Datasheet SA647DH, SA647DK Datasheet (Philips)

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SA647
Low-voltage digital IF receiver

Product specification 1998 Aug 10

INTEGRATED CIRCUITS

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

2

1998 Aug 10 853–2037 19849

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

CC

= 2.7 to 5.5V

•Low power receiver (5.3mA @ 3V)

•Power down mode (I

CC

= 110µA)

•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

SR01456

MIX

OUT

IF AMP

IN

GND
LIM

IN

LIM OUT (+)

RF

IN+

RF

IN–

OSC E
OSC B

OSC

BUF

OUT

RSSI

RSSI FB

P

D

1
2
3
4
5
6
7
8
9

10

11

12

13

14

20
19
18
17
16
15

LIM OUT (-)

V

CC

IF AMP

DECOUP

IF AMP

DECOUP

IF AMP

OUT

LIM

DECOUP

LIM

DECOUP

Figure 1. Pin Configuration

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

SR01727

OSCILLATOR

MIXER

+–

IF
AMP

20 19 18 17 16 15 14 13 12 11

123 45678 910

EB

LIMITER

V

CC

GND

FAST RSSI

+–

POWER

DOWN

Figure 2. Block Diagram

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

3

PIN DESCRIPTION

PIN NO. SYMBOL FUNCTION

1 RF

IN

RF input
2 RF BYPASS RF bypass
3 OSC

E

Oscillator emitter
4 OSC

B

Oscillator base (input)
5 OSC

BUF

OUT Oscillator buffer output

6 V

CC

Supply voltage
7 RSSI RSSI output
8 RSSI FB RSSI Feedback
9 P

D

Power Down

10 LIM

OUT(–)

Limiter output (neg)

11 LIM

OUT(+)

Limiter output (pos)

12 LIM

DECOUP

Limiter decoupling

13 LIM

DECOUP

Limiter decoupling

14 LIM

IN

Limiter input

15 GND Ground
16 IF AMP

OUT

IF amplifier output

17 IF AMP

DECOUP

IF amplifier decoupling

18 IF AMP

IN

IF amplifier input

19 IF AMP

DECOUP

IF amplifier decoupling

20 MIX

OUT

Mixer output

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

4

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNITS

V

CC

Supply voltage -0.3 to +6.0 V

V

IN

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

T

STG

Storage temperature range -65 to +150

°C

T

A

Operating ambient temperature range -40 to +85

°C

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

DC ELECTRICAL CHARACTERISTICS

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

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

MIN TYP MAX

UNITS

V

CC

Power supply voltage range 2.7 5.5 V

I

CC

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

µ

A

Input level Pin 9 = LOW 0 0.3V

CC

Pin 9 = HIGH 0.7 V

CC

V

CC

V

τ

on

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

sec

τ

off

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

sec

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

5

AC ELECTRICAL CHARACTERISTICS

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

LIMITS

SYMBOL

PARAMETER

TEST CONDITIONS

MIN TYP MAX

UNITS

Mixer/Osc section

f

IN

Input signal frequency 200 MHz

f

OSC

Crystal oscillator frequency 200 MHz

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

Conversion power gain Matched input and output to 50Ω 17 20 23 dB

R

IN

Mixer input resistance at 110.52 MHz 670 Ω

C

IN

Mixer input capacitance at 110.52 MHz 3.0 pF

R

OUT

Mixer output resistance at 600 kHz 1.5 kΩ

I

SOL

Mixer RF to LO isolation 32 dB
Buffered LO output level, DC coupled 10kII3.9pF load 110 230 320 mV

P–P

External input level f = 110.52 MHz at Pin 4 250 mV

P–P

IF section

IF amp power gain

Matched input and output 50W

30 36 dB

Limiter power gain 51 60 dB

IF

BW

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

P–P

RSSI speed – (Rise Time)

Input @ Pin 1 No filter

5 µs

RSSI speed – (Fall time)

Input @ Pin 1

No filter 25 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

P–P

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

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

6

CIRCUIT DESCRIPTION
Mixer

The mixer has a single–ended input. The input impedance is 670Ω
in parallel with a 3.0pF cap at 110.52MHz RF. The mixer output can
drive a 1500Ω ceramic filter without any matching required.

