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PDF TC1043 Data sheet ( Hoja de datos )
| Número de pieza | TC1043 | |
| Descripción | Low Power Voltage Reference | |
| Fabricantes | Microchip Technology | |
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TC1043
Linear Building Block – Low Power Voltage Reference with
Dual Op Amp, Dual Comparator, and Shutdown Mode
Features
• Combines Two Op Amps, Two Comparators and
a Voltage Reference in a Single Package
• Optimized for Single-Supply Operation
• Small Package: 16-Pin QSOP
• Ultra Low Input Bias Current: Less than 100pA
• Low Quiescent Current: Operating 16µA (Typ.)
Shutdown 6µA (Typ.)
• Rail-to-Rail Inputs and Outputs
• Operates Down to VDD = 1.8V
• Reference and One Comparator Remain Active in
Shutdown to Provide Supervisory Functions
Applications
• Power Management Circuits
• Battery Operated Equipment
• Consumer Products
• Replacements for Discrete Components
Device Selection Table
Part Number
TC1043CEQR
Package
16-Pin QSOP
Temperature
Range
-40°C to +85°C
Package Type
16-Pin QSOP
A1IN+ 1
A1IN– 2
A2IN+ 3
A2IN– 4
C1OUT 5
C2OUT 6
SHDN 7
VSS 8
16 VDD
15 A1OUT
14 A2OUT
13 C1IN+
12 C1IN–
11 C2IN+
10 C2IN–
9 VREF
General Description
The TC1043 is a mixed-function device combining two
general purpose op amps, two general purpose com-
parators, and a voltage reference in a single 16-Pin
package.
This increased integration allows the user to replace
two or three packages, saving space, lowering supply
current, and increasing system performance. A shut-
down input, SHDN, disables the op amps and one of
the comparators, placing their outputs in a high-imped-
ance state. The reference and one comparator stay
active in shutdown mode. Standby power consumption
is typically 6µA. Both the op amps and comparators
have rail-to-rail inputs and outputs which allows opera-
tion from low supply voltages with large input and out-
put signal swings.
Packaged in a 16-Pin QSOP, the TC1043 is ideal for
applications requiring high integration, small size and
low power.
© 2002 Microchip Technology Inc.
DS21347B-page 1
1 page  
3.0 DETAILED DESCRIPTION
The TC1043 is one of a series of very low power, linear
building block products targeted at low voltage, single
supply applications. The TC1043 minimum operating
voltage is 1.8V and typical supply current is only 20µA
(fully enabled). It combines two comparators, two op
amps and a voltage reference in a single package. A
shutdown mode is incorporated for easy adaptation to
system power management schemes. During shut-
down, all but one comparator and the voltage reference
are disabled (i.e. powered down with their respective
outputs at high impedance). The “still awake” compar-
ator and voltage reference can be used as a wake-up
timer, power supply monitor, LDO controller or other
continuous duty circuit function.
3.1 Comparators
The TC1043 contains two comparators. The compara-
tors input range extends beyond both supply voltages
by 200mV and the outputs will swing to within several
millivolts of the supplies, depending on the load current
being driven.
The comparators exhibit a propagation delay and sup-
ply current which are largely independent of supply
voltage. The low input bias current and offset voltage
make them suitable for high impedance precision appli-
cations.
Comparator CMPTR1 is disabled during shutdown and
has a high impedance output. Comparator CMPTR2
remains active.
3.2 Operational Amplifiers
The TC1043 contains two rail-to-rail op amps. The
amplifiers’ input range extends beyond both supplies
by 200mV and the outputs will swing to within several
millivolts of the supplies depending on the load current
being driven.
The amplifier design is such that large signal gain, slew
rate and bandwidth are largely independent of supply
voltage. The low input bias current and offset voltage of
the TC1043 make it suitable for precision applications.
Both op amps are disabled during shutdown and have
high output impedance.
3.3 Voltage Reference
A 2.0% tolerance, internally biased, 1.20V bandgap
voltage reference is included in the TC1043. It has a
push-pull output capable of sourcing and sinking at
least 50µA. The voltage reference remains fully
enabled during shutdown.
TC1043
3.4 Shutdown Input
SHDN at VIL disables both op amps and one compara-
tor. The SHDN input cannot be allowed to float. When
not used, connect it to VDD. The disabled comparator’s
output and the two disabled op amp outputs are in a
high impedance state when shutdown is active. The
disabled comparator’s inputs and the two disabled op
amp inputs can be driven from rail-to-rail by an external
voltage when the TC1043 is in shutdown. No latch-up
will occur when the device is driven to its enabled state
when SHDN is set to VIH.
© 2002 Microchip Technology Inc.
DS21347B-page 5
5 Page 
TC1043
FIGURE 4-8:
VC
PULSE WIDTH MODULATOR
VDD
R1
R6 100k
10k
TC1043
R4
VDD
–
C1 +
R2
100k
R3
100k
Comparator
VH =
VDD (R1R2R6 + R2R3R6) + VC (R1R2R3)
R1R2R6 + R1R3R6 + R2R3R6 + R1R2R3
VL =
VDD (R2R3R6) + VC (R1R2R3)
R1R2R6 + R1R3R6 + R2R3R6 + R1R2R3
1
FREQ =
2 (0.694) (R4) (C1)
For Square Wave Generation,
Select R1 = R2 = R3
VC
=
VDD
2
FIGURE 4-9:
MULTI-POLE BUTTERWORTH VOICE BAND RECEIVE FILTER
Gain = 0 dB
Fch = 3.5kHz
-24 dB/Octave
Fcl = 70Hz
+6 dB/Octave
Passband Ripple
< 0.15 dB
TC1043
VDD /2
0.1 µF
22.6k
VDD
+
–
22.6k
6800 pF
750 pF
VOUT
VIN
21.0k
2400 pF
21.0k
21.0k
470 pF
VDD
+
–
Two (2) TC1043 Op Amps
© 2002 Microchip Technology Inc.
DS21347B-page 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TC1043.PDF ] | |
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