Datasheet TK14584MTL Datasheet (TOKO)

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Page 1

TK14584

GND

RSSI

IF OUTPUT

DET INPUT

DET OUTPUT

AMP OUTPUT

IF INPUT

DECOUPLE

POWER SAVE

GND

AMP

FM IF IC

FEATURES

■ Input Frequency (~22 MHz)

■ Low Voltage Operation (2.3 to 5.5 V)

■ Battery Save Function

■ Wide Band Demodulator (~1 MHz)

■ Very Small Package (SSOP-12)

DESCRIPTION

The TK14584M is a standard function general purpose IF IC capable of operating up to 22 MHz. The TK14584M has a unique function that allows establishing the demodulation characteristics by changing the external RC time constant, and not changing the phase shifter constant. The RSSI output is individually trimmed, resulting in excellent accuracy, good linearity, and stable temperature characteristics. The TK14584M was developed for highspeed data communication, DECT, wireless LAN, keyless entry systems, etc.

APPLICATIONS

■ Communications Equipment

■ Wireless LAN

■ Keyless Entry Systems

TK14584M

IF INPUT

DECOUPLE

POWER SAVE

BLOCK DIAGRAM

GND RSSI

11 10

IF OUTPUT DET INPUT

9 8

DET OUTPUT AMP OUTPUT

The TK14584M is available in the very small SSOP-12 surface mount package.

ORDERING INFORMATION

TK14584M

January 2000 TOKO, Inc. Page 1

Tape/Reel Code

TAPE/REEL CODE

TL: Tape Left

Page 2

TK14584

ABSOLUTE MAXIMUM RATINGS

Supply Voltage ........................................................... 6 V

Operating Voltage Range.............................. 2.3 to 5.5 V

Power Dissipation (Note 1) ................................ 250 mW

TK14584M ELECTRICAL CHARACTERISTICS

Test conditions: V

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= 3 V, f

= 10.7 MHz, fm = 1 kHz, Modulation = ±50 kHz, T

Storage Temperature Range ................... -55 to +150 °C

Operating Temperature Range ...................-30 to +85 °C

Operating Frequency Range (IF) ................. 6 to 22 MHz

Operating Frequecy Range (Demodulation) ..... to 1 MHz

= 25 °C, unless otherwise specified.

tnerruCylppuS

tupnioN,NO=evaSrewoP2.00.5Aµ

tupnioN5.30.5Am

TUO

egatloVtuptuOtupnimBd03-021002063smrVm

DHTnoitrotsiDcinomraHlatoTtupnimBd03-5.00.2%

N/SoitaResioNotlangiStupnimBd03-0607Bd

DANISDANISBd21 98-38-mBd

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ecnatsiseRtupnIretimiL 4.18.12.2kΩ

GniaG9657Bd

ISSR

tupnioN00.002.003.0V

tupnidetaludom-nonmBd06-04.055.007.0V

ISSR

egatloVtuptuOISSR

tupnidetaludom-nonmBd03-50.102.104.1V

tupnidetaludom-nonmBd005.107.159.1V

Note 1: Power dissipation is 250 mW when mounted as recommended. Derate at 2.0 mW/°C for operation above 25°C.

Page 2 January 2000 TOKO, Inc.

Page 3

0.01 µF

TEST CIRCUIT

12 kΩ

RSSI OUT

3.3 kΩ

836BH-0268 (TOKO)

1000 pF

TK14584

DET OUTPUT

50 Ω

GND

0.01 µF

IF-INPUT

1 pF

0.01 µF 0.01 µF

51 kΩ

AMP

P.S.

4.7 µF 0.01 µF

January 2000 TOKO, Inc. Page 3

Page 4

TK14584

(

)

(

)

(

)

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25 °C, unless otherwise specified.

S+N, N, AM OUT, TOTAL

HARMONIC DISTORTION vs.

INPUT VOLTAGE

S+N

-20

-40

AM OUT

(30% mod.)

-60

S+N,N, AM OUT (dBV)

-80

THD

-100

-120 -100 -80 -60 -40 -20 0 20 VIN (dBm)

DETUNE CHARACTERISTICS

-10

-20

OUT

-30

(dBV)

-40

OUT

THD

RSSI OUTPUT VOLTAGE vs.

