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SA58640
Low-voltage mixer FM IF system
Rev. 01 -- 1 November 2004 Objective data sheet
1. Introduction
The SA58640 was designed for cordless telephone applications in which efficient and economic integrated solutions are required and yet high performance is desirable. Although the product is not targeted to meet the stringent specifications of high performance cellular equipment, it will exceed the needs for analog cordless phones. The minimal amount of external components and absence of any external adjustments makes for a very economical solution.
2. General description
The SA58640 is a low-voltage monolithic FM IF system incorporating a mixer/oscillator, two limiting intermediate frequency amplifiers, quadrature detector, logarithmic RSSI, voltage regulator and audio and RSSI opamps. The SA58640 is available in a 20-pin SSOP.
3. Features

Low power consumption: 5.0 mA typical at 5 V Mixer input to >100 MHz Mixer conversion power gain of 17 dB at 45 MHz XTAL oscillator effective to 100 MHz (LC oscillator or external oscillator can be used at higher frequencies) 102 dB of IF amp/limiter gain 2 MHz IF amp/limiter small signal bandwidth Temperature compensated logarithmic RSSI with a 70 dB dynamic range Low external component count; suitable for crystal/ceramic/LC filters Audio output internal opamp RSSI output internal opamp Internal opamps with rail-to-rail outputs ESD protection: Human body model 2 kV; robot model 200 V
4. Applications
Cordless phones
Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
5. Ordering information
Table 1: Ordering information Package Name SA58640DK SSOP20 Description plastic shrink small outline package; 20 leads; body width 4.4 mm Version SOT266-1 Type number
6. Block diagram
20
19
18
17
16
15
14
13
12
11
IF amp mixer OSCILLATOR
RSSI
limiter quad
E 1 2 3
B 4 5
VREG 6 7
audio 8 9 10
002aab125
Fig 1. Block diagram
7. Pinning information
7.1 Pinning
RF IN+ RF IN- DECOUPLING OSCOUT OSCIN RSSI OUT VCC AUDIO FEEDBACK AUDIO OUT RSSI FEEDBACK
1 2 3 4 5 6 7 8 9
20 MIXER OUT 19 IF AMP DECOUPLING 18 IF AMP IN 17 IF AMP DECOUPLING 16 IF AMP OUT 15 GND 14 LIMITER IN 13 LIMITER DECOUPLING 12 LIMITER DECOUPLING 11 LIMITER OUT
002aab134
SA58640DK
QUADRATURE IN 10
Fig 2. Pin configuration
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Objective data sheet
Rev. 01 -- 1 November 2004
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Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
7.2 Pin description
Table 2: Symbol RF IN+ RF IN DECOUPLING OSCOUT OSCIN RSSI OUT VCC AUDIO FEEDBACK AUDIO OUT RSSI FEEDBACK QUADRATURE IN LIMITER OUT LIMITER DECOUPLING LIMITER DECOUPLING LIMITER IN GND IF AMP OUT IF AMP DECOUPLING IF AMP IN IF AMP DECOUPLING MIXER OUT Pin description Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Description positive RF mixer input negative RF mixer input, decoupling oscillator output (emitter) oscillator input (base) RSSI amplifier output positive supply audio amplifier negative input, feedback audio amplifier output RSSI amplifier negative input, feedback quadrature detector input limiter amplifier output limiter decoupling limiter decoupling limiter amplifier input ground IF amplifier output IF amplifier decoupling IF amplifier input IF amplifier decoupling mixer output
8. Functional description
The SA58640 is an IF signal processing system suitable for second IF systems with input frequency as high as 100 MHz. The bandwidth of the IF amplifier and limiter is at least 2 MHz with 90 dB of gain. The gain/bandwidth distribution is optimized for 455 kHz, 1.5 k: source applications. The overall system is well-suited to battery operation as well as and high quality products of all types. The input stage is a Gilbert cell mixer with oscillator. Typical mixer characteristics include a noise figure of 7.0 dB, conversion gain of 17 dB, and input third-order intercept of 10 dBm. The oscillator will operate in excess of 100 MHz in LC tank configurations. Hartley or Colpitts circuits can be used up to 100 MHz for XTAL configurations. The output impedance of the mixer is a 1.5 k: resistor permitting direct connection to a 455 kHz ceramic filter. The input resistance of the limiting IF amplifiers is also 1.5 k:. With most 455 kHz ceramic filters and many crystal filters, no impedance matching network is necessary. The IF amplifier has 44 dB of gain and 5.5 MHz bandwidth. The IF limiter has 58 dB of gain and 4.5 MHz bandwidth. To achieve optimum linearity of the log signal strength indicator, there must be a 12 dB(V)1 insertion loss between the first and second IF stages. If the IF filter or interstage network does not cause 12 dB(V) insertion loss, a
1. dB(V) = 20log Vo/Vi.
