LTC1706EMS-85 [Linear]
VID Voltage Programmer for Intel VRM 8.5; VID电压编程英特尔VRM 8.5
| 型号： | LTC1706EMS-85 |
| 厂家： | 
Linear |
| 描述： | VID Voltage Programmer for Intel VRM 8.5 |
| 文件： | 总8页 (文件大小：171K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1706-85
VID Voltage Programmer
for Intel VRM 8.5
U
FEATURES
DESCRIPTIO
The LTC®1706-85 is a precision, digitally programmed
resistive ladder which adjusts the output of any 0.8V-
referenced regulator. Depending on the state of the five
VID inputs, an output voltage between 1.05V and 1.825V
is programmed in 25mV increments.
■
Fully Compliant with the Intel VRM 8.5 VID
Specification
■
Programs Regulator Output Voltage from 1.05V to
1.825V in 25mV Steps
■
Programs an Entire Family of Linear Technology
DC/DC Converters with 0.8V References
±0.25% Voltage Programming Accuracy
The LTC1706-85 is designed specifically to program an
entirefamilyofLinearTechnologyDC/DCconvertersinfull
compliancewiththeIntelVoltageRegulatorModule(VRM)
8.5 specification.
■
■
Built-In 40k Pull-Up Resistors on Program Inputs
Available in MSOP-10 Packaging
■
U
The LTC1706-85 programs the following Linear Technol-
ogy DC/DC converter products: LTC1622, LTC1628,
LTC1629, LTC1702, LTC1735, LTC1735-1, LTC1772,
LTC1773, LTC1778, LTC1929, LTC3728 and LTC3729.
APPLICATIO S
■
Server/Desktop Computers
■
Multiprocessor Workstations and Servers
■
Multiphase Processor Power Supply
Consult factory for additional DC/DC converter products
compatible with the LTC1706-85.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
U
TYPICAL APPLICATIO
VID Controlled High Current 4-Phase DC/DC Converter (Simplified Block Diagram)
V
IN
4.5V TO 22V
+
–
V
V
OS
V
OS
IN
TG1
SW1
INTV
CC
R
R
V
SENSE1
SENSE2
OUT
1.05V TO 1.825V
UP TO 80A
V
CC
LTC1629
VID25
VID0
VID1
VID2
VID3
+
BG1
C
OUT
SENSE
V
V
DIFFOUT
SGND
IN
PGND
FROM
µP
LTC1706-85
GND
TG2
SW2
BG2
FB
EAIN
I
TH
CLKOUT
V
IN
4.5V TO 22V
PLLIN
V
IN
LTC1929
TG1
SW1
R
SENSE3
BG1
V
IN
PGND
SGND
EAIN
TG2
SW2
BG2
R
SENSE4
I
TH
NOTE: UP TO SIX LTC1629s/LTC1929s CAN BE PARALLELED
TO DELIVER AS MUCH AS 200A
1706-85 TA01
170685f
1
LTC1706-85
W W U W
U
W
U
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Notes 1, 2)
ORDER PART
Input Supply Voltage (VCC) ..........................–0.3V to 7V
VID Input Pins .............................................–0.3V to 7V
SENSE Pin ...................................................–0.3V to 7V
FB Pin ..........................................................–0.3V to 7V
Operating Temperature Range (Note 3) .. –40°C to 85°C
Junction Temperature........................................... 110°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
NUMBER
TOP VIEW
VID25
VID0
VID1
VID2
1
2
3
4
5
10 FB
LTC1706EMS-85
9
8
7
6
GND
NC
VID3
SENSE
V
CC
MS
MS PACKAGE
10-LEAD PLASTIC MSOP
PART MARKING
TJMAX = 110°C, θJA = 200°C/W
LTYQ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
2.7V ≤ VCC ≤ 5.5V, VID25 = VID0 = VID1 = VID2 = VID3 = NC unless otherwise noted. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
5.5
10
UNITS
V
V
Operating Supply Voltage Range
Supply Current
2.7
CC
I
(Note 4)
1
µA
kΩ
%
VCC
R
FB1
Resistance Between SENSE and FB
Output Voltage Accuracy
●
●
6
–0.25
28
10
14
V
1.050 ≤ V
≤ 1.825V
SENSE
0.25
56
OUT(ERROR)
R
Pull-Up Resistance on VID
V
V
V
V
= 0.6V (Note 5)
DIODE
40
kΩ
V
PULLUP
V
V
Minimum High Level Input Voltage (VID Inputs)
Maximum Low Level Input Voltage (VID Inputs)
Input Leakage Current (VID Inputs)
= 3.3V
2
IH
IL
CC
CC
CC
= 3.3V
< VID < 7V (Note 5)
0.8
V
I
0.01
±1
µA
IN
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
depending on the number of grounded VID lines. Each grounded VID line
will draw approximately [(V – 0.6)/40]mA. If the VID inputs are left
CC
unconnected, they will float to V at a rate controlled by parasitic
capacitance. Until the VID inputs reach their final states, slightly higher
CC
Note 2: All voltages are with respect to GND pin.
