Philips SA639DH Datasheet

INTEGRATED CIRCUITS

SA639

Low voltage mixer FM IF system with filter amplifier and data switch

Product specification 1998 Feb 10 IC17 Data Handbook

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Philips Semiconductors Product specification

Low voltage mixer FM IF system with filter amplifier and data switch

DESCRIPTION

The SA639 is a low-voltage high performance monolithic FM IF system with high-speed RSSI incorporating a mixer/oscillator, two wideband limiting intermediate frequency amplifiers, quadrature detector, logarithmic received signal strength indicator (RSSI), fast RSSI op amps, voltage regulator, wideband data output, post detection filter amplifier and data switch. The SA639 is available in 24-lead TSSOP (Thin shrink small outline package).

The SA639 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 data output provides a minimum bandwidth of 1MHz to demodulate wideband data. The RSSI output is amplified and has access to the feedback pin. This enables the designer to level adjust the outputs or add filtering.

The post-detection amplifier may be used to realize a low pass filter function. A programmable data switch routes a portion of the data signal to an external integration circuit that generates a data comparator reference voltage.

SA639 incorporates a power down mode which powers down the device when Pin 8 is high. Power down logic levels are CMOS and TTL compatible with high input impedance.

APPLICATIONS

•DECT (Digital European Cordless Telephone)

•FSK and ASK data receivers

FEATURES

•V

= 2.7 to 5.5V

•Low power consumption: 8.6mA typ at 3V

•Wideband data output (1MHz min.)

•Fast RSSI rise and fall times

•Mixer input to >500MHz

•Mixer conversion power gain of 9.2dB and noise figure of 11dB at

110MHz

PIN CONFIGURATION

RF BYPASS

XTAL OSC (EMITTER)

XTAL OSC (BASE)

RSSI FEEDBACK

RSSI OUT

POWER DOWN CONTROL

DATA OUT

POSTAMP IN

POSTAMP OUT

SWITCH CONTROL

•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 80dB

•RSSI output internal op amp

•Post detection amplifier for filtering

•Programmable data switch

•Excellent sensitivity: 2.24µV into 50Ω matching network for 10dB

SNR (Signal to Noise Ratio) with RF at 110MHz and IF at 9.8MHz

•ESD hardened

•Power down mode

2 3 4 5

6 7 8

9 10 11 12

24 23 22 21 20 19 18 17 16 15 14 13

Figure 1. Pin Configuration

SA639

MIXER OUT IF AMP DECOUPLING

IF AMP IN IF AMP DECOUPLING

IF AMP OUT GND

LIMITER IN LIMITER DECOUPLING

LIMITER DECOUPLING LIMITER OUT

QUADRATURE IN SWITCH OUT

SR00030

ORDERING INFORMATION

DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #

24-Pin Plastic TSSOP (Thin Shrink Small Outline Package) -40 to +85°C SA639DH

1998 Feb 10 853-1792 18944

SOT-355

Philips Semiconductors Product specification

Input current

Input level

Input current

Low voltage mixer FM IF system with filter amplifier and data switch

BLOCK DIAGRAM

23 22

IF AMP

MIXER

OSCILLATOR

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNITS

STG

NOTE:

1. Except logic input pins (Pins 8 and 12) which can have 6V maximum.

Thermal impedance (DH package) 117°C/W

2. θ

Single supply voltage -0.3 to 6 V Voltage applied to any other pin

Storage temperature range -65 to +150 Operating ambient temperature range SA639

20 19 18 17 16 15 14 132124

GND

RSSI

Figure 2. Block Diagram

FAST RSSI

+–

LIMITER

PWR DWN

DATA

QUAD

+–

10987654321

1211

-0.3 to (VCC+0.3) V

-40 to +85

SA639

SR00031

°C °C

DC ELECTRICAL CHARACTERISTICS

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

LIMITS

SYMBOL PARAMETER TEST CONDITIONS SA639 UNITS

MIN -3σ TYP +3σ MAX

I I

OFF

NOTE:

1. When the device is forced in power down mode via Pin 8, the Data Switch will output a voltage close to 1.6V and the state of the switch control input will have no effect.

Power supply voltage range 2.7 3.0 5.5 V

DC current drain Pin 8 = LOW, Pin 12 = HIGH 8.33 8.6 8.87 10 mA

Standby Pin 8 = HIGH, Pin 12 = HIGH 131.9 140 148.1 500 µA

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

Pin 8 = LOW 10

Pin 8 = HIGH 4

Pin 8 = LOW 0 0.3V

Pin 8 = HIGH

NO TAG

0.7V

Power down time RSSI invalid (90% to 10%) 5 µs Power up settling time Data output valid 100 200 µs

Switch closed Pin 12 = LOW, PIN 8 = LOW 0 0.3 V Switch open (output tri-state) Pin 12 = HIGH 0.7 V

Pin 12 = LOW 10 Pin 12 = HIGH 4

Switch activation time 0.5 1 µs

6 V

1998 Feb 10

Philips Semiconductors Product specification

Low voltage mixer FM IF system with filter amplifier and data switch

AC ELECTRICAL CHARACTERISTICS

TA = 25°C; VCC = +3V, unless otherwise stated. RF frequency = 110.592MHz ;LO frequency = 120.392MHz; IF frequency = 9.8MHz; RF level = -45dBm; FM modulation = 576kHz with ±288kHz peak deviation, discriminator tank circuit Q=4. 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 SA639 UNITS