(c) Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9397 750 14161
Objective data sheet
Rev. 01 -- 1 November 2004
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Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
fixed or variable resistor or an L pad for simultaneous loss and impedance matching can be added between the first IF output (pin 16) and the interstage network. The overall gain will then be 90 dB with 2 MHz bandwidth. The signal from the second limiting amplifier goes to a Gilbert cell quadrature detector. One port of the Gilbert cell is internally driven by the IF. The other output of the IF is AC-coupled to a tuned quadrature network. This signal, which now has a 90q phase relationship to the internal signal, drives the other port of the multiplier cell. The demodulated output of the quadrature drives an internal opamp. This opamp can be configured as a unity gain buffer, or for simultaneous gain, filtering, and 2nd-order temperature compensation if needed. It can drive an AC load as low as 10 k: with a rail-to-rail output. A log signal strength indicator completes the circuitry. The output range is greater than 70 dB and is temperature compensated. This signal drives an internal opamp. The opamp is capable of rail-to-rail output. It can be used for gain, filtering, or 2nd-order temperature compensation of the RSSI, if needed.
9397 750 14161
(c) Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Objective data sheet
Rev. 01 -- 1 November 2004
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Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
9. Limiting values
Table 3: Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol VCC Tstg Tamb Zth Parameter single supply voltage storage temperature range operating ambient temperature range thermal impedance Conditions Min 65 40 Max 7 150 85 117 Unit V qC qC qC/W
10. Static characteristics
Table 4: Static characteristics Tamb = 25 qC; VCC = +5 V, unless otherwise stated. [1] Symbol VCC ICC
[1]
Parameter power supply voltage range DC current drain
Conditions
Min 4.5 -
Typ 5.0
Max 6.0 6.0
Unit V mA
RF frequency = 45 MHz; +14.5 dBV RF input step-up; IF frequency = 455 kHz; R17 = 2.4 k: and R18 = 3.3 k:; RF level = dBm; FM modulation = 1 kHz with 5 kHz peak deviation. Audio output with de-emphasis filter and C-message weighted filter. See Figure 3 "45 MHz application circuit" on page 7. The parameters listed above are tested using automatic test equipment to assure consistent electrical characteristics. The limits do not represent the ultimate performance limits of the device. Use of an optimized RF layout will improve many of the listed parameters.
