Philips Semiconductors

Product specification

SA627

High performance low power mixer FM IF system
with high-speed RSSI

1997 Nov 07

853-1649 18664

DESCRIPTION

The SA627 has faster RSSI rise and fall times. The SA627 is a high
performance monolithic low-power FM IF system incorporating a
mixer/oscillator, two limiting intermediate frequency amplifiers,
quadrature detector, muting, logarithmic received signal strength
indicator (RSSI) with fast rise and fall time, voltage regulator and
frequency check/limiter out (). The SA627 also has an extra limiter
output. This signal is buffered from the output of the limiter and
provides a negative () limiter output. This can be used to provide a
frequency check function. The SA627 is available in 20-lead SOL
(surface-mounted miniature package) and 20-lead SSOP (shrink
small outline package).

FEATURES

Fast RSSI rise and fall times

Low power consumption: 5.8mA typical at 6V

Mixer input to >500MHz

Mixer conversion power gain of 13dB at 45MHz

Mixer noise figure of 4.6dB at 45MHz

XTAL oscillator effective to 150MHz (L.C. oscillator to 1GHz local
oscillator can be injected)

102dB of IF Amp/Limiter gain

25MHz limiter small signal bandwidth

Temperature compensated logarithmic Received Signal Strength
Indicator (RSSI) with a dynamic range in excess of 90dB

Audio output - mutable

Low external component count; suitable for crystal/ceramic/LC
filters

Excellent sensitivity: 0.22

V into 50

matching network for 12dB

SINAD (Signal to Noise and Distortion ratio) for 1kHz tone, 8kHz
deviation with RF at 45MHz and IF at 455kHz

SA627 meets cellular radio specifications

ESD hardened

PIN CONFIGURATION

RFIN

RF BYPASS

XTAL OSC

XTAL OSC 4

MUTEIN

RSSIOUT

20 MIXER OUT

18 IF AMP IN

16 IF AMP OUT

15 GND

14 LIMITER IN

11 LIMITER OUT (+)

VCC

D and DK Packages

MUTED AUDIO OUT 8

QUADRATURE IN

IF AMP DECOUPLING

LIMITER DECOUPLING

FREQ CHECK/ LIM OUT ()

SR00481

Figure 1. Pin Configuration

APPLICATIONS

Digital cellular base stations

High performance communications receivers

Single conversion VHF/UHF receivers

SCA receivers

RF level meter

Spectrum analyzer

Instrumentation

FSK and ASK data receivers

Log amps

Wideband low current amplification

Digital cordless telephones

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

20-Pin Plastic Small Outline Large (SOL) package (Surface-mount)

-40 to +85

SA627D

SOT163-1

20-Pin Plastic Shrink Small Outline Package (SSOP) (Surface-mount)

-40 to +85

SA627DK

SOT266-1

Philips Semiconductors

Product specification

SA627

High performance low power mixer FM IF system
with high-speed RSSI

1997 Nov 07

BLOCK DIAGRAM

RSSI

OSCILLATOR

LIMITER

IF AMP

QUAD

DETECTOR

MUTE

SWITCH

MIXER

700

SR00482

Figure 2. Block Diagram

ABSOLUTE MAXIMUM RATINGS

SYMBOL

PARAMETER

RATING

UNITS

Single supply voltage

STG

Storage temperature range

-65 to +150

Operating ambient temperature range SA627

-40 to +85

Thermal impedance

D package

C/W

DK package

117

C/W

DC ELECTRICAL CHARACTERISTICS

= +6V, T

= 25

C; unless otherwise stated.

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

SA627

UNITS

MIN

TYP

MAX

Power supply voltage range

4.5

8.0

DC current drain

4.55

5.8

6.75

Mute switch input threshold

(ON)

1.7

(OFF)

1.0

Philips Semiconductors

Product specification

SA627

High performance low power mixer FM IF system
with high-speed RSSI

1997 Nov 07

AC ELECTRICAL CHARACTERISTICS

= 25

C; V

= +6V, unless otherwise stated. RF frequency = 45MHz + 14.5dBV RF input step-up; IF frequency = 455kHz; R17 = 5.1k; RF

level = -45dBm; FM modulation = 1kHz with

8kHz peak deviation. Audio output with C-message weighted filter and de-emphasis capacitor.

Test circuit Figure 3. The parameters listed below are tested using automatic test equipment to assure consistent electrical characterristics.
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.

