MACOM DR65-0002TR, DR65-0002 Datasheet

Linear Driver for PIN Diode
Attenuators

V 4.00

DR65-0002

Features

n Linearizes PIN Diode Attenuators Over a Wide

Attenuation Range

n Output Currents up to 12 mA
n Operates with a Single Supply Voltage of +3V to +12V
n Low Quiescent Currents
n Single Control Voltage
n SOW-16, Wide Body Plastic Package
n Test Boards are Available
n Tape and Reel Packaging Available

Description

M/A-COM's DR65-0002 is a break point free driver that
produces a logarithmic output current suitable for
linearizing PIN diode based shunt attenuators. This driver,
in conjunction with customer defined external components,
produces a linear transfer function (dB/V) between the
input control voltage of the driver and the attenuation
output of the PIN attenuator. The DR65-0002 has been
optimized for linearizing M/A-COM’s AT10-0009 or
AT10-0017 attenuators, but will function well with most
types of cathode grounded, PIN attenuators. The driver is
packaged in a SOW-16 package for commercial SMT
applications. A typical schematic for a 30 dB, 7.5 dB/V
linear attenuator is shown in Figure 1.

SOW-16

Package outline conforms to JEDEC standard MS-013AA

Circuit Description:

(Reference Figures 1 and 2)

The input divider, R1 and the sum of R2 and R3, sets the
overall transfer function of the circuit. To increase the
transfer function, decrease the Control Voltage and the
value of R1. Varying the value of R4 will optimize the
linearity of the circuit. One can achieve a very linear
transfer function (<± 1 dB/V) by driving the attenuator over
a smaller portion of its dynamic range. In the case of the
AT10-0009 and AT10-0017 attenuators, this would be
limited to a dynamic range of 28 and 25 dB, respectively.
Temperature compensation is a function temperature
coefficient of the thermistor, R3, and the ratio of R2 to R3,
and can only be optimized once the transfer function and
linearity component values have been established.

Figure 1

R1

Vcontrol
(0 to 4V)

39K

R2 680

R3

(PTCT)

NOTES:
TRANSFER FUNCTION IS 7.5 dB/V
Vcontrol IS 0V to 4.0V
+Vcc IS 5.0V ± 5%
R3 IS A POSITIVE TEMPERATURE COEFFICIENT THERMISTOR
ATTENUATOR IS AT10-0009 OR AT10-0017

4

3

330

R4 360

14

IN

DR65-0002

REF

5

+Vcc

C1

.01 µF

12

SCHEMATIC
LINEAR ATTENUATOR

RFin

2

1,3,4

ATTENNUATOR

7

5,6,8 9,11,12

10

RFoutput

16,14,13

Linear Driver for PIN Diode Attenuators

Electrical Specifications, TA = +25°C, Reference Figure 1

Parameter Test Conditions Units Min Typical Max

Output Drive Current Load Dependent mA 10 — —

+VCC Supply Range — V 3.0 5.0 12

+VCC Supply Tolerance — % — 5 —

+VCC Quiescent Current No Load mA — 1.0 2.0

Linearity Application Dependent dB ± 1 ± 2.5 —

Transfer Function Application Dependent dB/V 3 7.5 10

Settling Time 50% Ctl to 90%/10% RF µS — 50 —

DR65-0002

V 4.00

Figure 2—Typical Attenuation Error

2

1.5

1

0.5

0

-0.5

Attenuation Error

-1

-1.5

-2

Frequency: 1960 MHz
Vcont: 0 to 4.0V

DR65-0002 Driver with AT10-0017 Attenuator

0 3 6 9 12 15 18 21 24 27 30

LINEARITY ERROR

Attenuation (dB)

Pin Configuration

Pin # Function Pin # Function

1 N/C 9 N/C
2 N/C 10 N/C
3 REF 11 N/C
4 INPUT + 12 OUTPUT
5 GND 13 N/C
6 N/C 14 + V
7 N/C 15 N/C
8 N/C 16 N/C

CC

Absolute Maximum Ratings 1

Parameter Absolute Maximum

+V

CC

+20 V

Input + ± 5 V

REF ± 5 V

Output Current 20 mA

Operating Temperature -40ºC to +85ºC

Storage Temperature -65ºC to +125ºC

Package Power Dissipation 150 mW

Lead Temperature 300ºC for 10 seconds

1. Operation of this device above any one of these
parameters may cause permanent damage.

Ordering Information

Part Number Package

DR65-0002 Bulk Packaging

DR65-0002TR Tape & Reel (1K Reel)

DR65-0002-TBG Test Board with Circuit per Figure 1

DR65-0002-TBP Test Board with Circuit per Figure 1

(AT10-0009, GSM Attenuator)

(AT10-0017, PCS Attenuator)

Specifications subject to change without notice.

n North America: Tel. [phone]
n Asia/Pacific: Tel.[phone], Fax [phone]
n Europe: Tel. [phone], Fax[phone]

Visit www.macom.com for additional data sheets and product information.

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