Oscillator and Buffer

The on-board oscillator supplies the signal for the mixer
down-conversion. The internally biased transistor can be configured
as a Colpitts or Butler overtone crystal oscillator. The transistor’s
bias current can be increased if desired by adding a shunt resistor
from Pin 3 to ground. The oscillator’s buffered output (Pin 5) can be
used as a feedback signal to lock the oscillator to an appropriate
reference.

IF Amplifier and IF Limiter

The IF strip provides more than 96dB of power gain for the down
converted signal. Its bandwidth is 2MHz. The input and output
impedance of the IF amplifier and the input impedance of the IF
limiter are set to 1500Ω. A second filter is connected between the IF
amplifier and the limiter for improved channel selectivity and
reduced instability . The overall gain can be reduced if desired by
adding an external attenuator after the IF amplifier The differential
limiter outputs (Pins 10 and 11) are available for demodulator
circuits.

RSSI

The received signal strength indicator provides a linear voltage
indication of the received signal strength in dB for a typical range of
85dB. The response time to a change in input signal is less than a
few microseconds and the delay is kept to a minimum because of
the use of a minimum phase shift circuit. Because of the speed of
the RSSI circuit, the RSSI rise and fall time will be dominated by the
bandwidth of the external bandpass filter that is placed between the
mixer and the IF. Since the RSSI function requires the signal to
propagate through the whole IF strip, and the rise and fall time of the
filters are inversely proportional to their bandwidth, there is a
trade-off between channel selectivity and RSSI response.
Therefore, it is recommended that all channel selection filters be
placed before the IF strip, just after the mixer. This will make the
delay of the RSSI independent of the mixer input signal amplitude.
Also, a 6dB insertion loss between the IF and limiter sections (Pins
16 and 14) will give optimum flatness of RSSI versus mixer input
signal.

The RSSI curve is temperature compensated and in addition is
designed for improved consistency from unit to unit.

DC Power Supply

The IC is designed for operation between 2.7 and 5.5V. A power
supply dependent biasing scheme is used in the mixers to benefit
from the large headroom available at higher V

CC

s.

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

7

PERFORMANCE CHARACTERISTICS

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

SR01554

Input Power (dBm)

LO Buffer Output vs Temperature and Supply Voltage

150

170

190

210

230

250

270

290

310

–40 0 25 70 85

5.5V

3.0V

2.7V

Supply Current vs Temperature and Supply Voltage

3.00

3.50

4.00

4.50

5.00

5.50

6.00

6.50

7.00

–40 0 25 70 85

Current (mA)

15.0

16.0

17.0

18.0

19.0

20.0

21.0

22.0

23.0

24.0

–40 0 25 70 85

Gain (dB)

Mixer Gain vs Temperature and Supply Voltage

Mixer 3rd Order Input Intercept Point vs Temperature

and Supply Voltage

–25
–26
–27
–28
–29
–30
–31

–32
–33

–40 0 25 70 85

IP3 (dBm)

Temperature (°C)

Temperature (°C)

5.5V

3.0V

3.8V

2.7V

Temperature (°C)

5.5V

3.0V

2.7V

Temperature (°C)

LO Buffer Output (mVp–p)

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0

–75 –70 –65 –60 –55 –50 –45 –40 –35 –30 –25

Output Power (dBm)

Mixer 3rd Order Intercept and Compression vs Input Power

Fund. Product

3rd Order Product

LO Buffer Output with Load Variation

Capacitor Load (pF)

2.7V

3.0V

5.5V

100

150

200

250

300

350

400

450

500

550

0

LO Output (mVp–p)

1 2.2 3 3.9 4.7 5.6

Mixer Noise Figure vs Temperature and Supply Voltage

3.5

4.0

4.5

5.0

5.5

–40 0 25 70 85

Noise Figure (dB)

2.7V

3.0V

5.5V

Temperature (°C)

Mixer 1dB Input Compression vs Temperature and Supply Voltage

–42

–41

–40

–39

–38

–37

–36

–40 0 25 70 85

Compression (dBm)

2.7V

3.0V

5.5V

Temperature (°C)

Load = 10KW 3.9pF

5.1KW

10KW

Figure 3.

