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TS1002IM8TP Scheda tecnica(PDF) 9 Page - Touchstone Semiconductor Inc

Il numero della parte TS1002IM8TP
Spiegazioni elettronici  THE ONLY 0.8V/0.6uA RAIL-TO-RAIL DUAL/QUAD OP AMPS
Download  13 Pages
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Produttore elettronici  TOUCHSTONE [Touchstone Semiconductor Inc]
Homepage  http://www.touchstonesemi.com
Logo TOUCHSTONE - Touchstone Semiconductor Inc

TS1002IM8TP Scheda tecnica(HTML) 9 Page - Touchstone Semiconductor Inc

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TS1002/TS1004
TS1002_4DS r1p0
Page 9
RTFDS
The
circuit
utilizes
the
classic
two
op
amp
instrumentation amplifier topology with four resistors
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 these amplifiers accept rail-to-rail inputs,
their input common mode range includes both
ground and the positive supply of 1.5V. Furthermore,
their rail-to-rail output range ensures the widest
signal range possible and maximizes the dynamic
range of the system. Also, with their low supply
current of 0.6
μA per amplifier, this circuit consumes
a quiescent current of only ~1.3
μA, yet it still exhibits
a 1-kHz bandwidth at a circuit gain of 2.
Driving Capacitive Loads
While the
amplifiers’ internal gain-bandwidth product
is 4kHz, both are 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 any amplifier 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 these
amplifiers. The power supply voltage applied on the
these amplifiers 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 = 500pF
and an RISO = 50kΩ. Note that as CLOAD is increased
a smaller RISO is needed for optimal transient
response.
External Capacitive
Load, CLOAD
External Output
Isolation Resistor, RISO
0-50pF
Not Required
100pF
120kΩ
500pF
50kΩ
1nF
33kΩ
5nF
18kΩ
10nF
13kΩ
Figure 5: Using an External Resistor to Isolate a CLOAD from
the Amplifer’s Output.
Figure 4: A Two Op Amp Instrumentation Amplifier.


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