Philips sa626 DATASHEETS

INTEGRATED CIRCUITS

SA626

Low voltage high performance mixer FM IF system with high-speed RSSI

Product specification IC17 Data Handbook

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1997 Sept 25

Philips Semiconductors Product specification

Low voltage high performance mixer FM IF system with high-speed RSSI

DESCRIPTION

The SA626 is a low-voltage high performance monolithic FM IF system incorporating a mixer/oscillator, two limiting intermediate frequency amplifiers, quadrature detector, high speed logarithmic received signal strength indicator (RSSI), voltage regulator and audio and fast RSSI op amps. The SA626 is available in 20-lead SOL (surface-mounted small outline large package) and 20-lead SSOP (shrink small outline package).

The SA626 was designed for high bandwidth portable communication applications and will function down to 2.7V . The RF section is similar to the famous NE605. The audio and RSSI outputs have amplifiers. The RSSI output has access to the feedback pin. This enables the designer to level adjust the outputs or add filtering.

SA626 incorporates a power down mode which powers down the device when Pin 8 is low. Power down logic levels are CMOS and TTL compatible with high input impedance.

APPLICATIONS

•Digital cordless telephones

•Digital cellular telephones

•Digital cellular base stations

•Portable 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

FEA TURES

•Fast RSSI rise and fall times

•Low power consumption: 6.5mA typ at 3V

•Power down mode (I

= 200µA)

PIN CONFIGURATION

•Mixer input to >500MHz

•Mixer conversion power gain of 11dB at 240MHz

•Mixer noise figure of 14dB at 240MHz

•XTAL oscillator effective to 150MHz (L.C. oscillator to 1GHz, local

•92dB of IF Amp/Limiter power gain

•25MHz limiter small signal bandwidth

•Temperature compensated logarithmic Received Signal Strength

•Audio output internal buffer

•RSSI output internal buffer

•Internal op amps with rail-to-rail outputs

•10.7MHz filter matching (330Ω) reduces external component

•Excellent sensitivity: 0.54µV into 50Ω matching network for 12dB

•SA626 meets cellular radio specifications

•ESD hardened

SA626

D and DK Packages

RF BYPASS 2

XTAL OSC EMITTER 3

XTAL OSC (BASE) 4

RSSI FEEDBACK

RSSI

POWER DOWN CONTROL

AUDIO OUT

QUADRATURE IN

oscillator can be injected)

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

count; suitable for crystal/ceramic/LC filters

SINAD (Signal to Noise and Distortion ratio) for 1kHz tone with RF

at 240MHz and IF at 10.7MHz

OUT

Figure 1. Pin Configuration

20 MIXER OUT 19

IF AMP DECOUPLING 18 IF AMP IN 17

IF AMP DECOUPLING 16 IF AMP OUT 15 GND 14 LIMITER IN

LIMITER DECOUPLING

13 12

LIMITER DECOUPLING 11 LIMITER OUT

SR00470

ORDERING INFORMATION

DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #

20-Pin Plastic Small Outline Large (SOL) package (Surface-mount) -40 to +85°C SA626D SOT163-1 20-Pin Plastic Shrink Small Outline Package (Surface-mount) -40 to +85°C SA626DK

1997 Sept 25 853-1723 18427

SOT266-1

Philips Semiconductors Product specification

Low voltage high performance mixer FM IF system with high-speed RSSI

BLOCK DIAGRAM

20 19 18 17 16 15 14 13 12 11

IF AMP

MIXER

OSCILLATOR

Figure 2. Block Diagram

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNITS

STG

Single supply voltage 0.3 to 7 V Voltage applied to any other pin –0.3 to (VCC+0.3) V

Storage temperature range -65 to +150 Operating ambient temperature range SA626 –40 to +85

Thermal impedance D package 90

DK package 117

GND

RSSI

FAST RSSI

LIMITER

QUAD

+–

PWR DWN

+–

AUDIO

10987654321

SA626

SR00471

°C

°C °C/W °C/W

DC ELECTRICAL CHARACTERISTICS

VCC = +3V, TA = 25°C; unless otherwise stated.

