SA615 [NXP]

High performance low power mixer FM IF system; 高性能，低功耗混频器FM IF系统


型号：	SA615
厂家：	NXP
描述：	High performance low power mixer FM IF system 高性能，低功耗混频器FM IF系统
文件：	总14页 (文件大小：162K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

INTEGRATED CIRCUITS

SA615

High performance low power mixer FM IF

system

Product specification

1997 Nov 07

Replaces data of 1992 Nov 03

IC17 Data Handbook

Philips

Semiconductors

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

DESCRIPTION

PIN CONFIGURATION

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).

N, D and DK Packages

20 MIXER OUT

RF BYPASS

XTAL OSC

IF AMP DECOUPLING

18 IF AMP IN

IF AMP DECOUPLING

MUTE

IF AMP OUT

GND

The SA605 and SA615 are functionally the same device types. The

difference between the two devices lies in the guaranteed

LIMITER IN

RSSI

OUT

specifications. The SA615 has a higher I , lower input third order

LIMITER DECOUPLING

MUTED AUDIO OUT

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.

UNMUTED AUDIO OUT

QUADRATURE IN

LIMITER OUT

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.

NOTE:

See back page for package dimensions

SR00341

Figure 1. Pin Configuration

FEATURES

APPLICATIONS

• Low power consumption: 5.7mA typical at 6V

• Cellular radio FM IF

• Mixer input to >500MHz

• High performance communications receivers

• Single conversion VHF/UHF receivers

• SCA receivers

• 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

• RF level meter

oscillator can be injected)

• Spectrum analyzer

• 102dB of IF Amp/Limiter gain

• Instrumentation

• 25MHz limiter small signal bandwidth

• FSK and ASK data receivers

• Log amps

• Temperature compensated logarithmic Received Signal Strength

Indicator (RSSI) with a dynamic range in excess of 90dB

• Wideband low current amplification

• Two audio outputs – muted and unmuted

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

filters

• Excellent sensitivity: 0.22µV into 50Ω 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

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

–40 to +85°C

ORDER CODE

SA615N

DWG #

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

20-Pin Plastic Small Outline Large (SOL) package

20-Pin Plastic Shrink Small Outline Package (SSOP)

SOT146-1

SOT108-1

SOT266-1

–40 to +85°C

SA615D

–40 to +85°C

SA615DK

1997 Nov 07

853-1402 18665

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

BLOCK DIAGRAM

AMP

LIMITER

RSSI

OSCILLATOR

SR00342

Figure 2. Block Diagram

ABSOLUTE MAXIMUM RATINGS

SYMBOL

PARAMETER

RATING

UNITS

Single supply voltage

Storage temperature range

Operating ambient temperature range SA615

STG

–65 to +150

–40 to +85

°C

Thermal impedance

D package

N package

°C/W

SSOP package

117

DC ELECTRICAL CHARACTERISTICS

= +6V, T = 25°C; unless otherwise stated.

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

SA615

TYP

UNITS

MAX

MIN

Power supply voltage range

DC current drain

4.5

8.0

7.4

5.7

Mute switch input threshold (ON)

(OFF)

1.7

1.0

1997 Nov 07

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

AC ELECTRICAL CHARACTERISTICS

T = 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

SA615

TYP

UNITS

MIN

MAX

Mixer/Osc section (ext LO = 300mV)

Input signal frequency

500

150

5.0

MHz

Crystal oscillator frequency

Noise figure at 45MHz

OSC

Third-order input intercept point

Conversion power gain

f1 = 45.00; f2 = 45.06MHz

Matched 14.5dBV step-up

50Ω source

-12

dBm

8.0

3.0

-1.7

4.7

RF input resistance

RF input capacitance

Mixer output resistance

Single-ended input

kΩ

3.5

4.0

(Pin 20)

