ZARLINK SL6654

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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
QUICK REFERENCE DATA
Fig. 1 Pin connections (top view)
Supply Voltage 2.5V to 7 5V
Sensitivity 3µV
Co-Channel Rejection 7dB
VCC
VCC
20 - 40p
1n
33p
33k
270p
X1
39k
0V
33k
8p2
17
VCC
10µ
220n
8p2
15
16
10p
6
5
2
50µA
OSCILLATOR
INPUT
200mV
RMS
C
B
330p
DETECTOR
3
1µA
E
4
OSCILLATOR
TRANSISTOR
40k
AUDIO
OUTPUTS
270p
0V
SL6652
+15dB (ADJUSTABLE)
100MHz MAX
18 8µA
2k
RFC
+90dB (LIGHTING)
1.5MHz MAX
MIXER
1
11
RSSI
IF AMP
20k
1n
7
200k
1k
BIAS
8
10k
10n
RSSI
10n
8µA
MIXER
INPUT
3µV
1k
200k
9
10
+1.2V
1.5k
100n
LOAD
RESISTOR
14
13
12
220n
CERAMIC
FILTER
220n
Fig. 2 block diagram
1.5k
(TO MATCH FILTER)
100n
SL6654
ABSOLUTE MAXIMUM RATINGS
Supply voltage
Storage temperature
Operating temperature
Mixer input
8V
-55°C to +150°C
-55°C to +125°C
1V rms
ELECTRICAL CHARACTERISTICS
Test conditions (unless otherwise stated):
VCC = 2.5V to 7.5V, Tamb = -30°C to +85°C, IF = 455kHz, RF = 50MHz, Quad Coil Working Q = 30
Value
Characteristics
Units
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 = +25°C)
Output current
Output current
Current change
Linear dynamic range
1.0
Typ.
Max.
1.5
5
3
40
1.2
7
20
10
1.4
1
2
5
15
-10
180
100
300
40
30
70
455
kohm
kohm
µA
dB
dBm
mV
MHz
µA
500
MHz
90
1500
20
dB
kHz
kohm
75
125
60
0.5
40
65
50
0.9
70
mA
µV
µV
dB
V
dB
1.22
5
20
80
1.5
Conditions
20dB SINAD
12dB SINAD
RF input <500µV
Tamb = 25°C
See Note 2
At Vbias
Rload = 1.5k
Tamb = 25°C
40 ... 70µA
40 ... 70µA
mV
dB
%
kohm
dB
1kHz
µA
µA
µA/dB
dB
No input pin 14
Pin 14 = 2.5mV
See Note 1
See Note 1
5mV into pin 14
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
1
18
13
15
11
14
12
4k
200k
7
8
BAND-GAP
REFERENCE
6
3
4
BIAS
2
40k
40k
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:
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.
●
●
●
●
●
●
IF amplifier
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
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
Detector
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 300µA. 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.
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.
Oscillator
The oscillator consists of an uncommitted transistor and a
separate current sink. The user should ensure that the design
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.
SL6654
Supply voltage
Detector
The SL6652 will operate reliably from 2.5V to 7.5V The
supply line must be decoupled with 470nF using short leads.
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 +25°C
Fig. 8 SINAD and input level
Fig. 9 AM rejection and input level
SL6654
Fig. 10 RSSI output vs input and supply voltage
(Tamb = 20°C)
Fig. 12 RSSI output vs input level and temperature
(TCC = 5V)
Fig. 11 RSSI output vs input level and temperature
(VCC = 2.5V)
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.
 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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visit our Web Site at
www.zarlink.com
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of any order or contract nor to be regarded as a representation relating to the products or services concerned. The products, their specifications, services and other
information appearing in this publication are subject to change by Zarlink without notice. No warranty or guarantee express or implied is made regarding the
capability, performance or suitability 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. Manufacturing does
not necessarily include testing of all functions or parameters. 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 Zarlink’s conditions of sale which are available on request.
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