LIMITS

SYMBOL PARAMETER TEST CONDITIONS SA626 UNITS

MIN TYP MAX

I I

OFF

Power supply voltage range 2.7 3.0 5.5 V

DC current drain Pin 8 = HIGH 5.5 6.5 7.5 mA

Standby Pin 8 = LOW 0.2 0.5 mA

Input current Pin 8 LOW –10 10 µA

Pin 8 HIGH –10 10 µA

Input level Pin 8 LOW 0 0.3V

Pin 8 HIGH 0.7V

Power up time RSSI valid (10% to 90%) 10 µs

Power down time RSSI invalid (90% to 10%) 5 µs

V V

1997 Sept 25

Philips Semiconductors Product specification

Low voltage high performance mixer FM IF system with high-speed RSSI

AC ELECTRICAL CHARACTERISTICS

TA = 25°C; VCC = +3V, unless otherwise stated. RF frequency = 240.05MHz + 14.5dBV RF input step-up; IF frequency = 10.7MHz; RF level =

-68dBm; FM modulation = 1kHz with ±125kHz peak deviation. Audio output with C-message weighted filter and de-emphasis filter. Test circuit Figure 1. The parameters listed below 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.

LIMITS

SYMBOL PARAMETER TEST CONDITIONS SA626 UNITS

MIN TYP MAX

Mixer/Osc section (ext LO = 160mV

Input signal frequency 500 MHz

OSC

IF section

THD Total harmonic distortion -43 –38 dB

S/N Signal-to-noise ratio No modulation for noise 60 dB

RF/IF section (int LO)

External oscillator (buffer) 500 MHz Noise figure at 240MHz 14 dB Third-order input intercept point Matched f1=240.05; f2=240.35MHz -16 dBm Conversion power gain Matched 14.5dBV step-up 8 11 14 dB RF input resistance Single-ended input 700 Ω RF input capacitance 3.5 pF Mixer output resistance (Pin 20) 330 Ω

IF amp power gain 38 dB Limiter amp power gain 54 dB Input limiting -3dB Test at Pin 18 –105 dBm AM rejection 80% AM 1kHz 50 dB Audio level Unity gain 120 160 200 mV Audio DC level Pin 9, no signal 1.0 V SINAD sensitivity IF level = -111dBm 16 dB

IF RSSI output with buffer IF level = -118dBm 0.2 0.5 V

IF RSSI output rise time IF frequency = 10.7MHz (10kHz pulse, no 10.7MHz filter) RF level = -56dBm 1.2 µs (no RSSI bypass capacitor) RF level = -28dBm 1.1 µs IF RSSI output fall time IF frequency = 10.7MHz (10kHz pulse, no 10.7MHz filter) RF level = -56dBm 2.0 µs (no RSSI bypass capacitor) RF level = -28dBm 7.3 µs RSSI range 90 dB RSSI accuracy +1.5 dB IF input impedance 330 Ω IF output impedance 330 Ω Limiter input impedance 330 Ω Limiter output impedance 300 Ω Limiter output level with no load 130 mV

Audio level RF level = -10dBm 160 mV System RSSI output RF level = -10dBm 1.4 V System SINAD RF level = -106dBm 12 dB

RMS

)

IF level = -68dBm 0.3 0.6 1.0 V IF level = -10dBm 0.9 1.3 1.8 V

SA626

RMS

1997 Sept 25

Philips Semiconductors Product specification

Low voltage high performance mixer FM IF system with high-speed RSSI

9.0

8.5

8.0

7.5

7.0

6.5

SUPPLY CURRENT (mA)

6.0

5.5

5.0 –50 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90

TEMPERATURE (°C)

= 5V

VCC = 3V

= 2.7V

Supply Current vs Temp and Supply Voltage Power Down Supply Current vs Temp and Supply Voltage

20 19 18 17 16 15 14 13 12

MIXER GAIN (dB)

11 10

9 8 7 6 5

Mixer Power Gain vs Temperature and Supply Voltage

300 275 250 225 200 175 150

AUDIO (mV)

125 100

75 50 25

= 5V

VCC = 3V

= 2.7V

–50 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90

TEMPERATURE (°C)

= 5V

VCC = 3V

= 2.7V

Third Order Input Intercept Point vs Temp and Supply Voltage

Audio Output Level vs. Temp and Supply Voltage

Figure 3. Performance Characteristics

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

POWER DOWN SUPPLY CURRENT (mA)

0.05

0.00 –50 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90

–6

–8 –10 –12 –14 –16 –18 –20 –22 –24 –26

THIRD ORDER INPUT INTERCEPT POINT dBm)

–28 –30

–50 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90

–20

–40

AUDIO (dB)

–60

–80

–100

–120

–50–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90

12dB SINAD and Relative Audio, THD, Noise and AM

Rejection for VCC = 3V vs Temperature RF = 240MHz,

Level = –68dBm, Deviation = 125kHz

= 5V

= 3V

VCC = 2.7V

= 5V

VCC = 3V

= 2.7V

AUDIO

AM REJECTION

DISTORTION

NOISE

12dB SINAD

SA626

100

TEMPERATURE (°C)

SR00472

1997 Sept 25

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