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UMCC

Wide Band Variable Attenuators
Frequencies from 10 MHz to 18 GHz
Linearized Voltage Controlled
Linearized Digital Controlled
Excellent Linearity and Flatness
Temperature Compensated
 Available with variety of options
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UMCC offers this  selection of pin-diode variable attenuators in multi-octave bands  from 10 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.  

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-XXV Series)
Digital Controlled Attenuator (DCA) / (AT-XXXX-XXD Series)

Specifications for Standard Models (30dB Range or 60 dB Range)

Model No.

 Frequency
Range (GHz)
 

 Attn.
Range		 Insertion 
Loss
(dB) Max		 VSWR
Max		 Power Rating
Operating (CW/PK)
Survival (CW/AVG)		 Settling
 Time (1)		 Attenuation Flatness 
(dB)  Peak-Peak		  Outline
Drawing 
10dB 20dB 30dB 40dB 60dB
AT-2000-30V 0.01 - 2
Response Plots in PDF		 30 dB 2.5 1.5:1 +14dbm (O)
+30dbm (S)		 25 µs
(50µs<PW<0.1S)		 0.4 0.6 0.8 x x Fig. 1
AT-2000-30D Fig. 2
AT-2000-60V 0.01 - 2
Response Plots in PDF		 60 dB 4.5 1.7:1 +14dbm (O)
+30dbm (S)		 25 µs
(50µs<PW<0.1S)		 0.8 1.0 1.0 1.2 1.5 Fig. 1
AT-2000-60D Fig. 3
AT-3000-30V 0.1 - 3
Response Plots in PDF		 30 dB 2.5 1.5:1 +14dbm (O)
+30dbm (S)		 5 µs
(15µs<PW<0.1S)		 0.3 0.3 0.6 x x Fig. 1
AT-3000-30D Fig. 2
AT-3000-60V 0.1 - 3
Response Plots in PDF		 60 dB 4.0 1.6:1 +14dbm (O)
+30dbm (S)		 5 µs
(15µs<PW<0.1S)		 0.5 0.5 0.8 1.2 2.5 Fig. 1
AT-3000-60D Fig. 3
AT-K000-30V 0.5 - 4 30 dB 1.9 1.7:1 +17dbm (O)
+30dbm (S)		 3 µs
(10µs<PW<0.1S)		 0.3 0.3 0.5 x x Fig. 1
AT-K000-30D Fig. 2
AT-K000-60V 0.5 - 4
Response Plots in PDF		 60 dB 3.5 1.85:1 +17dbm (O)
+30dbm (S)		 3 µs
(10µs<PW<0.1S)		 0.4 0.4 0.7 0.7 1.0 Fig. 1
AT-K000-60D Fig. 3
AT-L000-30V 1 - 8
Response Plots in PDF		 30 dB 2.4 1.8:1 +20dbm (O)
+30dbm (S)		 3 µs
(10µs<PW<0.1S)		 0.6 0.6 0.8 x x Fig. 1
AT-L000-30D Fig. 2
AT-L000-60V 1 - 8
Response Plots in PDF		 60 dB 3.8 1.8:1 +20dbm (O)
+30dbm (S)		 3 µs
(10µs<PW<0.1S)		 0.8 0.8 1.0 1.2 1.4 Fig. 1
AT-L000-60D Fig. 3
AT-R000-30V 0.5 - 12
Response Plots in PDF		 30 dB 3.4 1.9:1 +20dbm (O)
+30dbm (S)		 3 µs
(10µs<PW<0.1S)		 1.0 1.4 1.6 x x Fig. 1
AT-R000-30D Fig. 2
AT-R000-60V 0.5 - 12
Response Plots in PDF		 60 dB 4.8 1.9:1 +20dbm (O)
+30dbm (S)		 3 µs
(10µs<PW<0.1S)		 1.8 1.8 1.8 1.8 1.8 Fig. 1
AT-R000-60D Fig. 3
AT-S000-30V 2 - 18
Response Plots in PDF		 30 dB 4.5 2.2:1 +20dbm (O)
+30dbm (S)		 3 µs
(10µs<PW<0.1S)		 1.5 2.4 4.8 x x Fig. 1
AT-S000-30D Fig. 2
AT-T000-30V 0.7 - 18
Response Plots in PDF		 30 dB 4.5 2.2:1 +20dbm (O)
+30dbm (S)		 3 µs
(10µs<PW<0.1S)		 1.5 2.4 4.8 x x Fig. 1
AT-T000-30D Fig. 2

