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PDF HA7210 Data sheet ( Hoja de datos )
| Número de pieza | HA7210 | |
| Descripción | 10kHz to 10MHz Low Power Crystal Oscillator | |
| Fabricantes | Intersil Corporation | |
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®
NOT
RECOMMENDED
FOR
NEW
DESIGNS
Data Sheet
August 5, 2005
HA7210
FN3389.11
10kHz to 10MHz, Low Power Crystal
Oscillator
The HA7210 is a very low power crystal-controlled oscillators
that can be externally programmed to operate between 10kHz
and 10MHz. For normal operation it requires only the addition
of a crystal. The part exhibits very high stability over a wide
operating voltage and temperature range.
The HA7210 also features a disable mode that switches the
output to a high impedance state. This feature is useful for
minimizing power dissipation during standby and when
multiple oscillator circuits are employed.
Ordering Information
PART NUMBER TEMP.
(BRAND)
RANGE (°C)
PACKAGE
PKG.
DWG. #
HA7210IP
-40 to 85 8 Ld PDIP
E8.3
HA7210IB
(H7210I)
-40 to 85 8 Ld SOIC
M8.15
HA7210IBZ
(7210IBZ) (Note)
-40 to 85 8 Ld SOIC (Pb-free) M8.15
HA7210IBZ96
(7210IBZ) (Note)
-40 to 85 8 Ld SOIC (Pb-free) M8.15
Tape and Reel
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Pinout
HA7210
(PDIP, SOIC)
TOP VIEW
VDD 1
OSC IN 2
OSC OUT 3
VSS 4
8 ENABLE
7 FREQ 2
6 FREQ 1
5 OUTPUT
Features
• Single Supply Operation at 32kHz . . . . . . . . . . . . 2V to 7V
• Operating Frequency Range . . . . . . . . . .10kHz to 10MHz
• Supply Current at 32kHz . . . . . . . . . . . . . . . . . . . . . . .5µA
• Supply Current at 1MHz. . . . . . . . . . . . . . . . . . . . . .130µA
• Drives 2 CMOS Loads
• Only Requires an External Crystal for Operation
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Battery Powered Circuits
• Remote Metering
• Embedded Microprocessors
• Palm Top/Notebook PC
• Related Literature
- AN9334, Improving HA7210 Start-Up Time
Typical Application Circuit
0.1µF VDD
32.768kHz
CRYSTAL
18
27
HA7210
36
45
(NOTE 1)
32.768kHz
CLOCK
32.768kHz MICROPOWER CLOCK OSCILLATOR
NOTE:
1. Internal pull-up resistors provided on EN, FREQ1, and FREQ2
inputs.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 1999-2005. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
HA7210
Crystal Selection
For general purpose applications, a Parallel Mode Crystal is
a good choice for use with the HA7210. However for
applications where a precision frequency is required, the
designer needs to consider other factors.
Crystals are available in two types or modes of oscillation,
Series and Parallel. Series Mode crystals are manufactured
to operate at a specified frequency with zero load
capacitance and appear as a near resistive impedance when
oscillating. Parallel Mode crystals are manufactured to
operate with a specific capacitive load in series, causing the
crystal to operate at a more inductive impedance to cancel
the load capacitor. Loading a crystal with a different
capacitance will “pull” the frequency off its value.
The HA7210 has 4 operating frequency ranges. The higher
three ranges do not add any loading capacitance to the
oscillator circuit. The lowest range, 10kHz to 100kHz,
automatically switches in two 15pF capacitors onto OSC IN
and OSC OUT to eliminate potential start-up problems.
These capacitors create an effective crystal loading
capacitor equal to the series combination of these two
capacitors. For the HA7210 in the lowest range, the effective
loading capacitance is 7.5pF. Therefore the choice for a
crystal, in this range, should be a Parallel Mode crystal that
requires a 7.5pF load.
In the higher 3 frequency ranges, the capacitance on OSC
IN and OSC OUT will be determined by package and layout
parasitics, typically 4 to 5pF. Ideally the choice for crystal
should be a Parallel Mode set for 2.5pF load. A crystal
manufactured for a different load will be “pulled” from its
nominal frequency (see Crystal Pullability).
+5V
C1
C2
2 XTAL C3
OSC IN
3
OSC OUT
1
VDD
+
-
VREG
HA7210
FIGURE 2.
Frequency Fine Tuning
Two Methods will be discussed for fine adjustment of the
crystal frequency. The first and preferred method (Figure 2),
provides better frequency accuracy and oscillator stability
than method two (Figure 3). Method one also eliminates
start-up problems sometimes encountered with 32kHz
tuning fork crystals.