INPUT VOLTAGE

2.0

1.6

1.2

(V)

RSSI

0.8

0.4

0.0

-120 -100 -80 -60 -40 -20 0 20 VIN (dBm)

S CURVE

(V)

OUT(DC)

5.5 V

3.0 V

2.3 V

-50

-60

10.3 10.5 10.7 10.9 11.1

THD

fIN (MHz)

SUPPLY CURRENT, OUTPUT VOLTAGE,

TOTAL HARMONIC DISTORTION vs.

SUPPLY VOLTAGE

300

260

220

(mVrms)

180

OUT

140

100

2 3 4 5 6

OUT

THD

VCC (V)

(mA)

THD (dB), I

10.3 10.5 10.7 10.9 11.1 fIN (MHz)

SIGNAL TO NOISE RATIO,

-3 dB LIMITING SENSITIVITY,

12 dB SINAD vs. SUPPLY VOLTAGE

S/N

-3 dB LIMITING SENSITIVITY

S/N (dB)

2 3 4 5 6

12 dB SINAD

VCC (V)

-50

-60

-70

dBm

-80

-90

12 dB SINAD

-3 dB LIMITING SENSITIVITY,

-100

Page 4 January 2000 TOKO, Inc.

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

(

)

TA = 25 °C, unless otherwise specified.

TK14584

SUPPLY CURRENT, OUTPUT VOLTAGE,

TOTAL HARMONIC DISTORTION

vs. TEMPERATURE

300

260

220

(mVrms)

180

OUT

140

THD

100

-40 -20 0 20 40 60 80 100 TA (°C)

LIMITER GAIN vs.

INPUT FREQUENCY

100

(mA)

THD (%), I

SIGNAL TO NOISE RATIO,

-3 dB LIMITING SENSITIVITY,

12 dB SINAD vs. TEMPERATURE

S/N

-3 dB LIMITING SENSITIVITY

S/N (dB)

12 dB SINAD

-40 -20 0 20 40 60 80 100 TA (°C)

RSSI OUTPUT VOLTAGE vs.

TEMPERATURE

2.0

1.8

VIN = 0 dBm

(V)

1.6

-50

-60

-70

dBm

-80

-90

12 dB SINAD

-3 dB LIMITING SENSITIVITY,

-100

GAIN (dB)

1 3 5 10 30 50

fIN (MHz)

RSSI OUTPUT VOLTAGE vs.

TEMPERATURE

1.0

VIN = -45 dBm

0.8

0.6

(V)

RSSI

0.4

0.2

0.0

-40 -20 0 20 40 60 80 100

VIN = -60 dBm

VIN = -75 dBm

VIN = -90 dBm

TA (°C)

RSSI

1.4

VIN = -15 dBm

1.2

1.0

VIN = -30 dBm

-40 -20 0 20 40 60 80 100 TA (°C)

RSSI OUTPUT VOLTAGE vs.

INPUT VOLTAGE

2.0

1.6

1.2

(V)

RSSI

TEMP (deg)

-30

0.8

0.4

0.0

-120 -100 -80 -60 -40 -20 0 20

0 25 50 70 85

VIN (dBm)

January 2000 TOKO, Inc. Page 5

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TK14584

(

)

(

)

(

)

(V)

OUT(DC)

9.9 10.3 10.7 11.1 11.5

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, unless otherwise specified.

S CURVE

836BH-0268 (TOKO)

RD = 3.3 k

fIN (MHz)

1 pF

RD = 1.0 k

RD = 2.0 k

51 kΩ

DET OUTPUT

OUTPUT VOLTAGE vs.

MODULATING FREQUENCY

0 dB = 208 mVrms

RD = 3.3 kΩ

(dB)

OUT

-2

-4

C = 1000 pF

-6

C = 330 pF

-8

-10

-12 1 3 10 30 100 300 1000

C = 47 pF

MODULATING FREQUENCY fm

OUTPUT VOLTAGE vs.

MODULATING FREQUENCY

0 dB = 35.2 mVrms

RD = 1.0 kΩ

(dB)

OUT

-2

-4

C = 1000 pF

-6

C = 330 pF

-8

C = ∞

C = 10 pF

C = ∞

C = 10 pF

kHz

OUTPUT VOLTAGE vs.

