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®
INA2128
9
OFFSET TRIMMING
The INA2128 is laser trimmed for low offset voltage and
offset voltage drift. Most applications require no external
offset adjustment. Figure 2 shows an optional circuit for
trimming the output offset voltage. The voltage applied to
Ref terminal is summed with the output. The op amp buffer
provides low impedance at the Ref terminal to preserve good
common-mode rejection.
FIGURE 3. Providing an Input Common-Mode Current Path.
voltage swing of amplifiers A1 and A2. So the linear com-
mon-mode input range is related to the output voltage of the
complete amplifier. This behavior also depends on supply
voltage—see performance curves “Input Common-Mode
Range vs Output Voltage.”
Input-overload can produce an output voltage that appears
normal. For example, if an input overload condition drives
both input amplifiers to their positive output swing limit, the
difference voltage measured by the output amplifier will be
near zero. The output of the INA2128 will be near 0V even
though both inputs are overloaded.
LOW VOLTAGE OPERATION
The INA2128 can be operated on power supplies as low as
±2.25V. Performance remains excellent with power sup-
plies ranging from ±2.25V to ±18V. Most parameters vary
only slightly throughout this supply voltage range—see
typical performance curves. Operation at very low supply
voltage requires careful attention to assure that the input
voltages remain within their linear range. Voltage swing
requirements of internal nodes limit the input common-
mode range with low power supply voltage. Typical perfor-
mance curves, “Input Common-Mode Range vs Output
Voltage” show the range of linear operation for ±15V, ±5V,
and ±2.5V supplies.
47kΩ47kΩ
10kΩ
Microphone,
Hydrophone
etc.
Thermocouple
Center-tap provides
bias current return.
INA2128
1/2
INA2128
1/2
INA2128
1/2
10kΩ
OPA177
±10mV
Adjustment Range
100Ω(For other
channel)
100Ω
100µA
1/2 REF200
100µA
1/2 REF200
V+
V–
R
G
INA2128
1/2
Ref
V
O
V
IN
–
V
IN
+
FIGURE 2. Optional Trimming of Output Offset Voltage.
INPUT BIAS CURRENT RETURN PATH
The input impedance of the INA2128 is extremely high—
approximately 1010Ω. However, a path must be provided for
the input bias current of both inputs. This input bias current
is approximately ±2nA. High input impedance means that
this input bias current changes very little with varying input
voltage.
Input circuitry must provide a path for this input bias current
for proper operation. Figure 3 shows various provisions for
an input bias current path. Without a bias current path, the
inputs will float to a potential which exceeds the common-
mode range of the INA2128 and the input amplifiers will
saturate.
If the differential source resistance is low, the bias current
return path can be connected to one input (see the thermo-
couple example in Figure 3). With higher source impedance,
using two equal resistors provides a balanced input with
possible advantages of lower input offset voltage due to bias
current and better high-frequency common-mode rejection.
INPUT COMMON-MODE RANGE
The linear input voltage range of the input circuitry of the
INA2128 is from approximately 1.4V below the positive
supply voltage to 1.7V above the negative supply. As a
differential input voltage causes the output voltage increase,
however, the linear input range will be limited by the output