UMS Digital Attenuators DC–35GHz | CHT3029, CHT4012
Mfr. Part #：CHT3029-99F / CHT3029-QEG / CHT4012-QDG / CHT4012a98F / CHT4016-99F / CHT4016-QEG
Manufacturer：UMS / United Monolithic Semiconductors
Package/Case：Die, QFN
Description：UMS digital attenuators provide precise RF and microwave signal-level control across frequency ranges from DC to 35 GHz. The series includes 4-bit models with 15 dB attenuation control and 6-bit models with 31.5 dB attenuation control.The CHT3029 series is suitable for ultra-wideband DC–31/35 GHz systems, while the CHT4012 series offers low insertion loss for DC–6 GHz applications. The CHT4016 series covers 4–14/16 GHz with input P-1dB up to 23 dBm. Die and QFN options are available for radar, communication, defense, aerospace and RF instrumentation designs.
UMS Digital Attenuator Selection
| Part Number | Frequency Range | Bits | Amplitude Control | Attenuation Error | Control Voltage | Insertion Loss | P-1dB IN | Package |
| CHT3029-99F | DC–35 GHz | 4-bit | 15 dB | ±0.5 dB | 0/3.3 or 5 V | 4.5 dB | 20 dBm | Die |
| CHT3029-QEG | DC–31 GHz | 4-bit | 15 dB | ±0.5 dB | 0/3.3 or 5 V | 5 dB | 20 dBm | QFN |
| CHT4012-QDG | DC–6 GHz | 6-bit | 31.5 dB | −0.7/+0.4 dB | 0/3.3 or 5 V | 2.5 dB | 20 dBm | QFN |
| CHT4012a98F | DC–6 GHz | 6-bit | 31.5 dB | ±0.5 dB | 0/3.3 or 5 V | 2.5 dB | 20 dBm | Die |
| CHT4016-99F | 4–16 GHz | 6-bit | 31.5 dB | −1.5/+1 dB | −5/0 V | 6.5 dB | 23 dBm | Die |
| CHT4016-QEG | 4–14 GHz | 6-bit | 31.5 dB | ±0.8 dB | −5/0 V | 7 dB | 23 dBm | QFN |
Frequently Asked Questions
Q1: Which UMS digital attenuator offers the widest frequency range?
The CHT3029-99F provides the widest coverage, operating from DC to 35 GHz with four-bit control and a total attenuation range of 15 dB.
Q2: What is the difference between CHT3029-99F and CHT3029-QEG?
The CHT3029-99F is a bare Die covering DC–35 GHz, while the CHT3029-QEG is a packaged QFN device covering DC–31 GHz. Both provide 15 dB attenuation control.
Q3: Which model provides the lowest insertion loss?
The CHT4012-QDG and CHT4012a98F both offer 2.5 dB insertion loss, 31.5 dB attenuation control and DC–6 GHz operation.
Q4: What is the difference between CHT4012-QDG and CHT4012a98F?
The CHT4012-QDG is supplied in a QFN package and specifies an attenuation error of −0.7/+0.4 dB. The CHT4012a98F is supplied as a Die with a specified attenuation error of ±0.5 dB.
Q5: How do CHT4016-99F and CHT4016-QEG differ?
The CHT4016-99F Die covers 4–16 GHz with 6.5 dB insertion loss. The packaged CHT4016-QEG covers 4–14 GHz with 7 dB insertion loss. Both provide six-bit, 31.5 dB attenuation control.