MODULATING FREQUENCY

0 dB = 107 mVrms

RD = 2.0 kΩ

(dB)

OUT

-2

-4

C = 1000 pF

-6

C = 330 pF

-8

-10

-12 1 3 10 30 100 300 1000

C = 47 pF

MODULATING FREQUENCY fm

C = ∞

C = 10 pF

kHz

-10

-12 1 3 10 30 100 300 1000

MODULATING FREQUENCY fm

C = 47 pF

kHz

Page 6 January 2000 TOKO, Inc.

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, unless otherwise specified.

RSSI Output Voltage Transient Response (IF Input ON/OFF)

IF INPUT VOLTAGE

= -10, -40, -70 dBm

C = 0.01 µF

12 k

RSSI OUTPUT

-10 dBm in

-40 dBm in

-70 dBm in (0.5V/div)

GATE PULSE

(1V/div)

TK14584

C = 0.001 µF

C = 0.0001 µF

0.1 ms/div

RSSI OUTPUT

-10 dBm in

-40 dBm in

-70 dBm in (0.5V/div)

SG GATE PULSE

(1V/div)

20 µs/div 20 µs/div

RSSI OUTPUT

-10 dBm in

-40 dBm in

-70 dBm in (0.5V/div)

GATE PULSE

(1V/div)

0.1 ms/div

20 µs/div

January 2000 TOKO, Inc. Page 7

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TK14584

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, unless otherwise specified.

RSSI Output Voltage Transient Response (Power Save ON/OFF)

IF INPUT VOLTAGE

= -10, -40, -70 dBm

12 k

RSSI OUTPUT

C = 0.01 µF

C = 0.001 µF

POWER SAVE (1V/div)

RSSI OUTPUT

-10 dBm in

-40 dBm in

-70 dBm in (0.5V/div)

0.2 ms/div

POWER SAVE (1V/div)

RSSI OUTPUT

-10 dBm in

-40 dBm in

-70 dBm in (0.5V/div)

20 µs/div 20 µs/div

0.2 ms/div

C = 0.0001 µF

20 µs/div 20 µs/div

POWER SAVE (1V/div)

RSSI OUTPUT

-10 dBm in

-40 dBm in

-70 dBm in (0.5V/div)

Page 8 January 2000 TOKO, Inc.

Page 9

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, unless otherwise specified.

RSSI Output Voltage Transient Response (Supply Voltage ON)

IF INPUT VOLTAGE

= -10, -40, -70 dBm

12 k

RSSI OUTPUT

TK14584

C = 0.01 µF

C = 0.001 µF

0.5 ms/div

(1V/div)

RSSI OUTPUT

-10 dBm in

-40 dBm in

-70 dBm in (0.5V/div)

(1V/div)

RSSI OUTPUT

-10 dBm in

-40 dBm in

-70 dBm in

(0.5V/div)

C = 0.0001 µF

(1V/div)

RSSI OUTPUT

-10 dBm in

-40 dBm in

-70 dBm in (0.5V/div)

0.5 ms/div

January 2000 TOKO, Inc. Page 9

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TK14584

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)

TA = 25 °C, unless otherwise specified.

Detector Output Voltage Transient Response (Power Save ON/OFF,Supply Voltage ON)

IF INPUT VOLTAGE

= -40 dBm, No input

POWER SAVE ON/OFF

POWER SAVE (1V/div)

DET OUTPUT

SUPPLY VOLTAGE ON

2 ms/div

-40 dBm in, No input

(0.5V/div)

(1V/div)

DET OUTPUT

-40 dBm in, No input

(0.5V/div)

2 ms/div

Page 10 January 2000 TOKO, Inc.

