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TK14588
FM IF IC FEATURES
s s s s s s 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)
APPLICATIONS
s Communications Equipment s Wireless LAN s Keyless Entry Systems
TK14588V
IF INPUT GND RSSI IF OUTPUT DET INPUT DET OUTPUT AMP OUTPUT COMP INPUT COMP INPUT
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. The TK14588V is available in the very small TSSOP-16 surface mount package.
RSSI GND
DECOUPLE DECOUPLE NC POWER SAVE VCC COMP OUTPUT COMP GND
BLOCK DIAGRAM
AMP OUTPUT
DET OUTPUT
GND
AMP
COMP INPUT
+
COMP
ORDERING INFORMATION
POWER SAVE DECOUPLE DECOUPLE NC
VCC
COMP OUTPUT COMP GND IF INPUT VCC
TK14588V
Tape/Reel Code
TAPE/REEL CODE
TL: Tape Left
January 2000 TOKO, Inc.
-
Page 1
COMP INPUT
DET INPUT
IF OUTPUT
+
-
TK14588
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ........................................................... 6 V Operating Voltage Range .............................. 2.3 to 5.5 V Power Dissipation (Note 1) ................................ 160 mW 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
TK14588V ELECTRICAL CHARACTERISTICS
Test conditions: VCC = 3 V, fIN = 10.7 MHz, fm = 1 kHz, Modulation = 50 kHz, TA = 25 C, unless otherwise specified. SYMBOL ICC IF VOUT T HD S/N SINAD RIF(IN) G RSSI No input -60 dBm non-modulated input VRSSI RSSI Output Voltage -30 dBm non-modulated input 0 dBm non-modulated input COMPARATOR DR IOUT Duty Ratio Output Current 45 50 1 55 % mA 1.05 1.50 1.20 1.70 1.40 1.95 V V 0.00 0.40 0.20 0.55 0.30 0.70 V V Output Voltage Total Harmonic Distortion Signal to Noise Ratio 12 dB SINAD Limiter Input Resistance Gain 1.4 69 -30 dBm input -30 dBm input -30 dBm input 60 120 200 0.5 70 -89 1.8 75 -83 2.2 360 2.0 mVrms % dB dBm k dB PARAMETER Supply Current Power Save = ON, No input 0.2 5.0 A TEST CONDITIONS No input MIN TYP 3.5 MAX 5.0 UNITS mA
Note 1: Power dissipation is 160 mW when mounted as recommended. Derate at 1.28 mW/C for operation above 25C.
Page 2
January 2000 TOKO, Inc.
TK14588
TEST CIRCUIT
VCC RSSI OUT 3.3 k 0.01 F 12 k 836BH-0268 (TOKO) DET OUTPUT 1000 pF 10 k 10 k 0.01 F COMP INPUT
1 pF GND
51 k
+
COMP VCC
VCC
0.01 F P.S. 50
+
0.01 F 4.7 F COMP VCC
~
0.01 F IF-INPUT
0.01 F
3 k
COMP OUT
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 C, unless otherwise specified.
S+N, N, AM OUT, TOTAL HARMONIC DISTORTION vs. INPUT VOLTAGE
S+N
RSSI OUTPUT VOLTAGE vs. INPUT VOLTAGE 20 16 THD (%) 12 8
VRSSI (V)
0 S+N,N, AM OUT (dBV) -20 -40 -60 -80
2.0 1.6 1.2 0.8 0.4 0.0 -120 -100 -80
-
AM OUT (30% mod.)
THD N
4 0 -60 -40 -20 VIN (dBm) 0 20
-100 -120 -100 -80
January 2000 TOKO, Inc.
+
AMP
VCC 5.5 V 3.0 V 2.3 V
-60 -40 -20 VIN (dBm)
0
20
Page 3
TK14588
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25 C, unless otherwise specified.