Note 3: The LTC1706-85 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 4: Supply current is specified with all VID inputs floating. Due to the
internal pull-ups on the VID pins, the supply current will increase
I
current may be observed. (See the Operation section for more detail.)
VCC
Note 5: Each built-in pull-up resistor attached to the VID inputs also has a
series diode connected to V to allow input voltages higher than the V
CC
CC
supply without damage or clamping. (See Operation section for further
details.)
170685f
2
LTC1706-85
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Typical Error % vs Temperature
Typical Error % vs Output Voltage
0.25
0.25
T
A
= 25°C
V
OUT
= 1.05V
V
OUT
= 1.325V
V
OUT
= 1.825V
0
0
–0.25
–0.25
1.0
1.2
1.4
1.6
1.8
–50
0
50
100
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
1706-85 G01
1706-85 G02
VID Pullup Current vs Temperature
RFB1 vs Temperature
10.10
10.05
10.00
9.95
70
65
60
55
V
= 3.3V
CC
VID PIN UNDER TEST = 0V
9.90
–50
0
50
100
–50
0
50
100
TEMPERATURE (°C)
TEMPERATURE (°C)
1706-85 G03
1706-85 G04
Supply Current vs Temperature
Supply Current vs Supply Voltage
1.0
0.5
0
1.0
0.5
0
ALL VID INPUTS OPEN
A
ALL VID INPUTS OPEN
T
= 25°C
V
= 5V
CC
V
CC
= 3.3V
= 2.7V
V
CC
–50
0
50
100
2.5 3.0
3.5 4.0
4.5 5.0 5.5 6.0
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
1706-85 G05
1706-85 G06
170685f
3
LTC1706-85
U
U
U
PI FU CTIO S
VID25 (Pin 1): Programming Input. GND = LOW,
SENSE (Pin 6): Regulator Output Voltage. Connect di-
rectly to regulator output sense node or VDIFFOUT when
used with the LTC1929 or LTC1629.
V
CC or Float = HIGH. Refer to Table 1 for programming
information. Connect to associated VID pin of µP.
VID0 (Pin 2): Programming Input. GND = LOW,
VID3 (Pin 7): Programming Input. GND = LOW,
V
CC or Float = HIGH. Refer to Table 1 for programming
VCC or Float = HIGH. Refer to Table 1 for programming
information. Connect to associated VID pin of µP.
information. Connect to associated VID pin of µP.
VID1 (Pin 3): Programming Input. GND = LOW,
NC (PIN 8): No Connect.
V
CC or Float = HIGH. Refer to Table 1 for programming
GND (Pin 9): Ground. Connect to regulator signal ground.
information. Connect to associated VID pin of µP.
FB(Pin10):FeedbackInput. Connecttothe0.8Vfeedback
pin of a compatible regulator or the EAIN pin of the
LTC1929 or LTC1629.
VID2 (Pin 4): Programming Input. GND = LOW,
V
CC or Float = HIGH. Refer to Table 1 for programming
information. Connect to associated VID pin of µP.
VCC (Pin 5): Power Supply Voltage. May range from 2.7V
to 5.5V.
W
BLOCK DIAGRA
V
V
V
V
CC
CC
CC
CC
40k
40k
40k
40k
VID25
VID0
VID1
VID2
1
2
3
4
V
CC
5
6
10
9
SENSE
FB
R
FB1
10k
SWITCH
CONTROL
LOGIC
R
FB2
GND
1706-85 BD
V
CC
40k
VID3
7
170685f
4
LTC1706-85
U
OPERATIO
The LTC1706-85 is a precision programmable resistive
divider designed specifically for use with an entire family
ofLinearTechnologyCorporationDC/DCswitchingregu-
latorswith0.8Vinternalreferenceandfeedbackvoltages.
