Philips
Semiconductors
SA647
Low-voltage digital IF receiver
Product specification
1998 Aug 10
INTEGRATED CIRCUITS
Philips Semiconductors
Product specification
SA647
Low-voltage digital IF receiver
2
1998 Aug 10
8532037 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.
FEATURES
V
CC
= 2.7 to 5.5V
Low power receiver (5.3mA @ 3V)
Power down mode (I
CC
= 110
A)
Fast RSSI rise and fall times
Extended RSSI range with temperature compensation
RSSI op amp
2MHz limiter small signal bandwidth
Filter matching (1.5k
)
Differential limiter output
Oscillator buffer
TSSOP-20 package
APPLICATIONS
NADC (North American Digital Cellular)
Digital receiver systems
Cellular radio
PIN CONFIGURATION
SR01456
MIX
OUT
IF AMP
IN
GND
LIM
IN
LIM OUT (+)
RFIN+
RFIN
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 (-)
VCC
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
SOT3601
SR01727
OSCILLATOR
MIXER
+
IF
AMP
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
E
B
LIMITER
VCC
GND
FAST RSSI
+
POWER
DOWN
Figure 2.
Block Diagram
Philips Semiconductors
Product specification
SA647
Low-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
SA647
Low-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 (V
CC
+ 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 (
JA
) = 135
C/W
DC ELECTRICAL CHARACTERISTICS
V
CC
= +3.0V, T
A
= 25
C; unless otherwise stated.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNITS
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
A
Pin 9 = HIGH
-10
10
A
Input level
Pin 9 = LOW
0
0.3V
CC
V
Pin 9 = HIGH
0.7 V
CC
V
CC
V
on
Powerup time
RSSI valid (10% to 90%)
10
m
sec
off
Powerdown time
RSSI valid (90% to 10%)
5
m
sec
Philips Semiconductors
Product specification
SA647
Low-voltage digital IF receiver
1998 Aug 10
5
AC ELECTRICAL CHARACTERISTICS
V
CC
= +3.0V,
Mixer input freq = 110.52MHz, LO input freq = 109.92MHz, T
A
= 25
C; unless otherwise stated.
SYMBOL
PARAMETER
TEST CONDITIONS
LIMITS
UNITS
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 50
4.5
dB
IIP3
Third-order input intercept point
Matched input and output to 50
-29.5
dBm
G
CP
Conversion power gain
Matched input and output to 50
17
20
23
dB
R
IN
Mixer input resistance
at 110.52 MHz
670
C
IN
Mixer input capacitance
at 110.52 MHz
3.0
pF
R
OUT
Mixer output resistance
at 600 kHz
1.5
k
I
SOL
Mixer RF to LO isolation
32
dB
Buffered LO output level, DC coupled
10kII3.9pF load
110
230
320
mV
PP
External input level
f = 110.52 MHz at Pin 4
250
mV
PP
IF section
IF amp power gain
Matched input and output 50
W
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
PP
RSSI speed (Rise Time)
Input @ Pin 1
No filter
5
s
RSSI speed (Fall time)
Input @ Pin 1
No filter
25
s
IF input impedance
1.5
k
IF output impedance
1.5
k
Limiter input impedance
1.5
k
Limiter output impedance
(Pin 10, Pin 11)
230
Limiter output (each pin)
Output load is 1.5K in parallel with 30
pF to GND each pin
240
350
420
mV
PP
Limiter output DC level
1.27
V
Differential output matching
5
mV
Limiter output offset
0.09
V
Philips Semiconductors
Product specification
SA647
Low-voltage digital IF receiver
1998 Aug 10
6
CIRCUIT DESCRIPTION
Mixer
The mixer has a singleended input. The input impedance is 670
in parallel with a 3.0pF cap at 110.52MHz RF. The mixer output can
drive a 1500
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 1500
. 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
SA647
Low-voltage digital IF receiver
1998 Aug 10
7
PERFORMANCE CHARACTERISTICS
V
CC
= +3.0V,
Mixer input freq = 110.52MHz, LO input freq = 109.92MHz, T
A
= 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 (mVpp)
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 (mVpp)
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 = 10K
W
3.9pF
5.1K
W
10K
W
Figure 3.
