 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| 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] Functions . 2nd mixer, 2nd local oscillator, IF amplifier, limiter, . quadrature detector, signal meternoise detector, Schmitt Noise detector, noise amplifier, trigger, comparator 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) SANYO : SSOP24 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 SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 53095HA (II) - No.4077 1/14 LA8608V 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 No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. 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. No.4077 - 14/14 |
Price & Availability of LA8608
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |