MICROCHIP TC7652

TC7652
Low Noise, Chopper Stabilized Operational Amplifier
Features
General Description
•
•
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•
•
•
•
•
The TC7652 is a lower noise version of the TC7650,
sacrificing some input specifications (bias current and
bandwidth) to achieve a 10x reduction in noise. All the
other benefits of the chopper technique are present,
(i.e, freedom from offset adjust, drift and reliability problems from external trim components). Like the TC7650,
the TC7652 requires only two noncritical external caps
for storing the chopped null potentials. There are no
significant chopping spikes, internal effects or overrange lockup problems.
Low Offset Over Temperature Range: 10µV
Ultra Low Long Term Drift: 150nV/Month
Low Temperature Drift: 100nV/°C
Low DC Input Bias Current: 15pA
High Gain, CMRR and PSRR: 110dB Min
Low Input Noise Voltage: 0.2µVp-p (DC to 1Hz)
Internally Compensated for Unity Gain Operation
Clamp Circuit for Fast Overload Recovery
Applications
•
•
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Instrumentation
Medical Instrumentation
Embedded Control
Temperature Sensor Amplifier
Strain Gage Amplifier
Device Selection Table
Part Number
Package
Temperature
Range
TC7652CPA
8-Pin Plastic DIP
0°C to +70°C
TC7652CPD
14-Pin Plastic DIP
0°C to +70°C
Package Type
8-Pin DIP
CA
1
8 CB
-Input 2
+Input 3
7
TC7652CPA
VDD
6 Output
5 Output
Clamp
VSS 4
14-Pin DIP
CB 1
14 INT/EXT
CA 2
EXT CLK
13 In
12 INT CLK
Out
NC 3
-Input 4
TC7652CPD
+Input 5
11 VDD
10 Output
NC 6
9
Output
Clamp
VSS 7
8
CRETN
NC = No Internal Connection
(May Be Used As Input Guard)
 2002 Microchip Technology Inc.
DS21464B-page 1
TC7652
Functional Block Diagram
TC7652
14-Pin DIP Only
Output Clamp
(Not On "Z" Pinout)
Output Clamp
Circuit
INT/EXT
EXT CLK IN
CLK OUT
Oscillator
Main
Amplifier
A
Inputs
B
Output
CB
NULL
Intermod
Comparator
B
B
B
A
CA
NULL
Amplifier
A
NULL
CRETN (1)
VSS
NOTE 1: For 8-pin DIP connect to VSS, or to CRET on "Z" pinout.
DS21464B-page 2
 2002 Microchip Technology Inc.
TC7652
1.0
ELECTRICAL
CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS*
Total Supply Voltage (V DD to VSS) .......................+18V
Input Voltage .................... (VDD +0.3V) to (VSS – 0.3V)
*Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the
device at these or any other conditions above those indicated in the operation sections of the specifications is not
implied. Exposure to Absolute Maximum Rating conditions
for extended periods my affect device reliability.
Voltage on Oscillator Control Pins...............VDD to VSS
Duration of Output Short Circuit ..................... Indefinite
Current Into Any Pin............................................ 10mA
While Operating (Note 1)............................ 100µA
Package Power Dissipation (TA < 70°C)
8-Pin Plastic DIP ....................................... 730mW
14-Pin Plastic DIP ..................................... 800mW
Storage Temperature Range .............. -65°C to +150°C
Operating Temperature Range
C Device .......................................... 0°C to +70°C
I Device ......................................... -25°C to +85°C
TC7652 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VDD = +5V, VSS = -5V, TA = +25°C, unless otherwise indicated.
