Linear Driver for PIN Diode
Attenuators
DR65
-
0002
SOW-16
V 4.00
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
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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.
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.
Package outline conforms to JEDEC standard MS-013AA
Figure 1
DR65-0002
IN
REF
3
R2
680
R3
(PTCT)
330
R1
39K
Vcontrol
(0 to 4V)
5
4
ATTENNUATOR
12
+Vcc
R4
360
C1
.01 F
14
7
2
10
1,3,4
5,6,8
9,11,12
16,14,13
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
SCHEMATIC
LINEAR ATTENUATOR
RFin
RFoutput
Linear Driver for PIN Diode Attenuators
DR65-0002
Specifications subject to change without notice.
n
North America: Tel. (800) 366-2266
n
Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
n
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Visit www.macom.com for additional data sheets and product information.
V 4.00
2
Electrical Specifications, T
A
= +25
C, Reference Figure 1
Parameter
Test Conditions
Units
Min
Typical
Max
Output Drive Current
Load Dependent
mA
10
--
--
+V
CC
Supply Range
--
V
3.0
5.0
12
+V
CC
Supply Tolerance
--
%
--
5
--
+V
CC
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
S
--
50
--
Figure 2--Typical Attenuation Error
LINEARITY ERROR
DR65-0002 Driver with AT10-0017 Attenuator
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
0
3
6
9
12
15
18
21
24
27
30
Attenuation (dB)
Attenuation Error
Frequency: 1960 MHz
Vcont: 0 to 4.0V
Absolute Maximum Ratings
1
Parameter
Absolute Maximum
+V
CC
+20 V
Input +
5 V
REF
5 V
Output Current
20 mA
Operating Temperature
-40C to +85C
Storage Temperature
-65C to +125C
Package Power Dissipation
150 mW
Lead Temperature
300C for 10 seconds
1. Operation of this device above any one of these
parameters may cause permanent damage.
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
CC
7
N/C
15
N/C
8
N/C
16
N/C
Part Number
Package
DR65-0002
Bulk Packaging
DR65-0002TR
Tape & Reel (1K Reel)
DR65-0002-TBG
Test Board with Circuit per Figure 1
(AT10-0009, GSM Attenuator)
DR65-0002-TBP
Test Board with Circuit per Figure 1
(AT10-0017, PCS Attenuator)
Ordering Information
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