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Ordering number: EN 4077A
Monolithic Linear IC
LA8608V
1.8 V Low-Voltage Narrowband FM-IF System
Overview
The LA8608V is a narrowband FM-IF system intended for communications equipment, operates at just 1.8 V, and is contained in an ultrasmall package with a 0.65 mm pitch. In addition to the various functions needed for reception, the LA8608V also offers other functions such as noise detection and electric field intensity detection, and is optimum for compact designs, such as for cordless phones.
Package Dimensions
unit : mm
3175A-SSOP24
[LA8608V]
24 13 1.0 5.6 0.1 0.43 1.6max 0.15
. 2nd mixer, 2nd local oscillator, IF amplifier, limiter, . quadrature detector, signal meternoise detector, Schmitt Noise detector, noise amplifier,
trigger, comparator
1 8.0 12
Features
. Because this IC has three independent noise detection and . . .
amplification amplifiers, it can be used to form a secondary biquad bandpass filter; furthermore, because it is equipped with detector and Schmitt trigger functions, it can be easily used for carrier sense applications. Broad signal meter linearity (70 dB typ.) Low operating voltage: 1.8 V to 6 V Small package: SSOP-24 (0.65 mm pitch)
0.22
0.65
SANYO : SSOP24
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
53095HA (II) No.4077-1/14
0.5
7.6
Functions
LA8608V
Specifications
Maximum Ratings at Ta = 25 C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCCmax Pd max Topr Tstg Conditions Ratings 8.0 300 -20 to +75 -40 to +125 Unit V mW C C
Operating Conditions at Ta = 25 C
Parameter Recommended supply voltage Operating supply voltage range Symbol VCC VCC op Conditions Ratings 3.0 1.8 to 6.0 Unit V V
Operating Characteristics at Ta = 25 C, VCC = 3 V, fC = 21.7 MHz, fmod = 1 kHz, dev = 3 kHz
Parameter Quiescent current -3 dB limiting sensitivity Demodulation output S/N ratio AM rejection ratio Total harmonic distortion Noise detection output Symbol Icco -3dBL.S. VO S/N(1) S/N(2) AMR THD VND(1) VND(2) VND(3) VND(4) SH SHhy VSH(1) VSH(2) VSM(1) VSM(2) VSM(3) VCOMP(1) VCOMP(2) GM Output No input -3 dB Vin = 80 dB Vin = 80 dB, Non-modulation Vin = 20 dB, Non-modulation Vin = 80 dB, AM 30% modulation Vin = 80 dB Vin = 10 dB, VCC = 2.1 V Vin = 10 dB, VCC = 3.0 V Vin = 10 dB, VCC = 5.0 V Vin = 30 dB min typ 2.8 5 170 60 25 40 0.7 1.9 2.2 2.3 0 20 1 max 3.8 11 230 Unit mA dB mVrms dB dB dB % V V V V dB dB V V V V V V V dB MHz k k k k
115 54 20 30
2.0 2.8 0.1 27 0.5
1.6
Schmitt trigger level Schmitt hysteresis Schmitt output level Signal meter output
12 Vin = 13 dB Vin = 26 dB Vin = 5 dB Vin = 50 dB Vin = 80 dB V9 = 1.5 V V9 = 0.9 V
2.8 0.8 1.3 2.8 0.1 1.1 1.6 0.3 1.4 2.0 0.5 20 90 3.6 1.8 1.8 2.4
Comparator output Mixer conversion gain Mixer input frequency Mixer input resistance Mixer output resistance IF input resistance FM detection output impedance
No.4077-2/14
LA8608V
Block Diagram and Pin Assignment
Unit (resistance:, capacitance:F)
Pins 1. CRYSTAL 2. OSC 3. MIX-OUT 4. VREF 5. VCC 6. IF-IN 7. D.C1 8. D.C2
9. COMP(+) 10. COMP-OUT 11. LIMT.OUT 12. QUAD-COIL 13. SCHMITT-OUT 14. S.DET. 15. DET-OUT 16. IN(-)1
17. 18. 19. 20. 21. 22. 23. 24.
OUT1 IN(-)2 OUT2 IN(-)3 OUT3 NOISE-DET. GND MIX-IN
No.4077-3/14
LA8608V
AC Test Circuit
Unit (resistance:, capacitance:F)
Sample Application Circuit (1)
Unit (resistance:, capacitance:F)
No.4077-4/14
LA8608V
Sample Application Circuit (2)
Unit (resistance:, capacitance:F)
Allowable power dissipation, Pd max - mW
Ambient temperature, Ta - C
No.4077-5/14
LA8608V
Pin Description
Unit (resistance:)
Pin No. 1 Pin Name CRYSTAL Pin Voltage [V] VCC Internal equivalent circuit Remarks Forms a Colpitts oscillator.