For best oscillator performance, two conditions must be met:
the capacitive load must be matched to both the inverter and
crystal to provide ideal conditions for oscillation, and the
frequency of the oscillator must be adjustable to the desired
frequency. In Method two these two goals can be at odds
with each other; either the oscillator is trimmed to frequency
by de-tuning the load circuit, or stability is increased at the
expense of absolute frequency accuracy.
Method one allows these two conditions to be met
independently. The two fixed capacitors, C1 and C2, provide
the optimum load to the oscillator and crystal. C3 adjusts the
frequency at which the circuit oscillates without appreciably
changing the load (and thus the stability) of the system.
Once a value for C3 has been determined for the particular
type of crystal being used, it could be replaced with a fixed
capacitor. For the most precise control over oscillator
frequency, C3 should remain adjustable.
This three capacitor tuning method will be more accurate
and stable than method two and is recommended for 32kHz
tuning fork crystals; without it they may leap into an overtone
mode when power is initially applied.
Method two has been used for many years and may be
preferred in applications where cost or space is critical. Note
that in both cases the crystal loading capacitors are
connected between the oscillator and VDD; do not use VSS
as an AC ground. The Simplified Block Diagram shows that
the oscillating inverter does not directly connect to VSS but is
referenced to VDD and VRN. Therefore VDD is the best AC
ground available.
+5V
C1 XTAL C2
2
OSC IN
3
OSC OUT
HA7210
1
VDD
+
-
VREG
FIGURE 3.
Typical values of the capacitors in Figure 2 are shown
below. Some trial and error may be required before the best
combination is determined. The values listed are total
capacitance including parasitic or other sources. Remember
that in the 10kHz to 100kHz frequency range setting the
HA7210 switches in two internal 15pF capacitors.
CRYSTAL
FREQUENCY
32kHz
1MHz
2MHz
4MHz
LOAD CAPS
C1, C2
33pF
33pF
25pF
22pF
TRIMMER CAP
C3
5pF to 50pF
5pF to 50pF
5pF to 50pF
5pF to 100pF
5
5 Page 
HA7210
Typical Performance Curves (Continued)
30
32kHz
25 1MHz
20 5MHz
10MHz
15
10
5
0
-5
-10
-15
-20
2
DEVIATION FROM FREQUENCY AT 5.0V
4
VDD SUPPLY VOLTAGE (V)
6
FIGURE 29. FREQUENCY CHANGE vs VDD
VDD = 5V, CL = 30pF, GENERATOR (1VP-P) (NOTE)
6
5
4 fIN = 5MHz, F1 = 0, F2 = 0
3
2
1
0
-100
fIN = 100kHz, F1 = 1, F2 = 1
-50 0
50 100
TEMPERATURE (oC)
FIGURE 30. EDGE JITTER vs TEMPERATURE
150
fIN = 5MHz, F1 = 0, F2 = 0, CL = 30pF, VDD = 5V
13
12 tf GENERATOR (1VP-P) (NOTE)
11
10
9
8
7 tf XTAL AT 25oC
6
5 tr GENERATOR (1VP-P) (NOTE)
4
tr XTAL AT 25oC
3
2
-100
-50
0
50 100 150
TEMPERATURE (oC)
FIGURE 31. RISE/FALL TIME vs TEMPERATURE
fIN = 100kHz, F1 = 1, F2 = 1, CL = 30pF, VDD = 5V
12
11 tf GENERATOR (1VP-P) (NOTE)
10
9 tr GENERATOR (1VP-P) (NOTE)
8 tf XTAL AT 25oC
7
6
5 tr XTAL AT 25oC
4
3
2
-100
-50 0 50 100
TEMPERATURE (oC)
150
FIGURE 32. RISE/FALL TIME vs TEMPERATURE
VDD = 5V, GENERATOR (1VP-P) (NOTE)
30
tf (fIN = 100kHz)
25
tf (fIN = 5MHz)
tr
20 (fIN = 5MHz)
tr (fIN = 100kHz)
15
10
5
10 20 30 40 50 60 70 80 90 100 110
CL (pF)
FIGURE 33. RISE/FALL TIME vs CL
NOTE: Refer to Test Circuit (Figure 1).
11
15
14
13
12
11
10
9
8
7
6
5
4
2
CL = 18pF, GENERATOR (1VP-P) (NOTE)
tf (fIN = 5MHz)
tf (fIN = 100kHz)
tr (fIN = 5MHz)
tr (fIN = 100kHz)
345678
VDD (+V)
FIGURE 34. RISE/FALL TIME vs VDD
9
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet HA7210.PDF ] | |
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