Fast ADCs cut power for 12- and 14-bit data capture
The ADC3k family includes 12- and 14-bit options in speed grades of up to 160 Msamples/sec with 2 or 4 channels and with LVDS or JESD204B interfaces. The devices support the industrial ambient temperature range of -40C to 85C for use in industrial applications, such as motor control, medical imaging, and portable test and measurement, as well as defence and communications applications, such as software defined radio and MIMO communications.
TI presents the devices as leading in power consumption and power-to-performance ratio: At the fastest sampling rate of 160 Msample/sec, the devices use only 200 mW/ch, 80 mW/ch less than similar devices, and provide a 30% better power-to-performance ratio. Power scales to 44 mW/ch at 25 Msample/sec. An extensive pin-compatible family scales to meet multi-platform system needs for various sampling rates and channel counts. These 4-channel, 160-MSPS devices are half the size of existing devices.
Simpler board routing comes with JESD204B variants that are compliant with subclass 0, 1, and 2 at up to 3.2 Gbps. They support one lane per ADC output up to 160 Msample/sec, and one lane per two ADCs for up to 80 Msample/sec. Optional dither and chopper functions can improve spurious free dynamic range (SFDR) and remove 1/f noise, which allows designers to optimise device performance to meet system needs.
next; system configurations...
A related part, the THS4541 is the lowest power consumption rail-to-rail output, fully differential amplifier capable of 850-MHz gain bandwidth (GBW). It enables system designers to maximise the performance of their ADC3k device. The THS4541’s harmonic distortion performance of 123/-130 dBc HD2/HD3 at 1 MHz enables a fully differential AC- or DC-coupled solution for greater flexibility while enhancing the performance of the ADC3k device. When combined, the devices also provide ultra-low power and the smallest analogue front end solution at their performance levels.
A TI Designs reference design (TIDA-00294) is available for high-speed signal acquisition system design. The high-performance, single-ended-to-differential active interface design includes the 12-bit, 4-channel, 50-MSPS ADC34J22 ADC and THS4541. It is optimised for DC-coupled, single-ended input applications, such as motor control, medical imaging, and portable test and measurement. Engineers can use the design methodology for any device in the ADC3k family.
System designers can pair JESD204B and LVDS ADC3k evaluation modules (EVMs) with the TSW14J50EVM and TSW1405EVM pattern generator and data capture card, respectively, for a low-cost evaluation system.
For designers using Altera’s Cyclone V SOC FPGA, Dallas Logic has developed a 4-channel, 12-bit, 50-MSPS ADC module that integrates with Altera’s High Speed Mezzanine Card (HSMC) standard. The DEV-ADC34J22 features the ADC34J22 and THS4541, along with TI’s LMK04828 clock jitter cleaner, and provides single-ended DC-coupled inputs on two of the four channels. The module is available from Arrow for $199.
The ADC3k family will include 32 pin-compatible devices by the end of 2015 with speed grades ranging from 25 Msample/sec to 160 Msample/sec. The family comes in a 7 x 7-mm QFN package with the exception of the 4-channel LVDS versions, which use an 8 x 8-mm QFN. Follow the links in the panel for more information.
|
Device |
Speed |
Resolution |
Channel |
Interface |
Price* |
Availability |
EVM** |
|
160 MSPS |
14 bit |
4 |
JESD204B |
US$120.75 |
Now |
||
|
160 MSPS |
14 bit |
2 |
JESD204B |
US$61.25 |
Samples now, 1H15 production |
||
|
160 MSPS |
12 bit |
4 |
JESD204B |
US$72.15 |
Samples now; 1H15 production |
||
|
125 MSPS |
14 bit |
4 |
JESD204B |
US$117.00 |
Samples now; 4Q14 production |
||
|
125 MSPS |
14 bit |
4 |
LVDS |
US$117.00 |
Samples now; 1H15 production |
||
|
125 MSPS |
14 bit |
2 |
LVDS |
US$41.00 |
Samples now; 2H15 production |
||
|
125 MSPS |
12 bit |
4 |
LVDS |
US$68.60 |
Samples now; 1H15 production |
||
|
125 MSPS |
12 bit |
2 |
LVDS |
US$29.50 |
Samples now; 2H15 production |
||
|
50 MSPS |
12 bit |
4 |
JESD204B |
US$23.95 |
Samples now, 1H15 production |
Texas Instruments; www.ti.com/adc3k-pr-eu
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