1.25

1.50

kΩ

IF section

IF amp gain

Limiter gain

50Ω source

39.7

62.5

-109

50Ω source

Input limiting -3dB, R = 5.1k

Test at Pin 18

80% AM 1kHz

dBm

AM rejection

Audio level, R = 100k

15nF de-emphasis

150

260

Unmuted audio level, R = 100k

150pF de-emphasis

RF level -118dB

530

SINAD sensitivity

THD

S/N

Total harmonic distortion

-30

-42

Signal-to-noise ratio

No modulation for noise

IF level = -118dBm

IF level = -68dBm

IF RSSI output, R = 100kΩ

160

2.5

4.8

800

3.3

5.8

1.7

3.6

IF level = -18dBm

RSSI range

R = 100kΩ Pin 16

kΩ

RSSI accuracy

R = 100kΩ Pin 16

IF input impedance

1.40

0.85

1.40

1.6

1.0

1.6

IF output impedance

Limiter intput impedance

Unmuted audio output resistance

Muted audio output resistance

RF/IF section (int LO)

Unmuted audio level

System RSSI output

4.5V = V , RF level = -27dBm

450

4.3

4.5V = V , RF level = -27dBm

NOTE:

1. The generator source impedance is 50Ω, but the SA615 input impedance at Pin 18 is 1500Ω. 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.

1997 Nov 07

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

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.

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 50Ω source. The bandwidth of the limiter is about

28MHz with about 62.5dB(v) of gain from a 50Ω source. However,

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

source applications. The overall system is well-suited to battery

operation as well as high performance and high quality products of

all types.

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 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 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.

The output of the mixer is internally loaded with a 1.5kΩ resistor

permitting direct connection to a 455kHz ceramic filter. The input

resistance of the limiting IF amplifiers is also 1.5kΩ. 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

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 /V

OUT IN

1997 Nov 07

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

–25dB,

–10dB,

–29dB,

929/50^ΩPAD

–10.6dB,

50/50^ΩPAD

–36dB,

156k/50^ΩPAD

1500/50^ΩPAD 50/50^ΩPAD

51.5

C20

96.5

51.7

96.5

32.6

50.5

71.5

32.8

2430

C24

71.5

C22

1.3k

3880

R17

5.1k

C15

C19

C16

SW9

FLT1 SW8

C23

SW7

SW6

FLT2

SW5

C18

C21

C17

IF AMP

700

LIMITER

RSSI

MIXER

QUAD

DETECTOR

OSCILLATOR

MUTE

SWITCH

EMITTER

BASE

R10

R11

SW1

SW3

SW4

C10

C11

C12

C13

51.1

IFT1

SW2

C26

EXT.

