Api technologies corp. Smartstep 150t Manual

INSTALLATION & OPERATING

INSTRUCTIONS

Models 150T, 151T, & 152T

SmartStep®Programmable Attenuators

IM-275

This documentation may not be reproduced in any form, for any

purpose unless authorized in writing by API / Weinschel, Inc.

Frederick, Maryland

1997 - 2015

REV. 08/16

GENERAL

This manual provides general installation instructions and

wiring data to be used as an aid in installing the API /Weinschel

Model 150T, 151T and 152T Series SmartStep Programmable

Attenuators into any subsystem or applica-

tion. Also included are specifications and other technical

data to help in the installation and operation of your 150T Series

Programmable Attenuator.

Each attenuator consists of a cascaded assembly of switched attenuator cells

(Figure 1) and a internal TTL interface. The attenuator elements located in the

attenuator cell are created by a thin-film process which provides exceptional long-

term stability, low power and temperature coefficients. This series of step

attenuators uses a reed switching structure that provides rapid switching togeth-

er with low insertion loss.

IM-275

Figure 1. SmartStep Driver Circuitry

150 T Series SmartStep®Programmable Attenuators

BUILT-IN SMARTSTEP DRIVER CIRCUITRY: These SmartStep®attenuators feature 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 Smartstep bus. The parallel mode pro-

vides 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 vari-

ety of methods, such as a TTL-level digital output port, or mechanical toggle switches. The

Smartstep mode 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.

The SmartStep contains non-volatile configuration memory that is used to hold a wide vari-

ety of attenuator and driver-dependant parameters, including serial number, attenuator cell

dB values, relay configurations, and switching requirements, which are all accessable via

the Smartstep interface. This frees the system designer from such low-level details, allow-

ing faster integration. In either operational mode, the microcontroller enters an idle

condition during periods of inactivity, turning off all on-board clocks, reducing EMI con-

cerns, and lowering power consumption. On-board regulation for the digital circuitry allows

the SmartStep to operate from a single input supply voltage.

CELL CONFIGURATION

The table below list all the standard attenuation ranges and cell configurations for

API / Weinschel 150T Series Smartstep Programmable Attenuators (Models

150T, 151T, 152T). Note the dash number is the attenuation value of your atten-

uator.

Cell Range/

Model No. No. Step Size

D7 D6 D5 D4 D3 D2 D1 D0

15XT-11 4 0-11/1 4 2 4 1

15XT-15 4 0-15/1 4 2 8 1

15XT-31 5 0-31/1 4 16 2 8 1

15XT-55 4 0-55/5 20 20 10 5

15XT-62 5 0-62/2 8 16 4 32 2

15XT-70* 3 0-70/10 20 40 10

152T-70 4 0-70/10 20 20 20 10

15XT-75 4 0-75/5 10 20 40 5

15XT-90 4 0-90/10 30 20 30 10

15XT-110 4 0-110/10 40 20 40 10

* Model 152AT-70 also!

Data Bit-Cell Value (dB)

IM-275

INSTALLATION

MOUNTING: Each Programmable Step Attenuator is supplied with two mounting

screws (P/N MS35335-57). These screws will fit any of the mounting holes (4-40

UNC-2B x 0.22 MIN DP) located on either side of the attenuator.

RF CABLE INSTALLATION: Care should be taken to prevent strain on the inter-

connecting cables, since damage here may not always be apparent. Check the

attaching RF cables and the SMA connectors for signs of cracked insulation

and/or bent or worn pins prior to connection. Tests show that connectors must be

clean for accuracy and stability. This requires an inspection and cleaning of each

connector immediately before use. When cleaning precautions are observed reg-

ularly, connectors can maintain their stability for over several thousand

connection cycles. Weinschel recommends a torque value of 7 to 10 inch pounds

when connecting any RF cable to the attenuator's RF connectors.

DEVICE INTERFACE BUS (DIB) CONNECTOR WIRING: Figure 2 shows the

connectors contact pin numbering scheme and the signal designator for signal

present at each contact pin.

PIN 13

PIN 1

PIN 2

PIN 14

Name Pin Description

VIN 1 dc Supply Voltage, +12 to 15 V (1)

VIN 2 dc Supply Voltage, +12 to 15 V (1)

GND 3,4 dc Return

D0/SDA 7 Data Bit 0 (lsb)/I2C SDA

D1/SCL 8 Data Bit 1//I2C SCL

D2 5 Data Bit 2

D3 6 Data Bit 3

D4 11 Data Bit 4

D5 12 Data Bit 5

D6 9 Data Bit 6

D7 10 Data Bit 7 (msb)

Mode 13 Parallel/Serial Mode Select

Select 1=Parallel

0=I2C

This pin has a 22K resistive pull-up to 5 V.

