Datasheet TK14588VTL Datasheet (TOKO)

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Page 1

TK14588

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)

■ High Speed Data Comparator (~2 Mbps)

■ Very Small Package (TSSOP-16)

DESCRIPTION

The TK14588V is a standard function general purpose IF IC capable of operating up to 22 MHz. The TK14588V contains a high-speed data comparator for base band processing. The TK14588V 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 TK14588V was developed for high-speed data communication, DECT, wireless LAN, keyless entry systems, etc.

APPLICATIONS

■ Communications Equipment

■ Wireless LAN

■ Keyless Entry Systems

TK14588V

IF INPUT

DECOUPLE

POWER SAVE

COMP OUTPUT

COMP GND

BLOCK DIAGRAM

GND RSSI IF OUTPUT DET INPUT DET OUTPUT AMP OUTPUT COMP INPUT COMP INPUT

The TK14588V is available in the very small TSSOP-16 surface mount package.

ORDERING INFORMATION

TK14588V

Tape/Reel Code

TAPE/REEL CODE

TL: Tape Left

GND

IF INPUT

DECOUPLE

DET OUTPUT

AMP OUTPUT

AMP

COMP

POWER SAVE

COMP INPUT

COMP OUTPUT

COMP INPUT

COMP GND

GND

RSSI

IF OUTPUT

DET INPUT

January 2000 TOKO, Inc. Page 1

Page 2

TK14588

ABSOLUTE MAXIMUM RATINGS

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

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

Power Dissipation (Note 1) ................................ 160 mW

TK14588V ELECTRICAL CHARACTERISTICS

Test conditions: V

LOBMYSRETEMARAPSNOITIDNOCTSETNIMPYTXAMSTINU

= 3 V, fIN = 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

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GniaG9657Bd

ISSR

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tupnidetaludom-nonmBd06-04.055.007.0V

ISSR

egatloVtuptuOISSR

tupnidetaludom-nonmBd03-50.102.104.1V

tupnidetaludom-nonmBd005.107.159.1V

ROTARAPMOC

TUO

Note 1: Power dissipation is 160 mW when mounted as recommended. Derate at 1.28 mW/°C for operation above 25°C.

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tnerruCtuptuO 1Am

Page 2 January 2000 TOKO, Inc.

Page 3

TEST CIRCUIT

(

)

TK14588

50 Ω

GND

0.01 µF

IF-INPUT

RSSI OUT

3.3 kΩ

12 kΩ

0.01 µF 0.01 µF

1 pF

836BH-0268 (TOKO)

1000 pF

51 kΩ

P.S.

0.01 µF

DET OUTPUT

AMP

COMP INPUT

4.7 µF

COMP

10 kΩ

3 kΩ

10 kΩ

COMP

OUT

0.01 µF

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25 °C, unless otherwise specified.

S+N, N, AM OUT, TOTAL

HARMONIC DISTORTION vs.

INPUT VOLTAGE

-20

-40

-60

S+N,N, AM OUT (dBV)

-80

THD

-100

S+N

AM OUT

(30% mod.)

THD

(V)

RSSI

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

January 2000 TOKO, Inc. Page 3

RSSI OUTPUT VOLTAGE vs.

INPUT VOLTAGE

2.0

1.6

1.2

0.8

0.4

0.0

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

5.5 V

3.0 V

2.3 V

Page 4

TK14588

(

)

(

) (

)

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25 °C, unless otherwise specified.

DETUNE CHARACTERISTICS

-10

-20

OUT

-30

(mVrms)

-40

OUT

-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

(dBV)

180

OUT

140

THD

100

2 3 4 5 6

VCC (V)

THD

(mA)

THD (dB), I

S CURVE

(V)

OUT(DC)

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

SUPPLY VOLTAGE, OUTPUT VOLTAGE,

TOTAL HARMONIC DISTORTION

vs. TEMPERATURE

300

260

220

(mVrms)

180

OUT

140

100

-40 -20 0 20 40 60 80 100

OUT

THD

TA (°C)

(mA)

THD (%), I

S/N (dB)

SIGNAL TO NOISE RATIO,

-3 dB LIMITING SENSITIVITY,

12 dB SINAD vs. TEMPERATURE

S/N

-3 dB LIMITING SENSITIVITY

12 dB SINAD

-40 -20 0 20 40 60 80 100 TA (°C)

-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.

TK14588

LIMITER GAIN vs.

INPUT FREQUENCY

100

GAIN (dB)

1 3 5 10 30 50

fIN (MHz)

Data Comparator Output Voltage Transient Response

(Rise)

OUT (1V/div)

RSSI OUTPUT VOLTAGE vs.

