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TS1005IJ5T 数据表(PDF) 9 Page - Silicon Laboratories

部件名 TS1005IJ5T
功能描述  RAIL-TO-RAIL SINGLE OP AMP
Download  13 Pages
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制造商  SILABS [Silicon Laboratories]
网页  http://www.silabs.com
标志 SILABS - Silicon Laboratories

TS1005IJ5T 数据表(HTML) 9 Page - Silicon Laboratories

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TS1005
TS1005 Rev. 1.0
Page 9
to set the gain. The equation is simply that of a
noninverting amplifier as shown in the figure.
The two resistors labeled R1 should be closely
matched to each other as well as both resistors
labeled R2 to ensure acceptable common-mode
rejection performance.
Resistor networks ensure the closest matching as
well as matched drifts for good temperature stability.
Capacitor C1 is included to limit the bandwidth and,
therefore, the noise in sensitive applications. The
value of this capacitor should be adjusted depending
on
the
desired
closed-loop
bandwidth
of
the
instrumentation
amplifier.
The
RC
combination
creates a pole at a frequency equal to 1/(2
π×R1C1).
If the AC-CMRR is critical, then a matched capacitor
to C1 should be included across the second resistor
labeled R1.
Because the TS1005 accepts rail-to-rail inputs, the
input common mode range includes both ground
and the positive supply of 1.5V. Furthermore, the
rail-to-rail output range ensures the widest signal
range possible and maximizes the dynamic range of
the system. Also, with its low supply current of
1.3
μA, this circuit consumes a quiescent current of
only ~2.7
μA, yet it still exhibits a 2-kHz bandwidth at
a circuit gain of 2.
Driving Capacitive Loads
While the TS1005’s internal gain-bandwidth product
is 20kHz, it is capable of driving capacitive loads up
to 50pF in voltage follower configurations without
any additional components. In many applications,
however, an operational amplifier is required to drive
much larger capacitive loads. The amplifier’s output
impedance and a large capacitive load create
additional phase lag that further reduces the
amplifier’s phase margin. If enough phase delay is
introduced, the amplifier’s phase margin is reduced.
The effect is quite evident when the transient
response is observed as there will appear noticeable
peaking/ringing in the output transient response.
If the TS1005 is used in an application that requires
driving larger capacitive loads, an isolation resistor
between the output and the capacitive load should
be used as illustrated in Figure 5.
Table 1 illustrates a range of RISO values as a
function of the external CLOAD on the output of the
TS1005. The power supply voltage used on the
TS1005
at
which
these
resistor
values
were
determined empirically was 1.8V. The oscilloscope
capture shown in Figure 6 illustrates a typical
transient response obtained with a CLOAD = 100pF
and an RISO = 120k
Ω. Note that as CLOAD is
increased a smaller RISO is needed for optimal
transient response.
In the event that an external RLOAD in parallel with
CLOAD appears in the application, the use of an RISO
results in gain accuracy loss because the external
series RISO forms a voltage-divider with the external
load resistor RLOAD.
External Capacitive
Load, CLOAD
External Output
Isolation Resistor, RISO
0-50pF
Not Required
100pF
120k
500pF
50k
1nF
33k
5nF
18k
10nF
13k
Figure 5: Using an External Resistor to Isolate a CLOAD from
the TS1005’s Output
Figure 6: TS1003 Transient Response for RISO = 50kΩ and
CLOAD = 500pF.
VIN
VOUT


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