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LTC2372-18
18-Bit, 500ksps, 8-Channel
SAR ADC with 100dB SNR
Features
n 500ksps Throughput Rate
n 18-Bit Resolution with No Missing Codes
n 8-Channel Multiplexer with Selectable Input Range
n Fully Differential (±4.096V)
n Pseudo-Differential Unipolar (0V to 4.096V)
n Pseudo-Differential Bipolar (±2.048V)
n INL: ±2.75LSB (Maximum)
n SNR: 100dB (Fully Differential)/95dB (Pseudo-
Differential) (Typical) at fIN = 1kHz
n THD: –110dB (Typical) at fIN = 1kHz
n Programmable Sequencer
n Selectable Digital Gain Compression
n Single 5V Supply with 1.8V to 5V I/O Voltages
n SPI-Compatible Serial I/O
n Onboard 2.048V Reference and Reference Buffer
n No Pipeline Delay, No Cycle Latency
n Power Dissipation 27mW (Typical)
n Guaranteed Operation to 125°C
n 32-Lead 5mm × 5mm QFN Package
Applications
n Programmable Logic Controllers
n Industrial Process Control
n High Speed Data Acquisition
n Portable or Compact Instrumentation
n ATE
Description
The LTC®2372-18 is a low noise, high speed, 8-channel
18-bit successive approximation register (SAR) ADC. Oper-
ating from a single 5V supply, the LTC2372-18 has a highly
configurable, low crosstalk 8-channel input multiplexer,
supporting fully differential, pseudo-differential unipolar
and pseudo-differential bipolar analog input ranges. The
LTC2372-18 achieves ±2.75LSB INL (maximum) in all
input ranges, no missing codes at 18-bits and 100dB (fully
differential)/ 95dB (pseudo-differential) SNR (typical).
The LTC2372-18 has an onboard low drift (20ppm/°C max)
2.048V temperature-compensated reference and a single-
shot capable reference buffer. The LTC2372-18 also has a
high speed SPI-compatible serial interface that supports
1.8V, 2.5V, 3.3V and 5V logic through which a sequencer
with a depth of 16 may be programmed. An internal os-
cillator sets the conversion time, easing external timing
considerations. The LTC2372-18 dissipates only 27mW
and automatically naps between conversions, leading to
reduced power dissipation that scales with the sampling
rate. A sleep mode is also provided to reduce the power
consumption of the LTC2372-18 to 300μW for further
power savings during inactive periods.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673.
Typical Application
4.096V
0V
0V
4.096V
0V
4.096V
0V
4.096V
0V
2.048V
10Ω
+ 1200pF
10Ω 1200pF
5V
10µF
2.2µF
1.8V TO 5V
0.1µF
CH0
CH1
CH2
CH3
CH4
MUX
CH5
CH6
CH7
COM
VDD VDDLBYP OVDD
LTC2372-18
RESET
RDL
+ 18-BIT
–SAMPLING ADC
REFBUF REFIN GND
SDO
SCK
SDI
BUSY
CNV
47µF 0.1µF
237218 TA01a
SAMPLE
CLOCK
For more information www.linear.com/LTC2372-18
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
Integral Nonlinearity
vs Output Code
FULLY DIFFERENTIAL
BIPOLAR
UNIPOLAR
65536 131072 196608 262144
OUTPUT CODE
2372 TA01b
237218f
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LTC2372-18
Absolute Maximum Ratings
(Notes 1, 2)
Supply Voltage (VDD).................................................. 6V
Supply Voltage (OVDD)................................................ 6V
Analog Input Voltage (Note 3)
CH0 to CH7, COM......... (GND – 0.3V) to (VDD + 0.3V)
REFBUF........................ (GND – 0.3V) to (VDD + 0.3V)
REFIN....................................................................... 2.8V
Digital Input Voltage
(Note 3)............................(GND –0.3V) to (OVDD + 0.3V)
Digital Output Voltage
(Note 3)............................(GND –0.3V) to (OVDD + 0.3V)
Power Dissipation............................................... 500mW
Operating Temperature Range
LTC2372C.................................................0°C to 70°C
LTC2372I..............................................–40°C to 85°C
LTC2372H...........................................–40°C to 125°C
Storage Temperature Range...................–65°C to 150°C
Pin Configuration
TOP VIEW
32 31 30 29 28 27 26 25
CH2 1
24 RESET
CH3 2
MUXOUT+ 3
ADCIN+ 4
ADCIN5
