TS9001-2IJ5 datasheet(11/15 Pages) SILABS

Part #	TS9001-2IJ5

Description	1.6V Nanopower Comparator with Internal Reference

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Manufacturer	SILABS [Silicon Laboratories]

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TS9001

TS9001 Rev. 1.0

Page 11

Output Stage Circuitry

Many conventional analog comparators can draw

orders of magnitude higher supply current when

switching. Because of this behavior, additional

power supply bypass capacitance may be required

to

provide

additional

charge

storage

during

switching. The design of the TS9001-1’s rail-to-rail

output stage implements a technique that virtually

eliminates

supply-current

surges

when

output

transitions occur. The supply-current change as a

function of output transition frequency exhibited by

these analog comparators is very small. Material

benefits

of

this

attribute

to

battery-power

applications are the increase in operating time and

in reducing the size of power-supply filter capacitors.

Internal Voltage Reference

The

TS9001-1/2’s

internal

+1.252V

voltage

reference exhibits a typical temperature coefficient

of

40ppm/°C

over

the

full

-40°C

to

+85°C

temperature range. An equivalent circuit for the

reference section is illustrated in Figure 1. Since the

output impedance of the voltage reference Is

typically 200k

Ω, its output can be bypassed with a

low-leakage

capacitor

and

is

stable

for

any

capacitive load.

An external buffer – such as the TS1001 – can be

used to buffer the voltage reference output for higher

output current drive or to reduce reference output

impedance.

APPLICATIONS INFORMATION

Low-Voltage, Low-Power Operation

Because they were designed specifically for low-

power, battery-operated applications, the TS9001-

1/2 comparators are an excellent choice. Under

nominal conditions, approximate operating times for

this analog comparator family is illustrated in Table 1

for

a

number

of

battery

types

and

their

corresponding charge capacities.

Internal Hysteresis

As a result of circuit noise or unintended parasitic

feedback, many analog comparators often break into

oscillation within their linear region of operation

especially when the applied differential input voltage

approaches 0V (zero volt). Externally-introduced

hysteresis

is

a

well-established

technique

to

stabilizing analog comparator behavior and requires

external components. As shown in Figure 2, adding

comparator hysteresis creates two trip points: VTHR

(for the rising input voltage) and VTHF (for the falling

input voltage). The hysteresis band (VHB) is defined

as the voltage difference between the two trip points.

When a comparator’s input voltages are equal,

hysteresis effectively forces one comparator input to

move quickly past the other input, moving the input

Table 1: Battery Applications using the TS9001

BATTERY TYPE

RECHARGEABLE

VFRESH

(V)

VEND-OF-LIFE (V)

CAPACITY, AA

SIZE (mA-h)

TS9001 OPERATING

TIME (hrs)

Alkaline (2 Cells)

No

3.0

1.8

2000

2.5 x 106

Nickel-Cadmium (2 Cells)

Yes

2.4

1.8

750

937,500

Lithium-Ion (1 Cell)

Yes

3.5

2.7

1000

1.25 x 106

Nickel-Metal- Hydride

(2 Cells)

Yes

2.4

1.8

1000

1.25 x 106

Figure 1: TS9001’s Internal VREF Output

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