Leave unconnected for parallel mode operation.

/RST 14 Reset Input, low active

This pin has a 22K resistive pull-up to 5 V

Leave unconnected if not used.

Note: D0-D7 pins contain weak active pullups, capable of sourcing

approximately 150 mA.

(1) Voltage may be applied to either PIN 1 or 2 or both.

Figure 2. DIB Connector Wiring

PARALLEL MODE OPERATION:

In the parallel mode of operation, the Smartstep attenuator accepts TTL-level

parallel data on the D0-D7 input data lines. Each data line controls a separate

attenuation cell, where a logic 1 input (TTL high) engages the attenuation cell, and

a logic 0 input (TTL low) bypasses the cell, providing a through path. The data

lines have a weak active pull-up to +5V, and therefore if the pin is left unconnect-

ed (or floating), will engage the attenuation cell. The on-board microcontroller

debounces the data lines and generates the proper timing and control sequence

for operation of the relays. The data line inputs are not latched, and must be driv-

en with a constant level to keep the desired attenuation setting.

SERIAL MODE OPERATION:

In the serial mode of operation, the Smartstep attenuator communicates over a

two-wire serial bus to the API / Weinschel Model 8210A Smartstep Interface. The

bus uses a clock (SCL) and data (SDA) line to send and receive program-ming

and configuration information. The messages sent over the bus use the

software protocol as defined in the ACCESS.bus™ V2.2 specification (Base

Protocol) with Weinschel-specific extensions to support the control of step atten-

uators (StepAttn Protocol). These protocols and operating instructions can be

located in the Model 8210A instruction manual (IM-288). The ACCESS.bus™

messages have the following format:

Byte# D7 D6 D5 D4 D3 D2 D1 D0 Description

1 D7 D6 D5 D4 D3 D2 D1 0 Destination address

2 S7 S6 S5 S4 S3 S2 S1 0 Source address

3 P L6 L5 L4 L3 L2 L1 L0 Protocol flag & Msg Length

4msg body- 0 to 127 bytes

Length+4 X7 X6 X5 X4 X3 X2 X1 X0 Checksum

For an indepth discussion of the hardware and software operation, refer to the

ACCESS.bus™ specification.

150T Series SmartStep®Programmable Attenuators

SPECIFICATIONS

NOMINAL IMPEDANCE: 50 Ω

FREQUENCY RANGE: Model 151T: dc to 4 GHz

Model 150T: dc to 18 GHz

Model 152T: dc to 26.5 GHz

DRIVER INTERFACE:

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 Specification

VIL Low Level input: -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 Supply current: 25 mA

ICELL Supply Current: 150 mA (per cell, switching)

POWER RATING: 1 watt average, 100 watts peak

(5 μsec pulse width; 0.5% duty cycle)

TEMPERATURE: -20° to +70°C operating

-20° to +85°C nonoperating

TEMPERATURE COEFFICIENT: <0.0001 dB/dB/C

POWER SENSITIVITY: <0.001 dB/dB/ Watt

RATED SWITCH LIFE: 5 million cycles per cell

RF INPUT CONNECTORS: Rugged female 3.5 mm which mate nondestructively with

SMA male connectors per MIL-STD-39012.

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).

SWITCHING SPEED: 20 msec (includes settling time)

CONTROL PULSE WIDTH: 20 msec (minimum)

REPEATABILITY: +0.1 typical per cell

VIBRATION: MIL-STD-202F, Method 204D Cond B

ALTITUDE: MIL-STD-202F, Method 105C Cond B, 50,000 Ft.

SHOCK: MIL-STD -202F, Method 213B Cond B, except 10G, 6 msec

HUMIDITY: MIL-STD-202F, Method 103B, Cond. B (96 Hrs. @ 95%, RH).