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

SA627

UNITS

MIN

TYP

MAX

Mixer/Osc section (ext LO = 300mV)

Input signal frequency

500

MHz

OSC

Crystal oscillator frequency

150

MHz

Noise figure at 45MHz

5.0

Third-order input intercept point

f1 = 45.0; f2 = 45.06MHz

-10

dBm

Conversion power gain

Matched 14.5dBV step-up

source

-1.7

RF input resistance

Single-ended input

3.0

4.7

RF input capacitance

3.5

4.0

Mixer output resistance

(Pin 20)

1.25

1.5

IF section

IF amp gain

source

39.7

Limiter gain

source

62.5

Input limiting -3dB, R

= 5.1k

Test at Pin 18

-113

dBm

AM rejection

80% AM 1kHz

Audio level, R

= 100k

15nF de-emphasis

150

260

RMS

SINAD sensitivity

RF level -118dB

THD

Total harmonic distortion

-34

-42

S/N

Signal-to-noise ratio

No modulation for noise

IF RSSI output, R

= 100k

IF level = -118dBm

160

650

IF level = -68dBm

1.9

2.5

3.1

IF level = -18dBm

4.0

4.8

5.6

IF frequency = 455kHz

RF level = -56dBm

1.2

IF RSSI output rise time

RF level = -28dBm

1.2

(10kHz pulse, no 455kHz filter)

IF frequency = 10.7MHz

(no RSSI bypass capacitor)

RF level = -56dBm

1.2

RF level = -28dBm

1.1

IF frequency = 455kHz

RF level = -56dBm

2.1

IF RSSI output fall time

RF level = -28dBm

7.6

(10kHz pulse, no 455kHz filter)

IF frequency = 10.7MHz

(no RSSI bypass capacitor)

RF level = -56dBm

2.0

RF level = -28dBm

7.3

RSSI range

= 100k

Pin 16

RSSI accuracy

= 100k

Pin 16

+1.5

IF input impedance

1.40

1.6

IF output impedance

0.85

1.0

Limiter input impedance

1.40

1.6

Limiter output impedance

Pin 10 or 11

300

Limiter output level

Pin 10 or 11 with no load
3k

load (min)

280
250

RMS

Philips Semiconductors

Product specification

SA627

High performance low power mixer FM IF system
with high-speed RSSI

1997 Nov 07

AC ELECTRICAL CHARACTERISTICS

(Continued)

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

SA627

UNITS

MIN

TYP

MAX

IF section (continued)

Muted audio output resistance

RF/IF section (int LO)

System RSSI output

4.5V = V

, RF level = -27dBm

4.3

NOTE:

1. The generator source impedance is 50

, but the SA627 input impedance at Pin 18 is 1500

. As a result, IF level refers to the actual signal

that enters the SA627 input (Pin 8) which is about 21dB less than the "available power" at the generator.

CIRCUIT DESCRIPTION

The SA627 is an IF signal processing system suitable for second IF
or single conversion systems with input frequency as high as 1GHz.
The bandwidth of the IF amplifier is about 40MHz, with 39.7dB(v) of
gain from a 50

source. The bandwidth of the limiter is about

28MHz with about 62.5dB(v) of gain from a 50

source. However,

the gain/bandwidth distribution is optimized for 455kHz, 1.5k

source applications. The overall system is well-suited to battery
operation as well as high performance 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 5dB, conversion gain of
13dB, and input third-order intercept of -10dBm. The oscillator will
operate in excess of 1GHz in L/C tank configurations. Hartley or
Colpitts circuits can be used up to 100MHz for xtal configurations.
Butler oscillators are recommended for xtal configurations up to
150MHz.

The output of the mixer is internally loaded with a 1.5k

resistor

permitting direct connection to a 455kHz ceramic filter. The input
resistance of the limiting IF amplifiers is also 1.5k

. With most

455kHz ceramic filters and many crystal filters, no impedance
matching network is necessary. To achieve optimum linearity of the
log signal strength indicator, there must be a 12dB(v) insertion loss
between the first and second IF stages. If the IF filter or interstage

network does not cause 12dB(v) insertion loss, a fixed or variable
resistor can be added between the first IF output (Pin 16) and the
interstage network.

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.

Overall, the IF section has a gain of 90dB. For operation at
intermediate frequencies greater than 455kHz, special care must be
given to layout, termination, and interstage loss to avoid instability.

