Analog-to-Digital Converters suit software defined radios.

Linear Technology Corp. Dec 19, 2005

Press Release Summary:

Featuring sampling rate of 105 MS/sec, 14-bit, dual ADC Model LTC2284 delivers flat SNR response of 72.2 dB up to 70 MHz as well as SFDR of 88 dB at baseband. Models LTC2280 and LTC2282 are 10-bit and 12-bit dual ADCs also with 105 MS/sec bandwidth sampling rate. Housed in 9 x 9 mm QFN package, all devices consume 270 mW per channel, with crosstalk between channels of -110 dB. They are optimized for undersampling rates up to 140 MHz and have analog input bandwidth of 575 MHz.

Original Press Release:

LTC2284: 105Msps High Resolution, Low Power Dual ADCs Provide Migration Path for Software Defined Radios

MILPITAS, CA - December 1, 2005 - Linear Technology announces the LTC2284, a 14-bit 105Msps dual high speed ADC that delivers a flat SNR response of 72.2dB up to 70MHz, as well as SFDR of 88dB at baseband. The LTC2284 is the latest in a pin-compatible family of dual ADCs recognized for their low power, small solution size and excellent crosstalk specifications. These features, bundled with their high dynamic range performance, make these devices ideal for portable communications equipment and the latest generation of software defined radios.

The 10-bit LTC2280 and 12-bit LTC2282 105Msps dual ADCs accompany the LTC2284. Featuring a wide bandwidth sampling rate of 105Msps, these three dual ADCs expand an already extensive 3V family of 10-, 12- and 14-bit parts ranging from 10Msps up to 105Msps. Pin-compatibility offers designers more flexibility during product development and provides a fast and cost-effective upgrade path for existing designs. All three 105Msps ADCs have low power consumption of just 270mW per channel and very low crosstalk between channels of -110dB.

The LTC2284 low power family is packaged in a small 9mm x 9mm QFN package. The integrated bypass capacitance further reduces the overall solution size. The part provides the flexibility to choose between two input spans. The ADCs are optimized for undersampling of signals up to 140MHz and have a wide analog input bandwidth of 575MHz. For downconversion signal chains, Linear Technology recommends the LT5516 direct conversion quadrature demodulator and LT1993 low distortion, low noise ADC driver.

All three devices are supported with demo boards for quick device evaluation, which can be purchased online. The LTC2284, LTC2282 and LTC2280 are available today in production quantities in both commercial and industrial temperature grades and are competitively priced at $61.50, $34.50 and $11.25, respectively in 1,000-piece quantities.

In addition to the low power dual ADCs, Linear Technology offer an equivalent family of high performance single channel ADCs ranging up to 14-bit 125Msps, LTC2255. Nu Horizons offers a Virtual Lab tool at techonline.com/community/38647, where the Linear Technology LTC2249 14-bit, 80Msps single channel ADC can be evaluated interfaced to a Xilinx Spartan III FPGA.

The following provides an overview of the entire LTC2284 dual ADC product family. All parts can be ordered in optional lead-free packages for RoHS compliance. A table of the entire low power high speed product family can be found at: http://www.linear.com/designtools/hsadcs.jsp.

Part Number      Resolution       Speed       Power/Ch.        Price (1k)

LTC2284            14-bit        105Msps       270mW            $61.50

LTC2299            14-bit         80Msps       222mW            $37.50

LTC2298            14-bit         65Msps       205mW            $35.03

LTC2297            14-bit         40Msps       120mW            $27.38

LTC2296            14-bit         25Msps        75mW            $18.75

LTC2295            14-bit         10Msps        60mW            $17.00

LTC2282            12-bit        105Msps       270mW            $34.50

LTC2294            12-bit         80Msps       211mW            $25.05

LTC2293            12-bit         65Msps       205mW            $18.12

LTC2292            12-bit         40Msps       120mW            $11.88

LTC2291            12-bit         25Msps        75mW            $11.25

LTC2290            12-bit         10Msps        60mW            $11.25

LTC2280            10-bit        105Msps       270mW            $11.25

LTC2289            10-bit         80Msps       211mW            $10.05

LTC2288            10-bit         65Msps       205mW             $7.50

LTC2287            10-bit         40Msps       120mW             $7.20

LTC2286            10-bit         25Msps        75mW             $5.25

Summary of Features: LT2284
Sample Rate: 105Msps
10-bit, 12-bit, 14-bit Resolution
110dB Channel Isolation at 100MHz
Wide Analog Input Bandwidth of 575MHz
Single 3V Supply
Low Power Dissipation: 540mW
Flexible Input: 1Vp-p to 2Vp-p Range
Optional Clock Duty Cycle Stabilizer
64-Pin, 9mm x 9mm QFN Package

Media Contact
Name: Doug Dickinson
Title: Media Relations Manager
Tel: 408-432-1900 ext. 2233
E-mail: ddickinson@linear.com