FeaTures
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LTC2378-16
16-Bit, 1Msps, Low Power
SAR ADC with 97dB SNR
DescripTion
The LTC
®
2378-16 is a low noise, low power, high speed
16-bit successive approximation register (SAR) ADC. Op-
erating from a 2.5V supply, the LTC2378-16 has a ±V
REF
fully differential input range with V
REF
ranging from 2.5V
to 5.1V. The LTC2378-16 consumes only 13.5mW and
achieves ±0.5LSB INL maximum, no missing codes at
16 bits with 97dB SNR.
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 through-
put with no cycle latency makes the LTC2378-16 ideally
suited for a wide variety of high speed applications. An
internal oscillator sets the conversion time, easing external
timing considerations. The LTC2378-16 automatically pow-
ers down between conversions, leading to reduced power
dissipation that scales with the sampling rate.
The LTC2378-16 features a unique digital gain compres-
sion (DGC) function, which eliminates the driver amplifier’s
negative supply while preserving the full resolution of the
ADC. When enabled, the ADC performs a digital scaling
function that maps zero-scale code from 0V to 0.1 • V
REF
and full-scale code from V
REF
to 0.9 • V
REF
. For a typical
reference voltage of 5V, the full-scale input range is now
0.5V to 4.5V, which provides adequate headroom for
powering the driving amplifier from a single 5.5V supply.
1Msps Throughput Rate
±0.5LSB INL (Max)
Guaranteed 16-Bit No Missing Codes
Low Power: 13.5mW at 1Msps, 13.5µW at 1ksps
97dB SNR (Typ) at f
IN
= 2kHz
–122dB
THD (Typ) at f
IN
= 2kHz
Digital Gain Compression (DGC)
Guaranteed Operation to 125°C
2.5V Supply
Fully Differential Input Range ±V
REF
V
REF
Input Range from 2.5V to 5.1V
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
Medical Imaging
High Speed Data Acquisition
Portable or Compact Instrumentation
Industrial Process Control
Low Power Battery-Operated Instrumentation
ATE
applicaTions
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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
2.5V
10µF
V
REF
0V
V
REF
0V
6800pF
3300pF
V
DD
IN
+
1.8V TO 5V
0.1µF
OV
DD
CHAIN
RDL/SDI
SDO
SCK
BUSY
CNV
REF/DGC
237816 TA01
32k Point FFT f
S
= 1Msps, f
IN
= 2kHz
0
–20
–40
SNR = 97.2dB
THD = –121.7dB
SINAD = 97.1dB
SFDR = 128dB
+
–
20
AMPLITUDE (dBFS)
–60
–80
–100
–120
–140
–160
–180
0
100
200
300
FREQUENCY (kHz)
400
500
237816f
LTC2378-16
IN
–
REF
2.5V TO 5.1V
GND
20
6800pF
SAMPLE CLOCK
V
REF
47µF
(X5R, 0805 SIZE)
237816 TA02
1
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
