Summary of TI unveils its fastest 16-bit DAC, sampling at 1.5GS/s
The DAC34SH84 is a quad-channel, 16-bit digital-to-analog converter offering 1.5 GSPS sampling with low power consumption of 1.8 W. It features on-chip interpolation filters (2x to 16x), independent complex mixers with NCOs, and digital IQ correction for high dynamic range applications. Designed for industrial temperatures (-40°C to 85°C), it uses a 32-bit LVDS interface and includes safety checks like parity testing. This device serves as an upgrade for LTE and WiMAX basestations, available in a compact BGA package.
Parts used in the DAC34SH84 Project:
- DAC34SH84 Quad-Channel 16-bit DAC
- Transformer-Coupled IF Outputs
- Digital Interpolation Filters (2x to 16x)
- Independent Complex Mixers
- 32-Bit Numerically Controlled Oscillators (NCOs)
- Low-Jitter Clock-Multiplying PLL
- Digital Quadrature Modulator Correction (QMC)
- 32-Bit DDR Flexible LVDS Input Data Bus
- 8-Sample Input FIFO
- Data Pattern Checker
- Parity Check Circuit
- Temperature Sensor
- TRF3705 IQ Modulators
- DAC34SH84EVM Evaluation Module
Description
The DAC34SH84 is a very low-power, high-dynamic range, quad-channel, 16-bit digital-to-analog converter (DAC) with a sample rate as high as 1.5 GSPS.
The device includes features that simplify the design of complex transmit architectures: 2× to 16× digital interpolation filters with over 90 dB of stop-band attenuation simplify the data interface and reconstruction filters. Independent complex mixers allow flexible carrier placement. A high-performance low-jitter clock multiplier simplifies clocking of the device without significant impact on the dynamic range. The digital quadrature modulator correction (QMC) enables complete IQ compensation for gain, offset and phase between channels in direct upconversion applications.
Digital data is input to the device through a 32-bit wide LVDS data bus with on-chip termination. The wide bus allows the processing of high-bandwidth signals. The device includes a FIFO, data pattern checker, and parity test to ease the input interface. The interface also allows full synchronization of multiple devices.
The device is characterized for operation over the entire industrial temperature range of –40°C to 85°C and is available in a 196-ball, 12-mm × 12-mm, 0.8-mm pitch BGA package.
The DAC34SH84 low-power, high-bandwidth support, superior crosstalk, high dynamic range, and features are an ideal fit for next-generation communication systems.
Features
- Low Power: 1.8 W at 1.5 GSPS, Full Operating Condition
- Multi-DAC Synchronization
- Selectable 2×, 4×, 8×, 16× Interpolation Filter
- Stop-Band Attenuation > 90 dBc
- Flexible On-Chip Complex Mixing
- Two Independent Fine Mixers With 32-Bit NCOs
- Power-Saving Coarse Mixers: ±n × fS /8
- High-Performance, Low-Jitter Clock-Multiplying PLL
- Digital I and Q Correction
- Gain, Phase and Offset
- Digital Inverse Sinc Filters
- 32-Bit DDR Flexible LVDS Input Data Bus
- 8-Sample Input FIFO
- Supports Data Rates up to 750 MSPS
- Data Pattern Checker
- Parity Check
- Temperature Sensor
Texas Instruments has introduced its fastest 16-bit digital-to-analogue converter (DAC).
The quad DAC34SH84 samples at 1.5GS/s with power consumption of 362mW per channel.
TI is offering it as a pin-compatible upgrade from the 1.25-GSPS DAC34H84 for LTE, GSM and WiMAX wireless basestations.
A 750MS/s-per-DAC input rate supports up to 600MHz complex bandwidth for fifth order linearization of 120MHz.
There is 2x to 16x interpolation and two independent, 32-bit numerically controlled oscillators which lower the interface rate of associated FPGAs.
On-chip calibration of complete RF transmit path suppresses sideband and local oscillator feed-through while driving IQ modulators, such as the new TRF3705.
- The DAC34SH84EVM evaluation module can be purchased today for US$499. It includes transformer-coupled IF outputs to evaluate the DAC34SH84 directly.
The DAC34SH84 is sampling now in a small 12-mm x 12-mm BGA package. Production quantities are expected in 2Q 2012.
For more read: TI unveils its fastest 16-bit DAC, sampling at 1.5GS/s
- What is the maximum sample rate of the DAC34SH84?
The device samples at a rate as high as 1.5 GSPS. - How much power does the DAC34SH84 consume at full operating condition?
The device consumes 1.8 W at 1.5 GSPS under full operating conditions. - Can the DAC34SH84 be synchronized with other devices?
Yes, the interface allows full synchronization of multiple devices. - Does the DAC34SH84 support data rates up to 750 MSPS?
Yes, the 32-bit DDR flexible LVDS input bus supports data rates up to 750 MSPS. - What interpolation filter options are available on the chip?
The device offers selectable 2x, 4x, 8x, and 16x interpolation filters. - How many independent mixers does the DAC34SH84 include?
The device includes two independent fine mixers with 32-bit NCOs. - Is the DAC34SH84 suitable for wireless basestation upgrades?
Yes, it is offered as a pin-compatible upgrade for LTE, GSM, and WiMAX wireless basestations. - What is the price of the DAC34SH84 evaluation module?
The DAC34SH84EVM evaluation module can be purchased for US$499. - Does the device include a temperature sensor?
Yes, the device is characterized with a temperature sensor. - What package type is the DAC34SH84 available in?
The device is available in a 196-ball, 12-mm x 12-mm, 0.8-mm pitch BGA package.
