For more information www.linear.com/LT1999
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Pin 2 (+IN) and Pin 3 (–IN) are protected by ESD voltage clamps
which have asymmetric bidirectional breakdown characteristics with respect
to the GND pin (Pin 5). These pins can safely support common mode
voltages which vary from –5.25V to 88V without triggering an ESD clamp.
Note 3: Exposure to differential sense voltages exceeding the normal
operating range for extended periods of time may degrade part
performance. A heat sink may be required to keep the junction temperature
below the Absolute Maximum Rating when the inputs are stressed
differentially. The amount of power dissipated in the LT1999 due to input
overdrive can be approximated by:
DISS =V+IN −V−IN
Note 4: A heat sink may be required to keep the junction temperature
below the absolute maximum rating.
Note 5: The LT1999C/LT1999I are guaranteed functional over the operating
temperature range –40°C to 85°C. The LT1999H is guaranteed functional
over the operating temperature range –40°C to 125°C. The LT1999MP is
guaranteed functional over the operating temperature range –55°C to 150°C.
Junction temperatures greater than 125°C will promote accelerated aging.
The LT1999 has a demonstrated typical life beyond 1000 hours at 150°C.
Note 6: The LT1999C is guaranteed to meet specified performance from
0°C to 70°C. The LT1999C is designed, characterized, and expected to
meet specified performance from –40°C to 85°C but is not tested or
QA sampled at these temperatures. The LT1999I is guaranteed to meet
specified performance from –40°C to 85°C. The LT1999H is guaranteed
to meet specified performance from –40°C to 125°C. The LT1999MP is
guaranteed to meet specified performance from –55°C to 150°C.
Note 7: Full-scale sense (VSENSE) gives indication of the maximum
differential input that can be applied with better than 0.5% gain accuracy.
Gain accuracy is degraded when the output saturates against either power
supply rail. VSENSE is verified with V+ = 5.5V, VCM = 12V, with the REF pin
set to it’s voltage range limits. The maximum VSENSE is verified with the
REF pin set to it’s minimum specified limit, verifying the gain error is less
than 0.5% at the output. The minimum VSENSE is verified with the REF pin
set to its maximum specified limit, verifying the gain error at the output is
less than 0.5%. See Note 9 for more information.
Note 8: IB is defined as the average of the input bias currents to the +IN
and –IN pins (Pins 2 and 3). A positive current indicates current flowing
into the pin. IOS is defined as the difference of the input bias currents.
IOS = I(+IN) – I(–IN)
Note 9: The REF pin voltage range is the minimum and maximum limits
that ensures the input referred voltage offset does not exceed ±3mV over
the I, C, and H temperature ranges, and ±3.5mV over the MP temperature
Note 10: Common mode recovery time is defined as the time it takes the
output of the LT1999 to recover from a 50V, 20ns input common mode
voltage transition, and settle to within the DC amplifier specifications.
Note 11: Operating the LT1999 with V+ < 4.5V is possible, although the
LT1999 is not tested or specified in this condition. See the Applications
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
trCommon Mode Step Recovery Time
ΔVCM = ±50V, 20ns
VSSupply Voltage (Note 11) l4.5 5 5.5 V
ISSupply Current VCM > 5.5V
VCM = –5V
V+ = 5.5V, VSHDN = 0.5V, VCM > 0V
ROOutput Impedance ΔIO = ±2mA 0.15 Ω
ISRC Sourcing Output Current RLOAD = 50Ω to GND l3 31 40 mA
ISNK Sinking Output Current RLOAD = 50Ω to V+l10 26 40 mA
VOUT Swing Output High (with Respect to V+) RLOAD = 1kΩ to Mid-Supply
RLOAD = Open
Swing Output Low (with Respect to V–) RLOAD = 1kΩ to Mid-Supply
RLOAD = Open
tON Turn-On Time VSHDN = 0V to 5V 1 μs
tOFF Turn-Off Time VSHDN = 5V to 0V 1 μs
The l denotes the specifications which apply over the full operating
temperature range, –55°C < TA < 150°C for MP-grade parts, otherwise specifications are at TA = 25°C. V+ = 5V, GND = 0V, VCM = 12V,
VREF = floating, VSHDN = floating, unless otherwise specified. See Figure 2.