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

8

SR01555

IF Gain vs Temperature and Supply Voltage

35.0

35.5

36.0

36.5

37.0

37.5

38.0

38.5

–40 0 25 70 85

Gain (dB)

5.5V

3.0V

2.7V

Limiter Gain vs Temperature and Supply V oltage

60.0

60.5

61.0

61.5

62.0

62.5

63.0

63.5

64.0

64.5

65.0

25 70 85

Gain (dB)

5.5V

3.0V

2.7V

Limiter Output Offset vs Temperature and Supply V oltage

0.04

0.05

0.06

0.07

0.08

0.09

0.10

0.11

0.12

0.13

0.14

–400 257085

Offset (Volt)

2.7V

3.0V

5.5V

Limiter Bandwidth vs Temperature

1.6

1.8

2.0

2.2

2.4

2.6

2.8

–40 0 25 70 85

Bandwidth (MHz)

Limiter Output vs Temperature and Supply Voltage

200

250

300

350

400

450

–400 257085

Output (mVp–p)

2.7V

3.0V

5.5V

Temperature (°C)

Temperature (°C)

Temperature (°C)

Temperature (°C)

–40°C

Temperature (°C)

RSSI vs Temperature

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

–118 –108 –98 –88 –78 –68 –58 –48 –38 –28

RF Input (dBm)

RSSI (Volt)

25°C

85°C

–40°C

RSSI vs Supply Voltage

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

1.60

1.80

–118 –108 –98 –88 –78 –68 –58 –48 –38 –28

RF Input (dBm)

RSSI (Volt)

5.5V

3.0V

2.7V

IF Bandwidth vs. Temperature

2.0

2.2

2.4

2.6

2.8

3.0

3.2

3.4

–40 0 25 70 85

Bandwidth (MHz)

Temperature (°C)

Figure 4.

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

9

GENERAL TEST CIRCUIT DESCRIPTION

C1 0.01 mF C11 100nF C21 0.01mF R1 249W R13 50W R24 8.66W L1 120nH
C2 12pF C12 100nF C22 0.1mF R2 60.4W R14 13.7W R25 130W L2 120nH
C3 39pF C13 30pF C23 100nF R3 60.4W R15ą1.5KW R26 182W L3 56mH
C4 0.01mF C14 0.1mF C24 0.1mF R4 10KW R16 1.5KW R27 182W FLT 600kHz
C5 15pF C15 30pF C25 0.1mF R5 10KW R17 1KW R28 10KW
C6 39pF C16 100nF C26 100nF R6 10KW R18 13.7KW R29 10KW
C7 3.9pF C17 100nF C27 0.1mF R7 10KW R19 50KW R30 3.92KW
C8 0.1mF C18 0.1mF C28 0.1mF R8 10KW R20 1.69KW
C9 100nF C19 270pF R9 10KW R21 2.43KW

C10 100nF C20 1500pF R10 1.5KW R22 50W

R11 1.5KW R23 130W
R12 1.69KW

SR01728

10987654321

20 19 18 17 16 15 14

13 12 11

FAST RSSI

PWD

C11

R30

C28

C16

Automatic Test Circuit Component List

OSCILLATOR

LIMITER

+–

RSSI FB

IF
AMP

C12

C10

C9

OSC
BUFF

R10

LIMITER

LO INPUT

R8

R9

C7

R6

C4

R5

R4

C1

C2

L1

R2

R3

+–

C3

L2

C5

RF INPUT

C6

C8

OUT (–)

C13

R7

C17

R21

R22

R29

R28

R27

R26

R25

R24

C27

C25

C24

R20

R19

R18

C22

R17

C21

R16

R15

C20

L3

C19

R14

R13

C18

C23

C15

R11

C14

IF OR LIMITER INPUT

MIXER OUT

MX OUT

IF DEC

IF IN

IF DEC

IF OUT

GND

LIM IN

C14

R23

OSC B

OSC E

RF BYPASS

VCC

RSSI OUT

RF IN

LIM OUT –

POWER DOWN

LIM OUT+

LIM DEC

MIXER

2

5

1

3

4

C26

R1

FLT

LIMITER OUT (+)

LIM DEC

LO
BUFFER
OUTPUT

V

CC

RSSI
OUT

Figure 5.