IM-275

150T Series SmartStep®Programmable Attenuators

Frequency (GHz)

APPLICABLE MODELS dc-4 4-18 18-26.5

151T-11, 151T-15, 151T-62, 1.50 - - - - - -

151T-75, 151T-110

150T-11, 150T-15, 150T-62, 1.50 1.90 - - -

150T-75, 150T-110

151T-70 (3 cell) 1.35 - - - - - -

150T-70 (3 cell) 1.35 1.70 - - -

152AT-70 (3 cell) 1.40 1.70 1.80

152T-11, 152T-15, 152T-55, 1.40 1.60 1.90

152T-70, 152T-75, 152T-90

MAXIMUM INSERTION LOSS (dB):

Frequency (GHz)

APPLICABLE MODELS dc-4 4-18 18-26.5

151T-11, 151T-15, 151T-75, 0.90 - - - - - -

151T-110

150T-11, 150T-15, 150T-75, 0.90 2.20 - - -

150T-110

151T-62 (5 cell) 1.10 ---- ----

150T-62 (5 cell) 1.10 2.60* ----

151T-70 (3 cell) 0.70 - - - - - -

151T-70 (3 cell) 0.70 1.60 - - -

152AT-70 (3 cell) 0.90 2.00 2.98

152T-11, 152T-15, 152T-55, 0.90 2.00 2.98

152T-70, 152T-75, 152T-90

*4-12.4 is 1.80, 12.4-18 is 2.60

MAXIMUM SWR (50 ΩCharacteristic Impedance):

IM-275

Specification (con’t):

Frequency Attenuation Setting (dB)

Range (GHz) 5 10 15 20 25 30 35 40 45 50 55

dc-4 0.2 0.3 0.4 0.4 0.4 0.6 0.6 0.7 0.7 0.8 1.0

4-12.4 0.3 0.4 0.5 0.5 0.5 0.7 0.8 0.9 0.9 1.0 1.3

12.4-18 0.4 0.4 0.5 0.5 0.5 0.8 1.0 1.1 1.1 1.2 1.6

18-26.5 0.5 0.5 0.6 0.6 0.6 0.9 1.2 1.4 1.4 1.5 2.0

Model 152T-55:

Frequency Attenuation Setting (dB)

Range (GHz) 10 20 30 40 50 60 70 80 90 100 110

dc-4 0.2 0.3 0.5 0.7 0.9 1.0 1.2 1.4 1.6 1.7 1.9

4-12.4 0.4 0.7 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.0

12.4-18 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.0

18-26.5 0.6 0.7 0.9 1.5 1.6 2.2 2.9 --- --- --- ---

Model 150T/151T-70, 150T/151T-110, 152AT-70:

Frequency Attenuation Setting (dB)

Range(GHz) 2 4 6 8 1012 14161820222426 28 3032

dc-4 0.3 0.3 0.3 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.6 0.6

4-12.4 0.4 0.4 0.4 0.5 0.5 0.6 0.6 0.6 0.7 0.7 0.7 0.8 0.8 0.8 0.8 0.8

12.4-18 0.5 0.5 0.5 0.6 0.6 0.6 0.8 0.8 0.8 0.8 0.8 1.0 1.0 1.0 1.2 1.2

Model 150T/151T-62:

Frequency Attenuation Setting (dB)

Range (GHz) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

dc-4 0.2 0.2 0.3 0.3 0.3 0.3 0.4 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5

4-12.4 0.3 0.3 0.4 0.4 0.5 0.5 0.6 0.6 0.6 0.6 0.7 0.7 0.7 0.7 0.7

12.4-18 0.5 0.6 0.6 0.6 0.6 0.7 0.7 0.7 0.7 0.8 0.8 0.8 0.8 0.8 0.8

18-26.5 0.5 0.6 0.7 0.8 0.9 0.9 0.9 1.0 1.1 1.1 1.1 1.1 1.1 1.1 1.1

Model 150T/151T/152T-11 & 150T/151T/152T-15:

Frequency Attenuation Setting (dB)

Range (GHz) 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75

dc-4 0.2 0.2 0.4 0.4 0.5 0.5 0.7 0.7 0.9 0.9 1.1 1.1 1.2 1.2 1.4

4-12.4 0.3 0.3 0.6 0.6 0.9 0.9 1.2 1.2 1.5 1.5 1.8 1.8 2.1 2.1 2.1

12.4-18 0.4 0.4 0.8 0.8 1.2 1.2 1.6 1.6 2.0 2.0 2.4 2.4 2.8 2.8 2.8

Model 150T/151T-75:

Frequency Attenuation Setting (dB)

Range (GHz) 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62

dc-4 0.6 0.6 0.7 0.7 0.7 0.8 0.8 0.8 0.9 0.9 0.9 1.0 1.0 1.0 1.2

4-12.4 1.0 1.0 1.1 1.1 1.3 1.4 1.4 1.4 1.5 1.6 1.6 1.6 1.8 1.8 1.8

12.4-18 1.4 1.4 1.6 1.6 1.8 1.8 2.0 2.0 2.0 2.2 2.2 2.2 2.4 2.4 2.4

Frequency Attenuation Setting (dB)

Range (GHz) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

dc-4 0.2 0.2 0.3 0.3 0.3 0.3 0.4 0.4 0.5 0.4 0.5 0.5 0.5 0.5 0.5 0.5

4-12.4 0.4 0.4 0.5 0.5 0.6 0.6 0.7 0.6 0.7 0.6 0.7 0.7 0.7 0.7 0.7 0.7

12.4-18 0.5 0.5 0.6 0.6 0.6 0.6 0.7 0.7 0.8 0.8 0.8 0.8 0.8 0.8 0.