The demodulated output of the quadrature detector is available at
two pins, one continuous and one with a mute switch. Signal
attenuation with the mute activated is greater than 60dB. The mute
input is very high impedance and is compatible with CMOS or TTL
levels.

A log signal strength completes the circuitry. The output range is
greater than 90dB and is temperature compensated. This log signal
strength indicator exceeds the criteria for AMPs or TACs cellular
telephone.

NOTE: dB(v) = 20log V

OUT

Philips Semiconductors

Product specification

SA627

High performance low power mixer FM IF system
with high-speed RSSI

1997 Nov 07

RSSI

OSCILLATOR

LIMITER

IF AMP

MINICIRCUIT ZSC21B

MUTE

RSSI

OUTPUT

AUDIO

FREQ CHK/

LIMITER OUT ()

C14

IFT1

C13

C12

C11

C10

R10

R12

30.5

SW3

SW4

SW1

VCC

EXT.
LOC
OSC

44.545

45MHZ

SW2

51.1

178

39.2

"C" WEIGHTED

AUDIO

MEASUREMENT

CIRCUIT

45.06

MHZ

50.5

2430

3880

96.5

32.6

71.5

C24

C22

C20

C19

C18

C15

C16

C17

FLT2

SW7

SW6

SW5

SW8

SW9

C23

C21

R17

5.1k

FLT1

25dB,

1500/50

PAD

10dB,

50/50

PAD

29dB,

929/50

PAD

10.6dB,

50/50

PAD

36dB,

156k/50

PAD

100pF NPO Ceramic
390pF NPO Ceramic

22pF NPO Ceramic
1nF Ceramic
10.0pF NPO Ceramic

10pF NPO Ceramic

100nF +10% Monolithic Ceramic

100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic

15nF +10% Ceramic

100nF +10% Monolithic Ceramic

0.1

F +10% Monolithic Ceramic

100nF +10% Monolithic Ceramic

F Tantalum (minimum)

C21
C23
C25

Flt 1
Flt 2

IFT 1

L1
L2

R17
R10

R11

100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic

100k +1% 1/4W Metal Film (optional)

5.1k +5% 1/4W Carbon Composition

100k +1% 1/4W Metal Film

44.545MHz Crystal ICM4712701

0.8

H nominal

Toko 292CNST1038Z

455kHz (Ce = 180pF) Toko RMC2A6597H

Ceramic Filter Murata SFG455A3 or equiv

100nF +10% Monolithic Ceramic

147160nH Coilcraft UNI10/14204J08S

C1
C2
C5
C6
C7
C8
C9

C10

C11

C12
C13
C14
C15
C17
C18

QUAD

DETECTOR

MUTE

SWITCH

MIXER

700

Automatic Test Circuit Component List

1.3k

51.7

71.5

96.5

32.8

51.5

R12

+5% 1/4W Metal Film (optional)

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

SR00483

Figure 3. SA627 45MHz Test Circuit (Relays as shown)

Philips Semiconductors

Product specification

SA627

High performance low power mixer FM IF system
with high-speed RSSI

1997 Nov 07

RSSI

OSCILLATOR

LIMITER

IF AMP

MUTE

RSSI

OUTPUT

AUDIO

FREQ CHECK/

LIMITER OUT ()

C14

IFT1

C12

C11

C10

R10

VCC

C18

C15

C17

FLT2

C23

C21

R17

5.1k

FLT1

100pF NPO Ceramic
390pF NPO Ceramic

22pF NPO Ceramic
1nF Ceramic
10.0pF NPO Ceramic

10pF NPO Ceramic

100nF +10% Monolithic Ceramic

100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic

15nF +10% Ceramic

100nF +10% Monolithic Ceramic

150pF +2% N1500 Ceramic

100nF +10% Monolithic Ceramic

F Tantalum (minimum) *

C21
C23
C25

Flt 1
Flt 2

IFT 1

L1
L2

R17

R10

R11

100nF +10% Monolithic Ceramic
100nF +10% Monolithic Ceramic

100k +1% 1/4W Metal Film (optional)

Not Used in Application Board (see Note 8)