The LTC1706-85 programs an output voltage ranging
from 1.050V to 1.825V in 25mV steps, depending on the
state of the VID input pins. The LTC1706-85 in conjunc-
tion with a Linear Technology DC/DC switching regulator
can be used to create a high performance voltage regu-
lator meeting all the requirements of the Intel VRM 8.5
specification.
input should be grounded or driven to a low state. The
VID inputs must be driven with a maximum VIL of 0.8V
(VCC = 3.3V).
When a VID input is grounded or pulled low with a logic
gate, the power supply current will increase because of
the resistor from VCC through the series diode to the
input. This increase in current is calculated from:
IQ = N • (VCC – VDIODE)/RPULLUP
where N is the number of grounded VID inputs. With
typical values of VCC = 3.3V, VDIODE = 0.6V and RPULLUP
= 40k, each grounded VIN input will sink approximately
68µA.
Voltage Sensing and Feedback Pins
The LTC1706-85 operates by closing the loop between
the output node and the feedback node of the regulator
with an appropriate resistive divider network. The “top”
feedback resistor, RFB1, connected between SENSE and
FB,isafixedvalueoftypically10k.The“bottom”feedback
resistor, RFB2, is set by the five VID inputs to generate the
desiredregulatoroutputvoltage. FeedbackresistorsRFB1
and RFB2 are matched and temperature stable in order to
provide a highly accurate output voltage.
Toapplyadigitalhighstatetheinputcanbeeitherfloated,
connectedtoVCC ordrivenbyalogicgate. TheVIDinputs
should be driven with a minimum VIH of 2V (VCC = 3.3V).
Because of the diode between VCC and the pull-up resis-
tor,themaximumVIHisnotlimitedtoVCC.TheVIDinputs
can be driven higher than VCC without being clamped or
damaged. This allows the LTC1706-85 to be fully logic
compatible and operational over a wide input voltage
range, up to the 7V absolute maximum rating.
The FB pin is a sensitive node in the circuit. Care should
be taken to minimize the layout distance between the
LTC1706-85FBnodeandtheregulatorfeedbacknode. In
addition, it is important to keep tight ground connections
between the two chips.
When used with the LTC1629 and LTC1929, the
LTC1706-85’s FB, SENSE, VCC and GND pins should be
connected respectively to the EAIN, VDIFFOUT, INTVCC and
SGNDpinsoftheLTC1629andLTC1929.Theresultofthis
application is a precisely controlled, multiphase, variable
output voltage supply applicable to any low output voltage
system such as a personal computer, workstation or
network server.
VID Inputs
The desired output voltage is obtained by applying the
proper voltage or float condition to the five digital VID
inputs. Table 1 shows the translation table with each in-
putstateandthecorrespondingregulatoroutputvoltage.
This translation is derived from and adheres to the Intel
VRM 8.5 specification.
In addition to the LTC1629 and LTC1929, the LTC1706-85
also programs a whole family of LTC DC/DC converters
that have an onboard 0.8V reference. The LTC1628,
LTC1735 and LTC1622 are just a few of the high efficiency
step-down switching regulators that will work equally well
with the LTC1706-85. Contact LTC Marketing for a more
complete listing of compatible DC/DC regulators.