2
OSC
VCC-0.7
3
MIX-OUT
VCC-0.3
MIX buffer output
4
VREF
1.2V
Regulated voltage output
5 6
VCC IF-IN
VCC VCC-0.9
Power supply IF amp input
7
D.C1
VCC-0.9
IF amp DC feedback
8
D.C2
VCC-0.9
9
COMP (+)
Comparator threshold setting pin; set by external resistance
10
COMP-OUT
Comparator output; open collector
11
LIM.OUT
0.2
Limiter amp output
12
QUAD-COIL
VCC
Discriminator connection
13
SCHMITT-OUT
Noise Schmitt output; open collector
Continued on next page.
No.4077-6/14
LA8608V
Continued from preceding page. Unit (resistance:)
Pin No. 14 Pin Name S.DET Pin Voltage [V] 0.1 to 1.5 Internal equivalent circuit Remarks Electric field intensity signal output
15
DET-OUT
1.2
FM detection output
16
IN (-)1
1.0
Operational amplifier negative input
17
OUT1
1.0
Operational amplifier output
18
IN (-)2
1.0
Operational amplifier negative input
19
OUT2
1.0
Operational amplifier output
20
IN (-)3
1.0
Operational amplifier negative input
21
OUT3
1.0
Operational amplifier output
22
NOISE-DET
0 to 1.4
Noise wave detection output
23 24
GND MIX-IN
0 1.2
GND Mixer input
No.4077-7/14
LA8608V
IC Usage Notes
1. About the local oscillator
Fig. 1 Fig. 1 shows the equivalent circuit for the local oscillator. In this circuit, when C1 = 22 pF, the change in the negative resistance versus C2 is shown in Fig. 2, the change in the operational load capacitance is shown in Fig. 3, and the frequency deviation is shown in Fig. 4. In the application circuit, C2 = 120 pF, and in this case the negative resistance according to Fig. 2 is -58 . In order to increase the negative resistance, it is necessary to decrease the value of C2. To increase the oscillation level, it is possible to add external resistor R1 and raise the local oscillator current. However, the oscillation level on pin 1 must be set to 110 dB or less. If set to a greater level, distortion will occur in the oscillation waveform.
Fig. 2 Operating load capacitance, CL -- pF Fig. 4 Frequency deviation, f -- ppm
Fig. 3
Negative resistance, R --
(Note) Fig 2 to 4: C1 = 22 pF Figs. 3, 4: Reference to operating load capacitance 16 pF
No.4077-8/14
LA8608V
2. About the built-in operational amplifiers The LA8608V has three independent operational amplifiers on chip that can be used as needed. If they are not to be used, short the I/O pins. Sample application 1: Noise amplifier
Using the three operational amplifiers, it is possible to form a secondary biquad bandpass filter. (For details on the filter response characteristics, refer to the data provided later.)
Fig. 5 The calculation of the transfer function for the above diagram is as shown below. 02 = R5 C1C2R3R4R6
1 0 = C1R2 Q H= R2R5 R1R4
In normal use, R3 = R4 = R5 = R6 = Rf, and C1 = C2 = Cf: Therefore, 0 = 1 CfRf 1 2CfRf Q = CfR2 x 0 R2 Rf H= R2Rf R1Rf R2 R1 fo = center frequency, H = pass band gain, Q = selectivity
fO =
=
=
No.4077-9/14
LA8608V
Noise amplified by this amp passes through the noise detector, and is detected by R and C connected to pin 22. The Schmitt circuit operates on the basis of this DC, and the Shmitt output appears on pin 13. Because the pass band gain is determined by R2/R1, changing these resistances makes it possible to vary the Schmitt circuit level to some extent. By varying the level, it is possible to continue operating Schmitt circuit up to a signal-to-noise ratio of approximately 30 dB on the No. 2 mixer input. To continue operating Schmitt circuit at a higher S/N ratio, add a resistor between pin 17 and GND. This makes it possible to increase the signal-to-noise ratio of the input level at which the Schmitt circuit continue operating by approximately 10 dB. (Refer to Fig. 6.) S/N for noise amp gain and Schmitt trigger S/N for noise Schmitt trigger -- dB
Misoperation when Ri < 1 k
With RB
Misoperation when Ri < 12 k No RB
Unit (resistance: , capacitance: F) Fig. 6
Sample application 2: (1) When an operational amplifier is used in a signal system amplifier, etc., connect a capacitor of about 1000 pF between the output (pins 17, 19, 21) and GND. This capacitor prevents local oscillation when the signal is clipped on the negative side.
