Analogue, Mixed Signal, LSI


105 MSps ADC with unique serial interface

12 November 2008 Analogue, Mixed Signal, LSI

Linear Technology introduced a 16-bit, 105 MSps ADC that employs an innovative approach to digital communication between high speed ADCs and FPGAs. The LTC2274’s high-speed 2-wire serial interface greatly reduces the number of data input/output (I/O) lines required between a 16-bit ADC and the FPGA from 16 CMOS or 32 LVDS parallel data lines to a single, self-clocking, differential pair communicating at 2,1 Gbps, freeing up valuable FPGA pins.

Serial data communications offers simplified layout, and requires less board area for routing, while providing the flexibility to route across analog and digital boundaries. In noise-sensitive applications, the serial interface provides an effective isolation barrier between digital and analog circuitry and serves to eliminate coupling between digital outputs to reduce digital feedback.

The LTC2274 output data is serialised according to the JEDEC serial interface specification for data converters (JESD204) using 8b10b encoding, and is compatible with many FPGA high speed interfaces including Xilinx’s Rocket IO, Altera’s Stratix II GX I/O and Lattice’s ECP2M I/O. Applications such as leading edge communications equipment, multichannel systems, space-constrained designs and instrumentation can all benefit from the LTC2274’s unique interface and feature set.

The device offers several unique features to improve overall system design. For high-sensitivity receiver applications, it provides an internal transparent dither circuit that improves the ADC’s SFDR response well beyond 100 dBc for low-level input signals. To avoid any interference from the serial digital outputs, an optional data scrambler is available to randomise the spectrum of the serial link. Serial test patterns are also incorporated to facilitate testing of the serial interface.

While the LTC2274 may be operated at a maximum sampling rate of 105 MSps, the internal PLL may be configured to lock at one of three different sample rate ranges. An on-chip clock duty cycle stabiliser circuit has been implemented to facilitate non-50% clock duty cycles. Separate shutdown pins for the analog and digital sections are provided to conserve power.

The LTC2274 offers signal to noise ratio (SNR) performance of 77,5 dB and spurious free dynamic range (SFDR) of 100 dB at baseband. Ultra-low jitter of 80 fs RMS enables under-sampling of input frequencies up to 500 MHz with excellent noise performance.



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Enabling cloud connectivity to all Microchip MCUs and MPUs
25 March 2020, Avnet South Africa , DSP, Micros & Memory
Due to the fragmented nature of the Internet of Things (IoT) marketplace, increasing project complexity and costs, today’s developers face more challenges in design decisions than ever before. These challenges ...

Read more...
Stackable DC-DC buck converter
29 April 2020, Avnet South Africa , Power Electronics / Power Management
Texas Instruments introduced a new 40 A SWIFT DC-DC buck converter, offering first-of-its-kind stackability of up to four ICs. The TPS546D24A PMBus buck converter can deliver up to 160 A of output current ...

Read more...
Versatile temperature sensor IC
25 March 2020 , Analogue, Mixed Signal, LSI
Although the WSEN-TIDS temperature sensor from Würth Elektronik measures just 2,0 x 2,0 x 0,5 mm, its range of application is wide. Its accuracy in the measuring range -40°C to 125°C is ±0,5°C, while ...

Read more...
Guide for designing GUIs, for novices to experts
29 April 2020, Avnet South Africa , Design Automation
The TouchGFX team at STMicroelectronics recently published TouchGFX Documentation, a website that targets developers working on their first embedded graphical user interface (GUI) as well as those with ...

Read more...
Why low quiescent current matters for longer battery life
29 April 2020, Avnet South Africa , Power Electronics / Power Management
From healthcare and biosensing to wearables and environmental sensing, nearly all IoT devices rely on batteries that must perform reliably and over an extended period of time in a variety of conditions.

Read more...
IMUs that carry machine learning burden
29 April 2020, Altron Arrow , Analogue, Mixed Signal, LSI
Designed for use in a wide variety of consumer and industrial applications, STMicroelectronics’ 6-axis iNEMO inertial measurements units (IMU) feature an embedded machine learning core (MLC) to offload ...

Read more...
Versatile temperature sensor IC
29 April 2020 , Analogue, Mixed Signal, LSI
Although the WSEN-TIDS temperature sensor from Würth Elektronik measures just 2,0 x 2,0 x 0,5 mm, its range of application is wide. Its accuracy in the measuring range -40°C to 125°C is ±0,5°C, while ...

Read more...
ADC for harsh industrial environments
25 March 2020, Altron Arrow , Analogue, Mixed Signal, LSI
The ADC120 is a low-power, eight-channel pure CMOS 12-bit analog-to-digital converter (ADC) specified for conversion from 50 KSps to 1 MSps, tested at 1 MSps. The architecture is based on a successive-approximation ...

Read more...
MEMS-based environmental pressure sensors
25 March 2020, Avnet South Africa , Analogue, Mixed Signal, LSI
Bourns Sensors & Controls’ product line is introducing four new series of environmental sensors based on microelectromechanical systems (MEMS) technology. These four new series are designed for the customer ...

Read more...
Bluetooth 5.0 Low Energy module
25 March 2020, Avnet South Africa , Telecoms, Datacoms, Wireless, IoT
An output power of up to +8 dBm and the high sensitivity of the nRF52840, in combination with the LE coded PHY, make the module very attractive for applications that require a long range. The Bluetooth ...

Read more...