7700A & 7700T Series Detectors Tunnel Diode Detectors Product Data Sheet The most important thing we build is trust Description: The 7700A series features a standard cylindrical coaxial package with SMA connectors and internal hermetically sealed module containing microstrip hybridized circuit and chip devices. -50 dBm through -15 dBm, linear region is -15 dBm through +5 dBm and saturation +5 dBm through +17 dBm. Above +17 dBm RF input power diode damage and subsequent burnout occurs. The 7700T provides capability for multiple, packaged tunnel diodes with coaxial matching structure and coaxial capacitor. DC return coil is included. Ease of diode selection and match (unit-to-unit) is an advantage of this package. Tunnel diode detectors have excellent temperature stability, very fast pulse response time, good RF match and broadband frequency flatness. Open circuit voltage sensitivity (K) and high power burnout are less than silicon based Schottky detectors, but the tunnel detector's relatively low video impedance with no dc bias requirement enables dc and ac coupling with video and log video post amplifiers. These detectors provide a usable 67 dB dynamic range from nominal TSS of -50 dBm, through maximum saturation at +17 dBm. Within this range, square law transfer response is Specifications: Frequency Range (GHz) Voltage Sensitivity (K) Min. (2) VSWR Typ. (3) Flatness Max. (dB) Tss Typ. (-dBm) (4) RF Bypass Capacitance Typ. (pF) 800 2.0:1 +0.5 50 100 13 120 7700A-0020 800 2.0:1 +0.5 50 100 13 120 7700T-0020 800 2.0:1 +0.6 50 20 4 120 7700A-0021 700 2.3:1 +0.6 50 20 4 120 7700T-0021 500 2.3:1 +1.0 50 12 3 100 7700A-0022 600 3.0:1 +1.0 50 12 3 100 7700T-0022 500 2.5:1 +1.5 50 20 4 100 7700A-0023 500 3.0:1 +1.5 50 20 4 100 7700T-0023 Video Rise Time Resistance Typ. (nS) Typ. (Ohms) (5) (6) Part Number (1) 0.1 - 2.0 2.0 - 8.0 8.0 - 18.0 2.0 - 18.0 1. 2. Notes: 3. 4. 5. 6. Detectors are normally supplied with negative (-) output voltage polarity, referenced to case ground. Positive (+) output polarity is available for most parts. To designate, add suffix "P" to end of part numbers. Minimum open circuit voltage sensitivity (K) in mV/mW is measured at -20 dBm RF input power into 30K ohm, external video load resistance (RL). VSWR measured at -20 dBm RF power input into 100 ohm, external video load resistance. Tangential signal sensitivity (Tss) is measured using a video amplifier restricted to 2 MHz bandwidth and having a noise contribution of 3 dB maximum. Pulse rise time (tr) in nanoseconds, is measured into an external load (RL) of 100 ohms with 12 picofarads in parallel. Video resistance is measured at -20dBm. For further information please contact: Cobham Sensor Systems 1001 Pawtuckett Blvd. Lowell, MA 01854 USA Tel: 877-COBHAM7 (877-262-4267) Email: Sales.Space&Components@Cobham.com Data Sheet Subject to Change Without Notice www.cobham.com