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.

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 package.

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

Crystal 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.

Applications

Cordless phones.

SA58640

Low-voltage mixer FM IF system

Rev. 01 -- 6 April 2005

Product data sheet

9397 750 14161

Product data sheet

Rev. 01 -- 6 April 2005

2 of 15

Philips Semiconductors

SA58640

Low-voltage mixer FM IF system

Ordering information

Block diagram

Pinning information

7.1 Pinning

Table 1:

Ordering information

Type number

Package

Name

Description

Version

SA58640DK

SSOP20

plastic shrink small outline package; 20 leads; body width 4.4 mm

SOT266-1

Fig 1.

Block diagram

002aab125

RSSI

REG

OSCILLATOR

limiter

mixer

quad

audio

IF amp

RF_IN_P

OSCOUT

RSSI_OUT

SA58640

AUDIO_FB

RSSI_FB

RF_IN_N_DEC

MIXER_OUT

IF_AMP_DEC

IF_AMP_IN

IF_AMP_DEC

IF_AMP_OUT

GND

LIM_IN

LIM_DEC

LIM_OUT

OSCIN

AUDIO_OUT

QUAD_IN

Fig 2.

Pin configuration

SA58640DK

RF_IN_P

MIXER_OUT

RF_IN_N

DEC

IF_AMP_DEC

OSCOUT

IF_AMP_IN

OSCIN

IF_AMP_DEC

RSSI_OUT

IF_AMP_OUT

GND

AUDIO_FB

LIM_IN

AUDIO_OUT

LIM_DEC

RSSI_FB

LIM_DEC

QUAD_IN

LIM_OUT

002aab134

9397 750 14161

Product data sheet

Rev. 01 -- 6 April 2005

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Philips Semiconductors

SA58640

Low-voltage mixer FM IF system

7.2 Pin description

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 crystal 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)

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

Table 2:

Pin description

Symbol

Pin

Description

RF_IN_P

positive RF mixer input

RF_IN_N_DEC

negative RF mixer input, decoupling

OSCOUT

oscillator output (emitter)

OSCIN

oscillator input (base)

RSSI_OUT

RSSI amplifier output

positive supply

AUDIO_FB

audio amplifier negative input, feedback

AUDIO_OUT

audio amplifier output

RSSI_FB

RSSI amplifier negative input, feedback

QUAD_IN

quadrature detector input

LIM_OUT

limiter amplifier output

LIM_DEC

limiter decoupling

LIM_DEC

limiter decoupling

LIM_IN

limiter amplifier input

GND

ground

IF_AMP_OUT

IF amplifier output

IF_AMP_DEC

IF amplifier decoupling

IF_AMP_IN

IF amplifier input

IF_AMP_DEC

IF amplifier decoupling

MIXER_OUT

mixer output

dB(V) = 20log V

9397 750 14161

Product data sheet

Rev. 01 -- 6 April 2005

4 of 15

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 90

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

Product data sheet

Rev. 01 -- 6 April 2005

5 of 15

Philips Semiconductors

SA58640

Low-voltage mixer FM IF system

Limiting values

10. Static characteristics

[1]

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 =

45 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.

Table 3:

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol

Parameter

Conditions

Min

Max

Unit

single supply voltage

stg

storage temperature range

150

amb

operating ambient
temperature range

thermal impedance

117

K/W

Table 4:

Static characteristics

amb

= 25

C; V

= +5 V, unless otherwise stated.

[1]

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

power supply
voltage range

4.5

6.0

DC current drain

5.0

6.0

9397 750 14161

Product data sheet

Rev. 01 -- 6 April 2005

6 of 15

Philips Semiconductors

SA58640

Low-voltage mixer FM IF system

11. Dynamic characteristics

[1]

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 IF amplifier input (pin 18) which is about 21 dB less than the `available power' at the generator.

Table 5:

Dynamic characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Mixer/oscillator section (external LO = 220 mV

RMS

)

input frequency

100

MHz

osc

crystal oscillator
frequency

100

MHz

noise figure at
45 MHz

7.0

third-order input
intercept point (50

source)

f1 = 45.0; f2 = 45.06 MHz
Input RF level =

52 dBm

dBm

G(conv)

conversion power gain matched 14.5 dBV step-up

source

+2.5

i(RF)

RF input resistance

single-ended input

i(RF)

RF input capacitance

3.0

4.0

o(mix)

mixer output
resistance

measured on pin 20

1.25

1.5

IF section

a(IF)

IF amp gain

source

limiter gain

source

AM rejection

30 % AM 1 kHz

audio level

gain of two

120

SINAD sensitivity

IF level =

110 dBm

THD

total harmonic
distortion

S/N

signal-to-noise ratio

no modulation for noise

IF RSSI output,
R9 = 2 k

[1]

IF level =

110 dBm

0.5

1.0

IF level =

50 dBm

1.7

2.4

RSSI range

i(IF)

IF input impedance

measured on pin 18

1.3

1.5

o(IF)

IF output impedance

measured on pin 16

0.3

i(lim)

limiter input
impedance

measured on pin 14

1.3

1.5

o(lim)

limiter output
impedance

measured on pin 11

0.3

o(lim)(rms)

limiter output voltage

measured on pin 11

130

RF/IF section (internal LO)

system SINAD
sensitivity

RF level =

110 dBm

9397 750 14161

Product data sheet

Rev. 01 -- 6 April 2005

7 of 15

Philips Semiconductors

SA58640

Low-voltage mixer FM IF system

12. Application information

Fig 3.