TEMPERATURE

2.0

1.8

1.6

(V)

RSSI

1.4

VIN = 0 dBm

VIN = -15 dBm

1.2

1.0

VIN = -30 dBm

-40 -20 0 20 40 60 80 100 TA (°C)

(Fall)

OUT

(1V/div)

IN (10 mV/div)

(10 mV/div)

50 ns/div 50 ns/div

RSSI OUTPUT VOLTAGE vs.

TEMPERATURE

1.0

VIN = -45 dBm

0.8

0.6

(V)

RSSI

0.4

VIN = -60 dBm

VIN = -75 dBm

0.2

0.0

VIN = -90 dBm

-40 -20 0 20 40 60 80 100 TA (°C)

(V)

RSSI

RSSI OUTPUT VOLTAGE vs.

INPUT VOLTAGE

2.0

1.6

1.2

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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TK14588

(

)

(

)

(

)

(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)

TK14588

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)

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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TK14588

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

POWER SAVE (1V/div)

RSSI OUTPUT

-10 dBm in

-40 dBm in

-70 dBm in (0.5V/div)

20 µs/div 20 µs/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

TK14588

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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TK14588

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

LANIMRET

NIP

.ON

LOBMYSEGATLOV

TK14588

TIUCRICTNELAVIUQELANRETNINOITPIRCSED

1 2 3

TUPNIFI

ELPUOCED ELPUOCED

V9.1 V9.1 V9.1

1.8 k

100 k

4CN .noitcennoclanretnioN

5EVASREWOPV

6V 7

TUOPMOC DNGPMOCV0

100 k

V0.3

reifilpmAgnitimiL:1

TUPNI

reifilpmAgnitimiL:3,2

gnilpuoceD

tsumnipsiht,revewoH

DNGotdetcennoceb

.noitcuderesionrof

:nOevaSrewoP

V3.0<

:ffOevaSrewoP

VotV5.1=

rotarapmoCataD:7

tuptuO

rotarapmoCataD:8

DNG

TUPNIPMOC TUPNIPMOC

tupnI

rotarapmoCataD:01,9

January 2000 TOKO, Inc. Page 11

Page 12

TK14588

1.2 V

PIN FUNCTION DESCRIPTION

LANIMRET

NIP

.ON

LOBMYSEGATLOV

TIUCRICTNELAVIUQELANRETNINOITPIRCSED

11 21

TUPTUOPMA

TUPTUOTED

V2.1 V2.1

31TUPNITEDV0.3tupnIrotceteD

41TUPTUOFIV9.1tuptuOretimiLFI

100 k

tuptuOreifilpmA:11

tuptuOrotceteD:21

51ISSR tuptuOISSR

61DNGV0

Page 12 January 2000 TOKO, Inc.

Page 13

CIRCUIT DESCRIPTION

TK14588

GND

IF INPUT

RSSI

DECOUPLE

IF OUTPUT

DECOUPLE

DET INPUT

DET OUTPUT

AMP

POWER SAVE

AMP OUTPUT

COMP INPUT

COMP

COMP OUTPUT

COMP INPUT

COMP GND

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 14 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 heavy, the negative half cycle of the output waveform may be distorted. This distortion can be reduced by connecting an external resistor between Pin 14 to GND to increase the operating current. The increased operating current by an external resistor is calculated as follows (see Figure 1B):

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

330

FIGURE 1A

1.8 K

100 kΩ

200 µA

IF OUTPUT

FIGURE 1B

January 2000 TOKO, Inc. Page 13

Page 14

TK14588

CIRCUIT DESCRIPTION (CONT.)

The RSSI output is a current output. It converts to a voltage by an external resistor between Pin 15 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 the component of amplitude modulation, but the RSSI output response is slower. Determine the external resistance and capacitance by the application.

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 VCC - 0.2 V (the supply voltage minus the collector saturation voltage of the output transistor).

OUTPUT CURRENT

RSSI- OUT

Current-to-Voltage

Transformation Resistor

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 is 0 to 200 ppm/ °C.

This product is very accurate, because the RSSI characteristic is trimmed individually.

AM Demodulation by Using the RSSI Output:

Although the distortion of the RSSI output is high because it is a logarithmic detection of the envelope to the IF input, 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 application for some uses because it does not have the response time problem.

Figure 3A shows the AM demodulated waveform.

RSSI-OUT (V)

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

AM can be

demodulated

inside of linear

range

100mV/div 100µs/div

RF INPUT - LEVEL (dBu)

FIGURE 3A - AM DEMODULATED WAVEFORM

FIGURE 3B

Page 14 January 2000 TOKO, Inc.

