Editor's choice of DACs and ADCs that impress with high
accuracy and dynamic range without big power penalties.
Analog Devices’ AD9789 and AD9739
TxDACs feature the firm’s proprietary mix-mode architecture, which
supports digital synthesis of RF signals up to 3.6 GHz.
The AD9739 14-bit TxDAC provides output signals to 3.6GHz. The DAC
features a dual-port low-voltage differential signalling (LVDS)
interface to support the high sample rate with existing FPGAs. An
SPI port is included for configuration and status-register read
back. The output current is programmable from 8.7mA to
31.7mA.
The AD9739 operates from 1.8V and 3.3V supplies for a total maximum
power consumption of 1.1 W.
www.analog.com
Diodes has combined an eight-channel DAC and pre-amplifier
chip for use in audio video receivers (AVR) and add-on sound
cards.
Part of the Zetex Direct Digital Feedback Amplifier (DDFA) product
line, the ZXCZM800 will deliver a dynamic range (DNR) as high as
126db.
In terms of DAC performance metrics, the ZXCZM800 offers a maximum
resolution of 32 bits, meaning more headroom and less impact on
performance with higher input audio data resolutions.
Maximum sample rate is up to 192kHz and DNR in single-ended
operating mode is 120dB.
www.diodes.com
Fujitsu’s MB86065 is a 14-bit >1GSample/s
DAC.
Data is input via a high-speed LVDS port. This operates in a pseudo
double data rate (DDR) mode, with data latched on both rising and
falling edges.
Alternatively, the device can be configured as a multiplexed
dual-port single DAC.
To simplify system integration, the DAC is clocked at half the DAC
conversion rate.
Designed with wireless basestations in mind, the DAC’s dynamic
performance is 74dBc ACLR for four-carrier UMTS at 276MHz
direct-IF.
There is also is a dual 14-bit 1GSample/s version, the
MB86064.
www.fujitsu.com
Intersil's KAD5512HP is a 12-bit ADC designed with
the firm’s FemtoCharge technology on a standard CMOS process. It
supports sampling rates of up to 250MSample/s.
The KAD5512HP is part of a pin-compatible portfolio of 10, 12 and
14-bit A/Ds with sample rates ranging from 125MSPS to
500MSPS.
A serial peripheral interface (SPI) port allows for fine control of
parameters such as gain and offset.
Digital output data is presented in selectable LVDS or CMOS
formats.
www.intersil.com
Linear Technology’s LTC2634 quad 12-bit, 10-bit
and 8-bit rail-to-rail DACs come in 3x3mm QFN and MSOP packages and
include a 10ppm/°C on-chip voltage reference.
The LTC2634 offers 12-bit performance of ±2.5LSB (max) INL error
and less than 2.4nV.s crosstalk, ensuring that a voltage change on
one DAC has minimal effect on the other DACs.
Operating from a single 2.7V to 5.5V supply, supply current is a
low 125uA per DAC.
www.linear.com
Maxim Integrated Products’ family of quad
(MAX5134/MAX5135) and dual
(MAX5136/MAX5137), 16-bit and 12-bit DACs draw
less than 300nA in sleep mode.
Four 12- or 16-bit DACs can operate on an average current of
2.5µA.
Another interesting feature is that each DAC channel can be powered
down individually for better control of power consumption.
The high linearity (±8LSB INL for the 16-bit DAC and ±1LSB INL for
the 12-bit DAC) is tuned for industrial process control and
portable instrumentation applications.
The on-chip voltage reference has a temperature coefficient of
10ppm/°C.
www.maxim-ic.com
National Semiconductor is offering a dual-channel 16-bit,
160Msamples/s pipeline ADC.
Targeted at multi-carrier, multi-standard GSM/EDGE, WCDMA, LTE and
Wimax wireless basestations, the ADC16DV160 consumes 650mW per ADC
channel and has an input-bandwidth of 1.4GHz.
The ADC16DV160 delivers 91.2dB (full scale)
spurious-free dynamic range, 76.3dBFS signal-to-noise ratio and
97.3dBFS higher-order harmonic distortion at 197MHz input
frequency.
www.national.com
Samplify Systems has range of 16-channel, 12-bit,
65Msample/s ADCs which feature data compression circuits
on-chip.
The ADCs incorporate the firm’s Prism data compression technology,
which reduces the number of LVDS I/O pairs and can cut power
consumption. The 16-channel SAM1610 and
eight-channel SAM1605 combine 12-bit,
45/65Msample/s ADCs with Samplify’s patented Prism signal
compression technology.
The SAM1610/00 have 16 truly independent ADC channels, not
time-sharing pseudo channels. So the crosstalk performance is
improved.
The SAM1600 family draws just 44 mW per channel.
www.samplify.com
Texas Instruments is offering a four-channel,
high-voltage, bipolar digital-to-analogue converter.
Developed on TI’s HPA07 analogue CMOS process
technology, the 16-bit DAC8734 is part of a family of bipolar DACs,
including pin-compatible 12- and 14-bit family members.
The DAC8734 comes in a 6x6mm QFN-40 or 7x7mm TQFP-48 package. The
device is capable of driving ±16V or 0 to +20V across four
channels, eliminating the external operational amplifier typically
required for additional voltage gain.
Built-in user calibration is designed to further reduce gain error
down to ±1 LSB, maximum, with a zero error of up to 1/8 LSB.
www.ti.com
Wolfson Microelectronics has combined a DAC and speaker
amplifier to improve the audio quality in low-cost speakers used in
mobile handsets and digital radios.
The WM9081 incorporates a 2.6W switchable class
AB/D speaker amplifier, dynamic range controller and ReTune Mobile
five-band parametric equaliser. The equaliser has programmable
coefficients, allowing speaker frequency response compensation and
user-defined music profiles.
The chip achieves audio performance of 92dB SNR in Class D mode and
1% THD+N at 2.4W output power into 4Ω speaker loads.
www.wolfsonmicro.com