Page 11

PIN FUNCTION DESCRIPTION

1.2 V

LANIMRET

NIP

.ON

LOBMYSEGATLOV

TK14584

TIUCRICTNELAVIUQELANRETNINOITPIRCSED

1 2 3

TUPNIFI

ELPUOCED ELPUOCED

V9.1 V9.1 V9.1

1.8 k

100 k

4CN .noitcennoclanretnioN

5EVASREWOPV

6V 7

TUPTUOPMA

TUPTUOTED

100 k

V0.3 V2.1

V2.1

TUPNIpmAgnitimiL:1

pmAgnitimiL:3,2

gnilpuoceD

tsumnipsiht,revewoH

DNGotdetcennoceb

.noitcuderesionrof

:nOevaSrewoP

V3.0<

:ffOevaSrewoP

VotV5.1=

tuptuOreifilpmA:7 tuptuOrotceteD:8

9TUPNITEDV0.3tupnIrotceteD

January 2000 TOKO, Inc. Page 11

Page 12

TK14584

PIN FUNCTION DESCRIPTION

LANIMRET

NIP

.ON

LOBMYSEGATLOV

TIUCRICTNELAVIUQELANRETNINOITPIRCSED

01TUPTUOFIV9.1tuptuOretimiLFI

100 k

11ISSR tuptuOISSR

21DNGV0

Page 12 January 2000 TOKO, Inc.

Page 13

GND

RSSI

IF OUTPUT

DET INPUT

DET OUTPUT

AMP OUTPUT

IF INPUT

DECOUPLE

POWER SAVE

GND

AMP

CIRCUIT DESCRIPTION

TK14584

IF Limiter Amplifier, RSSI:

The IF limiter amplifier is composed of five differential gain stages. The total gain of the IF limiter amplifier is 80 dB. The output signal of the IF limiter amplifier is provided at Pin 10 through the emitter-follower output stage. The IF limiter amplifier output level is 0.5 V

P-P

The input resistance of the IF limiter amplifier is 1.8 kΩ (see Figure 1A). If the impedance of the filter is lower than 1.8 kΩ, connect an external resistor between Pin 1 and Pin 2 in parallel to provide the equivalent load impedance of the filter. Figure 1A shows the case that the impedance of the filter is 330 Ω.

The operating current of the emitter-follower of the IF limiter amplifier output is 200 µA. If the capacitive load is large, the negative half cycle of the output waveform may be distorted. This distortion can be reduced by connecting an external resistor between Pin 10 to GND to increase the operating current. The increased operating current from an external resistor is calculated as follows (see Figure 1B):

The increased operating current Ie (mA) = (VCC - 1.0) / Re (kΩ)

1.8 K

100 kΩ

200 µA

IF OUTPUT

330

FIGURE 1A

January 2000 TOKO, Inc. Page 13

FIGURE 1B

Page 14

TK14584

CIRCUIT DESCRIPTION (CONT.)

The RSSI output is a current output. It converts to a voltage by an external resistor between Pin 11 and GND. The time constant of the RSSI output is determined by the product of the external converting resistance and parallel capacitance. When the time constant is longer, the RSSI output is less likely to be influenced by a disturbance or component of amplitude modulation, but the RSSI output response is slower. The external resistance and capacitance are determined by the application.

OUTPUT

CURRENT

RSSI- OUT

Current-to-Voltage

Transformation Resistor

FIGURE 2 - RSSI OUTPUT STAGE

The slope of the RSSI curve characteristic can be modified by changing the external resistance. In this case, the maximum range of converted RSSI output voltage is GND level to about V

- 0.2 V (the supply voltage minus the collector saturation

voltage of the output transistor).

In addition, the temperature characteristic of the RSSI output voltage can be modified by changing the temperature characteristic of the external resistor. Normally, the temperature characteristic of the RSSI output voltage is very stable when using a carbon resistor or metal film resistor with a temperature characteristic of 0 to 200 ppm/ °C.

The RSSI output is trimmed individually for enhanced accuracy.

AM Demodulation by Using the RSSI Output:

Although the distortion of the RSSI output is high because it is a logarithmic detection of the IF input envelope, AM can be demodulated simply by using the RSSI output. In this case, the input dynamic range that can demodulate AM is the inside of the linear portion of the RSSI curve characteristic (see Figure 3B).

This method does not have a feedback loop to control the gain because an AGC amplifier is not necessary (unlike the popularly used AM demodulation method). Therefore, it is a very useful for some applications because it does not have the response time problem.

Figure 3A shows the AM demodulated waveform.

Page 14 January 2000 TOKO, Inc.

Page 15

CIRCUIT DESCRIPTION (CONT.)

