ZARLINK SL6659

Obsolescence Notice
This product is obsolete.
This information is available for your
convenience only.
For more information on
Zarlink’s obsolete products and
replacement product lists, please visit
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THIS DOCUMENT IS FOR MAINTENANCE
PURPOSES ONLY AND IS NOT
RECOMMENDED FOR NEW DESIGNS
2471-3.1
SL6659
LOW POWER IF/AF CIRCUIT (WITH RSSI) FOR FM RADIO
The SL6659 is a complete single chip mixer, 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 200MHz Operation
■ Exceptionally Stable RSSI
MP16
Fig. 1 Pin connections – top view
APPLICATIONS
■ Cellular Radio Telephones
QUICK REFERENCE DATA
■ Supply Voltage: 2·5V to 7·5V
■ Cordless Telephones
ORDERING INFORMATION
SL6659 NA MP – Miniature plastic DIL package
SL6659 NA MPTD - As above, supplied on tape and reel
■ Sensitivity: 3µV
■ Co-channel Rejection: 7dB
Fig. 2 Block diagram
SL6659
ABSOLUTE MAXIMUM RATINGS
Supply voltage
Storage temperature
Mixer input
8V
255°C to 1150°C
1Vrms
NOTE: This device has static sensitive inputs, sensitivity
typically measured as 500V using MIL-STD-883 method
3015. Therefore, ESD handling precautions are essential to
avoid degradation of performance or permanent damage of
this device.
ELECTRICAL CHARACTERISTICS
The characteristics are guaranteed over the following condltions, unless otherwise stated:
VCC = 2·5V to 7·5V, TAMB = 230°C to 185°C, IF = 455kHz, RF = 50MHz, Quad Coil working Q = 30
Characteristic
Value
Min.
Overall
Supply current
Sensitivity
AM rejection
VBIAS
Co-channel rejection
Mixer
RF input impedance
LO input impedance
LO input bias
Mixer gain
3rd order input intercept
LO input level
LO frequency
IF Amplifier
Gain
Frequency
Differential input impedance
Detector
Audio output level
Ultimate S/N ratio
THD
Output impedance
1·0
Typ.
Max.
1·5
5
3
40
1·2
7
2·0
1
2
5
15
210
180
200
455
300
90
1500
20
75
50
0·9
70
1·22
mA
µV
µV
dB
V
dB
kΩ
kΩ
µA
dB
dBm
mV
MHz
Conditions
20dB SINAD
12dB SINAD
RF input ,500µV
TAMB = 25°C
See Note 2
At VBIAS
RLOAD = 1.5kΩ
dB
kHz
kΩ
125
60
0·5
40
RSSI Output (TAMB = 125°C)
Output current
Current change
Linear dynamic range
1·4
Units
5
25
80
1·5
mV
dB
%
kΩ
µA
µA
µA/dB
dB
5mV into pin 13
No input pin13
Pin 13 = 2·5mV
See Note 1
See Note 1
NOTES
1. The RSSI output is 100% dynamically tested at 5V and 120°C over a 70dB range. First the input to pin 13 is set to 2·5mV and the RSSI current
recorded. Then for each step of 10dB from 240 to 130db, the current is measured. 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, 1kHz modulated signal at an input level to give a 20dB SINAD ratio. Then
a 3kHz deviation 400Hz modulated slgnal on the same frequency is also applied and its level increased to degrade the SINAD to 14dB.
2
SL6659
Fig. 3 Internal schematic
GENERAL DESCRIPTION
The SL6659 is a very low power, high performance integrated
circuit intended for IF amplification and demodulation in FM radio
receivers. It comprises:
● A mixer stage for use up to 200MHz
● A limiting amplifier operating up to 1·5MHz
● A quadrature detector with AF output
● An RSSI (Received Signal Strength Indicator)
ceramic filter. Because of the high gain, pins 11 and 12 must be
adequately bypassed.
Detector
A conventional quadrature detector providing audio output is fed
internally from the IF amplifier; the quadrature input is fed externally
using an appropriate capacitor and phase shift network.
output
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 300µA. The LO input is differential but would normally be
driven single-ended. Special care should be taken to avoid accidental overload of the local oscillator input.