45
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(c) Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Objective data sheet
Rev. 01 -- 1 November 2004
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Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
11. Dynamic characteristics
Table 5: Symbol fin fosc Dynamic characteristics Parameter input frequency crystal oscillator frequency noise figure at 45 MHz third-order input intercept point (50 : source) PG(conv) Ri(RF) Ci(RF) Ro(mix) IF section Ga(IF) LG IF amp gain limiter gain AM rejection audio level SINAD sensitivity THD S/N total harmonic distortion signal-to-noise ratio IF RSSI output, R9 = 2 k: [1] RSSI range Zi(IF) Zo(IF) Zi(lim) Zo(lim) VO(lim) IF input impedance IF output impedance limiter input impedance limiter output impedance limiter output voltage system SINAD sensitivity
[1]
Conditions
Min -
Typ 100 100 7.0 10
Max -
Unit MHz MHz dB dBm
mixer/oscillator section (external LO = 220 mVRMS)
f1 = 45.0; f2 = 45.06 MHz Input RF level = 52 dBm matched 14.5 dBV step-up 50 : source single-ended input (pin 20)
-
conversion power gain RF input resistance RF input capacitance mixer output resistance
10 1.25
17 2.5 8 3.0 1.5
4.0 -
dB dB k: pF k:
50 : source 50 : source 30 % AM 1 kHz gain of two IF level = 110 dBm
60 -
44 58 50 120 17 55 60 0.5 1.7 60 1.5 0.3 1.5 0.3 130 12
1.0 2.4 -
dB dB dB mV dB dB dB V V dB k: k: k: k: mVRMS dB
no modulation for noise IF level = 110 dBm IF level = 50 dBm pin 18 pin 16 pin 14 pin 11 pin 11 RF level = 110 dBm
1.3 1.3 -
RF/IF section (internal LO)
The generator source impedance is 50 but the SA58640 input impedance at pin 18 is 1500 As a result, IF level refers to the actual signal that enters the SA58640 input (pin 18) which is about 21 dB less than the `available power' at the generator.
:,
:.
9397 750 14161
(c) Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Objective data sheet
Rev. 01 -- 1 November 2004
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Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
12. Application information
C26 R18 3.3 k
R17 2.4 k FLT1 FLT2 C23 C21
C15 C18 C17
20
19
18
17
16
15
14
13
12
11
IF amp mixer OSCILLATOR
RSSI
limiter quad
E 1
C1
B 4 5
VREG 6
audio 7
R11 10 k
2
3
8
9
10
C8 C9
C2
L1
C7 L2 C6 X1 C10
R10 10 k C27 2.2 F
C12 R19 11 k C19 390 pF C14 IFT1
C5
45 MHz input RSSI output VCC
audio
002aab126
Fig 3. 45 MHz application circuit Table 6: C1 C2 C5 C6 C7 C8 C9 C10 C12 C14
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Demoboard application component list Value 51 pF 220 pF 100 nF r 10 % 5 pF to 30 pF 1 nF 10.0 pF 100 nF r 10 % 10 PF 2.2 PF r 10 % 100 nF r 10 % Type NPO ceramic NPO ceramic monolithic ceramic trim cap ceramic NPO ceramic monolithic ceramic tantalum (minimum) [1] tantalum monolithic ceramic
(c) Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Component
Objective data sheet
Rev. 01 -- 1 November 2004
7 of 16
Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
Demoboard application component list ...continued Value 10 pF 100 nF r 10 % 100 nF r 10 % 390 pF r 10 % 100 nF r 10 % 100 nF r 10 % 100 nF r 10 % 2.2 PF 330 PH 330 nH 1.2 PH nominal 44.545 MHz not used in application board (see list item 8 on page 9) 8.2 k r 5 % 10 k r 5 % 2.4 k r 5 % 3.3 k r 5 % 11 k r 5 % Type NPO ceramic monolithic ceramic monolithic ceramic monolithic ceramic monolithic ceramic monolithic ceramic monolithic ceramic tantalum ceramic filter Murata CFUCF455KB4X-R0 or equivalent ceramic filter Murata CFUCF455KB4X-R0 or equivalent TOKO 836AN-0129Z TOKO A638AN-0158Z FSLM2520-12K crystal ICM4712701 -
Table 6: C15 C17 C18 C19 C21 C23 C26 C27 FLT1 FLT2 IFT1 L1 L2 X1 R5
Component
R10 R11 R17 R18 R19
[1]
1e W 4 1e W 4 1e W 4 1e W 4 1e W 4
carbon composition carbon composition carbon composition carbon composition carbon composition
This value can be reduced when a battery is the power source.