Operating Condition VCC = 3 V, fIN = 10.7 MHz, fm = 40 kHz, Mod = 80%, VIN = -40 dBm

100mV/div 10µs/div

TK14584

RSSI-OUT (V)

AM can be

demodulated

inside of linear

range

RF INPUT - LEVEL (dBu)

FIGURE 3A - AM DEMODULATED WAVEFORM

FIGURE 3B

FM Detector:

The FM detector is included in the quadrature FM detector using a Gilbert multiplier. It is suitable for high speed data communication because the demodulation bandwidth is over 1 MHz. The phase shifter is connected between Pin 10 (IF limiter output) and Pin 9 (input detector). Any available phase shifter

can be used: a LC resonance circuit, a ceramic discriminator, a delay line, etc. Figure 4 shows the internal equivalent circuit of the detector.

multiplier core circuit

FIGURE 4

January 2000 TOKO, Inc. Page 15

Page 16

TK14584

CIRCUIT DESCRIPTION (CONT.)

The signal from the phase shifter is applied to the multiplier (in the dotted line) through emitter-follower stage QA. When the phase shifter is connected between Pin 10 and Pin 9, note that the bias voltage to Pin 9 should be provided from an external source because Pin 9 is only connected to the base of QA.

Because the base of QB (at the opposite side) is connected with the supply voltage, Pin 9 has to be biased with the equivalent voltage.

Using an LC resonance circuit is not a problem (see Figure 5). However, when using a ceramic discriminator, it is necessary to pay attention to bias. If there is a difference of the base voltages, the DC voltages of the multiplier do not balance. It alters the DC zero point or worsens the distortion of demodulation output.

The Pin 9 input level should be saturated at the multiplier; if this level is lower, it is easy to disperse the modulation output. Therefore, to have stable operation, Pin 9 should be higher than 100 mV

The following figures show examples of the phase shifter.

P-P

Rz is the characteristic impedance

LC resonance circuit ceramic discriminator delay line

Delay

Line

FIGURE 5 - EXAMPLES OF PHASE SHIFTERS

Establishing Demodulation Characteristics:

Generally, demodulation characteristics of FM detectors are determined by the external phase shifter. However, this product has a unique function which can optionally establish the demodulation characteristics by the time constant of the circuit parts after demodulation. The following explains this concept.

Figure 6 shows the internal equivalent circuit of the detector output stage. The multiplier output current of the detector is converted to a voltage by the internal OP AMP. The characteristic of this

stage is determined by converting the current to voltage with resistor RO and the capacitor CO connected between Pin 7 and Pin 8 (see Figure 6).

In other words, the slope of the S-curve characteristic can be established optionally with resistor RO without changing the constant of the phase shifter. The demodulated bandwidth can be established optionally by the time constant of this external resistor RO and capacitor CO inside of a bandwidth of the IF-filter and phase shifter. Figure 7 shows an example of this characteristic.

Page 16 January 2000 TOKO, Inc.

Page 17

CIRCUIT DESCRIPTION (CONT.)

(Hz)

TK14584

The -3 dB frequency Fc is calculated by the following:

2 π C

0R0

Fc =

The S-curve output voltage is calculated by the following

as centering around the internal reference voltage V

= V

± io X R

ref

Where V

= 1.4 V, maximum of current io = ±100 µA

ref

OUT

Demodulated

Output Current

ref

I to V convertor

Demodulated

Output Voltage

OUT

FIGURE 6 - INTERNAL EQUIVALENT CIRCUIT OF DETECTOR OUTPUT STAGE

(dB)

OUT

0 dB = 35.2 mVrms

-2

-4

-6

-8

C = 330 pF

C = ∞

10 pF

C =

Operating Condition:

Measured by the standard test circuit. Parallel resistor to phase shift coil = 1 kΩ. fIN = 10.7 MHz, modulation = ±100 kHz. External capacitance CO = 0~1000 pF.

ref

C = 1000 pF

-10

-12 1 3 10 30 100 300 1000

MODULATING FREQUENCY fm

C =

47 pF

FIGURE 7 - EXAMPLE: BANDWIDTH OF DEMODULATION VS. TIME CONSTANT CHARACTERISTIC

Center Voltage of Detector DC Output:

The center voltage of the detector DC output is determined by the internal reference voltage source. It is impossible to change this internal reference voltage source, but it is possible to change the center voltage by the following method.

