Breakthrough 0.5ppm INL, 1Msps, No Latency SAR ADC Achieves True 20-Bit Precision

News Release ⎜
Breakthrough 0.5ppm INL, 1Msps, No Latency SAR ADC
Achieves True 20-Bit Precision
MILPITAS, CA – May 28, 2013 – Linear Technology Corporation introduces the LTC2378-20,
a 20-bit 1Msps no latency successive approximation register (SAR) analog-to-digital converter
(ADC) with exceptionally low 0.5ppm (typ) and 2ppm (max) Integral Non-Linearity (INL) error.
INL is a key specification in precision applications, such as seismic monitoring and
semiconductor fabrication, indicating how much the ADC transfer function deviates from its
ideal. Since linearity effectively cannot be calibrated at the system level, the ADC’s INL
specification often sets the overall system accuracy. The best-in-class 0.5ppm INL of the
LTC2378-20 enables a new generation of precision systems with true 20-bit accuracy. The
proprietary architecture leads to an extremely stable 2ppm (max) INL and -114dB THD (max)
over the device’s entire operating range of -40°C to 85°C.
The LTC2378-20 achieves the industry’s highest signal-to-noise ratio (SNR) of 104dB
for a 1Msps no latency ADC. The wide dynamic range and true 20-bit resolution reduce or
eliminate the need for additional gain in the signal chain, thereby improving total system
accuracy and noise. Fast 1Msps throughput with no latency enables the use of multiplexers to
replace costly, independent ADCs with slower throughputs, thus reducing system cost and
The LTC2378-20 is the leadership product in a pin- and software-compatible family of
20/18/16-bit SAR ADCs with speeds ranging from 250ksps up to 2Msps with serial SPI
interfaces. The 20-bit 250ksps (LTC2376-20) and 500ksps (LTC2377-20) versions will be
released in May. The family operates from a 2.5V supply, with a ±5V fully differential input
range using an external 5V reference. At 1Msps, the device achieves low power dissipation of
21mW, which scales linearly with sample rate. A shutdown mode further reduces power
dissipation to 2.5μW when idle. The LTC2378-20 family offers a unique digital gain
compression (DGC) feature, eliminating the need for a negative ADC driver supply and
Breakthrough 0.5ppm INL, 1Msps, No Latency SAR ADC
Achieves True 20-Bit Precision
Page 3
preserving the full resolution of the ADC, to achieve lower total power consumption of the signal
chain with only a small reduction in SNR performance.
The DC1925A evaluation kit demonstrates the 0.5ppm INL and 104dB SNR performance
of the LTC2378-20. The board features the flexible LT6203 ADC driver for interfacing
differential or single-ended input signals and the 5V LTC6655-5 precision, low noise, low power
reference. For a truly low power signal chain solution using the digital gain compression feature,
we recommend the LTC6362 fully differential driver operating from a single 5V supply (1mA),
which achieves up to 100dB SNR performance when combined with the LTC2378-20 and the
4.096V LTC6655-4.096 reference.
The LTC2378-20, LTC2377-20 and the LTC2376-20 are available in small MSOP-16
and 4mm x 3mm DFN-16 packages, priced starting at $29.50, $25.50 and $18.17 each,
respectively, in 1,000 piece quantities. For more information, visit
Photo Caption: 20-Bit No-Latency Serial SAR ADC with 1Msps Throughput & 0.5ppm INL
Summary of Features: LTC2378-20
1Msps Throughput Rate
±0.5ppm INL (Typ), ±2ppm INL (Max)
Guaranteed 20-Bit No Missing Codes
Low Power: 21mW at 1Msps, 21μW at 1ksps
104dB SNR (Typ) at fIN = 2kHz
–125dB THD (Typ) at fIN = 2kHz
Digital Gain Compression (DGC)
Guaranteed Operation to 85°C
2.5V Supply
Fully Differential Input Range ±VREF
VREF 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 & 4mm × 3mm DFN Packages
Breakthrough 0.5ppm INL, 1Msps, No Latency SAR ADC
Achieves True 20-Bit Precision
Page 3
About Linear Technology
Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing
and marketing a broad line of high performance analog integrated circuits for major companies
worldwide for three decades. The Company’s products provide an essential bridge between our
analog world and the digital electronics in communications, networking, industrial, automotive,
computer, medical, instrumentation, consumer, and military and aerospace systems. Linear
Technology produces power management, data conversion, signal conditioning, RF and interface
ICs, µModule®subsystems, and wireless sensor network products. For more information, visit
, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of Linear
Technology Corp. All other trademarks are the property of their respective owners.
Press Contacts:
North America / Worldwide
UK & Nordic
John Hamburger, Director Marketing
[email protected]
Tel: 408-432-1900 ext 2419
Alan Timmins
[email protected]
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
[email protected]
Tel: 408-432-1900 ext 2233