Home Products Attenuators Std. High Attn. Range
UMCC

Narrow Band High Range Variable Attenuators
(All Custom Made / Consult Factory)
High Dynamic Range
Linearized Voltage or Digital Controlled
Excellent Linearity and Flatness
Temperature Compensated

Available with variety of options
Other Frequencies available (Consult Factory)

- Specifications are subject to change without notice

- Click on  "" to see the actual response curves (subject to availability)

 
UMCC offers this  selection of pin-diode variable attenuators in octave bands  with high dynamic range to 80dB.  Attenuators are equipped with a linearizer driver circuit for attenuation control setting.  Control signal is via a voltage or a digital word.  Attenuators are also available without a driver where control would be via a forward current.

RF Circuit

Voltage Control Driver

Digital Control Driver

  Common Specifications

  Available Options
   

> Specifications are subject to change without notice
> for Specifications-Sheet in PDF, click on  the product model number

> to see the actual response curves, click on  ""  (subject to availability)

 

Voltage Controlled Attenuator (VCA) / "AT-X8XX-HV" Models
Digital Controlled Attenuator (DCA) / "AT-X8XX-HD" Models

Specifications for Standard Models (80 dB Dynamic Range Maximum)

Model No.
Frequency
(Ghz)
Insertion
Loss
(dB) Max
VSWR
Max
Power Rating
Operating (CW/PK)
Survival (CW/AVG)
Settling
 Time (1)
Attenuation Flatness (-/+ dB) Outline
Drawing
10dB 20dB 40dB 60dB 80 dB
AT-H800-HV 3 - 6 2.2 1.6:1 +20dbm (O)
+30dbm (
S)
1s
(5s<PW<0.1S)
0.3 0.8 1.3 1.5 2.0 -HV
AT-H800-HD -HD
AT-N800-HV 8 - 18
3.6 1.9:1 +20dbm (O)
+30dbm (
S)
1s
(5s<PW<0.1S)
0.9 1.6 2.3 2.4 2.3 -HV
AT-N800-HD -HD

1) "settling time" is defined as the time attenuation level transits from one attenuation level to within -/+1dB of another attenuation level

 

All Standard Models:
 Impedance: 50 Ω
 
 Mean Attenuation Range: 80 dB Nominal
 
 Control Characteristics:
- Voltage Controlled Units (AT-X8XX-HV series) 0V  to +8V, Slope = 10dB/Volt, Impedance=5~10Kohms
(0V = 0dB Attenuation (Reference))
- Digital Controlled Units (AT-X8XX-HD series)
9 Bit Positive Binary TTL
( LSB=0.25dB, MSB=64dB), Impedance=5~10Kohms
 
 Transfer Function Accuracy (Mean Attenuation): 0 - 0.8 dB   50% Max
>0.8 - 10 dB  0.40 dB Max
>10 - 30 dB 0.50 dB Max
>30 - 50 dB 0.90 dB Max
>50 - 70 dB 1.35 dB Max
>70 - 80 dB 1.85 dB Max
 
 Power Supplies: +12 to +15 VDC  @ 70mA Max

(Supplies are internally regulated)

-12 to -15 VDC  @ 70mA Max
 
 Connectors:
- RF Input / Output SMA (female), Removable
- Supply and Control (AT-X8XX-HV) Solder Pins
- Supply and Control (AT-X8XX-HD) 15-Pin D-Type Subminiature Male
 
 Temperature Coefficient: 0.025 dB/C  (Over Operating Temperature Range)

Environmental Ratings:
 Temperature:
- Operating -40 C to +85C
- Storage -50 C to +100C
 Humidity: Mil-STD-202F, Method 103B Condition B
 Shock: Mil-STD-202F, Method 213B Condition B
 Vibration: Mil-STD-202F, Method 204D Condition B
 Altitude: Mil-STD-202F, Method 105C Condition B
 Temp. Cycle: Mil-STD-202F, Method 107D Condition B

Available Options:
1) Units with options listed here may be subject to  some specification tradeoffs from the standard, consult factory
2) Some options may not be available on all models, consult factory
 
 RF Connectors  Control Function Resolution (AT-X8XX-HD series <> "80dB Range")
   B1   [ J1 SMA (male) ]   E1  [ LSB = 1/8 dB <> 10-Bits <> "fractional steps" ]
  B2   [ All SMA (male) ]   R1  [ LSB = 0.1 dB <> 10-Bits <> "decimal steps" ]
    E2  [ LSB = 1/16 dB <> 11-Bits <> "fractional steps" ]
 Control Connector (-HV series)   R2  [ LSB = 0.05 dB <> 11-Bits <> "decimal steps" ]
C1   [ SMC (Jack), 50 Ω ] E3  [ LSB = 1/32 dB <> 12-Bits <> "fractional steps" ]
   
C2   [ SMB (Jack), 50 Ω ]  Transfer Functions
F1  [ Slope = 5dB/Volt ] / (AT-X8XX-HV series)
C3   [ SMA(Female) ]   F3  [ Reverse Control Voltage (0V = Max Attenuation)] / (AT-X8XX-HV series)
    F3  [ Inverse Logic ("00.....00" = Max Attenuation)] / (AT-X8XX-HD series)
Control Impedance (AT-X8XX-HV series)    
  D1   [ 50 Ω, Internally Terminated ] Attenuation Range (AT-X8XX-HD series <> Limited Range)
      G1  [ 63.875 dB Attenuation Range / 9-Bits (LSB=1/8 dB) <> fractional steps]
 
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Std. High Attn. Range