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

10

1

4

3

18k

MIX

150µA

6

V

REF

BANDGAP

8

+

V

CC

—

7

V

CC

+

—

9

R

R

PIN

No.

PIN

MNEMONIC

DC V EQUIVALENT CIRCUIT

PIN

No.

PIN

MNEMONIC

DC V EQUIVALENT CIRCUIT

1 RF IN +2.35

8

RSSI

+0.20

FEEDBACK

2

RF

+1.56

7

RSSI

+0.20

OUT

BYPASS

3

OSC

+2.21

9

POWER

+2.00

DOWN

E

4

OSC

+2.78

B

6V

CC

+3.00

5

150µA

5

OSC

+2.21

BUFFER

SR01729

2

RF BYPASS

RF IN

26

30K

400

Figure 6.

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

11

11

14

20

PIN

No.

PIN

MNEMONIC

DC V EQUIVALENT CIRCUIT

PIN

No.

PIN

MNEMONIC

DC V EQUIVALENT CIRCUIT

11

LIMITER

+1.25 16

IF

+1.28

AMP OUT

12

LIMITER

+1.28 17

IF AMP

+1.28

DECOUPDECOUP

13

LIMITER

+1.28 18

IF

+1.28

AMP INCOUPLING

14

LIMITER

+1.28 19

IF AMP

+1.28

DECOUPIN

15 GND 0 20

MIXER

+2.03

OUT

OUT

8.8k

16

6.6k

1.31k

13

12

1.5k

50µA

18

19

17

1.5k

50µA

10

1.87k

SR00509

Figure 7.

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

12

GENERAL APPLICATIONS CIRCUIT

MIXER

+–

SR01730

108764321 5 9

20 19 18 17 16 14

13 12 11

15

RSSI

LO

OSC

OUT

C9

R1

C7

V

CC

C4

C1

C18 C17

C22

RF

INPUT

LIMITER

OSCILLATOR

+–

R2

IF
AMP

C11

C12

LIMITER

OUT(–)

LIMITER

OUT(+)

POWER

DOWN

RSSI

R3

C14

C15

R5

R4

C13

BUFF

RSSI BUFF

RSSI FB

Component List

R2 and R3 set the RSSI buffer gain. For unity gain short R2 (Pin 7 to Pin 8)
and leave R9 open.

R8

C20

L3

R7 R6

L1

C3

C23

C24

FLT1 FLT2

R15

R16

R14

R13

R12

R11

R10

R9

C21

C19

C16

C25

R18

R17

R19

C5

C10

C8

L2

C6

C2

NOTE:

5
1

3

4

3

4

1

LO

INPUT

2

5

2

C1 5–30pF C11 0.1mF C21 10nF R1 10KW R13 240W L1 180nH
C2 5–30pF C12 6.8pF C22 0.1mFR20W (short) R14 4.5KW L2 180nH
C3 0.1mF C13 0.1mF C23 0.1mF R3 OPEN R15 180W L3 56mH
C4 0.1mF C14 30pF C24 10nF R4 5.1k R16 180W FLT1,2 600kHz
C5 0.1mF C15 30pF C25 10nF R5 5.1k R17 240W
C6 0.1mF C16 0.1mFR60W (short) R18 10KW
C7 47pF C17 0.1mF R7 1.5KW R19 10KW
C8 1nF C18 0.1mF R8 1.5KW
C9 10pF C19 10nF R9 180W

C10 3.9pF C20 1500pF R10 180W

R11 10KW
R12 0KW

GND

Figure 8.

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

13

TSSOP20: plastic thin shrink small outline package; 20 leads; body width 4.4 mm SOT360-1

Philips Semiconductors Product specification

SA647Low-voltage digital IF receiver

1998 Aug 10

14

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.

Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, 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 [phone]

 Copyright Philips Electronics North America Corporation 1998

All rights reserved. Printed in U.S.A.

Date of release: 08-98

Document order number: 9397 750 04241

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Data sheet
status

Objective
specification

Preliminary
specification

Product
specification

Product
status

Development

Qualification

Production

Definition

[1]

This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.

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.

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.

Data sheet status

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