5.1k +5% 1/4W Carbon Composition

100k +1% 1/4W Metal Film

44.545MHz Crystal ICM4712701

0.8

H nominal

Toko 292CNST1038Z

455kHz (Ce = 180pF) Toko RMC2A6597H

Ceramic Filter Murata SFG455A3 or equiv

100nF +10% Monolithic Ceramic

147160nH Coilcraft UNI10/14204J08S

C1
C2
C5
C6
C7
C8
C9

C10

C11

C12
C13
C14
C15
C17
C18

C25

QUAD

DETECTOR

MUTE

SWITCH

MIXER

700

Application Component List

45MHz

INPUT

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

SR00484

Figure 4. SA627 45MHz Application Circuit

Philips Semiconductors

Product specification

SA627

High performance low power mixer FM IF system
with high-speed RSSI

1997 Nov 07

RF GENERATOR

NE627 DEMO BOARD

RSSI

AUDIO

DATA

CMESSAGE

HP339A DISTORTION

ANALYZER

SCOPE

DC VOLTMETER

(+6)

45MHz

SR00485

Figure 5. SA627 Application Circuit Test Set Up

NOTES:
1. C-message: The C-message filter has a peak gain of 100 for accurate measurements. Without the gain, the measurements may be

affected by the noise of the scope and HP339 analyzer.

2. Ceramic filters: The ceramic filters can be 30kHz SFG455A3s made by Murata which have 30kHz IF bandwidth (they come in blue), or

16kHz CFU455Ds, also made by Murata (they come in black). All of our specifications and testing are done with the more wideband filter.

3. RF generator: Set your RF generator at 45.000MHz, use a 1kHz modulation frequency and a 6kHz deviation if you use 16kHz filters, or

8kHz if you use 30kHz filters.

4. Sensitivity: The measured typical sensitivity for 12dB SINAD should be 0.22

V or -120dBm at the RF input.

5. Layout: The layout is very critical in the performance of the receiver. We highly recommend our demo board layout.
6. RSSI: 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 250mV or higher, it means the receiver is in regenerative mode. In that case, the receiver sensitivity
will be worse than expected.

7. Supply bypass and shielding: All of the inductors, the quad tank, and their shield must be grounded. A 10-15

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, and grounded near the 44.545MHz oscillator improves sensitivity by 2-3dB.

8. R5 can be used to bias the oscillator transistor at a higher current for operation above 45MHz. Recommended value is 22k

, but should not

be below 10k

Philips Semiconductors

Product specification

SA627

High performance low power mixer FM IF system
with high-speed RSSI

1997 Nov 07

20

40

60

80

100

130

110

90

70

50

30

10

AUDIO REF = 174mV

RMS

AM (80%)

NOISE

RSSI

(Volts)

RELA

TIVE

AUDIO OUTPUT (dB)

RF INPUT LEVEL (dBm)

RF = 45MHz

IF = 455kHz

= 6V

RSSI

(Volts)

THD NOISE

SR00486

Figure 6. SA627 Application Board at 25

RFINP28dBm

RFINP38dBm

RFINP56dBm

1.70

1.65

1.60

1.55

1.50

1.45

1.40

1.35

1.30

1.25

1.20

1.15

1.10

40

30

20

10

TEMPERATURE (

RSSI RISE TIME ( s)

SR00487

Figure 7. SA627 Rise Time 455kHz IF Frequency

Philips Semiconductors

Product specification

SA627

High performance low power mixer FM IF system
with high-speed RSSI

1997 Nov 07

RFINP28dBm

RFINP38dBm

RFINP56dBm

8.0

7.5

7.0

6.5

6.0

5.5

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

40

30

20

10

TEMPERATURE (

RSSI

ALL

TIME ( s)

SR00488

Figure 8. SA627 Fall Time 455kHz IF Frequency

RFINP28dBm
RFINP38dBm

RFINP56dBm

1.65

1.60

1.55

1.50

1.45

1.40

1.35

1.30

1.25

1.20

1.15

1.10

40

30

20

10

TEMPERATURE (

RSSI RISE TIME ( s)

1.00

SR00489

Figure 9. SA627 Rise Time 10.7MHz IF Frequency

High performance low power mixer FM IF system
with high-speed RSSI

Philips Semiconductors

Product specification

SA627

1997 Nov 07

Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. 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. Applications that are described herein for any of these products are for illustrative purposes
only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing
or modification.

LIFE SUPPORT APPLICATIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.

This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.

Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 940883409
Telephone 800-234-7381

DEFINITIONS

Data Sheet Identification

Product Status

Definition

Objective Specification

Preliminary Specification

Product Specification

Formative or in Design

Preproduction Product

Full Production

This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.

This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.

Philips

Semiconductors

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Document Outline

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Document Outline

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