HMMC-1015 Avago Technologies US Inc., HMMC-1015 Datasheet - Page 3

• Manufacturer Part Number: HMMC-1015
• Manufacturer: Avago Technologies US Inc.

Specifications of HMMC-1015

• Operating Temperature (max): 125C
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

3
Application
The HMMC-1015 is designed to be used as a gain control
block in an ALC assembly. Because of its wide dynamic
range and return loss performance, the HMMC-1015
may also be used as a broadband pulse modulator or
single-pole single-throw, non-reflective switch.
Operation
The attenuation value of the HMMC-1002 is adjusted
by apply-ing negative voltage to V
tion setting, optimum VSWR is obtained by applying
negative voltage to V
to the gates of the shunt FETs sets the source-to-drain
resistance and establishes the attenuation level.
Applying negative voltage (V
series FETs optimizes the input and output match
for different attenuation settings. In some applica-
tions, a single setting of V
input and output match over the desired attenuation
range (V
be adjusted so that the device attenuation versus volt-
age is monotonic for both V
will slightly de-grade the input and output return loss.
Figure 1. HMMC-1015 Schematic.
RF
IN
2
). For any HMMC-1015 the values of V
50
1
. Applying negative voltage (V
DC
1
IN
1
may provide sufficient
1
and V
) to the gates of the
2
V
. At any attenua-
1
50Ω RF Attenuator Circuit
2
; however, this
500
1
500
may
2
)
The attenuation and input/output match of the HMMC-
1015 may also be controlled using only a single input
voltage by utilizing the on-chip DC reference circuit
and the driver circuit shown in Figure 4. This circuit
optimizes VSWR for any attenuation setting. Because
of process variations, the values of V
are different for each wafer if optimum performance
is required. Typical values for these elements are given.
The ratio of the resistors R
sitivity of the attenuation versus voltage performance
of the attenuator. For more information on the perfor-
mance of the HMMC-1015 and the driver circuits pre-
viously mentioned see MWTC’s Application Note #37,
“HMMC-1021 Attenuator: Attenuation Control.” For
more S-parameter information, see MWTC’s Applica-
tion Note #44, “HMMC-1015 Attenuator: S-Parameters.”
Assembly Techniques
GaAs MMICs are ESD sensitive. ESD preventive
measures must be employed in all aspects of storage,
handling, and assembly. MMIC ESD precautions,
handling considerations, die attach and bonding
methods are critical factors in successful GaAs MMIC
performance and reliability. Avago application note
#54, “GaAs MMIC ESD, Die Attach and Bonding Guide-
lines” provides basic information on these subjects.
V
2
DC
OUT
500Ω DC Reference Circuit
50
1
and R
2
determines the sen-
RF
REF
OUT
, R
REF
, and R
L