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
VOS
Input Offset Voltage
—
±2
±5
µV
TCV OS
Average Temperature Co-efficient of
Input Offset Voltage
—
0.01
0.05
µV/°C
VOS/DT
Offset Voltage vs Time
—
150
—
nV/mo
IBIAS
Input Bias Current (CLK On)
—
—
—
30
100
250
100
—
1000
pA
TA = +25°C
0°C < TA < +70°C
-25°C < TA < +85°C
IBIAS
Input Bias Current (CLK Off)
—
—
—
15
35
100
30
—
1000
pA
TA = +25°C
0°C < TA < +70°C
-25°C < TA < +85°C
IOS
Input Offset Current
—
25
150
pA
RIN
Input Resistance
—
1012
—
Ω
OL
Large Signal Voltage Gain
120
150
—
dB
RL = 10kΩ, VOUT = ±4V
VOUT
Output Voltage Swing (Note 2)
±4.7
—
±4.85
±4.95
—
—
V
RL = 10kΩ
RL = 100kΩ
CMVR
Common Mode Voltage Range
-4.3
—
+3.5
V
MRR
Common Mode Rejection Ratio
120
140
—
dB
PSRR
Power Supply
120
140
—
dB
eN
Input Noise Voltage
—
—
0.2
0.7
1.5
5
µVP-P
µVP-P
IN
Input Noise Current
—
0.01
—
pA/
√Hz
GBW
Unity Gain Bandwidth
—
0.4
—
MHz
SR
Slew Rate
—
1
—
Overshoot
—
15
—
%
Operating Supply Range
5
—
16
V
VDD , VSS
TA = +25°C
0°C < TA < +70°C
CMVR = -4.3V to +3.5V
±3V to ±8V
RS = 100Ω, DC to 1Hz
DC to 10Hz
f = 10Hz
V/µsec CL = 50pF, RL = 10kΩ
Note 1: Limiting input current to 100µA is recommended to avoid latch-up problems. Typically 1mA is safe however, this is not
guaranteed.
2: Output clamp not connected. See typical characteristics curves for output swing versus clamp current characteristics.
3: See “Output Clamp” under detailed description.
 2002 Microchip Technology Inc.
DS21464B-page 3
TC7652
TC7652 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: VDD = +5V, VSS = -5V, TA = +25°C, unless otherwise indicated.
Symbol
Parameter
Min
Typ
Max
Units
—
1
3
mA
Test Conditions
IS
Supply Current
fCH
Internal Chopping Frequency
100
275
—
Hz
Pins 12 – 14 Open (DIP)
Clamp ON Current (Note 3)
25
100
—
µA
RL = 100kΩ
Clamp OFF Current (Note 3)
—
1
—
pA
-4V ≤ VOUT < +10V
No Load
Note 1: Limiting input current to 100µA is recommended to avoid latch-up problems. Typically 1mA is safe however, this is not
guaranteed.
2: Output clamp not connected. See typical characteristics curves for output swing versus clamp current characteristics.
3: See “Output Clamp” under detailed description.
DS21464B-page 4
 2002 Microchip Technology Inc.
TC7652
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number
Symbol
Description
8-pin DIP
14-pin DIP
1,8
2,1
CA, CB
Nulling capacitor pins
2
4
-INPUT
Inverting Input
3
5
+INPUT
4
7
VSS
5
9
OUTPUT
CLAMP
6
10
OUTPUT
7
11
VDD
Positive Power Supply
—
3,6
NC
No internal connection
—
8
CRETN
—
12
INT CLK OUT
—
13
EXT CLK IN
—
14
INT/EXT
 2002 Microchip Technology Inc.
Non-inverting Input
Negative Power Supply
Output Voltage Clamp
Output
Capacitor current return pin
Internal Clock Output
External Clock Input
Select Internal or External Clock
DS21464B-page 5
TC7652
3.0
DETAILED DESCRIPTION
3.1
Capacitor Connection
FIGURE 3-1:
R2
1MΩ
Connect the null storage capacitors to the CA and C B
pins with a common connection to the CRET pin (14-pin
TC7652) or to VSS (8-pin TC7652). When connecting to
VSS, avoid injecting load current IR drops into the
capacitive circuitry by making this connection directly
via a separate wire or PC trace.
