Package Outline
PTB & PTM-64A Series 6-Bit DIGITAL PHASE SHIFTER
10 to 250 MHz / Low RF Transients / Fast Switching Time / Monotonic Output / BNC or SMA
For further information contact MERRIMAC / 41 Fairfield Pl., West Caldwell, NJ, 07006 / 973-575-1300 / FAX 973-575-0531
PRINCIPAL SPECIFICATIONS
Calibration SMA BNC
Frequency Model Model
fc, MHz Number Number
10 - 250 PTM-64A-**B PTB-64A-**B
For complete model number replace ** with desired calibration frequency, in MHz
GENERAL SPECIFICATIONS
Usable Bandwidth: fc ± 2.5%
Phase Shift Range:: 0° to 360° nom.@fc
Least Significant Bit: 5.6°
Most Significant Bit: 180°
Accuracy @ fc:1/2 of LSB typ.
(guaranteed monotonic)
Impedance: 50 Ω nom.
VSWR: 1.35:1 max.
Insertion Loss, IL:3 dB nom.
IL, Variation vs. Cont: ±0.5 dB @ fc
Input Power: +10 dBm max.
Control Input: 6 Bit TTL
Logic Sense: Positive
Supply Power: +5 VDC @ 350 mA nom.
+15 VDC @ 100 mA nom.
Settling Time: 100 ns typ., 250 ns max.
Weight, nominal: 10 oz (285 g)
Operating Temp: -- 55° to +85°C
NOTES: 1. Tolerance on 3 place decimals ± .020(.51) except as noted.
2. Dimensions in inches over millimeters.
General Notes:
1. PTM-64A series phase shifters are controlled directly
from TTL logic circuits and are available for center
frequencies from 10 to 250 MHz.
2. Their lumped element design is inherently narrow
band since it utilizes a quadrature hybrid in each switch
section. However, this approach provides much
smoother phase transitions than a switched cable design
since the switching does not take place in the RF signal
path. This feature makes the PTM-64A series preferable
for applications where minimizing switching transients is
important.
3. Accuracy and temperature stability of each phase shift
section allows for a resolution of 5.6°, but as total phase
shift increases, overall accuracy deteriorates due
to cumulative internal reflections. 24May96
Bit 1 (LSB) 23456 MSB)
Phase 5.5°11.2°22.5°45.0°90.0°180°
Phase Shift Increments