As illustrated in Figure 8, the demodulated output current at Pin 8 is converted to the voltage by an external resistor R1 without using the internal OP AMP.

Figure 9 shows an example of a simple circuit that divides the supply voltage into halves using resistors. Since both circuits have a high output impedance, an external buffer amplifier should be connected.

January 2000 TOKO, Inc. Page 17

Page 18

TK14584

CIRCUIT DESCRIPTION (CONT.)

ref

I to V convertor

Demodulated Output Voltage V

= VB ± R1 x io

OUT

Demodulated

Output Current

Fc =

2 π C1(1/gm)

1/gm is approximately 50 kΩ which is the output

Demodulated Bandwidth

Demodulated

Output Voltage

OUT

resistance of the multiplier. Pin 7 is disconnected.

FIGURE 8 - EXAMPLE OF USING EXTERNAL REFERENCE SOURCE

Demodulated Output Voltage V

Demodulated

Output Voltage

OUT

Demodulated Bandwidth

1/gm is approximately 50 kΩ which is the output

= VCC/2 ± R1 x io

OUT

Fc =

2 π C1(1/gm)

resistance of the multiplier.

R1 = R2

Pin 7 is disconnected.

FIGURE 9 - EXAMPLE OF DIVIDING SUPPLY VOLTAGE INTO HALVES BY THE RESISTORS

Power Save Function:

Pin 5 is the control terminal for the battery save function. The ON/OFF operation of the whole IC can be switched by controlling the DC voltage at this terminal. Figure 10 shows the internal equivalent circuit of Pin 5.

Because it switches the bias circuit of the entire IC by using the transistor in standby mode, it reduces the supply current to near zero. As the input terminal is connected with an electrostatic discharge protection diode at GND side only, it is possible to control the voltage above the supply voltage. It is possible to go into standby mode by disconnecting Pin 5, but it is not recommended because Pin 5 is a high impedance and may malfunction by an external disturbance.

When Pin 5 is disconnected, a suitable capacitor should be connected between Pin 5 and GND.

BIAS

50 K

FIGURE 10

Page 18 January 2000 TOKO, Inc.

Page 19

TEST BOARD

TK14584

C1 = C2 = C4 = C6 = C8 = C9 = C10 = 0.01 µF C3 = 4.7 µF, C5 = 1000 pF, C7 = 1 pF R1 = 51 Ω, R2 = 51 kΩ, R3 = 3.3 kΩ, R4 = 12 kΩ, R5 = 3 kΩ L1 = L2 = 10 µH L3 = 836BH-0268 (TOKO)

January 2000 TOKO, Inc. Page 19

Page 20

TK14584

(

)

PACKAGE OUTLINE

SSOP-12

Lot. No.

AAA

YYY

+0.15

-0.05

0.3

5.0

0.10

Marking Information

TK14584M 584

0.4

1.2

Marking

5.4 e1

4.4

1.4

1.7 max

0 ~ 0.2

0.8

0.1

0.8

Recommended Mount Pad

0 ~ 10

0.5

0.3

6.0

+0.15

-0.05

0.15

Dimensions are shown in millimeters Tolerance: x.x = ± 0.2 mm

unless otherwise specified

Toko America, Inc. Headquarters 1250 Feehanville Drive, Mount Prospect, Illinois 60056 Tel: (847) 297-0070 Fax: (847) 699-7864

TOKO AMERICA REGIONAL OFFICES

Midwest Regional Office Toko America, Inc. 1250 Feehanville Drive Mount Prospect, IL 60056 Tel: (847) 297-0070 Fax: (847) 699-7864

Western Regional Office Toko America, Inc. 2480 North First Street , Suite 260 San Jose, CA 95131 Tel: (408) 432-8281 Fax: (408) 943-9790

Eastern Regional Office Toko America, Inc. 107 Mill Plain Road Danbury, CT 06811 Tel: (203) 748-6871 Fax: (203) 797-1223

Semiconductor Technical Support Toko Design Center 4755 Forge Road Colorado Springs, CO 80907 Tel: (719) 528-2200 Fax: (719) 528-2375

Visit our Internet site at http://www.tokoam.com

The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc.

Page 20 January 2000 TOKO, Inc.

IC-119-TK119xx

0798O0.0K