3.2
3.3
R1
1kΩ
Clock
The TC7652 has a 550Hz internal oscillator, which is
divided by two before clocking the input chopper
switches. The 275Hz chopping frequency is available
at INT CLK OUT (Pin 12) on 14-pin devices. In normal
operation, INT/EXT (Pin 14), which has an internal pullup, can be left open.
An external clock can also be used. To disable the
internal clock and use an external one, the INT/EXT pin
must be tied to V SS. The external clock signal is then
applied to the EXT CLK IN input (Pin 13). An internal
divide-by-two provides a 50% switching duty cycle. The
capacitors are only charged when EXT CLK IN is high,
so a 50% to 80% positive duty cycle is recommended
for higher clock frequencies. The external clock can
swing between VDD and VSS, with the logic threshold
about 2.5V below VDD.
The output of the internal oscillator, before the divideby-two circuit, is available at EXT CLK IN when INT/
EXT is high or unconnected. This output can serve as
the clock input for a second TC7652 (operating in a
master/slave mode), so that both op amps will clock at
the same frequency. This prevents clock intermodulation effects when two TC7652's are used in a differential amplifier configuration.
DS21464B-page 6
TC7652
+
C
R
Output
C
0.1µF
Output Clamp
In chopper stabilized amplifiers, the output clamp pin
reduces overload recovery time. When a connection is
made to the inverting input pin (summing junction), a
current path is created between that point and the output pin, just before the device output saturates. This
prevents uncontrolled differential input voltages and
charge build-up on correction storage capacitors. Output swing is reduced.
TEST CIRCUIT
0.1µF
If the TC7652's output saturates, error voltages on the
external capacitors will slow overload recovery. This
condition can be avoided if a strobe signal is available.
The strobe signal is applied to EXT CLK IN and the
overload signal is applied to the amplifier while the
strobe is LOW. In this case, neither capacitor will be
charged. The low leakage of the capacitor pins allow
long measurements to be made within eligible errors
(typical capacitor drift is 10µV/sec).
4.0
TYPICAL APPLICATIONS
4.1
Component Selection
C A and CB (external capacitors)should be in the 0.1µF
to 1µF range. For minimum clock ripple noise, use a
1µF capacitor in broad bandwidth circuits. For limited
bandwidth applications where clock ripple is filtered
out, use a 0.1µF capacitor for slightly lower offset voltage. High quality, film type capacitors (polyester or
polypropylene) are recommended, although a lower
grade ceramic may work in some applications. For
quickest settling after initial turn-on, use low dielectric
absorption capacitors (e.g., polypropylene). With
ceramic capacitors, settling to 1µV takes several seconds.
4.2
Static Protection
Although input diodes static protect all device pins,
avoid strong electrostatic fields and discharges that
can cause degraded diode junction characteristics and
produce increased input-leakage currents.
 2002 Microchip Technology Inc.
TC7652
4.3
with a 1kΩ load), and this lower gain is inconsequential.
For wide band, the best frequency response occurs
with a load resistor of at least 10kΩ. This produces a
6dB/octave response from 0.1Hz to 2MHz, with phase
shifts of less than 2 degrees in the transition region,
where the main amplifier takes over from the null amplifier.
Output Stage/Load Driving
The output circuit is high impedance (about 18kΩ).
With lesser loads, the chopper amplifier behaves
somewhat like a transconductance amplifier with an
open-loop gain proportional to load resistance. (For
example, the open-loop gain is 17dB lower with a 1kΩ.
load than with a 10kΩ load.) If the amp is used only for
DC, the DC gain is typically greater than 120dB (even
FIGURE 4-1:
CONNECTION OF INPUT GUARDS
Inverting Amplifier
R1
Follower
R2
Input
TC7652
TC7652
-
Output
+
Input
+
Output
Noninverting Amplifier
R2
TC7652
Output
+
R1
Input
4.4
Thermoelectric Effects
The thermoelectric (Seebeck) effects in thermocouple
junctions of dissimilar metals, alloys, silicon, etc. limit
ultra high precision DC amplifiers. Unless all junctions
are at the same temperature, thermoelectric voltages
around 0.1µV/°C (up to tens of µV/°C for some materials) are generated. To realize the low offset voltages of
the chopper, avoid temperature gradients. Enclose
components to eliminate air movement, especially from
power dissipating elements in the system. Where possible, use low thermoelectric co-efficient connections.
