DR65-0002 Datasheet, PDF (1/4 Pages) Tyco Electronics – Linear Driver for PIN Diode Attenuators

DR65-0002
Linear Driver for
PIN Diode Attenuators
Features
• Linearizes PIN Diode Attenuators Over a Wide
Attenuation Range
• Output Currents up to 12 mA
• Operates with a Single Supply Voltage of +3V to
+12V
• Low Quiescent Currents
• Single Control Voltage
• Test Boards are Available
• Tape and Reel Packaging Available
• SOW-16 Package
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.
Ordering Information
Part Number
DR65-0002
Package
Bulk Packaging
DR65-0002TR
1000 piece reel
DR65-0002-TBG
DR65-0002-TBP
Test Board with Circuit per Figure 1
(AT10-0009,
GSM Attenuator)
Test Board with Circuit per Figure 1
(AT10-0017,
PCS Attenuator)
Note: Reference Application Note M513 for reel size
information.
Rev. V5
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 (less than
± 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.
Pin Configuration
Pin No.
1
2
3
4
5
6
7
8
Function
N/C
N/C
REF
INPUT +
GND
N/C
N/C
N/C
Pin No.
9
10
11
12
13
14
15
16
Function
N/C
N/C
N/C
OUTPUT
N/C
+ V_CC
N/C
N/C
1
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is considering for development. Performance is based on target specifications, simulated results,
and/or prototype measurements. Commitment to develop is not guaranteed.
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Solutions has under development. Performance is based on engineering tests. Specifications are
typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available. _{M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make}
Commitment to produce in volume is not guaranteed.
changes to the product(s) or information contained herein without notice.