MUXOUT6
23 GND
22 SDO
33 21 SCK
20 SDI
19 BUSY
CH4 7
18 RDL
CH5 8
17 GND
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 44°C/W
EXPOSED PAD IS GND (PIN 33) MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2372CUH-18#PBF
LTC2372CUH-18#TRPBF 237218
32-Lead (5mm × 5mm) Plastic QFN
0°C to 70°C
LTC2372IUH-18#PBF
LTC2372IUH-18#TRPBF 237218
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC2372HUH-18#PBF
LTC2372HUH-18#TRPBF 237218
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
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/
237218f
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LTC2372-18
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN+ Absolute Input Range (CH0 to CH7)
VIN–
Absolute Input Range
(CH0 to CH7, COM)
VIN+ – VIN– Input Differential Voltage Range
VCM Common Mode Input Range
IIN Analog Input Leakage Current
CIN Analog Input Capacitance
(Note 5)
Fully Differential (Note 5)
Pseudo-Differential Unipolar (Note 5)
Pseudo-Differential Bipolar (Note 5)
Fully Differential
Pseudo-Differential Unipolar
Pseudo-Differential Bipolar
Pseudo-Differential Bipolar and
Fully Differential (Note 6)
Sample Mode
Hold Mode
l –0.1
VREFBUF + 0.1
l –0.1
l –0.1
0 VREFB0U.F1+ 0.1
l VREFBUF/2 – 0.1 VREFBUF/2 VREFBUF/2 + 0.1
l –VREFBUF
l0
l –VREFBUF/2
VREFBUF
VREFBUF
VREFBUF/2
l –VREFBUF/2 – 0.1 VREFBUF/2 VREFBUF/2 + 0.1
l –1
1
75
5
V
V
V
V
V
V
V
V
µA
pF
pF
CMRR
Input Common Mode Rejection Ratio Fully Differential, fIN = 250kHz
Pseudo-Differential Unipolar, fIN = 250kHz
Pseudo-Differential Bipolar, fIN = 250kHz
71 dB
72 dB
73 dB
Converter Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Resolution
l 18
Bits
No Missing Codes
l 18
Bits
Transition Noise
INL Integral Linearity Error
Fully Differential
Pseudo-Differential Unipolar
Pseudo-Differential Bipolar
Fully Differential (Note 7)
Pseudo-Differential Unipolar (Note 7)
Pseudo-Differential Bipolar (Note 7)
0.85 LSBRMS
1.5 LSBRMS
1.5 LSBRMS
l –2 ±0.5 2
l –2.75 ±0.8 2.75
l –2.75 ±0.8 2.75
LSB
LSB
LSB
DNL Differential Linearity Error
Fully Differential (Note 6)
Pseudo-Differential Unipolar (Note 6)
Pseudo-Differential Bipolar (Note 6)
l –0.9 ±0.25 0.9
l –0.9 ±0.25 0.9
l –0.9 ±0.25 0.9
LSB
LSB
LSB
ZSE Zero-Scale Error
Fully Differential (Note 8)
Pseudo-Differential Unipolar (Note 8)
Pseudo-Differential Bipolar (Note 8)
l –15 ±2 15
l –30 ±2 30
l –30 ±2 30
LSB
LSB
LSB
Zero-Scale Error Drift
Fully Differential
Pseudo-Differential Unipolar
Pseudo-Differential Bipolar
20 mLSB/°C
30 mLSB/°C
30 mLSB/°C
Zero-Scale Error Match
Fully Differential
Pseudo-Differential Unipolar
Pseudo-Differential Bipolar
l –18 ±2 18
l –24 ±4 24
l –28 ±4 28
LSB
LSB
LSB
FSE Full-Scale Error
Fully Differential
REFBUF = 4.096V (REFBUF Overdriven) (Notes 8, 9)
REFIN = 2.048V (REFIN Overdriven) (Note 8)
Pseudo-Differential Unipolar
REFBUF = 4.096V (REFBUF Overdriven) (Notes 8, 9)
REFIN = 2.048V (REFIN Overdriven) (Note 8)
Pseudo-Differential Bipolar
REFBUF = 4.096V (REFBUF Overdriven) (Notes 8, 9)
REFIN = 2.048V (REFIN Overdriven) (Note 8)
l –50 ±7 50
l –100 ±11 100
l –75 ±5 75
l –200 ±14 200
l –50 ±8 50
l –120 ±12 120
LSB
LSB
LSB
LSB
LSB
LSB
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LTC2372-18
C onverter Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Full-Scale Error Drift
Fully Differential
REFBUF = 4.096V (REFBUF Overdriven) (Note 9)
Pseudo-Differential Unipolar
REFBUF = 4.096V (REFBUF Overdriven) (Note 9)
Pseudo-Differential Bipolar
REFBUF = 4.096V (REFBUF Overdriven) (Note 9)
0.2 ppm/°C
0.2 ppm/°C
0.2 ppm/°C
Full-Scale Error Match
Fully Differential
REFBUF = 4.096V (REFBUF Overdriven) (Note 9)
Pseudo-Differential Unipolar
REFBUF = 4.096V (REFBUF Overdriven) (Note 9)
Pseudo-Differential Bipolar
REFBUF = 4.096V (REFBUF Overdriven) (Note 9)
l –18 ±2 18
l –24 ±4 24
l –28 ±4 28
LSB
LSB
LSB
Dynamic Accuracy The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C and AIN = –1dBFS. (Notes 4, 10)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SINAD