8 0.8

Model 150T/151T-31:

Frequency Attenuation Setting (dB)

Range (GHz) 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

dc-4 0.5 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.7 0.7 0.7 0.7 0.7 0.8 0.8

4-12.4 0.8 0.8 0.9 0.9 0.9 0.9 0.9 0.9 1.1 1.0 1.0 1.0 1.0 1.1 1.1

12.4-18 0.9 0.9 1.0 1.0 1.0 1.0 1.1 1.1 1.2 1.2 1.2 1.2 1.2 1.3 1.3

Frequency Attenuation Setting (dB)

Range (GHz) 10 20 30 40 50 60 70 80 90

dc-4 0.3 0.5 0.6 0.7 0.8 1.0 1.1 1.1 1.2

4-12.4 0.4 0.5 0.7 0.9 1.0 1.3 1.5 1.6 1.7

12.4-18 0.5 0.6 0.8 1.1 1.2 1.4 1.7 1.8 2.1

18-26.5 0.5 0.6 0.9 1.4 1.5 1.8 2.3 2.4 2.8

Model 152T-70, 152T

-90:

Frequency Attenuation Setting (dB)

Range (GHz) 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75

dc-4 0.2 0.2 0.4 0.4 0.5 0.5 0.7 0.7 0.9 0.9 1.1 1.1 1.2 1.2 1.4

4-12.4 0.3 0.3 0.6 0.6 0.9 0.9 1.2 1.2 1.5 1.5 1.8 1.8 2.1 2.1 2.1

12.4-18 0.4 0.4 0.8 0.8 1.2 1.2 1.6 1.6 2.0 2.0 2.4 2.4 2.8 2.8 2.8

Model 150T/151T/152T-75:

18 - 26.5 0.5 0.5 0.9 0.9 1.2 1.2 1.6 1.6 2.0 2.0 2.4 2.4 2.8 2.8 2.8

150T Series SmartStep®Programmable Attenuators

CONTACTING API / Weinschel

In the event you're having difficulty or believe that the components are defective,

please contact Weinschel immediately. An apparent malfunction may be correct-

ed over the phone by contacting the Customer Service Department at Weinschel.

DO NOT send the product back to the factory without prior authorization (RMA

number). When it is necessary to return an item, state the symptoms or problems,

catalog and type number of the attenuator, and date of original purchase. Also

write the company name, your name, and phone number on an index card. Then

attach the card to the attenuator to be returned.

For more information or any questions about your Programmable Step

Attenuators and/or other API / Weinschel products, contact the Sales

Department at API / Weinschel.

PHYSICAL DIMENSIONS:

DIM A B C

3 cell 83.0 (3.27) 76.2 (3.0) 101.6 (4.00)

4 cell 110.7 (4.36) 103.6 (4.06) 129.2 (5.09)

5 cell 136.9 (5.39) 129.8 (5.11) 156.2 (6.15)

NOTE: All dimensions are given in mm (inches) and are maximum, unless otherwise specified.

IM-275

ACCESSORIES

Model 8210 Smartstep Interface: The Model 8210 Smartstep Interface provides a flexi-

ble, low cost solution for the operation of programmable step attenuators and other

electromechanical devices under computer control. Designed to interface to Weinschel's

new line of Smartstep Programmable Attenuators, the 8210 represents a new concept in

device control applications for bench test and subsystem designs. The 8210 provides a

high-level interface from various industry standard communications interfaces, including

IEEE-488/RS232/RS422/RS485, to the Smartstep's serial Device Interface Bus. Typical

Setup shown below:

Smartstep Programmable Attenuators

8210

Smartstep

Interface

Device Interface

Bus (I2C)

PC Controller

IEEE-488/RS232/

RS422/RS485 Bus

OPTIONAL CALIBRATION DATA: Calibration Data is available at an additional cost for all

programmable step attenuator models. This calibration data is generated using a comput-

er controlled Weinschel Attenuation Measurement System. Standard calibration data can

be provided in 250 MHz steps for all dc-4 GHz models and in 500 MHz steps for dc-18 and

dc-26.5 GHz models. The measurements are traceable to NIST Standards.

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