DETUNE CHARACTERISTICS -10 -20 20 16
VOUT(DC) (V)
S CURVE 3
VOUT
VOUT (mVrms)
-40 -50 -60 10.3
8 4 0 11.1
THD (%)
-30
12
2
1
THD
10.5
10.7 fIN (MHz)
10.9
0 10.3
10.5
10.7 fIN (MHz)
10.9
11.1
SUPPLY CURRENT, OUTPUT VOLTAGE, TOTAL HARMONIC DISTORTION vs. SUPPLY VOLTAGE 5 300 260
VOUT (dBV)
ICC
SIGNAL TO NOISE RATIO, -3 dB LIMITING SENSITIVITY, 12 dB SINAD vs. SUPPLY VOLTAGE -50 80 70
S/N
THD (dB), ICC (mA)
4 3
-60 -70
S/N (dB)
220
VOUT
60
-3 dB LIMITING SENSITIVITY
180 140
THD
2 1 0 2 3 4 VCC (V) 5 6
50 40 30 2 3 4 VCC (V) 5
-80 -90 -100 6
12 dB SINAD
100
SUPPLY VOLTAGE, OUTPUT VOLTAGE, TOTAL HARMONIC DISTORTION vs. TEMPERATURE 5 300 260
VOUT (mVrms)
ICC
SIGNAL TO NOISE RATIO, -3 dB LIMITING SENSITIVITY, 12 dB SINAD vs. TEMPERATURE 80 70
S/N (dB)
S/N
-50 -60 -70
-3 dB LIMITING SENSITIVITY
4 3
VOUT
220 180 140
THD
60 50
12 dB SINAD
2 1 0 100
-80 -90 -100 100
40 30 -40
100 -40
-20
0
20
40
60
80
-20
0
20
40
60
80
TA (C)
TA (C)
Page 4
January 2000 TOKO, Inc.
-3 dB LIMITING SENSITIVITY, 12 dB SINAD (dBm)
THD (%), ICC (mA)
-3 dB LIMITING SENSITIVITY, 12 dB SINAD (dBm)
TK14588
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 C, unless otherwise specified.
LIMITER GAIN vs. INPUT FREQUENCY 100 80 GAIN (dB) VRSSI (V) 60 40 20 0 1 3 5 10 30 50 fIN (MHz)
RSSI OUTPUT VOLTAGE vs. TEMPERATURE 2.0 1.8 1.6 1.4 1.2 1.0 -40
VIN = -30 dBm VIN = 0 dBm
VIN = -15 dBm
-20
0
20
40
60
80
100
TA (C)
Data Comparator Output Voltage Transient Response
(Rise) (Fall)
OUT (1V/div)
OUT (1V/div)
IN (10 mV/div)
IN (10 mV/div)
50 ns/div
50 ns/div
RSSI OUTPUT VOLTAGE vs. TEMPERATURE 1.0
VIN = -45 dBm
RSSI OUTPUT VOLTAGE vs. INPUT VOLTAGE 2.0 1.6
VRSSI (V)
0.8
VRSSI (V)
0.6 0.4
1.2 0.8 0.4
TEMP (deg) -30 0 25 50 70 85
VIN = -60 dBm
VIN = -75 dBm
0.2 0.0 -40
VIN = -90 dBm
-20
0
20
40
60
80
100
0.0 -120 -100 -80 -60 -40 VIN (dBm)
-20
0
20
TA (C)
January 2000 TOKO, Inc.
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TK14588
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 C, unless otherwise specified.
S CURVE 3
VCC 836BH-0268 (TOKO) RD C
VOUT(DC) (V)
2
DET OUTPUT 1 pF 51 k
1
RD = 3.3 k
RD = 1.0 k
RD = 2.0 k
0
9.9
10.3
10.7 fIN (MHz)
11.1
11.5
OUTPUT VOLTAGE vs. MODULATING FREQUENCY 2
0 dB = 208 mVrms RD = 3.3 k
OUTPUT VOLTAGE vs. MODULATING FREQUENCY 2
0 dB = 107 mVrms RD = 2.0 k
C=
0
C=
0
C = 330 pF
-2
-2
C = 330 pF
VOUT (dB)
-4
C = 1000 pF
VOUT (dB)
-4
C = 1000 pF
-6 -8 -10 -12 1 3 10 30 100 300 1000 MODULATING FREQUENCY fm (kHz)
C = 47 pF C = 10 pF
-6 -8 -10 -12 1 3 10 30 100 300 1000 MODULATING FREQUENCY fm (kHz)
C = 47 pF C = 10 pF
OUTPUT VOLTAGE vs. MODULATING FREQUENCY 2
0 dB = 35.2 mVrms RD = 1.0 k
C=
0 -2
C = 330 pF
VOUT (dB)
-4
C = 1000 pF
-6 -8 -10 -12 1 3 10 30 100 300 1000 MODULATING FREQUENCY fm (kHz)
C = 47 pF C = 10 pF
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January 2000 TOKO, Inc.