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
 Control Characteristics:
- Voltage Controlled Units (-XXV)  0V  to +8V, Slope = 10dB / Volt,  Impedance = 5~10 Kohms
(0V = 0dB Attenuation (Reference))
- Digital Controlled Units (-30D); 30dB Range Units 8 Bit Positive Binary TTL
( LSB = 0.125 dB, MSB = 16 dB), Impedance = 5~10 Kohms
  - Digital Controlled Units (-60D); 60dB Range Units 8 Bit Positive Binary TTL
( LSB = 0.25 dB, MSB = 32 dB), Impedance = 5~10 Kohms
 Transfer Function Accuracy (Mean Attenuation):  
 

0 - 30 dB

   ± 0.5 dB
   

>30 - 60 dB

   ± 1.0 dB
   
 Power Supplies (internally regulated):
 

Models: AT-2000-30V & AT-2000-30D

   +12V to +15V @ 150mA Max
 -12V to -15V @  60mA Max
 

Models: AT-2000-60V & AT-2000-60D  

  +12V to +15V @ 170mA Max
 -12V to -15V @ 60mA Max

  

Models: AT-3000-30V, AT-K000-30V, AT-L000-30V, AT-S000-30V, AT-R000-30V  & AT-3000-30D, AT-K000-30D, AT-L000-30D, AT-S000-30D, AT-R000-30D

 

+12V to +15V @ 130mA Max
 -12V to -15V @ 60mA Max

  

Models: AT-3000-60V, AT-K000-60V, AT-L000-60V, AT-S000-60V, AT-R000-60V  & AT-3000-60D, AT-K000-60D, AT-L000-60D, AT-S000-60D, AT-R000-60D

 

+12V to +15V @ 150mA Max
 -12V to -15V @ 60mA Max
 Connectors:
- RF Input / Output SMA (female), Removable
- Supply and Control (-XXV) Solder Pins
- Supply and Control (-XXD) 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 (-30D series <> "30dB Range" )
   B1) J1 SMA (male)   R1  [ LSB = 0.1 dB <> 9-Bits <> "decimal steps" ]
  B2) All SMA (male)   E2  [ LSB = 1/16 dB <> 9-Bits <> "fractional steps" ]
    R2  [ LSB = 0.05 dB <> 10-Bits <> "decimal steps" ]
 Control Connector (-XXV series) E3  [ LSB = 1/32 dB <> 10-Bits <> "fractional steps" ]
C1) SMC (Jack), 50 Ω   E4  [ LSB = 1/64 dB <> 11-Bits <> "fractional steps" ]
 Control Function Resolution (-60D series <> "60dB Range" )
C2) SMB (Jack), 50 Ω   E1  [ LSB = 1/8 dB <> 9-Bits <> "fractional steps" ]
  R1  [ LSB = 0.1 dB <> 10-Bits <> "decimal steps" ]
  E2  [ LSB = 1/16 dB <> 10-Bits <> "fractional steps" ]
  C3) SMA (female)   R2  [ LSB = 0.05 dB <> 11-Bits <> "decimal steps" ]
        E3  [ LSB = 1/32 dB <> 11-Bits <> "fractional steps" ]
Control Impedance (-XXV Series)   E4  [ LSB = 1/64 dB <> 12-Bits <> "fractional steps" ]
  D1) 50 Ω, Internally Terminated    
       Transfer Functions
        F1  [ Slope = 5dB/Volt ] / (-XXV series)
        F3  [ Reverse Control Voltage (0V = Max Attn.)] / (-XXV series)
        F3  [ Inverse Logic ("00.....00" = Max Attn.)] / (-XXD series)
         
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