Datasheet

DocID023274 Rev 4 15/28
TSX56x, TSX56xA Application information
28
4 Application information
4.1 Operating voltages
The amplifiers of the TSX56x and TSX56xA series can operate from 3 V to 16 V. Their
parameters are fully specified at 3.3 V, 5 V and 16 V power supplies. However, the
parameters are very stable in the full V
CC
range. Additionally, the main specifications are
guaranteed in extended temperature ranges from -40 to +125 °
C.
4.2 Rail-to-rail input
The TSX56x and TSX56xA devices are built with two complementary PMOS and NMOS
input differential pairs. The devices have a rail-to-rail input, and the input common mode
range is extended from V
CC-
- 0.1 V to V
CC+
+ 0.1 V.
However, the performance of these devices is clearly optimized for the PMOS differential
pairs (which means from V
CC-
- 0.1 V to V
CC+
- 1.5 V).
Beyond V
CC+
- 1.5 V, the operational amplifiers are still functional but with degraded
performance, as can be observed in the electrical characteristics section of this datasheet
(mainly V
io
and GBP). These performances are suitable for a number of applications
needing to be rail-to-rail.
The devices are designed to prevent phase reversal.
4.3 Input offset voltage drift over temperature
The maximum input voltage drift over the temperature variation is defined as the offset
variation related to the offset value measured at 25 °C. The operational amplifier is one of
the main circuits of the signal conditioning chain, and the amplifier input offset is a major
contributor to the chain accuracy. The signal chain accuracy at 25 °C can be compensated
during production at application level. The maximum input voltage drift over temperature
enables the system designer to anticipate the effects of temperature variations.
The maximum input voltage drift over temperature is computed in Equation 1.
Equation 1
with T = -40 °C and 125 °C.
The datasheet maximum value is guaranteed by measurement on a representative sample
size ensuring a C
pk
(process capability index) greater than 2.
ΔV
io
ΔT
------------ max
V
io
T() V
io
25° C()–
T25° C–
---------------------------------------------------
=