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.
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.
Pin Configuration
Pin No.
1
2
3
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
Ordering Information
Part Number
MADR-007098-000100
MADR-007098-0001TR
MAAV-007089-DR01TB
Package
Bulk Packaging
1000 piece reel
Test Board with Circuit per Figure 1
(MAAV-007089-000100,
GSM Attenuator)
Test Board with Circuit per Figure 1
(MAAV-007090-000100,
PCS Attenuator)
4
5
6
7
8
MAAV-007090-DR01TB
Note: Reference Application Note M513 for reel size
information.
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.
Visit
www.macom.com
for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
MADR-007098
Linear Driver for
PIN Diode Attenuators
Figure 1. Linear Attenuator Schematic
RFin
+Vcc
C1
.01 µF
R1
14
4
Rev. V2
2
1,3,4
16,14,13
Vcontrol
(0 to 4V)
39K
R2
680
IN
MADR-007098
-000100
12
7
VOLTAGE
VARIABLE
ATTENNUATOR
3
REF
5
5,6,8
9,11,12
R3
(PTCT)
330
R4
360
10
RFoutput
NOTES:
a. Transfer function is 7.5 dB/V
b. Vcontrol is 0V to 4.0V
c. +Vcc is 5.0V ± 5%
d. R3 is a positive temperature coefficient thermistor.
e. Attenuator is MAAV-007089-000100 or MAAV-007090-000100
Figure 2. Typical Attenuation Error
MADR-007098-000100 Driver with MAAV-007090-000100 VVA
2.0
1.5
Attenuation Error (dB)
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0
3
6
9
12
15
18
21
24
27
30
2
Frequency: 1
960 M Hz
Vco nt: 0 to 4.0V
Attenuation (dB)
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.
Visit
www.macom.com
for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
MADR-007098
Linear Driver for
PIN Diode Attenuators
Rev. V2
Electrical Specifications: T
A
= 25°C, Z
0
= 50
Parameter
Output Drive Current
+V
CC
Supply Range
+V
CC
Supply Tolerance
+V
CC
Quiescent Current
Linearity
Transfer Function
Settling Time
Test Conditions
Load Dependent
—
—
No Load
Application Dependent
Application Dependent
50% Ctl to 90%/10% RF
Units
mA
V
%
mA
dB
dB/V
µs
Min
10
3.0
—
—
±1
3
—
Typ
—
5.0
5
1.0
± 2.5
7.5
50
Max
—
12
—
2.0
—
10
—
Absolute Maximum Ratings
1,2
Parameter
+V
CC
Input +
REF
Output Current
Operating Temperature
Storage Temperature
Package Power Dissipation
Lead Temperature
Absolute Maximum
+20 V
±5V
±5V
20 mA
-40ºC to +85ºC
-65ºC to +125ºC
150 mW
300ºC for 10 seconds
Handling Procedures
Please observe the following precautions to avoid
damage:
Static Sensitivity
Gallium Arsenide Integrated Circuits are sensitive
to electrostatic discharge (ESD) and can be
damaged by static electricity. Proper ESD control
techniques should be used when handling these
devices.
1. Exceeding any one or combination of these limits may cause
permanent damage to this device.
2. M/A-COM does not recommend sustained operation near
these survivability limits.
3
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.
Visit
www.macom.com
for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
MADR-007098
Linear Driver for
PIN Diode Attenuators
Lead-Free,
SOW-16
†
Rev. V2
†
Reference Application Note M538 for lead-free solder reflow
recommendations.
4
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.
Visit
www.macom.com
for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
MADR-007098
Linear Driver for
PIN Diode Attenuators
Rev. V2
M/A-COM Technology Solutions Inc. All rights reserved.
Information in this document is provided in connection with M/A-COM Technology Solutions Inc ("MACOM")
products. These materials are provided by MACOM as a service to its customers and may be used for
informational purposes only. Except as provided in MACOM's Terms and Conditions of Sale for such products or
in any separate agreement related to this document, MACOM assumes no liability whatsoever. MACOM
assumes no responsibility for errors or omissions in these materials. MACOM may make changes to
specifications and product descriptions at any time, without notice. MACOM makes no commitment to update
the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future
changes to its specifications and product descriptions. No license, express or implied, by estoppels or otherwise,
to any intellectual property rights is granted by this document.
THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR
IMPLIED, RELATING TO SALE AND/OR USE OF MACOM PRODUCTS INCLUDING LIABILITY OR
WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR
INCIDENTAL DAMAGES, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR
OTHER INTELLECTUAL PROPERTY RIGHT. MACOM FURTHER DOES NOT WARRANT THE ACCURACY
OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN
THESE MATERIALS. MACOM SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS,
WHICH MAY RESULT FROM THE USE OF THESE MATERIALS.
MACOM products are not intended for use in medical, lifesaving or life sustaining applications. MACOM
customers using or selling MACOM products for use in such applications do so at their own risk and agree to
fully indemnify MACOM for any damages resulting from such improper use or sale.
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.
Visit
www.macom.com
for additional data sheets and product information.
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