MADR-007098 Datasheet, PDF (1/5 Pages) M/A-COM Technology Solutions, Inc. – Linear Driver for PIN Diode Attenuators

MADR-007098
Linear Driver for
PIN Diode Attenuators
Rev. V2
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
 Lead-Free SOW-16 Package
 100% Matte Tin Plating over Copper
 Halogen-Free “Green” Mold Compound
 260°C Reflow Compatible
 RoHS* Compliant Version of DR65-0002
Description
M/A-COM's MADR-007098-000100 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 MADR-007098-000100 has
been optimized for linearizing M/A-COM’s MAAV-
007089-000100 or MAAV-007090-000100
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
Package
MADR-007098-000100
Bulk Packaging
MADR-007098-0001TR
1000 piece reel
MAAV-007089-DR01TB
MAAV-007090-DR01TB
Test Board with Circuit per Figure 1
(MAAV-007089-000100,
GSM Attenuator)
Test Board with Circuit per Figure 1
(MAAV-007090-000100,
PCS Attenuator)
Note: Reference Application Note M513 for reel size
information.
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
MAAV-007089-000100 and MAAV-007090-000100
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 _{* Restrictions on Hazardous Substances, European Union Directive 2002/95/EC.}
M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
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