
0.8 V
0.6 V
10 µA
–10
10 µA
10 pF
10 pF
VCC – 0.5
V
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LTC2414/LTC2418
DIGITAL I PUTS A D DIGITAL OUTPUTS The denotes specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL
VOL
VOH
VOL
IOZ
PARAMETER
Low Level Output Voltage
SDO
High Level Output Voltage
SCK
Low Level Output Voltage
SCK
Hi-Z Output Leakage
SDO
CONDITIONS
IO = 1.6mA
IO = – 800µA (Note 10)
IO = 1.6mA (Note 10)
MIN
TYP MAX UNITS
0.4 V
VCC – 0.5
V
0.4 V
–10
10 µA
POWER REQUIRE E TS The denotes specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL
VCC
ICC
PARAMETER
Supply Voltage
Supply Current
Conversion Mode
Sleep Mode
Sleep Mode
CONDITIONS
CS = 0V (Note 12)
CS = VCC (Note 12)
CS = VCC, 2.7V VCC 3.3V (Note 12)
MIN
2.7
TYP MAX UNITS
5.5 V
200 300
4 10
2
µA
µA
µA
WU
TI I G CHARACTERISTICS The denotes specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
fEOSC
tHEO
tLEO
tCONV
fISCK
DISCK
fESCK
tLESCK
tHESCK
tDOUT_ISCK
tDOUT_ESCK
External Oscillator Frequency Range
External Oscillator High Period
External Oscillator Low Period
Conversion Time
FO = 0V
FO = VCC
External Oscillator (Note 11)
Internal SCK Frequency
Internal Oscillator (Note 10)
External Oscillator (Notes 10, 11)
Internal SCK Duty Cycle
(Note 10)
External SCK Frequency Range
(Note 9)
External SCK Low Period
(Note 9)
External SCK High Period
(Note 9)
Internal SCK 32-Bit Data Output Time Internal Oscillator (Notes 10, 12)
External Oscillator (Notes 10, 11)
External SCK 32-Bit Data Output Time (Note 9)
2.56
2000
0.25
390
0.25
390
130.86 133.53 136.20
157.03 160.23 163.44
20510/fEOSC (in kHz)
19.2
fEOSC/8
45
55
2000
250
250
1.64
1.67 1.70
256/fEOSC (in kHz)
32/fESCK (in kHz)
kHz
µs
µs
ms
ms
ms
kHz
kHz
%
kHz
ns
ns
ms
ms
ms
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