Philips Semiconductors

Product specification

SA615

High performance low power mixer FM IF system

1997 Nov 07

853-1402 18665

DESCRIPTION

The SA615 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), and voltage regulator. The
SA615 combines the functions of Signetics' SA602 and SA604A, but
features a higher mixer input intercept point, higher IF bandwidth
(25MHz) and temperature compensated RSSI and limiters
permitting higher performance application. The SA615 is available in
20-lead dual-in-line plastic, 20-lead SOL (surface-mounted miniature
package) and 20-lead SSOP (shrink small outline package).

The SA605 and SA615 are functionally the same device types. The
difference between the two devices lies in the guaranteed
specifications. The SA615 has a higher I

, lower input third order

intercept point, lower conversion mixer gain, lower limiter gain, lower
AM rejection, lower SINAD, higher THD, and higher RSSI error than
the SA615. Both the SA605 and SA615 devices will meet the EIA
specifications for AMPS and TACS cellular radio applications.

For additional technical information please refer to application notes
AN1994, 1995 and 1996, which include example application
diagrams, a complete overview of the product, and artwork for
reference.

FEATURES

Low power consumption: 5.7mA 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

Two audio outputs muted and unmuted

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 with RF
at 45MHz and IF at 455kHz

SA615 meets cellular radio specifications

ESD hardened

PIN CONFIGURATION

LIMITER DECOUPLING

IF AMP DECOUPLING

QUADRATURE IN

UNMUTED AUDIO OUT

MUTED AUDIO OUT

RF BYPASS

XTAL OSC

MUTE

RSSIOUT

MIXER OUT

IF AMP IN

IF AMP OUT

GND

LIMITER IN

LIMITER OUT

VCC

N, D and DK Packages

NOTE:

See back page for package dimensions

SR00341

Figure 1. Pin Configuration

APPLICATIONS

Cellular radio FM IF

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

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

20-Pin Plastic Dual In-Line Package (DIP)

40 to +85

SA615N

SOT146-1

20-Pin Plastic Small Outline Large (SOL) package

40 to +85

SA615D

SOT108-1

20-Pin Plastic Shrink Small Outline Package (SSOP)

40 to +85

SA615DK

SOT266-1

Philips Semiconductors

Product specification

SA615

High performance low power mixer FM IF system

1997 Nov 07

BLOCK DIAGRAM

RSSI

OSCILLATOR

IF
AMP

LIMITER

SR00342

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 SA615

40 to +85

Thermal impedance

D package
N package
SSOP package

90
75

117

C/W

DC ELECTRICAL CHARACTERISTICS

= +6V, T

= 25

C; unless otherwise stated.

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

SA615

UNITS

MIN

TYP

MAX

Power supply voltage range

4.5

8.0

DC current drain

5.7

7.4

Mute switch input threshold (ON)

1.7

(OFF)

1.0

Philips Semiconductors

Product specification

SA615

High performance low power mixer FM IF system

1997 Nov 07

AC ELECTRICAL CHARACTERISTICS

= 25

C; V

= +6V, unless otherwise stated. RF frequency = 45MHz + 14.5dBV RF input stepup; 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

SA615

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 = 45.00; f2 = 45.06MHz

-12

dBm

Conversion power gain

Matched 14.5dBV step-up

8.0

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

1.50

IF section

IF amp gain

source

39.7

Limiter gain

source

62.5

Input limiting -3dB, R

= 5.1k

Test at Pin 18

-109

dBm

AM rejection

80% AM 1kHz

Audio level, R

= 100k

15nF de-emphasis

150

260

Unmuted audio level, R

= 100k

150pF de-emphasis

530

SINAD sensitivity

RF level -118dB

THD

Total harmonic distortion

-30

-42

S/N

Signal-to-noise ratio

No modulation for noise

IF RSSI output, R

= 100k

IF level = -118dBm

160

800

IF level = -68dBm

1.7

2.5

3.3

IF level = -18dBm

3.6

4.8

5.8

RSSI range

= 100k

Pin 16

RSSI accuracy

= 100k

Pin 16

IF input impedance

1.40

1.6

IF output impedance

0.85

1.0

Limiter intput impedance

1.40

1.6

Unmuted audio output resistance

Muted audio output resistance

RF/IF section (int LO)

Unmuted audio level

4.5V = V

, RF level = -27dBm

450

System RSSI output

4.5V = V

, RF level = -27dBm

4.3

NOTE:

1. The generator source impedance is 50

, but the SA615 input impedance at Pin 18 is 1500

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

that enters the SA615 input (Pin 8) which is about 21dB less than the "available power" at the generator.

Philips Semiconductors

Product specification

SA615

High performance low power mixer FM IF system

1997 Nov 07

CIRCUIT DESCRIPTION

The SA615 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

SA615

High performance low power mixer FM IF system

1997 Nov 07

RSSI

OSCILLATOR

LIMITER

IF AMP

MINICIRCUIT ZSC21B

MUTE

RSSI

OUTPUT

AUDIO UNMUTED

AUDIO

C14

IFT1

C13

C12

C11

C10

R10

R11

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

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

6.8

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 TOKO 292CNST1038Z

Ceramic Filter Murata SFG455A3 or equiv

100nF +10% Monolithic Ceramic

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

EMITTER

BASE

1.3k

51.7

71.5

96.5

32.8

51.5

47pF NPO Ceramic
180pF NPO Ceramic

C26

390pF +10% Monolithic Ceramic

455kHz 270

H TOKO #303LN-1129

300nH TOKO #5CB-1055Z

C26

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

SR00343

Figure 3. SA615 45MHz Test Circuit (Relays as shown)

Philips Semiconductors

Product specification

SA615

High performance low power mixer FM IF system

1997 Nov 07

RSSI

OSCILLATOR

LIMITER

IF AMP

MUTE

RSSI

OUTPUT

AUDIO UNMUTED

AUDIO

C14

IFT1

C13

C12

C11

C10

R10

R11

VCC

C18

C15

C17

FLT2

C23

C21

R17

5.1k

FLT1

C25

QUAD

DETECTOR

MUTE

SWITCH

MIXER

700

Application Component List

45MHz

INPUT

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

6.8

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 TOKO 292CNST1038Z

Ceramic Filter Murata SFG455A3 or equiv

100nF +10% Monolithic Ceramic

C1
C2
C5
C6
C7
C8
C9

C10

C11

C12
C13
C14
C15
C17
C18

47pF NPO Ceramic
180pF NPO Ceramic

C26

390pF +10% Monolithic Ceramic

455kHz 270

H TOKO #303LN-1129

300nH TOKO #5CB-1055Z

C26

NE/SA615N

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

SR00344

Figure 4. SA615 45MHz Application Circuit

Philips Semiconductors

Product specification

SA615

High performance low power mixer FM IF system

1997 Nov 07

RF GENERATOR

SA615 DEM0BOARD

RSSI

AUDIO

DATA

CMESSAGE

HP339A DISTORTION

ANALYZER

SCOPE

DC VOLTMETER

(+6)

45MHz

SR00345

Figure 5. SA615 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 1015

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 23dB.

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

SA615

High performance low power mixer FM IF system

1997 Nov 07

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 134). 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.

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, 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.

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

Date of release: 05-98

Document order number:

9397 750 03916

Philips

Semiconductors

Data sheet
status

Objective
specification

Preliminary
specification

Product
specification

Product
status

Development

Qualification

Production

Definition

[1]

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

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

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.

Data sheet status

[1]

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

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: NE615

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: NE615