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JFW's line of 6 GHz RF components targets wireless, Wi-Fi, and WiMAX networks. These components include dc to 6 GHz fixed attenuators with N or SMA connectors, dc to 6 GHz rotary attenuators, 0.2 GHz to 6 GHz digitally programmable attenuators (TTL, Ethernet, and RS-232 compatible), and 2 GHz to 6 GHz broadband power divider/combiners. Custom designs are available upon request.
JFW
(877) 887-4539
www.jfwindustries.com

The AD974x and AD978x families are members of Analog Devices' TxDAC portfolio of DACs optimized for the transmit signal path of communications systems. The two-channel, high-speed DACs include the AD974x family of 8-bit, 10-bit, 12-bit, 14-bit, and 16-bit devices with sample rates up to 250 Msps using low-voltage CMOS inputs. They include the AD978x family of 12-bit, 14-bit and 16-bit DACs, which use low-voltage differential signaling inputs to achieve sample rates as fast as 600 Msps. The TxDAC devices feature low noise and low intermodulation distortion to enable the high-quality synthesis of wideband cellular signals.

The AD974x and AD978x TxDAC devices offer W-CDMA adjacent-channel leakage ratio performance of 80 dBc at 61.44 MHz. The TxDAC ICs are ideal for many wideband communications standards. They are also designed for instrumentation applications.

The AD974x and AD978x families integrate a mixer function that provides designers with a usable output beyond the Nyquist frequency. In the normal mode, the signal in the first Nyquist zone is strongest. In the mixer mode, the DACs can directly generate RF signals by boosting the signal power in the second and third Nyquist zones. This allows designers to eliminate a mixing stage, reducing component count and design complexity in direct-RF applications.

The AD974x and AD978x families integrate two auxiliary DACs that can be used to compensate for TxDAC device or mixer offset errors without adding external components. The DACs operate from 1.8 V and 3.3 V power supplies and a have power dissipation of 315 mW. They are also pin-compatible and interface to analog quadrature modulators. TxDAC families are available in production quantities in a 72-lead lead-frame chip-scale package.

Pricing is from $14.59 for 1000 units.
Analog Devices
(800) 262-5643
www.analog.com

Maxim Integrated Products' MAX2112 is a low-cost, zero-IF, direct-conversion tuner for satellite TV. This tuner receives QPSK and 8PSK signals in the 925 MHz to 2175 MHz range, and downconverts them to baseband for demodulation. To reduce total solution size and cost, it provides an 8.0 dB noise figure and -75 dBm to 0 dBm dynamic range, thus eliminating the need for an external LNA. Additionally, its VCO auto-tuner function simplifies firmware for ease of use. The device is ideal for DVB-S2 and free-to-air applications in which low cost and ease of use are key requirements.

The MAX2112 operates from a single 3.3 V supply, consumes 300 mW, and is designed for use with a 27 MHz crystal. The MAX2112 is packaged in a 5 mm × 5 mm, 28-pin TQFN and is available in the commercial and extended industrial temperature ranges. Prices start at $4.50 for 1000 pieces. Evaluation kits and reference designs are available.
Maxim Integrated Products
(408) 737-7600
www.maxim-ic.com

Maxim Integrated Products' MAX9729 is a highly integrated headphone amplifier that features DirectDrive technology. This architecture produces a ground-referenced output from a single supply, eliminating the need for large dc-blocking capacitors. Integrated software-enabled bass boost and volume control makes the MAX9729 ideal for portable audio applications where space is limited and performance is essential. A beep input with independent attenuation control and a 3-to-1 stereo input multiplexer reduce system cost and board space. The MAX9729 includes click-and-pop suppression circuitry, which eliminates audible transients during power and shutdown cycles.

The MAX9729's bass-boost feature improves audio reproduction when using inexpensive headphones. Integrated volume control features 32 discrete volume levels and uses an electronic volume-ramping function to ensure smooth volume transitions during shutdown cycles and input selection. Eight programmable maximum gain settings allow a range of input-signal levels. A 3-to-1 multiplexer and mixer allow the selection and summation of multiple stereo input-signal sources. Bass boost, volume control, gain settings, and input selection are all controlled through the I²C-compatible serial interface.

The MAX9729 delivers 52 mW into a 32 load, low 0.03% THD+N, and high 90 dB PSRR. This device is available in a 5 mm × 5 mm × 0.8 mm, 28-pin TQFN package. Pricing starts at $0.80 for 1000 pieces, and an evaluation kit is available.
Maxim Integrated Products
(408) 737-7600
www.maxim-ic.com

Fixed coaxial attenuators from Mini-Circuits support a wide temperature range and are available with multiple connector types. The units with type-N connectors are rated for 0.5 W to 1.0 W, cover attenuation values ranging of 1 dB to 20 dB, and support a frequency range of dc to 6000 MHz.

The units with SMA connectors are available in two versions, one rated from 0.5 W to 1.0 W, and the other rated for 2.0 W. Both versions cover attenuation values ranging from 1 dB to 30 dB, and support a frequency range of dc to 6000 MHz.

The units with BNC connectors are rated for 0.5 W to 1.0 W. These units cover attenuation values from 1 dB to 30 dB, and support a frequency range from dc to 2000 MHz. Special versions fitted with BNC connectors provide a precise 75 . These special versions are rated for 0.5 W, cover attenuation values from 3 dB to 20 dB, and support a frequency range from dc to 2000 MHz.
Mini-Circuits
(718) 934-4500
www.minicircuits.com

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