TK14588
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 C, unless otherwise specified. RSSI Output Voltage Transient Response (IF Input ON/OFF)
C
IF INPUT VOLTAGE = -10, -40, -70 dBm
12 k RSSI OUTPUT
C = 0.01 F
RSSI OUTPUT -10 dBm in -40 dBm in -70 dBm in (0.5V/div) SG GATE PULSE (1V/div)
0.1 ms/div
0.1 ms/div
C = 0.001 F
RSSI OUTPUT -10 dBm in -40 dBm in -70 dBm in (0.5V/div) SG GATE PULSE (1V/div)
20 s/div
20 s/div
C = 0.0001 F
RSSI OUTPUT -10 dBm in -40 dBm in -70 dBm in (0.5V/div) SG GATE PULSE (1V/div)
20 s/div
20 s/div
January 2000 TOKO, Inc.
Page 7
TK14588
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 C, unless otherwise specified. RSSI Output Voltage Transient Response (Power Save ON/OFF)
C
IF INPUT VOLTAGE = -10, -40, -70 dBm
12 k RSSI OUTPUT
C = 0.01 F
POWER SAVE (1V/div)
RSSI OUTPUT -10 dBm in -40 dBm in -70 dBm in (0.5V/div)
C = 0.001 F
0.2 ms/div
POWER SAVE (1V/div)
0.2 ms/div
RSSI OUTPUT -10 dBm in -40 dBm in -70 dBm in (0.5V/div)
20 s/div
20 s/div
C = 0.0001 F
POWER SAVE (1V/div)
RSSI OUTPUT -10 dBm in -40 dBm in -70 dBm in (0.5V/div)
20 s/div
20 s/div
Page 8
January 2000 TOKO, Inc.
TK14588
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 C, unless otherwise specified. RSSI Output Voltage Transient Response (Supply Voltage ON)
C
IF INPUT VOLTAGE = -10, -40, -70 dBm
12 k RSSI OUTPUT
C = 0.01 F
VCC (1V/div)
RSSI OUTPUT -10 dBm in -40 dBm in -70 dBm in (0.5V/div)
C = 0.001 F
0.5 ms/div
VCC (1V/div)
RSSI OUTPUT -10 dBm in -40 dBm in -70 dBm in (0.5V/div)
0.5 ms/div
C = 0.0001 F
VCC (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
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 -40 dBm in, No input (0.5V/div)
2 ms/div
2 ms/div
SUPPLY VOLTAGE ON
VCC (1V/div)
DET OUTPUT -40 dBm in, No input (0.5V/div)
2 ms/div
Page 10
January 2000 TOKO, Inc.
TK14588
PIN FUNCTION DESCRIPTION
TERMINAL PIN NO. 1 2 3 INTERNAL EQUIVALENT CIRCUIT SYMBOL IF INPUT DECOUPLE DECOUPLE VOLTAGE 1.9 V 1.9 V 1.9 V 1: Limiting Amplifier INPUT 2,3: Limiting Amplifier Decoupling DESCRIPTION
VCC 100 k 1.8 k 100 k
4
NC
No internal connection. However, this pin must be connected to GND for noise reduction. VS
100 k 100 k
5
POWER SAVE
Power Save On: VS < 0.3 V Power Save Off: VS = 1.5 V to VCC
6 7 8
VCC COMP OUT COMP GND
3.0 V 0V 7: Data Comparator Output 8: Data Comparator GND
VCC
9 10
COMP INPUT COMP INPUT
VCC
9,10: Data Comparator Input
January 2000 TOKO, Inc.
Page 11
TK14588
PIN FUNCTION DESCRIPTION
TERMINAL PIN NO. 11 12 INTERNAL EQUIVALENT CIRCUIT SYMBOL AMP OUTPUT DET OUTPUT VOLTAGE 1.2 V 1.2 V
1.2 V VCC
DESCRIPTION
11: Amplifier Output 12: Detector Output
13
DET INPUT
3.0 V
VCC
Detector Input
14
IF OUTPUT
1.9 V
100 k
VCC
IF Limiter Output
15
RSSI
VCC
RSSI Output
16
GND
0V
Page 12
January 2000 TOKO, Inc.
