Programmable Attenuators Model 3250 & 3250T Programmable Attenuators dc to 1.0 GHz 1 Watt 75 Ω with optional TTL Interface T Series for use with Weinschel 8210A Controller MAXIMUM CHARACTERISTIC ZERO LOSS (dB): Frequency Range (GHz) dc - 0.5 0.5 - 1.0 Features o Cost Effective design for Wireless/Cellular Applications. o Optional Built-in Interface o Custom Configurations including bus controlled attenuator subsystems Specifications NOMINAL IMPEDANCE: 75 Ω FREQUENCY RANGE: dc to 1.0 GHz: MAXIMUM SWR: Frequency Range (GHz) SWR dc - 0.5 0.5 - 1.0 1.60 1.40 Loss (dB) 2.25 5.00 RATED SWITCH LIFE: 5 million operations per cell (typ) SWITCHING TIME: 8 msec. maximum @ nominal rated voltage. CYCLING RATE: 5 Hz maximum OPERATING VOLTAGE: +11V to +16V +12V to +17V (TTL opt -1) OPERATING CURRENT: 16 mA maximum per cell TEMPERATURE RANGE (Operating): -40 to +70°C POWER RATING: 1 watt average, 50 watts peak (5 μsec pulse width; 1% duty cycle) CONNECTORS: BNC female connectors per MIL-STD348 interface dimensions - mate nondestructively with MIL-C-39012 connectors. CONTROL TERMINALS: 0.040 inch. (1 mm) diameter solderable leads CONSTRUCTION: Housing: Aluminum Connectors: Nickel plated brass body and beryllium copper contacts. WEIGHT: 3250 140 g (4.5 oz) 3250T 189 g (4.9 oz) ACCESSORIES CELL CONFIGURATIONS: Model NO. Attenuation Number Cells Range/Steps (dB) 3250-63 6 63/1 Cell Increments (dB) 1, 2, 4, 8, 16, 32 INCREMENTAL ATTENUATION ACCURACY: Frequency Range (GHz) dc - 0.5 0.5 - 1.0 98 Accuracy + 0.3 dB or 2.0% + 0.4 dB or 2.0% Programmable Attenuator/Switch Controller: The Model 8210A Programmable Attenuator/Switch Controller provides a flexible, low cost solution for the operation of programmable step attenuators and other electromechanical devices under computer control. Designed to interface to Aeroflex / Weinschel's intelligent programmable attenuators, the 8210A represents a new concept in device control applications for bench test and subsystem designs. The 8210A provides a high-level interface from various industry standard communications interfaces, including IEEE-488 and RS232/RS422/RS485, to the programmable attenuator's serial Driver Interface Bus. 5305 Spectrum Drive, Frederick, MD 21703-7362 TEL: 301-846-9222, 800-638-2048 Fax: 301-846-9116 web: www.aeroflex.com/weinschel email: [email protected] Revision Date: 3/4/09 Programmable Attenuators CONTROL CONFIGURATION: Non-Volatile Configuration Memory Standard Unit: One terminal is connected to case ground and the remaining terminals are provided for activation of individual cells. Attenuation is fail-safe to "0" setting in the absence of a control voltage. Application of a voltage (+) to a particular cell causes it to switch to the attenuate position. Units with TTL Option: Units with this options are supplied with a very low profile connectorized TTL interface board mounted directly to the control terminals. This TTL interface option is available with a 10 pin ribbon cable connector and is supplied with a mating connector. Refer to Physical Dimensions for mating connector pin/wiring details. Two wires are specified for supply voltage and ground. The remaining wires will accept TTL control signals to activate or de-activate a particular attenuation cell. A TTL high will energize a cell to the high attenuation state, whereas a TTL low will maintain a cell in its zero attenuation state. To order 3250 Series Attenuators with this option add -1 to basic model number for ribbon cable connector. Example: Model 3250-63 with a TTL interface would be 3250-63-1. Note: Control is non-latching and requires a continuous control signal for the period of time in which attenuation is required. TTL DRIVER SPECIFICATIONS: INTERFACE CONNECTOR: