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THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS
SL6654 IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS
DS 3286 -1
SL6654
LOWER POWER IF/AF CIRCUIT (WITH RSSI) FOR FM CELLULAR RADIO
The SL6654 is a complete single chip mixer/oscillator, IF amplifier and detector for FM cellular radio, cordless telephones and low power radio applications. It features an exceptionally stable RSSI (Received Signal Strength Indicator) output using a unique system of detection. Supply current is less than 2mA from a supply voltage in the range 2.5V to 7.5V.
FEATURES
Low Power Consumption (1.5mA) Single Chip Solution Guaranteed 100MHz Operation Exceptionally Stable RSSI
APPLICATIONS
Cellular Radio Telephones Cordless Telephones
MP18
Fig. 1 Pin connections (top view)
QUICK REFERENCE DATA
Supply Voltage 2.5V to 7 5V Sensitivity 3V Co-Channel Rejection 7dB
VCC 33p 270p 33k 1n 33k 8p2 17 OSCILLATOR INPUT 200mV RMS C 16 B 15 50A E 4 OSCILLATOR TRANSISTOR 0V 40k 270p AUDIO OUTPUTS 8p2 6 20 - 40p X1 10 0V 220n 10p 5 2 DETECTOR 3 1A VCC 39k 330p VCC
+15dB (ADJUSTABLE) 100MHz MAX 18 8A RFC 2k 1 8A MIXER INPUT 3V 1n 7 1k BIAS 8 10k 10n +1.2V 100n MIXER
SL6652
+90dB (LIGHTING) 1.5MHz MAX IF AMP 11 RSSI 1k RSSI 10n 200k 200k 100n
20k
9 1.5k LOAD RESISTOR
10 CERAMIC FILTER
14
13 220n
12
220n
1.5k (TO MATCH FILTER)
Fig. 2 block diagram
SL6654
ABSOLUTE MAXIMUM RATINGS
Supply voltage Storage temperature Operating temperature Mixer input 8V -55C to +150C -55C to +125C 1V rms
ELECTRICAL CHARACTERISTICS
Test conditions (unless otherwise stated): VCC = 2.5V to 7.5V, Tamb = -30C to +85C, IF = 455kHz, RF = 50MHz, Quad Coil Working Q = 30 Value Characteristics Min. Overall Supply current Sensitivity AM rejection Vbias Co-channel rejection Mixer RF input impedance OSC input impedance OSC input bias Mixer gain 3rd order input intercept OSC input level OSC frequency Oscillator Current sink Hfe fT IF Amplifier Gain Frequency Diff. input impedance Detector Audio output level Ultimate S/N ratio THD Output impedance Inter-output isolation RSSI Output (Tamb = +25C) Output current Output current Current change Linear dynamic range Typ. Max. Units Conditions
1.0
1.5 5 3 40 1.2 7
20 10
1.4
mA V V dB V dB
20dB SINAD 12dB SINAD RF input <500V Tamb = 25C See Note 2
1 2 5 15 -10 180 100 300
kohm kohm A dB dBm mV MHz A MHz
At Vbias Rload = 1.5k
40 30 500
70
Tamb = 25C 40 ... 70A 40 ... 70A
455
90 1500 20
dB kHz kohm
75 60 0.5 40 65
125 5
mV dB % kohm dB A A A/dB dB
5mV into pin 14
1kHz
50 0.9 70
1.22
20 80 1.5
No input pin 14 Pin 14 = 2.5mV See Note 1 See Note 1
NOTES 1. The RSSI output is 100% dynamically tested at 5V and +20 C over a 70dB range. First the input to pin 14 is set to 2.5mV and the RSSI current recorded Then for each step of 10dB from -40 to +30dB the current is measured again. The current change in each step must meet the specified figure for current change. The RSSI output is guaranteed monotonic and free from discontinuities over this range. 2. Co-channel rejection is measured by applying a 3kHz deviation, 1 kHz modulated signal at an input level to give a 20dB SINAD ratio. Then a 3kHz deviation, 400Hz modulated signal on the same frequency is also applied and its level increased to degrade the SINAD to 14dB.
SL6654
5 17 200k 16 9 10 13 15 1 18 11 14
4k
12 200k
7
6
8
BAND-GAP REFERENCE
3 4 2 40k 40k BIAS
Fig. 3 Internal schematic
GENERAL DESCRIPTION
The SL6654 is a very low power, high performance integrated circuit intended for IF amplification and demodulation in FM radio receivers. It comprises:
q q q q q q
of oscillator is suitable for the type of crystal and frequency required; it may not always be adequate to duplicate the design shown in this data sheet.
