LTC2378-16
16-Bit, 1Msps, Low Power
SAR ADC with 97dB SNR
FeaTures
DescripTion
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1Msps Throughput Rate
The LTC®2378-16 is a low noise, low power, high speed
16-bit successive approximation register (SAR) ADC. Op-
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±±0.5Sꢀ IN5 ꢁMaꢂx
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Guaranteed 16-ꢀit No Missing Codes
erating from a 2.5V supply, the LTC2378-16 has a ±V
fully differential input range with V ranging from 2.5V
to 5.1V. The LTC2378-16 consumes only 13.5mW and
achieves ±±.5LSꢀ INL maximum, no missing codes at
16 bits with 97dꢀ SNR.
REF
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5ow Power: 130.mW at 1Msps, 130.µW at 1ksps
97dꢀ SNR ꢁTypx at f = 2kHz
–122dꢀ THD ꢁTypx at f = 2kHz
REF
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IN
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IN
Digital Gain Compression ꢁDGCx
Guaranteed Operation to 125°C
2.5V Supply
The LTC2378-16 has a high speed SPI-compatible serial
interface that supports 1.8V, 2.5V, 3.3V and 5V logic
while also featuring a daisy-chain mode. The fast 1Msps
throughput with no cycle latency makes the LTC2378-16
ideally suited for a wide variety of high speed applications.
Aninternaloscillatorsetstheconversiontime,easingexter-
nal timing considerations. The LTC2378-16 automatically
powers down between conversions, leading to reduced
power dissipation that scales with the sampling rate.
Fully Differential Input Range ±V
REF
V
Input Range from 2.5V to 5.1V
REF
No Pipeline Delay, No Cycle Latency
1.8V to 5V I/O Voltages
SPI-Compatible Serial I/O with Daisy-Chain Mode
Internal Conversion Clock
16-Lead MSOP and 4mm × 3mm DFN Packages
applicaTions
The LTC2378-16 features a unique digital gain compres-
sion(DGC)function,whicheliminatesthedriveramplifier’s
negative supply while preserving the full resolution of the
ADC. When enabled, the ADC performs a digital scaling
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Medical Imaging
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High Speed Data Acquisition
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Portable or Compact Instrumentation
function that maps zero-scale code from ±V to ±.1 • V
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REF
Industrial Process Control
and full-scale code from V
to ±.9 • V . For a typical
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REF
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Low Power ꢀattery-Operated Instrumentation
reference voltage of 5V, the full-scale input range is now
±.5V to 4.5V, which provides adequate headroom for
powering the driving amplifier from a single 5.5V supply.
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ATE
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.
Typical applicaTion
32k Point FFT fS = 1Msps, fIN = 2kHz
2.5V 1.8V TO 5V
0
SNR = 97.2dB
–20
–40
THD = –121.7dB
SINAD = 97.1dB
SFDR = 128dB
10µF
0.1µF
V
OV
DD
CHAIN
RDL/SDI
SDO
DD
6800pF
3300pF
6800pF
V
V
REF
20Ω
20Ω
–60
+
–
IN
+
–
–80
0V
LTC2378-16
SCK
REF
BUSY
CNV
REF/DGC
–100
–120
–140
–160
–180
IN
SAMPLE CLOCK
0V
V
REF
REF
GND
REF
237816 TA01
2.5V TO 5.1V
47µF
(X5R, 0805 SIZE)
0
100
200
300
400
500
FREQUENCY (kHz)
237816 TA02
237816fa
1
For more information www.linear.com/LTC2378-16
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