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TSM917EUKT Datasheet(PDF) 10 Page - Silicon Laboratories

Part # TSM917EUKT
Description  1.8V Nanopower Comparator with Internal 1.245V Reference
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

TSM917EUKT Datasheet(HTML) 10 Page - Silicon Laboratories

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TSM917
Page 10
TSM917 Rev. 1.0
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 TSM917’s rail-to-rail
output stage implements a technique that virtually
eliminates
supply-current
surges
when
output
transitions occur. As shown on Page 4 of the Typical
Operating
Characteristics,
the
supply-current
change as a function of output transition frequency
exhibited by this analog comparator family 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.
TSM917’s Internal +1.245V VREF
The TSM917’s internal +1.245V voltage reference
exhibits
a
typical
temperature
coefficient
of
95ppm/°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 it was designed specifically for any low-
power, battery-operated application, the TSM917
analog comparator is an excellent choice. Under
nominal conditions, approximate operating times for
this analog comparator 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
Figure 1: TSM917’s Internal VREF Output
Equivalent Circuit
Table 1: Battery Applications using the TSM917
BATTERY TYPE
RECHARGEABLE
VFRESH
(V)
VEND-OF-LIFE (V)
CAPACITY, AA
SIZE (mA-h)
TSM917
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


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