TS1001IJ5T datasheet(9/11 Pages) TOUCHSTONE

Teilenummer	TS1001IJ5T

Bauteilbeschribung	THE ONLY 0.8V/0.6 RAIL-TO-RAIL OP AMP

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Hersteller	TOUCHSTONE [Touchstone Semiconductor Inc]

Direct Link	http://www.touchstonesemi.com

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TS1001

TS1001DS r1p0

Page 9

RTFDS

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 TS1001 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

0.6μA, this circuit consumes a quiescent current of

only ~1.3μA, yet it still exhibits a 1-kHz bandwidth at

a circuit gain of 2.

Driving Capacitive Loads

While the TS1001’s internal gain-bandwidth product

is 4kHz, 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 TS1001 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

TS1001. The power supply voltage used on the

TS1001 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.

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

120kΩ

500pF

50kΩ

1nF

33kΩ

5nF

18kΩ

10nF

13kΩ

Figure 5: Using an External Resistor to Isolate a CLOAD from

the TS1001’s Output

Figure 6: TS1001 Transient Response for RISO = 50kΩ and

CLOAD = 500pF.

VIN

VOUT

Ähnliche Beschreibung - TS1001IJ5T

Hersteller	Teilenummer	Datenblatt	Bauteilbeschribung
List of Unclassifed Man...	TS1001	518Kb / 11P	THE ONLY 0.8V/0.6關A RAIL-TO-RAIL OP AMP
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Touchstone Semiconducto...	TS1005	855Kb / 11P	A 0.8V TO 5.5V, 1.3uA, 20kHz RAIL-TO-RAIL SINGLE OP AMP
Analog Devices	AD8675	303Kb / 12P	Rail-to-Rail Output Op Amp Rev. E
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