Philips SA626D, SA626DK Datasheet

INTEGRATED CIRCUITS

SA626

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

Product specification

1997 Sept 25

IC17 Data Handbook

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Philips Semiconductors	Product specification

Low voltage high performance mixer FM IF

SA626

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

FEATURES

•Fast RSSI rise and fall times

•Low power consumption: 6.5mA typ at 3V

•Power down mode (ICC = 200μA)

PIN CONFIGURATION

D and DK Packages

RFIN	1		20	MIXER OUT
RF BYPASS	2		19	IF AMP DECOUPLING
XTAL OSC EMITTER	3		18	IF AMP IN
XTAL OSC (BASE)	4		17	IF AMP DECOUPLING
VCC	5		16	IF AMP OUT
RSSI FEEDBACK	6		15	GND
RSSIOUT	7		14	LIMITER IN
POWER DOWN CONTROL	8		13	LIMITER DECOUPLING
AUDIO OUT	9		12	LIMITER DECOUPLING
QUADRATURE IN	10		11	LIMITER OUT

SR00470

Figure 1. 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 oscillator can be injected)

•92dB of IF Amp/Limiter power gain

•25MHz limiter small signal bandwidth

•Temperature compensated logarithmic Received Signal Strength

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

•Audio output internal buffer

•RSSI output internal buffer

•Internal op amps with rail-to-rail outputs

•10.7MHz filter matching (330Ω) reduces external component count; suitable for crystal/ceramic/LC filters

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

SINAD (Signal to Noise and Distortion ratio) for 1kHz tone with RF at 240MHz and IF at 10.7MHz

•SA626 meets cellular radio specifications

•ESD hardened

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)	°	SA626DK	SOT266-1
	-40 to +85 C

1997 Sept 25

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853-1723 18427

Philips Semiconductors	Product specification

Low voltage high performance mixer FM IF system

SA626

with high-speed RSSI

BLOCK DIAGRAM

20	19	18	17	16	15	14	13		12	11
			IF		GND
							LIMITER
			AMP
	MIXER
					FAST			QUAD
		OSCILLATOR			RSSI
				VCC	±	+	PWR	±	+
							DWN
		E	B		RSSI				AUDIO
1	2	3	4	5	6	7	8		9	10	SR00471

Figure 2. Block Diagram

ABSOLUTE MAXIMUM RATINGS

SYMBOL

PARAMETER

RATING

UNITS

VCC

Single supply voltage

0.3 to 7

V

VIN

Voltage applied to any other pin

±0.3 to (VCC+0.3)

V

TSTG

Storage temperature range

-65 to +150

°C

T

Operating ambient temperature range SA626

±40 to +85

°

A

C

θJA

Thermal impedance

D package

90

°C/W

DK package

117

°C/W

DC ELECTRICAL CHARACTERISTICS

VCC = +3V,

TA = 25°C; unless otherwise stated.

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

SA626

UNITS

MIN

TYP

MAX

VCC

Power supply voltage range

2.7

3.0

5.5

V

ICC

DC current drain

Pin 8 = HIGH

5.5

6.5

7.5

mA

ICC

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

0.3VCC

V

Pin 8 HIGH

0.7VCC

VCC

V

tON

Power up time

RSSI valid (10% to 90%)

10

μs

tOFF

Power down time

RSSI invalid (90% to 10%)

5

μs

1997 Sept 25

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Philips Semiconductors	Product specification

Low voltage high performance mixer FM IF system

SA626

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 = 160mVRMS)

fIN	Input signal frequency			500		MHz
fOSC	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 section
	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	mVRMS
	Audio DC level	Pin 9, no signal		1.0		V
	SINAD sensitivity	IF level = -111dBm		16		dB
THD	Total harmonic distortion			-43	±38	dB
S/N	Signal-to-noise ratio	No modulation for noise		60		dB
	IF RSSI output with buffer	IF level = -118dBm		0.2	0.5	V
		IF level = -68dBm	0.3	0.6	1.0	V
		IF level = -10dBm	0.9	1.3	1.8	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		mVRMS
RF/IF section (int LO)
	Audio level	RF level = -10dBm		160		mVRMS
	System RSSI output	RF level = -10dBm		1.4		V
	System SINAD	RF level = -106dBm		12		dB

1997 Sept 25

4

Philips Semiconductors	Product specification

Low voltage high performance mixer FM IF system

SA626

with high-speed RSSI

	9.0
	8.5
(mA)	8.0									VCC = 5V
CURRENT	7.5
	7.0									VCC = 3V
SUPPLY	6.5
										VCC = 2.7V
	6.0
	5.5
	5.0
	±50 ±40 ±30	±20	±10	0	10	20	30	40	50	60	70	80	90
			TEMPERATURE (°C)

Supply Current vs Temp and Supply Voltage

	20
	19
	18
	17
(dB)	16
	15	VCC = 5V
GAIN	14
	13
MIXER
	12	VCC = 3V
	11
	10	VCC = 2.7V
	9
	8
	7
	6
	5
	±50 ±40 ±30		±20	±10	0	10	20	30	40	50	60	70	80	90
				TEMPERATURE (°C)

Mixer Power Gain vs Temperature and Supply Voltage

	300
	275
	250
	225
(mV)	200									VCC = 5V
	175
AUDIO	150									VCC = 3V
	125
										VCC = 2.7V
	100
	75
	50
	25
	0
	±50 ±40 ±30	±20	±10	0	10	20	30	40	50	60	70	80	90
				TEMPERATURE (°C)

Audio Output Level vs. Temp and Supply Voltage

	0.50
	0.45
(mA)	0.40
CURRENT	0.35
	VCC = 5V
	0.30
SUPPLY
	VCC = 3V
	0.25
DOWN	0.20
	VCC	= 2.7V
POWER	0.15
	0.10
	0.05
	0.00
	±50±40 ±30 ±20 ±10	0	10	20	30	40	50	60	70	80	90 100

TEMPERATURE (°C)

Power Down Supply Current vs Temp and Supply Voltage

±6

dBm)

±8

±10

POINT

±12

INTERCEPT

±14

VCC = 5V

±16

±18

INPUT

VCC = 3V

±20

ORDER

±22

VCC = 2.7V

±24

THIRD

±26

±28

±30

±50 ±40 ±30

±20

±10

0

10

20

30

40

50

60

70

80

90

TEMPERATURE (°C)

Third Order Input Intercept Point vs Temp and Supply Voltage

20

AUDIO

0

±20

AM REJECTION

(dB)±40
AUDIO	DISTORTION
±60
±80	NOISE
±100	12dB SINAD
±120
	±50 ±40 ±30 ±20 ±10	0	10	20	30	40	50	60	70	80	90
		TEMPERATURE (°C)

12dB SINAD and Relative Audio, THD, Noise and AM Rejection for VCC = 3V vs Temperature RF = 240MHz,

Level = ±68dBm, Deviation = 125kHz

SR00472

Figure 3. Performance Characteristics

1997 Sept 25

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