EachVIDinputispulledupbya40kresistorinserieswith
a diode connected to VCC. To produce a digital low a VID
170685f
5
LTC1706-85
U
OPERATIO
Table 1. VID Inputs and Corresponding Output Voltage
CODE
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
VID3
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
VID2
GND
GND
GND
GND
GND
GND
GND
GND
Float
Float
Float
Float
Float
Float
Float
Float
VID1
GND
GND
GND
GND
Float
Float
Float
Float
GND
GND
GND
GND
Float
Float
Float
Float
VID0
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
VID25
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
VOLTAGE
1.250
1.275
1.200
1.225
1.150
1.175
1.100
1.125
1.050
1.075
1.800
1.825
1.750
1.775
1.700
1.725
CODE
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
VID3
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
VID2
GND
GND
GND
GND
GND
GND
GND
GND
Float
Float
Float
Float
Float
Float
Float
Float
VID1
GND
GND
GND
GND
Float
Float
Float
Float
GND
GND
GND
GND
Float
Float
Float
Float
VID0
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
VID25
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
VOLTAGE
1.650
1.675
1.600
1.625
1.550
1.575
1.500
1.525
1.450
1.475
1.400
1.425
1.350
1.375
1.300
1.325
U
TYPICAL APPLICATIO S
30A, 2-Phase VID Controlled Power Supply
V
IN
12V
OPTIONAL SYNC
CLOCK IN
10Ω 10Ω
L1
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
3
1
4
2
RUN/SS
SENSE1
SENSE1
EAIN
NC
TG1
5V
+
–
0.003Ω
0.33µF
3
SW1
1000pF
0.47µF
4
D1
M1
BOOST1
MBRS
340T3
10Ω
5
5
PLLFLTR
PLLIN
NC
V
M2
M3
IN
V
CC
6
1
2
3
4
7
0.33µF
BG1
VID25
VID0
VID1
VID2
VID3
7
22µF
1µF
16V
6
150µF, 16V
× 2
SENSE
EXTV
CC
6.3V
+
V
OUT
3300pF
100pF
D7
D8
100pF
8
LTC1929
I
× 5
180µF
4V
1.05V TO
1.825V
30A
+
TH
INTV
CC
FROM
µP
10k
9
1µF
6.3V
+
GND
LTC1706-85
SGND
PGND
BG2
10
11
12
13
14
V
DIFFOUT
10
–
FB
D2
V
OS
M4
BOOST2
SW2
MBRS
340T3
0.47µF
+
V
OS
M5
GND
9
M6
1000pF
–
+
SENSE2
SENSE2
TG2
1
2
AMPMD
3
4
0.003Ω
V
V
: 12V
IN
L2
: 1.05V TO 1.825, 30A
OUT
10Ω
10Ω
M1 TO M6: FDS7760A
L1 TO L2: 1µH SUMIDA CEP125-IROMC-H
24k
75k
D7 TO D10: CENTRAL CMDSH-3TR
C
: PANASONIC EEFUEOG181R
OUT
170685f
6
LTC1706-85
U
TYPICAL APPLICATIO S
VID Controlled High Current 70A 4-Phase Power Supply
OPTIONAL SYNC
CLOCK IN
10Ω
10Ω
L1
1
2
3
4
5
6
7
28
27
26
25
24
23
22
21
20
19
18
17
16
15
0.002Ω
3
4
2
RUN/SS
CLKOUT
TG1
5V
1
+
–
SENSE1
SENSE1
EAIN
0.33µF
SW1
1000pF
0.47µF
D1
MBRS
340T3
M1
BOOST1
10Ω
5
PLLFLTR
PLLIN
NC
V
M2
M3
IN
V
CC
1
2
3
4
7
0.33µF
BG1
VID25
VID0
VID1
VID2
VID3
LTC1629
1µF
16V
6
150µF, 16V
× 2
22µF
SENSE
EXTV
CC
D7
D8
+
V
OUT
3300pF
100pF
6.3V
8
100pF
I
× 3
1.05V TO
1.825V
70A
+
TH
INTV
CC
FROM
µP
10k
9
1µF
6.3V
470µF, 6.3V
+
GND
LTC1706-85
SGND
PGND
BG2
KEMET CAP
10
11
12
13
14
V
DIFFOUT
–
+
10
V
V
OS
–
FB
D2
MBRS
340T3
V
M4
OS
BOOST2
SW2
0.47µF
OS
+
V
OS
M5
GND
9
M6
1000pF
–
+
SENSE2
SENSE2
TG2
1
3
2
4
AMPMD
0.002Ω
L2
L3
10Ω
10Ω
10Ω
24k
75k
10Ω
1
2
3
0.002Ω
28
27
26
25
24
23
22
21
20
19
18
17
16
15
3
4
RUN/SS
NC
TG1
5V
1
2
+
SENSE1
SENSE1
EAIN
–
SW1
47pF
D3
MBRS
340T3
1000pF
4
5
6
7
0.47µF
BOOST1
M7
10k
10Ω
PLLFLTR
PLLIN
V
M9
IN
M8
0.01µF
1µF
× 3
BG1
1nF
100pF
150µF, 16V
× 2
470µF, 6.3V
PHASMD
EXTV
CC
1µF
6.3V
KEMET CAP
D9
