Philips sa647 DATASHEETS

INTEGRATED CIRCUITS

SA647
Low-voltage digital IF receiver

Product specification 1998 Aug 10

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Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

DESCRIPTION

The SA647 is a low-voltage high performance monolithic digital
system with high-speed RSSI incorporating a mixer, oscillator with
buffered output, two limiting intermediate frequency amplifiers, fast
logarithmic received signal strength indicator (RSSI), voltage
regulator, RSSI op amp and power down pin. The SA647 is
available in TSSOP (thin shrink small outline package).

The SA647 was designed for portable digital communication
applications and will function down to 2.7V . The limiter amplifier has
differential outputs with 2MHz small signal bandwidth. The RSSI
output has access to the feedback pin. This enables the designer to
level adjust the outputs or add filtering.

FEA TURES

•V

= 2.7 to 5.5V

CC

•Low power receiver (5.3mA @ 3V)

•Power down mode (I

= 110µA)

CC

•Fast RSSI rise and fall times

•Extended RSSI range with temperature compensation

•RSSI op amp

•2MHz limiter small signal bandwidth

•Filter matching (1.5kΩ)

•Differential limiter output

•Oscillator buffer

•TSSOP-20 package

APPLICA TIONS

•NADC (North American Digital Cellular)

•Digital receiver systems

•Cellular radio

PIN CONFIGURATION

1

RF

IN+

2

RF

IN–

3

OSC E

4

OSC B

OSC

BUF

LIM OUT (-)

5

OUT

6

V

CC

7

RSSI

8

RSSI FB

9

P

D

10

Figure 1. Pin Configuration

20

MIX

19

IF AMP

18

IF AMP

17

IF AMP

16

IF AMP

15

GND

14

LIM

13

LIM

12

LIM

11

LIM OUT (+)

OUT

DECOUP
IN

DECOUP

OUT

IN

DECOUP

DECOUP

SR01456

ORDERING INFORMATION

DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #

20-Pin Plastic Thin Shrink Small Outline Package (Surface-mount) –40 to +85°C SA647DH SOT360–1

20 19 18 17 16 15 14 13 12 11

GND

IF
AMP

MIXER

OSCILLATOR

FAST RSSI

+–

EB

123 45678 910

V

CC

Figure 2. Block Diagram

+–

LIMITER

POWER

DOWN

SR01727

1998 Aug 10 853–2037 19849

2

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

PIN DESCRIPTION

PIN NO. SYMBOL FUNCTION

1 RF

IN

2 RF BYPASS RF bypass
3 OSC
4 OSC
5 OSC
6 V

E
B

OUT Oscillator buffer output

BUF

CC

7 RSSI RSSI output
8 RSSI FB RSSI Feedback

9 P
10 LIM
11 LIM
12 LIM
13 LIM
14 LIM

D

OUT(–)
OUT(+)
DECOUP
DECOUP
IN

15 GND Ground
16 IF AMP
17 IF AMP
18 IF AMP
19 IF AMP
20 MIX

OUT
DECOUP
IN
DECOUP

OUT

RF input

Oscillator emitter
Oscillator base (input)

Supply voltage

Power Down
Limiter output (neg)
Limiter output (pos)
Limiter decoupling
Limiter decoupling
Limiter input

IF amplifier output
IF amplifier decoupling
IF amplifier input
IF amplifier decoupling
Mixer output

1998 Aug 10

3

Philips Semiconductors Product specification

SYMBOL

PARAMETER

TEST CONDITIONS

UNITS

A

V

SA647Low-voltage digital IF receiver

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNITS

V

CC

V

IN

T

STG

T

A

NOTE: Thermal impedance (θJA) = 135°C/W

DC ELECTRICAL CHARACTERISTICS

VCC = +3.0V , TA = 25°C; unless otherwise stated.

V

CC

I

CC

τ

on

τ

off

Supply voltage -0.3 to +6.0 V
Voltage applied to any other pin -0.3 to (VCC + 0.3) V

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

°C
°C

LIMITS

MIN TYP MAX

Power supply voltage range 2.7 5.5 V
DC current drain 4 5.3 7 mA
Standby Pin 9 = LOW 0.11 mA
Input current Pin 9 = LOW -10 10

Pin 9 = HIGH -10 10

Input level Pin 9 = LOW 0 0.3V

Pin 9 = HIGH 0.7 V

CC

V
Power–up time RSSI valid (10% to 90%) 10
Power–down time RSSI valid (90% to 10%) 5

CC

CC

µ

sec
sec

1998 Aug 10

4

Philips Semiconductors Product specification

SYMBOL

PARAMETER

TEST CONDITIONS

UNITS

SA647Low-voltage digital IF receiver

AC ELECTRICAL CHARACTERISTICS

VCC = +3.0V , Mixer input freq = 110.52MHz, LO input freq = 109.92MHz, TA = 25°C; unless otherwise stated.

LIMITS

MIN TYP MAX

Mixer/Osc section

f

IN

f

OSC

NF Noise figure at 110.52MHz Matched input and output 50Ω 4.5 dB
IIP3 Third-order input intercept point Matched input and output to 50Ω -29.5 dBm
G

CP

R

C

R

OUT

I

SOL

IF section

IF

BW

Input signal frequency 200 MHz
Crystal oscillator frequency 200 MHz

Conversion power gain Matched input and output to 50Ω 17 20 23 dB
Mixer input resistance at 110.52 MHz 670 Ω

IN

Mixer input capacitance at 110.52 MHz 3.0 pF

IN

Mixer output resistance at 600 kHz 1.5 kΩ
Mixer RF to LO isolation 32 dB
Buffered LO output level, DC coupled 10kII3.9pF load 110 230 320 mV
External input level f = 110.52 MHz at Pin 4 250 mV

IF amp power gain

Matched input and output 50W

30 36 dB
Limiter power gain 51 60 dB
IF amp bandwidth 2 MHz
RSSI output Input power level = -113dBm, Pin 1 0.30 V

Input power level = -68dBm, Pin 1 1.00 V

Input power level = -29dBm, Pin 1 1.55 V
RSSI range 85 dB
RSSI accuracy ±1.5 dB
RSSI ripple 30 mV
RSSI speed – (Rise Time)

Input @ Pin 1 No filter

RSSI speed – (Fall time)

Input @ Pin 1

No filter 25 µs

5 µs

IF input impedance 1.5 kΩ
IF output impedance 1.5 kΩ
Limiter input impedance 1.5 kΩ
Limiter output impedance (Pin 10, Pin 11) 230 Ω

Limiter output (each pin)

Output load is 1.5K in parallel with 30

pF to GND each pin

240 350 420 mV

Limiter output DC level 1.27 V
Differential output matching ±5 mV
Limiter output offset 0.09 V

P–P
P–P

P–P

P–P

1998 Aug 10

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