IDT introduces three low-loss ultra-linear RF variable attenuator products. IDT’s 6-bit F1912 and 7-bit F1956 DSAs feature IDT’s industry-first breakthrough Glitch-Free™ technology, which eliminates attenuation setting overshoot (glitches) from the transmit and/or receive paths by reducing transient “glitches” during most significant bit (MSB) transitions by up to 95 percent. Glitch-Free response enables customers to simplify their software interface, improve reliability, prevent damage to expensive sub-assemblies such as power amplifiers, and limit over-ranging of data converter inputs.
The F2250 is the first in a family of VVAs and features a frequency range of 50 MHz to 6000 MHz, an insertion loss of 1.4 dB at 2 GHz, high IP3I linearity of 65 dBm, and wide-temperature range of -40°C to 105°C. The VMODE feature allows customers to select either positive or negative attenuation control with a highly linear-in-dB attenuation characteristic.
F1912 Features
- Serial and 6-bit parallel interface
- 31.5 dB control range
- 0.5 dB step
- Glitch-FreeTM low transient overshoot
- 3.0 V to 5.25 V supply
- 1.8 V or 3.3 V control logic
- Attenuation error <0.22 dB @ 2 GHz
- Low insertion loss <1.6 dB @ 2 GHz
- Ultra linear IIP3 >+59.5 dBm
- IIP2 = +110 dBm typical
- Stable integral non-linearity over temperature
- Low-current consumption 550 μA typical
- -55°C to 105°C operating temperature
- 4 mm x 4 mm thin QFN 20 pin package
F1956 Features
- Serial and 7-bit parallel interface
- 31.75 dB range
- 0.25 dB steps
- Glitch-FreeTM low transient overshoot
- 500 ns settling time
- Ultra linear >64 dBm IIP3
- Low insertion loss <1.7 dB @ 4 GHz
- Attenuation error <±0.2 dB @ 4 GHz
- 3.3 V or 5 V supply
- 1.8 V or 3.3 V control logic
- -40°C to 105°C operating temperature
F2250 Features
- Low insertion loss: 1.4dB @ 2000MHz
- Typical/min IIP3: 65 dBm/47 dBm
- Typical/min IIP2: 95 dBm/87 dBm
- 33.6 dB attenuation range
- Bi-directional RF ports
- +34.4 dBm input P1dB compression
- VMODE pin allows either positive or negative attenuation control response
- Linear-in-dB attenuation characteristic
- Supply voltage: 3.15 V to 5.25 V
- VCTRL range: 0 V to 2.8 V
- +105°C max operating temperature
- 3 mm x 3 mm 16-pin TQFN package
