Date: 14/10/2008

Six low power 12- and 14-bit ADCs with sampling rates up to 250 MSPS

Texas Instruments Incorporated introduced six 12- and 14-bit analog-to-digital converters (ADCs) with sampling rates as high as 250 MSPS (mega samples per second). The complete ADS61xx family of devices can provide wide signal bandwidth with low power consumption.
Among the six members of the ADS61xx family, the ADS6149 is the highest resolution ADC with 14-bit operation & 250-MSPS.
TI says that the ADS6149 provides 250 MSPS with 70 dB signal-to-noise ratio (SNR) and 80 dB spurious-free dynamic range (SFDR) for input frequencies ranging from DC to 250 MHz and consumes only 687 milliwatts (mW).

Some of the key features are listed below:

1. A 1- to 6-dB programmable gain option allows optimizing SNR, SFDR and input swing based on the unique needs of their application.
2. The ADS61B49 and ADS61B29 incorporate a differential input buffer, which provides constant input impedance over input frequency and eliminates kickback from the ADC's track-and-hold circuit to ensure consistent linearity of the signal.
3. The ADS61xx family features user-selectable parallel CMOS or differential double data rate (DDR) LVDS output options.

Price and spec table

Part number Speed (MSPS) Resolution Power consumption Price(1000 pieces)
ADS6149 250 MSPS 14-bit 687 mW $96.50
ADS61B49 250 MSPS 14-bit 790 mW $99.95
ADS6148 210 MSPS 14-bit 628 mW $82.50
ADS6129 250 MSPS 12-bit 687 mW $59.00
ADS61B29 250 MSPS 12-bit 790 mW $62.45
ADS6128 210 MSPS 12-bit 628 mW $45.00
Availability and packaging:
ADS6149 & ADS6129 are available in 7-mm x 7-mm, 48-pin QFN package.
The remaining four members of the family will release to production over the remainder of 2008.