TK14588
CIRCUIT DESCRIPTION
AMP OUTPUT DET OUTPUT COMP INPUT COMP INPUT DET INPUT IF OUTPUT
GND
RSSI
GND
+
COMP
VCC
COMP OUTPUT
-
POWER SAVE
DECOUPLE
DECOUPLE
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 VP-P. The input resistance of the IF limiter amplifier is 1.8 k (see Figure 1A). If the impedance of the filter is lower than 1.8 k, 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 . The operating current of the emitter-follower of the IF limiter amplifier output is 200 A. 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 (k)
VCC
330 1.8 K
100 k
200 A
COMP GND
NC
IF INPUT
VCC
FIGURE 1A
January 2000 TOKO, Inc.
+
AMP
IF OUTPUT Re Ie
FIGURE 1B
Page 13
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.
VCC
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 VCC - 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 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 100mV/div 100s/div
AM can be demodulated inside of linear range
RF INPUT - LEVEL (dBu)
FIGURE 3A - AM DEMODULATED WAVEFORM Page 14
FIGURE 3B January 2000 TOKO, Inc.
TK14588
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.
VCC
VCC
VCC
QA
QB
multiplier core circuit
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 mVP-P. The following figures show examples of the phase shifter.
Rz is the characteristic impedance
VCC VCC VCC
Rz Rz Delay Line
LC resonance circuit
ceramic discriminator
delay line
FIGURE 5 - EXAMPLES OF PHASE SHIFTER January 2000 TOKO, Inc. Page 15
TK14588
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. The -3 dB frequency Fc is calculated by the following: V
ref I to V convertor
Fc =
io Demodulated Output Current R0 Demodulated Output Voltage VOUT C0
1 2 C0R0
The S-curve output voltage is calculated by the following as centering around the internal reference voltage Vref: VOUT = Vref io X R0 Where Vref = 1.4 V, maximum of current io = 100 A
FIGURE 6 - INTERNAL EQUIVALENT CIRCUIT OF DETECTOR OUTPUT STAGE
2
0 dB = 35.2 mVrms C=
0 -2 VOUT (dB) -4 -6 -8 -10 -12 1 3 10 30
C = 1000 pF C = 330 pF
Operating Condition: Measured by the standard test circuit. Parallel resistor to phase shift coil = 1 k. fIN = 10.7 MHz, modulation = 100 kHz. External capacitance CO = 0~1000 pF.
C= 10 pF
C= 47 pF
100 300
1000
MODULATING FREQUENCY fm (Hz)
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.
TK14588
CIRCUIT DESCRIPTION (CONT.)
Vref I to V convertor
Demodulated Output Voltage VOUT = VB R1 x io Demodulated Bandwidth Fc = 1 2 C1(1/gm)
io Demodulated Output Current
VB
R1
C1
Demodulated Output Voltage VOUT
1/gm is about 50 k that is the output resistance of the multiplier. Pin 11 is disconnected.
FIGURE 8 - EXAMPLE OF USING EXTERNAL REFERENCE SOURCE Demodulated Output Voltage VOUT = VCC/2 R1 x io
VCC R1 Demodulated Output Voltage VOUT
Demodulated Bandwidth
Fc =
1 2 C1(1/gm)
R2
C1
1/gm is about 50 k that is the output resistance of the multiplier. Pin 11 is disconnected.
R1 = R2
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 A (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
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.
VCC
1 mA
VCC
COMPARATOR OUTPUT STAGE
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.
VCC
BIAS
50 K Vs
FIGURE 12 Page 18 January 2000 TOKO, Inc.
TK14588
TEST BOARD
C1 = C2 = C4 = C6 = C8 = C9 = C10 = 0.01 F C3 = 4.7 F, C5 = 1000 pF, C7 = 1 pF R1 = 51 , R2 = 51 k, R3 = 3.3 k, R4 = 12 k, R5 = 3 k L1 = L2 = 10 H L3 = 836BH-0268 (TOKO)
January 2000 TOKO, Inc.
Page 19
TK14588
PACKAGE OUTLINE
Marking Information
TK14588V
0.35
TSSOP-16
14588
Marking 4.8
AAAAA YYY
4.4 e 0.65
1.0 Recommended Mount Pad 1 Lot. No. 5.0 1.2 max 0.9 0.50
0 ~ 10
0 ~ 0.15
0.25
+0.15 -0.15
e 0.65
0.1 6.4 0.12 M
+ 0.3
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
(c) 1999 Toko, Inc. All Rights Reserved IC-119-TK119xx 0798O0.0K
0.15
+0.15 -0.15
January 2000 TOKO, Inc.
Printed in the USA

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