Page 15

TK14588

multiplier core circuit

CIRCUIT DESCRIPTION (CONT.)

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 14 (IF limiter output) and Pin 13 (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.

FIGURE 4

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 14 and Pin 13, note that the bias voltage to Pin 13 should be provided from an external source because Pin 13 is only connected to the base of QA.

Because the base of QB (at the opposite side) is connected with the supply voltage, Pin 13 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 13 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 13 should be higher than 100 mV

P-P

The following figures show examples of the phase shifter.

Rz is the characteristic impedance

Delay

Line

LC resonance circuit ceramic discriminator delay line

FIGURE 5 - EXAMPLES OF PHASE SHIFTER

January 2000 TOKO, Inc. Page 15

Page 16

TK14588

(Hz)

CIRCUIT DESCRIPTION (CONT.)

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 the 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 11 and Pin 12 (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.

Demodulated

Output Current

FIGURE 6 - INTERNAL EQUIVALENT CIRCUIT OF DETECTOR OUTPUT STAGE

ref

I to V convertor

Demodulated

Output Voltage

OUT

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

Fc =

2 π C0R

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

ref

0 dB = 35.2 mVrms

-2

-4

(dB)

-6

OUT

-8

C = 1000 pF

-10

-12 1 3 10 30 100 300 1000

MODULATING FREQUENCY fm

C = 330 pF

C = ∞

10 pF

C =

47 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.

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 12 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.

Page 16 January 2000 TOKO, Inc.

Page 17

CIRCUIT DESCRIPTION (CONT.)

ref

Demodulated

Output Current

FIGURE 8 - EXAMPLE OF USING EXTERNAL REFERENCE SOURCE

I to V convertor

Demodulated

Output Voltage

OUT

TK14588

Demodulated Output Voltage V Demodulated Bandwidth

1/gm is about 50 kΩ that is the output resistance of the multiplier.

Pin 11 is disconnected.

= VB ± R1 x io

OUT

Fc =

2 π C1(1/gm)

Demodulated Output Voltage V

Demodulated

Output Voltage

OUT

Demodulated Bandwidth

1/gm is about 50 kΩ that is the output resistance of the

= VCC/2 ± R1 x io

OUT

Fc =

2 π C1(1/gm)

multiplier.

R1 = R2

Pin 11 is disconnected.

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

Comparator:

The TK14588V contains a general purpose high-speed data comparator for the base band processing. Because the input stage is composed of PNP transistors, it is possible to operate from a minimum voltage of 0.2 V to the supply voltage minus

0.9 V (see Figure 10). Moreover, as the HFE of this PNP transistor is over 100, the bias current is below 0.01 µA (this is below 10% of the value

of the general products on the market using lateral PNP transistor at input stage).

INPUT STAGE

FIGURE 10 - COMPARATOR INPUT STAGE

January 2000 TOKO, Inc. Page 17

Page 18

TK14588

CIRCUIT DESCRIPTION (CONT.)

Comparator (cont.):

Figure 11 shows the internal equivalent circuit of the comparator output stage. Because the comparator output is an open collector, it is suitable for many interface levels. This open collector output is connected with an electrostatic discharge protection diode at the GND side only; it is not connected with it at the power supply side in consideration of operating the voltage over the supply voltage of this IC.

When the collector pull-up resistor value is low, high operating currents result. To prevent interference to the other circuitry, the emitter of the output transistor is brought out independently at Pin 8.

Pin 8 is not connected with the substrate and other GND internal to the IC. Therefore, when operating this comparator, this terminal must be connected to GND.

When the comparator is operating at high speed, the etch pattern of Pins 7 and 8 (comparator output stage) should not be run close to the etch pattern of Pin 1 (IF input). The switching waveform of the comparator output may have an effect on the IF input and may add noise to the zero crossing of the demodulated waveform, resulting in cross over distortion.

COMPARATOR

OUTPUT STAGE

1 mA

FIGURE 11 - COMPARATOR OUTPUT STAGE

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 12 shows the internal equivalent circuit of Pin 5.

Because it switches the bias circuit of the whole IC 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 12

Page 18 January 2000 TOKO, Inc.

Page 19

TEST BOARD

TK14588

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

TK14588

PACKAGE OUTLINE

TSSOP-16

Lot. No.

AAAAA

YYY

+0.15

-0.15

0.25

0.12

Marking Information

TK14588V 14588

0.35

1.0

Marking

4.8

4.4

5.0

0.9

1.2 max

0.65

0 ~ 0.15

0.1

0.65

Recommended Mount Pad

0 ~ 10

0.50

0.3

6.4

+0.15

-0.15

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.

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