Keep power supply voltages and power dissipation to a
minimum. Use high impedance loads and seek maximum separation from surrounding heat disipating elements.
 2002 Microchip Technology Inc.
4.5
Guarding
To benefit from TC7652 low input currents, take care
assembling printed circuit boards. Clean boards with
alcohol or TCE and blow dry with compressed air. To
prevent contamination, coat boards with epoxy or silicone rubber.
Even if boards are cleaned and coated, leakage currents may occur because input pins are next to pins at
supply potentials. To reduce this leakage, use guarding
to lower the voltage difference between the inputs and
adjacent metal runs. The guard (a conductive ring surrounding inputs) is connected to a low impedance point
at about the same voltage as inputs. The guard
absorbs leakage currents from high voltage pins.
The 14-pin dual-in-line arrangement simplifies guarding. Like the LM108 pin configuration (but unlike the
101A and 741), pins next to inputs are not used.
DS21464B-page 7
TC7652
4.6
FIGURE 4-3:
Pin Compatibility
Where possible, the 8-pin device pinout conforms to
such industry standards as the LM101 and LM741. Null
storing external capacitors connect to Pins 1 and 8,
which are usually for offset null or compensation capacitors. Output clamp (Pin 5) is similarly used. For OP05
and OP07 devices, replacement of the offset null
potentiometer (connected between Pins 1 and 8 and
VDD by two capacitors from those pins to VSS) provides
compatibility. Replacing the compensation capacitor
between Pins 1 and 8 by two capacitors to VSS is
required. The same operation (with the removal of any
connection to Pin 5) works for LM101, µA748 and similar parts.
Because NC pins provide guarding between input and
other pins, the 14-pin device pinout conforms closely to
the LM108. Because this device does not use any extra
pins and does not provide offset nulling (but requires a
compensation capacitor), some layout changes are
necessary to convert to the TC7652.
4.7
R2
Input
Output
+
0.1µF
FIGURE 4-4:
0.1µF
USING 741 TO BOOST
OUTPUT DRIVE
CAPABILITY
TC7652
+15V
+
NONINVERTING
AMPLIFIER WITH
OPTIONAL CLAMP
0.1µF
TC7652
Input
TC7652
–
-7.5V
Figures 4-2 and 4-3 show basic inverting and noninverting amplifier circuits using the output clamping circuit to enhance overload recovery performance. The
only limitations on replacing other op amps with the
TC7652 are supply voltage (±8V maximum) and output
drive capability (10kΩ load for full swing). Overcome
these limitations with a booster circuit (Figure 4-4) to
combine output capabilities of the LM741 (or other
standard device) with input capabilities of the TC7652.
These two form a composite device, therefore, when
adding the feedback network, the monitor loop gains
stability.
0.1µF
Clamp
R1
Some Applications
FIGURE 4-2:
INVERTING AMPLIFIER
WITH OPTIONAL CLAMP
+
741
+
In
–
Out
–
-7.5V
-15V
0.1
µF
0.1
µF
10kΩ
Figure 4-5 shows the clamp circuit of a zero offset comparator. Because the clamp circuit requires the inverting input to follow the input signal, problems with a
chopper stabilized op amp are avoided. The threshold
input must tolerate the output clamp current ≈VIN/R
without disrupting other parts of the system.
Figure 4-6 shows how the TC7652 can offset null high
slew rate and wideband amplifiers.
Mixing the TC7652 with circuits operating at ±15V
requires a lower supply voltage divider with the TC7660
voltage converter circuit operated "backwards." Figure
4-7 shows an approximate connection.