8
22µF
6.3V
I
TH
INTV
CC
+
+
+
9
10
11
12
13
14
LTC1629
D10
GND
SGND
PGND
BG2
V
IN
12V
V
DIFFOUT
V
V
V
DIFFOUT
–
V
V
OS
–
D4
MBRS
340T3
BOOST2
SW2
M10
OS
+
0.47µF
OS
V
V
: 12V
IN
+
M12
M11
OS
: 1.05V TO 1.825, 70A
OUT
–
M1 TO M12: Si7440DP
L1 TO L4: 1µH SUMIDA CEP125-IROMC-H
D7 TO D10: CENTRAL CMDSH-3TR
SENSE2
SENSE2
TG2
1000pF
+
1
3
2
4
AMPMD
0.002Ω
C : KEMET T510X477M006AS
OUT
L4
10Ω
10Ω
1706-85 TA03
170685f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LTC1706-85
U
PACKAGE DESCRIPTIO
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.889 ± 0.127
(.035 ± .005)
0.497 ± 0.076
(.0196 ± .003)
REF
10 9
8
7 6
5.23
3.2 – 3.45
(.206)
3.00 ± 0.102
(.118 ± .004)
NOTE 4
4.88 ± 0.10
(.192 ± .004)
(.126 – .136)
MIN
DETAIL “A”
0.254
(.010)
0° – 6° TYP
GAUGE PLANE
0.50
(.0197)
BSC
3.05 ± 0.38
(.0120 ± .0015)
TYP
1
2
3
4 5
0.53 ± 0.01
(.021 ± .006)
RECOMMENDED SOLDER PAD LAYOUT
0.86
(.034)
REF
1.10
(.043)
MAX
DETAIL “A”
0.18
(.007)
SEATING
PLANE
NOTE:
0.17 – 0.27
(.007 – .011)
0.13 ± 0.05
(.005 ± .002)
MSOP (MS) 1001
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
0.50
(.0197)
TYP
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
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Dual High Efficiency, 2-Phase Sync Step-Down Controller
IN
LTC1628/LTC1628-PG
LTC1629/LTC1629-PG
LTC1702/LTC1703
Constant Freq, Standby, 5V and 3.3V LDOs, 3.5V ≤ V ≤ 36V
IN
Expandable Up to 12 Phases, Up to 200A, Remote Sense Diff Amp
550kHz, 25MHz GBW, No R
TM, 2.7V ≤ V ≤ 7V
SENSE
IN
LTC1706-81/LTC1706-82 VID Voltage Programmer with Desktop Code
VRM 8.2-VRM 8.4, V
Range: 1.3V to 3.5V
OUT
LTC1709/LTC1709-8
LT1709-85
2-Phase Sync Step-Down Controller with 5-Bit Desktop VID 4V ≤ V ≤ 36V, PLL, 36-Pin SSOP, Current Mode Operation
IN
2-Phase, 5-Bit VID, Current Mode High Efficiency
Synchronous Step-Down Switching Regulator
4V ≤ V ≤ 36V, 36-Pin SSOP VRM 8.5 Compatiable
IN
LTC1735
High Efficiency Sync Step-Down Controller
Burst Mode Operation, 16-Pin Narrow SSOP, Fault Protection,
3.5V ≤ V ≤ 36V
IN
LTC1736
LTC1772
LTC1773
High Efficiency Sync Buck Controller with 5-Bit Mobile VID GN-24, Power Good, Output Fault Protection, 3.5V ≤ V ≤ 36V
IN
SOT-23 Low Voltage Step-Down Controller
Synchronous Step-Down DC/DC Controller
6-Pin SOT-23, 2.5V ≤ V ≤ 10V, 550kHz, Burst Mode Operation
IN
Up to 95% Efficiency, 550kHz Operation, 2.65V ≤ V ≤ 8.5V,
IN
0.8 ≤ V
≤ V
IN
OUT
LTC1778
Wide Operating Range Step-Down Controller
2-Phase Sync Step-Down Controller
No R
, V up to 36V, Current Mode Power Good
SENSE IN
LTC1929/LTC1929-PG
LTC3728
Current Mode Operation, I
Up to 40A, 3.5V ≤ V ≤ 36V
OUT IN
550kHz, 2-Phase Dual Output Synchronous
Step-Down Controller
Synchronizable, Current Mode, 3.5V ≤ V ≤ 36V,
IN
I
up to 25A
OUT
LTC3729
550kHz, PolyPhase, High Efficiency Synchronous
Step-Down Switching Regulator
Current Mode, 4V ≤ V ≤ 36V, 28-Lead SSOP package
IN
Burst Mode and PolyPhase are registered trademarks of Linear Technology Corporation.
No R
is a trademark of Linear Technology Corporation.
SENSE
170685f
LT/TP 1202 2K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2001
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