SNR
Signal-to-(Noise + Distortion) Ratio
Signal-to-Noise Ratio
Fully Differential
PfINse=ud1okH-Dzi,ffReEreFnINtia=l
2.048V (REFIN
Unipolar
Overdriven)
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven)
Pseudo-Differential Bipolar
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven)
Fully Differential
fPINse=ud1okH-Dzi,ffReEreFnBtUiaFl
= 5V (REFBUF
Unipolar
Overdriven)
(Note
9)
fIN = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9)
Pseudo-Differential Bipolar
fIN = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9)
Fully Differential
PfINse=ud1okH-Dzi,ffReEreFnINtia=l
2.048V
Bipolar
(REFIN
Overdriven),
SEL
=
1
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1
Fully Differential
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven)
Pseudo-Differential Unipolar
fPINse=ud1okH-Dzi,ffReEreFnINtia=l
2.048V
Bipolar
(REFIN
Overdriven)
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven)
Fully Differential
fIN = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9)
Pseudo-Differential Unipolar
fPINse=ud1okH-Dzi,ffReEreFnBtUiaFl
= 5V (REFBUF
Bipolar
Overdriven)
(Note
9)
fIN = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9)
Fully Differential
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1
Pseudo-Differential Bipolar
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1
l 96
l 90.5
l 90.5
l 96.5
l 91
l 91
99.8
94.9
94.9
101.5
96.6
96.6
98.3
93.3
100
95
95
102
96.8
96.8
98.5
93.4
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
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LTC2372-18
Dynamic Accuracy The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C and AIN = –1dBFS. (Notes 4, 10)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
THD Total Harmonic Distortion
SFDR
Spurious Free Dynamic Range
Channel-to-Channel Crosstalk
–3dB Input Linear Bandwidth
Fully Differential
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven)
Pseudo-Differential Unipolar
fPINse=ud1okH-Dzi,ffReEreFnINtia=l
2.048V
Bipolar
(REFIN
Overdriven)
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven)
l
l
l
Fully Differential
fIN = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9)
Pseudo-Differential Unipolar
fPINse=ud1okH-Dzi,ffReEreFnBtUiaFl
= 5V (REFBUF
Bipolar
Overdriven)
(Note
9)
fIN = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9)
Fully Differential
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1
Pseudo-Differential Bipolar
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1
Fully Differential
fPINse=ud1okH-Dzi,ffReEreFnINtia=l
2.048V (REFIN
Unipolar
Overdriven)
fPINse=ud1okH-Dzi,ffReEreFnINtia=l
2.048V
Bipolar
(REFIN
Overdriven)
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven)
l 104
l 99
l 99
Fully Differential
fPINse=ud1okH-Dzi,ffReEreFnBtUiaFl
= 5V (REFBUF
Unipolar
Overdriven)
(Note
9)
fPINse=ud1okH-Dzi,ffReEreFnBtUiaFl
= 5V (REFBUF
Bipolar
Overdriven)
(Note
9)
fIN = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9)
Fully Differential
PfINse=ud1okH-Dzi,ffReEreFnINtia=l
2.048V
Bipolar
(REFIN
Overdriven),
SEL
=
1
fIN = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1
fIN = 100kHz, Signal Applied to an OFF Channel
–114 –104
–110 –99
–110 –99
–111
–110
–110
–113
–110
114
110
110
112
112
112
112.5
113.5
–107
22
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
MHz
Aperture Delay
500 ps
Aperture Jitter
Transient Response
Full-Scale Step
4 psRMS
0.5 µs
I nternal Reference Characteristics The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VREFIN
Internal Reference Output Voltage
VREFIN Temperature Coefficient
REFIN Output Impedance
(Note 11)
2.043
l
2.048
4
15
2.053
20
V
ppm/°C
VREFIN Line Regulation
REFIN Input Voltage Range
VDD = 4.75V to 5.25V
(REFIN Overdriven) (Note 5)
0.06
1.25
2.4
mV/V
V
For more information www.linear.com/LTC2372-18
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