Output
–
Clamp
R3
R2
FIGURE 4-5:
LOW OFFSET
COMPARATOR
0.1µF
R1
0.1µF
TC7652
VIN
+
VOUT
–
Clamp
VTH
200kΩ to 2mΩ
DS21464B-page 8
 2002 Microchip Technology Inc.
TC7652
FIGURE 4-6:
1437 OFFSET NULLED BY
TC7652
TC7652
+
–
22kΩ
22kΩ
+
Out
In
–
FIGURE 4-7:
Fast
Amplifier
SPLITTING +15V WITH
THE 7660 AT >95%
EFFICIENCY
2
8
+15V
TC7660
3
10µF
+7.5V
10µF
4
6
5
0V
1MW
 2002 Microchip Technology Inc.
DS21464B-page 9
TC7652
TYPICAL CHARACTERISTICS
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Supply Current
vs ± Supply Voltage
1400
Output Resistance
vs Output Voltage
0.1mA
-5.0
OUTPUT VOLTAGE (V)
1200
SUPPLY CURRENT (µA)
Positive Clamp Current
1 mA
1000
800
600
400
CLAMP CURRENT
5.0
SINK
-4.0
SOURCE
0.01mA
1µA
0.1µA
0.01µA
1nA
0.1nA
200
0.01nA
-3.0
0
2
3
4
5
6
7
± SUPPLY VOLTAGE (V)
8
100
Negative Clamp Current
1M
1pA
4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0
OUTPUT VOLTAGE (V)
Noise at 0.1Hz to 100Hz
Noise at 0.1Hz to 10Hz
1k
10k
100k
OUTPUT RESISTANCE (W)
1mA
2 µV/DIV
1µA
1 µV/DIV
CLAMP CURRENT
0.1mA
0.01mA
0.1µA
0.01µA
1nA
0.1nA
0.01nA
1 sec/DIV
1 sec/DIV
Slew Rate
Noise at 0.1Hz to 1Hz
Phase Gain (Bode Plot)*
60
GAIN
+240
+180
50
GAIN (dB)
0.5V/DIV
1 µV/DIV
40
30
20
10
PHASE
+120
+60
0
-60
PHASE (deg)
1pA
4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0
OUTPUT VOLTAGE (V)
-120
0
-180
-10
-20
1 sec/DIV
DS21464B-page 10
5 µsec/DIV
1
10 100
1k 10k 100k 1M
FREQUENCY (Hz)
*NOTE:
±5V, ±2.5V supplies; no load to 10k load.
 2002 Microchip Technology Inc.
TC7652
Input Offset Voltage vs Common Mode Voltage
4.0
INPUT OFFSET
VOLTAGE (µV)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
-6
-4
-2
0
2
4
COMMON MODE VOLTAGE (V)
 2002 Microchip Technology Inc.
DS21464B-page 11
TC7652
6.0
PACKAGING INFORMATION
6.1
Package Marking Information
Package marking information not available at this time.
6.2
Package Dimensions
8-Pin Plastic DIP
PIN 1
.260 (6.60)
.240 (6.10)
.045 (1.14)
.030 (0.76)
.070 (1.78)
.040 (1.02)
.310 (7.87)
.290 (7.37)
.400 (10.16)
.348 (8.84)
.200 (5.08)
.140 (3.56)
.040 (1.02)
.020 (0.51)
.150 (3.81)
.115 (2.92)
.110 (2.79)
.090 (2.29)
.015 (0.38)
.008 (0.20)
3˚MIN.
.400 (10.16)
.310 (7.87)
.022 (0.56)
.015 (0.38)
Dimensions: inches (mm)
14-Pin PDIP (Narrow)
PIN 1
.260 (6.60)
.240 (6.10)
.310 (7.87)
.290 (7.37)
.770 (19.56)
.745 (18.92)
.200 (5.08)
.140 (3.56)
.040 (1.02)
.020 (0.51)
.150 (3.81)
.115 (2.92)
.015 (0.38)
.008 (0.20)
3˚MIN.