Philips Semiconductors
Product specification
SA647
Low-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 Voltage
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 Voltage
0.04
0.05
0.06
0.07
0.08
0.09
0.10
0.11
0.12
0.13
0.14
40
0
25
70
85
Offset (V
olt)
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
40
0
25
70
85
Output (mVpp)
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 (V
olt)
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 (V
olt)
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
SA647
Low-voltage digital IF receiver
1998 Aug 10
9
GENERAL TEST CIRCUIT DESCRIPTION
C1
0.01
m
F
C11
100nF
C21
0.01
m
F
R1
249
W
R13
50
W
R24
8.66
W
L1
120nH
C2
12pF
C12
100nF
C22
0.1
m
F
R2
60.4
W
R14
13.7
W
R25
130
W
L2
120nH
C3
39pF
C13
30pF
C23
100nF
R3
60.4
W
R
1
5
1.5K
W
R26
182
W
L3
56
m
H
C4
0.01
m
F
C14
0.1
m
F
C24
0.1
m
F
R4
10K
W
R16
1.5K
W
R27
182
W
FLT 600kHz
C5
15pF
C15
30pF
C25
0.1
m
F
R5
10K
W
R17
1K
W
R28
10K
W
C6
39pF
C16
100nF
C26
100nF
R6
10K
W
R18
13.7K
W
R29
10K
W
C7
3.9pF
C17
100nF
C27
0.1
m
F
R7
10K
W
R19
50K
W
R30
3.92K
W
C8
0.1
m
F
C18
0.1
m
F
C28
0.1
m
F
R8
10K
W
R20
1.69K
W
C9
100nF
C19
270pF
R9
10K
W
R21
2.43K
W
C10
100nF
C20
1500pF
R10
1.5K
W
R22
50
W
R11
1.5K
W
R23
130
W
R12
1.69K
W
SR01728
10
9
8
7
6
5
4
3
2
1
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 BYP
ASS
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
VCC
RSSI
OUT
Figure 5.
Philips Semiconductors
Product specification
SA647
Low-voltage digital IF receiver
1998 Aug 10
10
1
4
3
18k
MIX
150
A
6
VREF
BANDGAP
8
+
VCC
--
7
VCC
+
--
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
6
V
CC
+3.00
5
150
A
5
OSC
+2.21
BUFFER
SR01729
2
RF BYPASS
RF IN
26
30K
400
Figure 6.
Philips Semiconductors
Product specification
SA647
Low-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
DECOUP
DECOUP
13
LIMITER
+1.28
18
IF
+1.28
AMP IN
COUPLING
14
LIMITER
+1.28
19
IF AMP
+1.28
DECOUP
IN
15
GND
0
20
MIXER
+2.03
OUT
OUT
8.8k
16
6.6k
1.31k
13
12
1.5k
50
A
18
19
17
1.5k
50
A
10
1.87k
SR00509
Figure 7.
Philips Semiconductors
Product specification
SA647
Low-voltage digital IF receiver
1998 Aug 10
12
GENERAL APPLICATIONS CIRCUIT
MIXER
+
SR01730
10
8
7
6
4
3
2
1
5
9
20
19
18
17
16
14
13
12
11
15
RSSI
LO
OSC
OUT
C9
R1
C7
VCC
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
R1
1
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
530pF
C11
0.1
m
F
C21
10nF
R1
10K
W
R13
240
W
L1
180nH
C2
530pF
C12
6.8pF
C22
0.1
m
F
R2
0
W
(short)
R14
4.5K
W
L2
180nH
C3
0.1
m
F
C13
0.1
m
F
C23
0.1
m
F
R3
OPEN
R
1
5
180
W
L3
56
m
H
C4
0.1
m
F
C14
30pF
C24
10nF
R4
5.1k
R16
180
W
FLT1,2
600kHz
C5
0.1
m
F
C15
30pF
C25
10nF
R5
5.1k
R17
240
W
C6
0.1
m
F
C16
0.1
m
F
R6
0
W
(short)
R18
10K
W
C7
47pF
C17
0.1
m
F
R7
1.5K
W
R19
10K
W
C8
1nF
C18
0.1
m
F
R8
1.5K
W
C9
10pF
C19
10nF
R9
180
W
C10
3.9pF
C20
1500pF
R10
180
W
R11
10K
W
R12
0K
W
GND
Figure 8.
Philips Semiconductors
Product specification
SA647
Low-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
SA647
Low-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 940883409
Telephone 800-234-7381
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
Philips
Semiconductors
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.
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