Home Products Attenuators Std. Narrow Band
UMCC

Narrow Band Variable Attenuators
 Frequencies from 0.25 to 18 GHz
Linearized Voltage or Digital Controlled
Current or Voltage Controlled (Driver Less)
Excellent Linearity and Flatness
Temperature Compensated
 Available with variety of options
 

 
 UMCC offers this  selection of pin-diode variable attenuators in octave bands  from 250 MHz to 18 GHz.  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-XXXX-HV Series)
Digital Controlled Attenuator (DCA) / (AT-XXXX-HD Series)
Current Controlled Attenuator (CCA) / (AT-XXXX-HC Series)

Specifications for Standard Models (60 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 50dB 60dB
AT-A000-HV 0.25 - 0.5
Response Curves in PDF		 1.9 1.5:1 +10dbm (O)
+30dbm (S)		 1µs
(10µs<PW<0.1S)		 0.3 0.8 1.5 1.5 1.6 -HV
AT-A000-HD -HD
AT-A000-HC -HC
AT-AB00-HV 0.35 - 0.7
 1.7 1.5:1 +10dbm (O)
+30dbm (S)		 1µs
(10µs<PW<0.1S)		 0.3 0.7 1.3 1.5 1.5 -HV
AT-AB00-HD -HD
AT-AB00-HC -HC
AT-B000-HV 0.5 - 1 1.7 1.4:1 +12dbm (O)
+30dbm (S)		 750 ns
(10µs<PW<0.1S)		 0.3 0.8 1.4 1.5 1.6 -HV
AT-B000-HD -HD
AT-B000-HC -HC
AT-C000-HV 1 - 2
Response Curves in PDF		 1.7 1.45:1 +14dbm (O)
+30dbm (S)		 500 ns
(5µs<PW<0.1S)		 0.3 0.8 1.4 1.5 1.7 -HV
AT-C000-HD -HD
AT-C000-HC -HC
AT-CD00-HV 1.5 - 3
Response Curves in PDF		 1.7 1.45:1 +17dbm (O)
+30dbm (S)		 500 ns
(5µs<PW<0.1S)		 0.3 0.8 1.4 1.5 1.8 -HV
AT-CD00-HD -HD
AT-CD00-HC -HC
AT-D000-HV 2 - 4
Response Curves in PDF		 1.7 1.45:1 +20dbm (O)
+30dbm (S)		  500 ns
(5µs<PW<0.1S)		 0.3 0.8 1.4 1.5 1.7 -HV
AT-D000-HD -HD
AT-D000-HC -HC
AT-H000-HV 3 - 6
Response Curves in PDF		 1.8 1.6:1 +20dbm (O)
+30dbm (S)		 500 ns
(5µs<PW<0.1S)		 0.3 0.8 1.3 1.5 1.8 -HV
AT-H000-HD -HD
AT-H000-HC -HC
AT-E000-HV 4 - 8
Response Curves in PDF		 2.2 1.6:1 +20dbm (O)
+30dbm (S)		 500 ns
(5µs<PW<0.1S)		 0.3 0.8 1.4 1.6 1.8 -HV
AT-E000-HD -HD
AT-E000-HC -HC
AT-Y000-HV 5 - 10
Response Curves in PDF		 2.4 1.6:1 +20dbm (O)
+30dbm (S)		 500 ns
(5µs<PW<0.1S)		 0.4 0.9 1.4 1.6 1.95 -HV
AT-Y000-HD -HD
AT-Y000-HC -HC
AT-Q000-HV 6 - 12
Response Curves in PDF		 2.5 1.6:1 +20dbm (O)
+30dbm (S)		  500 ns
(5µs<PW<0.1S)		 0.4 0.9 1.5 1.5 1.7 -HV
AT-Q000-HD -HD
AT-Q000-HC -HC
AT-M000-HV 10 - 17
Response Curves in PDF		 3.0 1.8:1 +20dbm (O)
+30dbm (S)		  500 ns
(5µs<PW<0.1S)		 0.5 0.5 0.5 0.9 1.6 -HV
AT-M000-HD -HD
AT-M000-HC -HC
AT-N000-HV 8 - 18
Response Curves in PDF		 3.3 1.9:1 +20dbm (O)
+30dbm (S)		  500 ns
(5µs<PW<0.1S)		 1.1 1.6 2.1 2.1 2.4 -HV
AT-N000-HD -HD
AT-N000-HC -HC

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: 60 dB Nominal
 
 Control Characteristics:
- Voltage Controlled Units (AT-XXXX-HV series) 0V  to +6V, Slope = 10dB/Volt, Impedance= 5~10Kohms
(0V = 0dB Attenuation (Reference))
  - Digital Controlled Units (AT-XXXX-HD series) 8 Bit Positive Binary TTL
( LSB=0.25dB, MSB=32dB), Impedance=5~10Kohms
- Current Controlled Units (AT-XXXX-HC series) 0 - 10 mA Forward Current (approx.)
 
 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 - 60 dB ± 1.20 dB Max
 
 Power Supplies: +12 to +15 VDC  @ 60mA Max

(Supplies are internally regulated)

 -12 to -15 VDC  @ 60mA Max
 
 Connectors:
- RF Input / Output SMA (female), Removable
- Supply and Control (AT-XXXX-HV series) Solder Pins
- Supply and Control (AT-XXXX-HD series) 15-Pin D-Type Subminiature Male
 
 Temperature Coefficient: ±0.025 dB/°C  (Over Operating Temperature Range)

Environmental Ratings:
 Temperature:
- Operating -40° C to +85°C
- Storage -50° C to +100°C
 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-XXXX-HD series <> "60dB Range" )
   B1   [ J1 SMA (male) ]   E1  [ LSB = 1/8 dB <> 9-Bits <> "fractional steps" ]
  B2   [ All SMA (male) ]   R1  [ LSB = 0.1 dB <> 10-Bits <> "decimal steps" ]
  E2  [ LSB = 1/16 dB <> 10-Bits <> "fractional steps" ]
 Control Connector (AT-XXXX-HV series)   R2  [ LSB = 0.05 dB <> 11-Bits <> "decimal steps" ]
C1   [ SMC (Jack), 50 Ω ] E3  [ LSB = 1/32 dB <> 11-Bits <> "fractional steps" ]
  E4  [ LSB = 1/64 dB <> 12-Bits <> "fractional steps" ]
C2   [ SMB (Jack), 50 Ω ]    
 Transfer Functions
C3   [ SMA (female) ]   F1  [ Slope = 5dB/Volt ] / (AT-XXXX-HV series)
    F3  [ Reverse Control Voltage (0V = Max Attenuation)] / (AT-XXXX-HV series)
Control Impedance (AT-XXXX-HV series)   F3  [ Inverse Logic ("00.....00" = Max Attenuation)] / (AT-XXXX-HD series)
  D1   [ 50 Ω, Internally Terminated ]

 

  
  Attenuation Range (AT-XXXX-HD series <> Limited Range)
  G1  [ 31.875 dB Attenuation Range / 8-Bits (LSB= 1/8 dB) <> fractional steps]
    G2  [ 25.5 dB Attenuation Range / 8-Bits (LSB= 0.1 dB) <> decimal steps]
     
  Attenuation Range (AT-XXXX-HV series <> Limited Range)
    G1  [ 30dB Range  / Slope = 5dB / Volt ]
 
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