A mixer stage for use up to lOOMHz An uncommitted transistor for use as an oscillator A current sink for biasing this transistor A limiting amplifier operating up to 1.5MHz A quadrature detector with differential AF output An RSSI (Received Signal Strength Indicator) output
IF amplifier
The limiting amplifier is capable of operation to at least 1 MHz and the input impedance is set by an external resistor to match the ceramic filter. Because of the high gain, pins 12 and 13 must be adequately bypassed.
Mixer
The mixer is single balanced with an active load. Gain is set externally by the load resistor although the value is normally determined by that required for matching into the ceramic filter. It is possible to use a tuned circuit but an increase in mixer gain will result in a corresponding reduction of the mixer input intercept point. The RF input is a diode-biased transistor with a bias current of typically 300A. The oscillator input is differential but would normally be driven single-ended. Special care should be taken to avoid accidental overload of the oscillator input.
Detector
A conventional quadrature detector is fed internally from the IF amplifier; the quadrature input is fed externally using an appropriate capacitor and phase shift network. A differential output is provided to feed a comparator for digital use, although it can also be used to provide AFC.
RSSI output
The RSSI output is a current source with value proportional to the logarithm of the IF input signal amplitude. There is a small residual current due to noise within the amplifier (and mixer) but beyond this point there is a measured and guaranteed 70dB dynamic range. The typical range extends to 92dB, independent of frequency, and with exceptionally good temperature and supply voltage stability.
Oscillator
The oscillator consists of an uncommitted transistor and a separate current sink. The user should ensure that the design
SL6654
Supply voltage
The SL6652 will operate reliably from 2.5V to 7.5V The supply line must be decoupled with 470nF using short leads.
Detector
The internal band gap reference must be externally decoupled. It can be used as an external reference but must not be loaded heavily; the output impedance is tyically 14 ohms.
Fig. 4 Audio output vs input and temperature at 2.5V
Fig. 5 Audio output vs input and temperature at 5.0V
Fig. 6 Audio output vs input and temperature at +7.5V
Fig. 7 Audio output vs input and supply voltage at +25C
Fig. 8 SINAD and input level
Fig. 9 AM rejection and input level
SL6654
Fig. 10 RSSI output vs input and supply voltage (Tamb = 20C)
Fig. 11 RSSI output vs input level and temperature (VCC = 2.5V)
Fig. 12 RSSI output vs input level and temperature (TCC = 5V)
Fig. 13 RSSI output vs input level and temperature (VCC = 7.5V)
SL6654
Fig. 14 Signal + noise to noise ratio vs input level
Fig. 15 Supply current vs supply voltage
Fig. 16 Supply current vs temperature (VCC = 5V)
SL6654
HEADQUARTERS OPERATIONS GEC PLESSEY SEMICONDUCTORS Cheney Manor, Swindon, Wiltshire SN2 2QW, United Kingdom. Tel: (0793) 518000 Fax: (0793) 518411 GEC PLESSEY SEMICONDUCTORS P.O. Box 660017 1500 Green Hills Road, Scotts Valley, California 95067-0017, United States of America. Tel: (408) 438 2900 Fax: (408) 438 5576
CUSTOMER SERVICE CENTRES * FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Tx: 602858F Fax : (1) 64 46 06 07 * GERMANY Munich Tel: (089) 3609 06-0 Tx: 523980 Fax : (089) 3609 06-55 * ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993 * JAPAN Tokyo Tel: (03) 3296-0281 Fax: (03) 3296-0228 * NORTH AMERICA Integrated Circuits and Microwave Products Scotts Valley, USA Tel (408) 438 2900 Fax: (408) 438 7023. Hybrid Products, Farmingdale, USA Tel (516) 293 8686 Fax: (516) 293 0061. * SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872 * SWEDEN Stockholm, Tel: 46 8 702 97 70 Fax: 46 8 640 47 36 * UNITED KINGDOM & SCANDINAVIA Swindon Tel: (0793) 518510 Tx: 444410 Fax : (0793) 518582 These are supported by Agents and Distributors in major countries world-wide. (c) GEC Plessey Semiconductors 1992 Publication No. DS3286 Issue No. 1.0 May 1992
This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. The Company reserves the right to alter without prior knowledge the specification, design or price of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user's responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. These products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to the Company's conditions of sale, which are available on request.
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Purchase of Zarlink's I2C components conveys a licence under the Philips I2C Patent rights to use these components in and I2C System, provided that the system conforms to the I2C Standard Specification as defined by Philips. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright Zarlink Semiconductor Inc. All Rights Reserved.
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