ada4830-1 Analog Devices, Inc., ada4830-1 Datasheet - Page 10

• Manufacturer Part Number: ada4830-1
• Description: High Speed Difference Amplifier With Input Short To Battery Protection
• Manufacturer: Analog Devices, Inc.

ADA4830-1
THEORY OF OPERATION
CORE AMPLIFIER
At the core of the
amp that is built on a 0.35 μm CMOS process. Together with the
core amplifier, the
on-chip resistors into a difference amplifier function. Common-
mode range extension at its inputs is achieved by employing a
resistive attenuator. The closed-loop differential to single-ended
gain of the video channel is internally fixed at 0.5 V/V (−6 dB)
to ensure compatibility with video decoders whose input range
is constrained to 1 V p-p or less. The transfer function of the
ADA4830-1
where:
V
V
respectively.
V
OVERVOLTAGE (SHORT TO BATTERY)
PROTECTION
Robust inputs guarantee that sensitive internal circuitry is not
subjected to extreme voltages or currents during a stressful
event. A short to battery condition usually consists of a voltage
on either input (or both inputs) that is significantly higher than
the power supply voltage of the amplifier. Duration may vary
from a short transient to a continuous fault.
The
inputs. Critical internal nodes are protected from exposure to
high voltages by circuitry that clamps the inputs at a safe level
and limits internal currents. This protection is available whether
the device is enabled or disabled, even when the supply voltage
is removed.
OUT
IN+
REF
ADA4830-1
and V
is the voltage at the VREF pin.
is the voltage at the output pin, VOUT.
IN−
is
are the input voltages at Pin INP and Pin INN,
can withstand voltages of up to 18 V on the
ADA4830-1
ADA4830-1
2
combines four highly matched
is a high speed, rail-to-rail op
Rev. 0 | Page 10 of 16
SHORT TO BATTERY OUTPUT FLAG
The short to battery output flag (STB pin) is functionally
independent of the short to battery protection. Its purpose is
to indicate an overvoltage condition on either input. Because
protection is provided passively, it is always available; the flag
merely indicates the presence or absence of a fault condition.
ESD PROTECTION
All pins on the
protection structures connected to the power supply pins (+VS
and GND). These structures provide protection during the
handling and manufacturing process.
The inputs (INN and INP) of the
to dc voltages well above the supply voltage; therefore, conven-
tional ESD structure protection cannot be used.
The
ESD devices at the input pins (INN, INP) to allow for a wide
common-mode voltage range and ESD protection well beyond
the handling and manufacturing requirements.
ADA4830-1
ADA4830-1
employs Analog Devices, Inc., proprietary
are protected with internal ESD
ADA4830-1
can be exposed
Data Sheet