.400 (10.16)
.310 (7.87)
.110 (2.79)
.090 (2.29)
.070 (1.78)
.045 (1.14)
.022 (0.56)
.015 (0.38)
Dimensions: inches (mm)
DS21464B-page 12
 2002 Microchip Technology Inc.
TC7652
SALES AND SUPPORT
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1.
2.
3.
Your local Microchip sales office
The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
 2002 Microchip Technology Inc.
DS21464B-page 13
TC7652
NOTES:
DS21464B-page 14
 2002 Microchip Technology Inc.
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property
rights.
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 2002 Microchip Technology Inc.
DS21464B - page 15
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Tri-Atria Office Building
32255 Northwestern Highway, Suite 190
Farmington Hills, MI 48334
Tel: 248-538-2250 Fax: 248-538-2260
Kokomo
2767 S. Albright Road
Kokomo, Indiana 46902
Tel: 765-864-8360 Fax: 765-864-8387
Los Angeles
18201 Von Karman, Suite 1090
Irvine, CA 92612
Tel: 949-263-1888 Fax: 949-263-1338
China - Chengdu
Microchip Technology Consulting (Shanghai)
Co., Ltd., Chengdu Liaison Office
Rm. 2401, 24th Floor,
Ming Xing Financial Tower
No. 88 TIDU Street
Chengdu 610016, China
Tel: 86-28-6766200 Fax: 86-28-6766599
China - Fuzhou
Microchip Technology Consulting (Shanghai)
Co., Ltd., Fuzhou Liaison Office
Unit 28F, World Trade Plaza
No. 71 Wusi Road
Fuzhou 350001, China
Tel: 86-591-7503506 Fax: 86-591-7503521
China - Shanghai
Microchip Technology Consulting (Shanghai)
Co., Ltd.
Room 701, Bldg. B
Far East International Plaza
No. 317 Xian Xia Road
Shanghai, 200051
Tel: 86-21-6275-5700 Fax: 86-21-6275-5060
China - Shenzhen
150 Motor Parkway, Suite 202
Hauppauge, NY 11788
Tel: 631-273-5305 Fax: 631-273-5335
Microchip Technology Consulting (Shanghai)
Co., Ltd., Shenzhen Liaison Office
Rm. 1315, 13/F, Shenzhen Kerry Centre,
Renminnan Lu
Shenzhen 518001, China
Tel: 86-755-2350361 Fax: 86-755-2366086
San Jose
Hong Kong
Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Tel: 408-436-7950 Fax: 408-436-7955
Microchip Technology Hongkong Ltd.
Unit 901-6, Tower 2, Metroplaza
223 Hing Fong Road
Kwai Fong, N.T., Hong Kong
Tel: 852-2401-1200 Fax: 852-2401-3431
New York
Toronto
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699 Fax: 905-673-6509
India
Microchip Technology Inc.
India Liaison Office
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Korea
Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea 135-882
Tel: 82-2-554-7200 Fax: 82-2-558-5934
Singapore
Microchip Technology Singapore Pte Ltd.
200 Middle Road
#07-02 Prime Centre
Singapore, 188980
Tel: 65-6334-8870 Fax: 65-6334-8850
Taiwan
Microchip Technology Taiwan
11F-3, No. 207
Tung Hua North Road
Taipei, 105, Taiwan
Tel: 886-2-2717-7175 Fax: 886-2-2545-0139
EUROPE
Denmark
Microchip Technology Nordic ApS
Regus Business Centre
Lautrup hoj 1-3
Ballerup DK-2750 Denmark
Tel: 45 4420 9895 Fax: 45 4420 9910
France
Microchip Technology SARL
Parc d’Activite du Moulin de Massy
43 Rue du Saule Trapu
Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Germany
Microchip Technology GmbH
Gustav-Heinemann Ring 125
D-81739 Munich, Germany
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
Italy
Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883
United Kingdom
Arizona Microchip Technology Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
03/01/02
DS21464B-page 16
 2002 Microchip Technology Inc.