LOC

OSC

30.5

”C” WEIGHTED

AUDIO

45MHZ

MEASUREMENT

CIRCUIT

C14

44.545

39.2

178

45.06

MHZ

MUTE

RSSI

OUTPUT

AUDIO UNMUTED

AUDIO

MINI–CIRCUIT ZSC2–1B

Automatic Test Circuit Component List

C1 47pF NPO Ceramic

C2 180pF NPO Ceramic

C21

C23

C25

C26

100nF +10% Monolithic Ceramic

390pF +10% Monolithic Ceramic

100nF +10% Monolithic Ceramic

C6 22pF NPO Ceramic

C7 1nF Ceramic

C8 10.0pF NPO Ceramic

Flt 1 Ceramic Filter Murata SFG455A3 or equiv

Flt 2 Ceramic Filter Murata SFG455A3 or equiv

IFT 1

455kHz 270µH TOKO #303LN-1129

300nH TOKO #5CB-1055Z

0.8µH TOKO 292CNS–T1038Z

C10

C11

C12

C13

C14

100nF +10% Monolithic Ceramic

6.8^µF Tantalum (minimum) *

100nF +10% Monolithic Ceramic

15nF +10% Ceramic

150pF +2% N1500 Ceramic

100nF +10% Monolithic Ceramic

X1 44.545MHz Crystal ICM4712701

R17

R10

R11

100k +1% 1/4W Metal Film

5.1k +5% 1/4W Carbon Composition

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

C15 10pF NPO Ceramic

C17

C18

100nF +10% Monolithic Ceramic

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

SR00343

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

1997 Nov 07

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

R17

5.1k

C15

FLT1

C23

FLT2

C18

C21

C17

IF AMP

700

LIMITER

RSSI

MIXER

QUAD

DETECTOR

OSCILLATOR

MUTE

SWITCH

R10

R11

C10

C25

C11

C12

C13

IFT1

45MHz

INPUT

C26

C14

MUTE

RSSI

OUTPUT

AUDIO UNMUTED

AUDIO

NE/SA615N

Application Component List

C1 47pF NPO Ceramic

C2 180pF NPO Ceramic

C21

C23

C25

C26

100nF +10% Monolithic Ceramic

390pF +10% Monolithic Ceramic

100nF +10% Monolithic Ceramic

C6 22pF NPO Ceramic

C7 1nF Ceramic

C8 10.0pF NPO Ceramic

Flt 1 Ceramic Filter Murata SFG455A3 or equiv

Flt 2 Ceramic Filter Murata SFG455A3 or equiv

IFT 1

455kHz 270µH TOKO #303LN-1129

300nH TOKO #5CB-1055Z

0.8µH TOKO 292CNS–T1038Z

C10

C11

C12

C13

C14

100nF +10% Monolithic Ceramic

6.8^µF Tantalum (minimum) *

100nF +10% Monolithic Ceramic

15nF +10% Ceramic

150pF +2% N1500 Ceramic

100nF +10% Monolithic Ceramic

X1 44.545MHz Crystal ICM4712701

R17

R10

R11

100k +1% 1/4W Metal Film

5.1k +5% 1/4W Carbon Composition

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

C15 10pF NPO Ceramic

C17

C18

100nF +10% Monolithic Ceramic

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

SR00344

Figure 4. SA615 45MHz Application Circuit

1997 Nov 07

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

RF GENERATOR

SA615 DEM0–BOARD

45MHz

RSSI

AUDIO

DATA

(+6)

C–MESSAGE

DC VOLTMETER

HP339A DISTORTION

ANALYZER

SCOPE

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 0.22µV 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 10–15µF 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 0.1µF 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 22kΩ, but should not

be below 10kΩ.

1997 Nov 07

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

RF = 45MHz

IF = 455kHz

= 6V

AUDIO REF = 174mV

RMS

RSSI

–20

–40

(Volts)

THD NOISE

AM (80%)

–60

–80

NOISE

RSSI

(Volts)

–100

–130

–110

–90

–70

–50

–30

–10

RF INPUT LEVEL (dBm)

SR00346

Figure 6. SA615 Application Board at 25°C

1997 Nov 07

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

DIP20: plastic dual in-line package; 20 leads (300 mil)

SOT146-1

1997 Nov 07

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

SO14: plastic small outline package; 14 leads; body width 3.9 mm

SOT108-1

1997 Nov 07

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

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

SOT266-1

1997 Nov 07

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

NOTES

1997 Nov 07

Philips Semiconductors

Product specification

High performance low power mixer FM IF system

SA615

Data sheet status

[1]

Data sheet

status

Product

status

Definition

Objective

specification

Development

This data sheet contains the design target or goal specifications for product development.

Specification may change in any manner without notice.

Preliminary

specification

Qualification

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.

Product

specification

Production

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.

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

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.

Righttomakechanges—PhilipsSemiconductorsreservestherighttomakechanges, withoutnotice, intheproducts, includingcircuits,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 94088–3409

Telephone 800-234-7381

Date of release: 05-98

Document order number:

9397 750 03916

Philips

Semiconductors

1997 Nov 07

SA615 [NXP]

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