LMH6552SDEVAL National Semiconductor, LMH6552SDEVAL Datasheet - Page 18

• Manufacturer Part Number: LMH6552SDEVAL
• Description: BOARD EVALUATION FOR LMH6552
• Manufacturer: National Semiconductor
• Series: LMH®, PowerWise®r

Specifications of LMH6552SDEVAL

• Channels Per Ic: 1 - Single
• Amplifier Type: Differential
• Output Type: Differential
• Slew Rate: 3800 V/µs
• -3db Bandwidth: 1.5GHz
• Current - Output / Channel: 80mA
• Operating Temperature: -40°C ~ 85°C
• Current - Supply (main Ic): 22.5mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 12 V, ±2.25 V ~ 6 V
• Board Type: Fully Populated
• Utilized Ic / Part: LMH6552
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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for a given package (°C/W). For the SOIC package θ
150°C/W; LLP package θ
NOTE: If V
flowing in the feedback network. This current should be in-
cluded in the thermal calculations and added into the quies-
cent power dissipation of the amplifier.
ESD PROTECTION
The LMH6552 is protected against electrostatic discharge
(ESD) on all pins. The LMH6552 will survive 2000V Human
Body model and 200V Machine model events. Under normal
operation the ESD diodes have no affect on circuit perfor-
mance. There are occasions, however, when the ESD diodes
will be evident. If the LMH6552 is driven by a large signal while
the device is powered down the ESD diodes will conduct . The
current that flows through the ESD diodes will either exit the
chip through the supply pins or will flow through the device,
hence it is possible to power up a chip with a large signal
applied to the input pins. Using the shutdown mode is one
way to conserve power and still prevent unexpected opera-
tion.
BOARD LAYOUT
The LMH6552 is a very high performance amplifier. In order
to get maximum benefit from the differential circuit architec-
ture board layout and component selection is very critical. The
circuit board should have a low inductance ground plane and
well bypassed broad supply lines. External components
CM
is not 0V then there will be quiescent current
JA
is 58°C/W.
JA
is
18
should be leadless surface mount types. The feedback net-
work and output matching resistors should be composed of
short traces and precision resistors (0.1%). The output match-
ing resistors should be placed within 3 or 4 mm of the amplifier
as should the supply bypass capacitors. Refer to the section
titled Power Supply Bypassing for recommendations on by-
pass circuit layout. Evaluation boards are available free of
charge through the product folder on National’s web site.
By design, the LMH6552 is relatively insensitive to parasitic
capacitance at its inputs. Nonetheless, ground and power
plane metal should be removed from beneath the amplifier
and from beneath R
frequency.
With any differential signal path, symmetry is very important.
Even small amounts of asymmetry can contribute to distortion
and balance errors.
EVALUATION BOARD
National Semiconductor suggests the following evaluation
boards to be used with the LMH6552:
These evaluation boards can be shipped when a device sam-
ple request is placed with National Semiconductor.
Device
LMH6552MA
LMH6552SD
Package
SOIC
LLP
F
and R
G
for best performance at high
Evaluation Board
Ordering ID
LMH730154
LMH730168