45 MHz application circuit

002aab126

FLT1

C23

C21

C18

C17

C26

FLT2

R17

2.4 k

R18
3.3 k

C15

IFT1

audio

RSSI

output

C14

R19
11 k

R10
10 k

C19
390 pF

C27
2.2

C12

R11

10 k

C10

45 MHz

input

SA58640

Table 6:

Demo board application component list

Component

Value

Type

51 pF

NPO ceramic

220 pF

NPO ceramic

100 nF

10 %

monolithic ceramic

5 pF to 30 pF

trim cap

1 nF

ceramic

10.0 pF

NPO ceramic

100 nF

10 %

monolithic ceramic

C10

tantalum (minimum)

[1]

C12

2.2

10 %

tantalum

C14

100 nF

10 %

monolithic ceramic

C15

10 pF

NPO ceramic

C17

100 nF

10 %

monolithic ceramic

C18

100 nF

10 %

monolithic ceramic

C19

390 pF

10 %

monolithic ceramic

9397 750 14161

Product data sheet

Rev. 01 -- 6 April 2005

8 of 15

Philips Semiconductors

SA58640

Low-voltage mixer FM IF system

[1]

This value can be reduced when a battery is the power source.

13. Test information

The following list items

through

apply to

Figure 4

C21

100 nF

10 %

monolithic ceramic

C23

100 nF

10 %

monolithic ceramic

C26

100 nF

10 %

monolithic ceramic

C27

2.2

tantalum

FLT1

ceramic filter Murata CFUCF455KB4X-R0 or
equivalent

FLT2

ceramic filter Murata CFUCF455KB4X-R0 or
equivalent

IFT1

330

TOKO 836AN-0129Z

330 nH

TOKO A638AN-0158Z

1.2

H nominal

FSLM2520-12K

44.545 MHz

crystal ICM4712701

not used in application
board (see list item

8 on

page 9

)

R10

8.2 k

5 %

W carbon composition

R11

10 k

5 %

W carbon composition

R17

2.4 k

5 %

W carbon composition

R18

3.3 k

5 %

W carbon composition

R19

11 k

5 %

W carbon composition

Table 6:

Demo board application component list

...continued

Component

Value

Type

Fig 4.

Application circuit test setup

SCOPE

SA58640 DEMOBOARD

RSSI

AUDIO

002aab127

RF GENERATOR

45 MHz

(+3)

DC VOLTMETER

HP339A DISTORTION

ANALYZER

CMESSAGE

DE-EMPHASIS

FILTER

9397 750 14161

Product data sheet

Rev. 01 -- 6 April 2005

9 of 15

Philips Semiconductors

SA58640

Low-voltage mixer FM IF system

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

V 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

F to

F 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

F bypass capacitor on the supply pin V

, 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

(1) Fund product

(2) 3rd order product

(3) 50

input

Fig 5.

as a function of temperature and supply

voltage

Fig 6.

Mixer third order intercept and compression

t (

002aab128

(mA)

125

105

= 7 V

5 V

(3)

input level (dBm)

002aab130

IF output

power

(dBm)

(1)

(2)

RF = 45 MHz
IF = 455 kHz

9397 750 14161

Product data sheet

Rev. 01 -- 6 April 2005

10 of 15

Philips Semiconductors

SA58640

Low-voltage mixer FM IF system

= 5 V; RF = 45 MHz; deviation =

5 kHz; audio

level = 117.6 mV

RMS

(1) Audio

(2) AM rejection

(3) THD + noise

(4) Noise

Fig 7.

Sensitivity as a function of RF level (+25

Fig 8.

RSSI as a function of RF level and temperature
(V

= 5 V)

level

(dBm)

125

105

001aab131

sensitivity

(dB)

(1)

(2)

(3)

(4)

level

(dBm)

125

105

002aab132

1.1

0.7

1.5

1.9

RSSI

(V)

0.3

Fig 9.

Audio output as a function of temperature and supply voltage

t (

002aab133

200

150

250

300

100

audio output

(mV

RMS

)

125

105

5 V

= 7 V

9397 750 14161

Product data sheet

Rev. 01 -- 6 April 2005

11 of 15

Philips Semiconductors

SA58640

Low-voltage mixer FM IF system

14. Package outline

Fig 10. Package outline SOT266-1 (SSOP20)

UNIT

(1)

REFERENCES

OUTLINE

VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC

JEDEC

JEITA

0.15

1.4
1.2

0.32
0.20

0.20
0.13

6.6
6.4

4.5
4.3

0.65

0.2

6.6
6.2

0.65
0.45

0.48
0.18

0.13

0.1

DIMENSIONS (mm are the original dimensions)

Note

1. Plastic or metal protrusions of 0.20 mm maximum per side are not included.

0.75
0.45

SOT266-1

MO-152

99-12-27
03-02-19

detail X

(A )

0.25

pin 1 index

2.5

5 mm

scale

SSOP20: plastic shrink small outline package; 20 leads; body width 4.4 mm

SOT266-1

max.

1.5

Philips Semiconductors

SA58640

Low-voltage mixer FM IF system

9397 750 14161

Product data sheet

Rev. 01 -- 6 April 2005

14 of 15

17. Data sheet status

[1]

Please consult the most recently issued data sheet before initiating or completing a design.

[2]

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.

[3]

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

Level

Data sheet status

[1]

Product status

[2] [3]

Definition

Objective data

Development

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.

Preliminary data

Qualification

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.

III

Product data

Production

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).

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: 6 April 2005

Document number: 9397 750 14161

Published in The U.S.A.

Philips Semiconductors

SA58640

Low-voltage mixer FM IF system

21. Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

General description . . . . . . . . . . . . . . . . . . . . . . 1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Ordering information . . . . . . . . . . . . . . . . . . . . . 2

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Pinning information . . . . . . . . . . . . . . . . . . . . . . 2

7.1

Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

7.2

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

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