MIN -3σ TYP +3σ MAX

Mixer/Osc section (ext LO = -14dBm)

OSC

IF section

RF/IF section (ext LO = -14dBm)

S/N Signal-to-noise ratio No modulation for noise 56.1 60 63.9 dB

Input signal frequency 500 MHz

External oscillator (buffer) 0.2 500 MHz Noise figure at 110MHz 10.4 11 11.6 dB

Third-order input intercept point Conversion power gain 6 8.6 9.2 11.1 dB

RF input resistance Single-ended input 800 Ω RF input capacitance 3.5 pF Mixer output resistance (Pin 24) 330 Ω

IF amp gain 38.86 40 41.14 dB Limiter gain 50.44 52 53.56 dB Input limiting -3dB Test at Pin 22 –100 dBm 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

Data level RL = 10kΩ, CL = 30pF 260 360 mV Data bandwidth 2.1 2.4 2.7 MHz

AM rejection 80% AM 1kHz 34.8 36 37.2 dB

RF RSSI output with buffer RF level = -45dBm 0.5 0.732 0.9 1.068 1.3 V

RF RSSI output rise time IF frequency = 9.8MHz (10kHz pulse, w/ 9.8MHz filter) RF level = -45dBm 0.8 (no RSSI bypass capacitor) RF level = -28dBm 0.8 RF RSSI output fall time IF frequency = 9.8MHz (10kHz pulse, w/ 9.8MHz filter) RF level = -45dBm 2.0 (no RSSI bypass capacitor) RF level = -28dBm 1.8 RSSI range 80 dB RSSI accuracy ±1.5 dB SINAD RF level = -85dBm 9.45 12 14.55 dB S/N RF level = -100dBm 5.8 10 14.2 dB

Matched f1=110.592MHz;

f2=110.852MHz

RF level = -90dBm 0 0.232 0.4 0.568 0.75

RF level = -10dBm 0.8 1.032 1.2 1.368 1.6

-11 -9.5 -8 dBm

130 mV

SA639

RMS

P-P

1998 Feb 10

Philips Semiconductors Product specification

Dynamic offset voltage

Low voltage mixer FM IF system with filter amplifier and data switch

AC ELECTRICAL CHARACTERISTICS (Continued)

LIMITS

SYMBOL PARAMETER TEST CONDITIONS SA639 UNITS

MIN -3σ TYP +3σ MAX

Post detection filter amplifier

Amplifier 3dB bandwidth

Amplifier gain

Slew rate Input resistance 300 kΩ

Input capacitance 3 pF Output impedance 150 800 Ω Output load resistance AC coupled 5 kΩ Output load capacitance DC output level

Data switch

DC input voltage range

AC input swing 400 mV Input impedance 100 kΩ Input capacitance 5 pF Output load resistance 500 Ω

Through Mode (Pin 12 = LOW)

AC voltage gain

Output drive capability Sink/source, V Slew rate V Static offset voltage

Tri-State Mode (Pin 12 = HIGH)

Output leakage current V

NOTES:

1. Includes filter feedback capacitance, comparator input capacitance. PCB stray capacitances and switch input capacitance.

2. Demodulator output DC coupled with Post Detection Filter Amplifier input and the demodulator tank exactly tuned to center frequency.

3. Includes DC offsets due to frequency offsets between Rx and Tx carrier and demodulator tank offset due to mis-tuning.

4. With a 400mV

5. With a DC input and capacitor in the RC load fully charged.

sinusoid at 600kHz driving Pin 10. Output load resistance 500Ω in series with 10nF.

P-P

6. The switch is closed every 10ms for a duration of 40µs. The DC offset is determined by calculating the difference of 2 DC measurements, which are determined as follows: 1) The first DC value is measured at the integrating capacitor of the switch when the switch is in the closed position immediately before it opens. The value to be measured is in the middle of the peak-to-peak excursion of the superimposed sine-wave. (DClow + (DChigh – DClow)/2). 2) The second DC value (calculated as above) is measured at Pin 11 immediately after the switch opens, and is the DC value which gives the largest DC offset to the first DC measurement within a 400µs DECT burst. Minimum and maximum limits are not tested, however, they are guaranteed by design and characterization using an optimized layout and application circuit.

7. Standard deviations are measured based on application of 60 parts.

AC coupled: RL = 10kΩ,

= 33pF

AC coupled: RL = 10kΩ,

OUT DC

= 1.6V

AC coupled: RL = 10kΩ,

CL = 33pF

11.7 12.8 13.8 MHz

-0.2 dB

2.4 V/µs

AC coupled 30 pF

1.5 1.682 1.7 1.718 1.9 V

1.2 1.6 2.0 V

-1.5 dB

= 1.6V 3 mA

OUT DC

= 1.6V >14.0 V/µs

OUT DC

= 1.2 to 2.0V -0.6 0.30 1.2 ±5 mV

IN DC

= 1.4 to 2.0V;

IN DC

VCC = 3.0 to 5.0V;

-7 +7

RF level = -70 to -40 dBm

= 1.4 to 2.0V;

IN DC

VCC = 3.0 to 5.0V;

-10 +10

RF level = -40 to -5 dBm

= 1.2 to 2.0V 9.5 20 30.5 100 nA

OUT DC

SA639

P-P

1998 Feb 10

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