Option -1: 10 pin .025 square post header on .1 center, mates with Amp connector 746285-1 or equivalent INPUT VOLTAGE: INPUT CURRENT: VIN High= +2.0V minimum VIN Low = +5.0V typical Vcc maximum 0 minimum 0.8 maximum IIN (VIN=2.4 V) = 55 μA IIN (VIN=3.85 V) = 280 μA SUPPLY CURRENT: ICC=25 mA maximum per cell SUPPLY VOLTAGE: VCC=+12.0 to +15 V TEMPERATURE RANGE (Operating): -40 to +70 °C Units with driver Circuitry (Figure 1): Model 3250T-63 features an internal microcontroller-based driver that provides a TTL-level digital interface for control of the attenuator relays. This card simplifies operation and interfacing requirements, while at the same time providing for greatly enhanced flexibility over past designs. User-selectable modes of operation include both parallel and serial bus. The parallel mode provides a simple, one-bit per relay on/off control with internal pullups for use primarily in single attenuator applications. This mode allows the attenuator to be controlled via a variety of methods, such as a TTL-level digital output port, or mechanical toggle switches. The built-in driver bus provides a two-wire serial bus structure and protocol for connecting a number of devices to a single host control interface, suitable for use in larger system and sub-system applications. This programmable attenuator contains non-volatile configuration memory that is used to hold a wide variety of attenuator TTL/CMOS Compatible Digital Interface Single-Chip Microcontroller Relay Drivers +5 V Regulator +12 to +15 V Input To Attenuator Relays EMI Filters Figure 1. Built-In Driver Circuitry and driver-dependent parameters, including serial number, attenuator cell dB values, relay configurations, and switching requirements, which are all accessible via the digital interface. Digital Driver Interface Specifications: Input Supply Voltage: +12.0 to +15.0V Control Signals: TTL/CMOS compatible Interface Modes: parallel/ I2C serial DC Characteristics (at 25°C): Digital Interface: Parameter VIL Low Level input: Specification -0.5 min, 0.8V max VIH High Level input: 2.0 min, 5.25V max IPU Pullup Current 50 μA min, 400 μA max Power Supply: VIN Supply Voltage: +12.0 to +15.0V IIN 25 mA Supply current: ICELL Supply Current: 150 mA (per cell, switching) TEMPERATURE: -20° to +70°C operating -55° to +85°C nonoperating INTERFACE CONNECTOR: 14 pin .025 square post header on .1 center. Mates with Amp connector 746285-2 or equivalent (one mating connector included with each unit). MODEL NUMBER DESCRIPTION: Example: 3250* - XX - X Basic Model Number Attenuation Value (dB) TTL Option (Add -1) Example: 3250-63-1 *Add T to Basic Model Number when ordering Digital Control Circuitry. 99 5305 Spectrum Drive, Frederick, MD 21703-7362 TEL: 301-846-9222, 800-638-2048 Fax: 301-846-9116 web: www.aeroflex.com/weinschel email: [email protected] Revision Date: 3/4/09 Programmable Attenuators PHYSICAL DIMENSIONS: Model 3250: Aeroflex / Weinschel BNC CONNECTORS BOTH ENDS Model 3250 w/TTL Option -1: Control Connector J3 Pin Locations: TTL Conn PIN No. (J3) 3250-63-1 dB (Cell) 1 NC 2 NC 3 32 4 1 5 2 6 4 7 8 8 16 9 COM 10 +Vcc NC = Not Connected NOTE: 100 All dimensions are given in mm (inches) and are maximum, unless otherwise specified. 5305 Spectrum Drive, Frederick, MD 21703-7362 TEL: 301-846-9222, 800-638-2048 Fax: 301-846-9116 web: www.aeroflex.com/weinschel email: [email protected] Revision Date: 3/4/09 Programmable Attenuators PHYSICAL DIMENSIONS: Model 3250T: NOTE: All dimensions are given in mm (inches) and are maximum, unless otherwise specified. 101 5305 Spectrum Drive, Frederick, MD 21703-7362 TEL: 301-846-9222, 800-638-2048 Fax: 301-846-9116 web: www.aeroflex.com/weinschel email: [email protected] Revision Date: 3/4/09