Fig. 7
(2) When used in the signal system amplifier, etc. and the dynamic range of the output must be expanded, use the scheme described below.
1) Use RB1 to set the output DC voltage to approximately 1/2VCC . Output DC voltage VODC = VB (1 + VB = 1 V R2 R3 )
2) Add 10 k between the output pin and GND. Fig. 8
No.4077-10/14
LA8608V
Reference voltage (Pin 3), Vref -- V Demodulation output, noise output, AM output -- dBm
Icco, Vref -- VCC
Vo, Noise, AM-OUT -- VIN
Demodutation output
Quiescent, Icco -- mA
(Mitsumi)
Noise output
Unit (resistance: , capacitance: F)
Supply voltage, VCC -- V
THD -- dB Demodutation output, Noise output, AM output -- dBm
Demodutation output, VO -- dBm -3 dBL.S.20dB SIN AD -- dB
Input voltage, VIN -- dB Vo, -3dB L.S. 20dB SIN AD -- VCC
Vo, Noise, AM-OUT, THD -- VIN
(Murata)
Demodutation output
Referenced to VIN = 80 dB
Unit (resistance: , capacitance: F)
Noise output
Input voltage, VIN -- dB Detuning characteristics
Total harmonic distortion
Supply voltage,VCC -- V S curve output
Unit (resistance: , capacitance: F)
When using coil
Ceramic discriminator
Detuning frequency, f -- kHz When using a ceramic discriminator
Detection coil YD0051 (Mitsumi) Discriminator CDBM455C7 (Murata)
Coil
Signal meter output voltage, VSM -- V
Unit (resistance: , capacitance: F)
Noise detection output voltage, VND -- V
Detuning frequency f -- kHz (21.70MHz) VSM -- VIN
VND -- VIN
Unit (resistance: , capacitance: F)
Input voltage, VIN -- dB
Input voltage, VIN -- dB No.4077-11/14
LA8608V
f Response Schmitt trigger level
Input voltage, VIN -- dB
Schmitt off Schmitt on
Response -- dB
Frequency, f -- Hz -3dB L.S. 20dB SIN AD -- VOSC -3dBL.S.20 dB SIN AD -- dB Mixer conversion gain -- dB
Supply voltage, VCC -- V Third intercept point
Mixer conversion gain
Output level -- dBm
VOSC -- dB
Demodutation, Noise output, Noise, Vo -- dBm
Input level -- dBm Noise, Vo -- VIN
Vref, Icco -- VCC Reference voltage (Pin 3), Vref -- V
Supply voltage, VCC -- V VSM -- Ta --V
Quiescent current Icco -- mA
Input voltage, VIN -- dB VIN -- Ta
Pin 22 supply voltage, Pin 22 output voltage -- V
Signal meter output Voltage VSM
Saturation level at no input
Schmitt on
Unit (resistance: , capacitance: F)
Schmitt off
Ambient temperature, Ta -- C
Ambient temperature, Ta -- C No.4077-12/14
LA8608V
S curve output temperature characteristics (1) S curve output temperature characteristics (2)
Non-modulation
Using YD0051 (Mitsumi)
Non-modulation Using CDBM455C7 (Murata)
Detuning frequency, f - kHz
Detuning frequency f -- kHz
Dct-OUT -- VIN
When using coil
(Mitsumi)
Iosc -- VCC Local oscillation current, Iosc -- A
Pin 15 DC output, Dct-OUT -- V
Input voltage, VIN -- dB IOSC -- Ta Local oscillation current, Iosc -- A Demodutation output, VO -- V
Supply voltage, VCC -- V Vo, THD -- Ta Total harmonic distortion, THD -- % No.4077-13/14
used
THD: 400 to 30 kHz BPF used
Ambient temperature, Ta -- C Schmitt off Schmitt trigger level -- dB Schmitt on
S/N ratio (S/N), AM rejection ratio (AMR) -- dB
Ambient temperature, Ta -- C
S/N at Vin = 20 dB
Ambient temperature, Ta -- C
LA8608V
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products(including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of May, 1995. Specifications and information herein are subject to change without notice. PS No.4077-14/14

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