9397 750 14161
(c) Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Objective data sheet
Rev. 01 -- 1 November 2004
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Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
13. Test information
RF GENERATOR 45 MHz
SA58640 DEMOBOARD RSSI AUDIO
VCC (+3) DE-EMPHASIS FILTER DC VOLTMETER
C-MESSAGE
SCOPE
HP339A DISTORTION ANALYZER
002aab127
Fig 4. Application circuit test setup
The following list items 1 through 8 apply to Figure 4: 1. The C-message and de-emphasis filter combination has a peak gain of 10 for accurate measurements. Without the gain, the measurements may be affected by the noise of the scope and HP339A analyzer. The de-emphasis filter has a fixed 6 dB/Octave slope between 300 Hz and 3 kHz. 2. The ceramic filters can be 30 kHz SFG455A3s made by Murata which have 30 kHz IF bandwidth (they come in blue), or 16 kHz CFU455Ds, also made by Murata (they come in black). All specifications and testing are done with the wideband filter. 3. Set your RF generator at 45.000 MHz, use a 1 kHz modulation frequency and a 6 kHz deviation if you use 16 kHz filters, or 8 kHz if you use 30 kHz filters. 4. The measured typical sensitivity for 12 dB SINAD should be 0.45 PV or 114 dBm at the RF input. 5. The layout is very critical in the performance of the receiver. We highly recommend our demo board layout. 6. The smallest RSSI voltage (i.e., when no RF input is present and the input is terminated) is a measure of the quality of the layout and design. If the lowest RSSI voltage is 500 mV or higher, it means the receiver is in regenerative mode. In that case, the receiver sensitivity will be worse than expected. 7. All of the inductors, the quad tank, and their shield must be grounded. A 10 PF to 15 PF or higher value tantalum capacitor on the supply line is essential. A low frequency ESR screening test on this capacitor will ensure consistent good sensitivity in production. A 0.1 PF bypass capacitor on the supply pin, and grounded near the 44.545 MHz oscillator improves sensitivity by 2 dB to 3 dB. 8. R5 can be used to bias the oscillator transistor at a higher current for operation above 45 MHz. Recommended value is 22 k:, but should not be below 10 k:.
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Objective data sheet
Rev. 01 -- 1 November 2004
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Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
6 ICC (mA) 5 VCC = 7 V
002aab128
20 IF output power (dBm) 0
002aab130 RF = 45 MHz IF = 455 kHz
-20
-40 4 5V -60
(1) (2)
3 -55 -35 -15
5
25
45
65
85
105 125 t (C)
-80 -66
46
26
6
14 34 RF(3) input level (dBm)
(1) Fund product (2) 3rd order product (3) 50
X input
Fig 5. ICC vs. temperature and supply voltage
Fig 6. Mixer third order intercept and compression
5 (dB) -5 -15 -25
(1)
001aab131
1.9 (V) 85 C 27 C -40 C
002aab132
1.5
1.1 -35
(2)
-45
(3)
0.7
-55
(4)
-65 -125
-105
-85
-65
-45 -25 RFlevel (dBm)
0.3 -125
-105
-85
-65 -45 RFlevel (dBm)
VCC = 5 V; RF = 45 MHz; deviation = level = 117.6 mVRMS (1) Audio (2) AM rejection (3) THD + noise (4) Noise
rA5 kHz; audio
Fig 7. Sensitivity vs. RF level (+25 qC)
Fig 8. RSSI vs. RF level and temperature (VCC = 5 V)
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Objective data sheet
Rev. 01 -- 1 November 2004
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Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
300 mVRMS VCC = 7 V 250
002aab133
200 5V
150
100 -55 -35 -15
5
25
45
65
85
105 125 t (C)
Fig 9. Audio output vs. temperature and supply voltage
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(c) Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Objective data sheet
Rev. 01 -- 1 November 2004
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Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
14. Package outline
SSOP20: plastic shrink small outline package; 20 leads; body width 4.4 mm SOT266-1
D
E
A X
c y HE vM A
Z
20
11
Q A2 pin 1 index A1 (A 3) Lp L A
1
e bp
10
detail X wM
0
2.5 scale
5 mm