IF Amplifier
The limiting amplifier is capable of operation to at least 1MHz and
the input impedance is set by an external resistor to match the
RSSI Output
The RSSI output is a current source with value proportional to the
logarithm of the IF 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.
Supply Voltage
The SL6659 will operate reliably trom 2·5V to 7·5V. The supply
line must be decoupled with 470nF using short leads.
Internal Bias Voltage
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 typically 14Ω..
3
SL6659
Fig. 4 Audio output v. input and temperature at 2·5V
Fig. 5 Audio output v. input and temperature at 5·0V
Fig. 6
FreeHand 3.11
20/5/94 18:08
Fig. 6 Audio output v. input and temperature at 7·5V
Fig. 7 Audio output v. input and supply voltage at 125°C
Fig. 9
FreeHand 3.11
20/5/94 18:09
Fig. 8 SINAD v. input level
4
Fig. 9 AM rejection and input level
SL6659
Fig. 10
Fig. 11
FreeHand 3.11
FreeHand 3.11
20/5/94 18:11
20/5/94 18:13
Fig. 10 RSSI output v. input and supply voltage
(TAMB = 20°C)
Fig. 11 RSSI output v. input and temperature
(VCC = 2·5V)
Fig. 12
Fig. 13
FreeHand 3.11
FreeHand 3.11
20/5/94 18:14
20/5/94 18:15
Fig. 12 RSSI output v. input level and temperature
(VCC = 5V)
Fig. 13 RSSI output v. input level and temperature
(VCC = 7·5V)
5
SL6659
Fig. 14 (Signal1noise) to noise ratio v. input level
Fig. 15 Supply current v. supply voltage
Fig. 16 Supply current v. temperature
Fig. 17 Circuit diagram of SL6659 demonstration board
6
SL6659
Fig. 18 Track side of demonstration board. Scale = 2:1.
Fig. 19 Ground plane side of demonstration board. Scale = 2:1.
7
SL6659
Fig. 20 Demonstration board surface mount component overlay (track side). Scale = 2:1.
Fig. 21 Demonstration board connectors and through-board component overlay (ground plane side). Scale = 2:1.
8
SL6659
COMPONENT LIST
Resistors
R1
R2*
R3
R4
R5
R6
51Ω
1kΩ
1·5kΩ
10kΩ
1·5kΩ
33kΩ
Capacitors
C1
C2
C3
C4
C5
C6
C7
100nF
10nF
10nF
10pF
330pF
1nF
270pF
C8
C9
C10
C11
C12
C13
Inductors
Filter
470nF L1* 330µH (adjustable),
F1* MURATA
10nF
CAMBION Type 553-7107-43
Type CFW 445 E
100nF RFC* 4·7µH
220nF*
220nF*
220nF
Components marked thus: * are through-board mounted from the ground plane side; all other components are
surface mounted on the track side. See Figs. 20 and 21.
9
SL6659
NOTES
10
SL6659
NOTES
11
SL6659
PACKAGE DETAILS
Dimensions are shown thus: mm (in).
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, CA95067-0017
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 Fax : (1) 64 46 06 07
● GERMANY Munich Tel: (089) 3609 06-0 Fax : (089) 3609 06-55
● ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993
● JAPAN Tokyo Tel: (3) 5276-5501 Fax: (3) 5276-5510
● NORTH AMERICA Scotts Valley, USA Tel: (408) 438 2900 Fax: (408) 438 7023.
● SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872
● SWEDEN Stockholm Tel: 46 8 702 97 70 Fax: 46 8 640 47 36
● TAIWAN, ROC Taipei Tel: 886 2 5461260 Fax: 886 2 7190260
● UK, EIRE, DENMARK, FINLAND & NORWAY
Swindon Tel: (0793) 518510 Fax : (0793) 518582
These are supported by Agents and Distributors in major countries world-wide.
© GEC Plessey Semiconductors 1994 Publication No. DS2471 Issue No. 3.1 June 1994
TECHNICAL DOCUMENTATION – NOT FOR RESALE. PRINTED IN UNITED KINGDOM
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.
12
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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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TECHNICAL DOCUMENTATION - NOT FOR RESALE