DIMENSIONS (mm are the original dimensions) UNIT mm A max. 1.5 A1 0.15 0 A2 1.4 1.2 A3 0.25 bp 0.32 0.20 c 0.20 0.13 D (1) 6.6 6.4 E (1) 4.5 4.3 e 0.65 HE 6.6 6.2 L 1 Lp 0.75 0.45 Q 0.65 0.45 v 0.2 w 0.13 y 0.1 Z (1) 0.48 0.18 10 o 0
o
Note 1. Plastic or metal protrusions of 0.20 mm maximum per side are not included. OUTLINE VERSION SOT266-1 REFERENCES IEC JEDEC MO-152 JEITA EUROPEAN PROJECTION
ISSUE DATE 99-12-27 03-02-19
Fig 10. Package outline SOT266-1 (SSOP20)
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Objective data sheet
Rev. 01 -- 1 November 2004
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Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
15. Abbreviations
Table 7: Acronym AC AM ESD FM IF LC LO RF RSSI SINAD THD XTAL Abbreviations Description Alternating Current Amplitude Modulation Electrostatic Discharge Frequency Modulator Intermediate Frequency Inductor-Capacitor Circuit Local Oscillator Radio Frequency Received Signal Strength Indicator Signal, Noise And Distortion Total Harmonic Distortion Crystal
9397 750 14161
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Objective data sheet
Rev. 01 -- 1 November 2004
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Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
16. Revision history
Table 8: Revision history Release date 200410xx Data sheet status Objective Change notice Doc. number 9397 750 14161 Supersedes Document ID SA58640_1
9397 750 14161
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Objective data sheet
Rev. 01 -- 1 November 2004
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SA58640
Low-voltage mixer FM IF system
17. Data sheet status
Level I II Data sheet status [1] Objective data Preliminary data Product status [2] [3] Development Qualification Definition This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN).
III
Product data
Production
[1] [2] [3]
Please consult the most recently issued data sheet before initiating or completing a design. The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
18. Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
19. Disclaimers
Life support -- These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes in the products - including circuits, standard cells, and/or software - described or contained herein in order to improve design and/or performance. When the product is in full production (status `Production'), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
20. Contact information
For additional information, please visit: http://www.semiconductors.philips.com For sales office addresses, send an email to: sales.addresses@www.semiconductors.philips.com
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(c) Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Objective data sheet
Rev. 01 -- 1 November 2004
15 of 16
Philips Semiconductors
SA58640
Low-voltage mixer FM IF system
21. Contents
1 2 3 4 5 6 7 7.1 7.2 8 9 10 11 12 13 14 15 16 17 18 19 20 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Ordering information . . . . . . . . . . . . . . . . . . . . . 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Pinning information . . . . . . . . . . . . . . . . . . . . . . 2 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3 Functional description . . . . . . . . . . . . . . . . . . . 3 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 5 Static characteristics. . . . . . . . . . . . . . . . . . . . . 5 Dynamic characteristics . . . . . . . . . . . . . . . . . . 6 Application information. . . . . . . . . . . . . . . . . . . 7 Test information . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 12 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . 14 Data sheet status . . . . . . . . . . . . . . . . . . . . . . . 15 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Contact information . . . . . . . . . . . . . . . . . . . . 15
(c) Koninklijke Philips Electronics N.V. 2004
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Date of release: 1 November 2004 Document number: 9397 750 14161
Published in The U.S.A.

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