INTEGRATED CIRCUITS
SA647
Low-voltage digital IF receiver
Product specification
1998 Aug 10
Philips
Semiconductors
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
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.
APPLICATIONS
•
NADC (North American Digital Cellular)
•
Digital receiver systems
•
Cellular radio
PIN CONFIGURATION
RF
IN+
1
20 MIX
OUT
19 IF AMP
DECOUP
18 IF AMP
IN
17 IF AMP
DECOUP
16 IF AMP
OUT
15 GND
14 LIM
IN
13 LIM
DECOUP
12 LIM
DECOUP
11 LIM OUT (+)
FEATURES
•
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
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Thin Shrink Small Outline Package (Surface-mount)
RF
IN–
2
OSC E 3
OSC B 4
OSC
BUF
OUT 5
V
CC
6
RSSI 7
RSSI FB 8
P
D
9
LIM OUT (-) 10
SR01456
Figure 1.
Pin Configuration
TEMPERATURE RANGE
–40 to +85°C
ORDER CODE
SA647DH
DWG #
SOT360–1
20
19
18
17
16
15
14
13
12
11
GND
IF
AMP
MIXER
OSCILLATOR
FAST RSSI
+ –
+ –
POWER
DOWN
LIMITER
E
1
2
3
4
B
5
V
CC
6
7
8
9
10
SR01727
Figure 2.
Block Diagram
1998 Aug 10
2
853–2037 19849
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
RF
IN
RF BYPASS
OSC
E
OSC
B
OSC
BUF
OUT
V
CC
RSSI
RSSI FB
P
D
LIM
OUT(–)
LIM
OUT(+)
LIM
DECOUP
LIM
DECOUP
LIM
IN
GND
IF AMP
OUT
IF AMP
DECOUP
IF AMP
IN
IF AMP
DECOUP
MIX
OUT
SYMBOL
RF input
RF bypass
Oscillator emitter
Oscillator base (input)
Oscillator buffer output
Supply voltage
RSSI output
RSSI Feedback
Power Down
Limiter output (neg)
Limiter output (pos)
Limiter decoupling
Limiter decoupling
Limiter input
Ground
IF amplifier output
IF amplifier decoupling
IF amplifier input
IF amplifier decoupling
Mixer output
FUNCTION
1998 Aug 10
3
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
ABSOLUTE MAXIMUM RATINGS
SYMBOL
V
CC
V
IN
T
STG
T
A
Supply voltage
Voltage applied to any other pin
Storage temperature range
Operating ambient temperature range
PARAMETER
RATING
-0.3 to +6.0
-0.3 to (V
CC
+ 0.3)
-65 to +150
-40 to +85
UNITS
V
V
NOTE:
Thermal impedance (θ
JA
) = 135
°
C/W
°
C
°
C
DC ELECTRICAL CHARACTERISTICS
V
CC
= +3.0V, T
A
= 25
°
C; unless otherwise stated.
SYMBOL
V
CC
I
CC
PARAMETER
Power supply voltage range
DC current drain
Standby
Input current
Input level
τ
on
τ
off
Power–up time
Power–down time
Pin 9 = LOW
Pin 9 = LOW
Pin 9 = HIGH
Pin 9 = LOW
Pin 9 = HIGH
RSSI valid (10% to 90%)
RSSI valid (90% to 10%)
-10
-10
0
0.7 V
CC
10
5
TEST CONDITIONS
LIMITS
MIN
2.7
4
5.3
0.11
10
10
0.3V
CC
V
CC
TYP
MAX
5.5
7
UNITS
V
mA
mA
µA
V
msec
msec
1998 Aug 10
4
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
AC ELECTRICAL CHARACTERISTICS
SYMBOL
Mixer/Osc section
f
IN
f
OSC
NF
IIP3
G
CP
R
IN
C
IN
R
OUT
I
SOL
Input signal frequency
Crystal oscillator frequency
Noise figure at 110.52MHz
Third-order input intercept point
Conversion power gain
Mixer input resistance
Mixer input capacitance
Mixer output resistance
Mixer RF to LO isolation
PARAMETER
V
CC
= +3.0V, Mixer input freq = 110.52MHz, LO input freq = 109.92MHz, T
A
= 25
°
C; unless otherwise stated.
TEST CONDITIONS
LIMITS
MIN
TYP
MAX
200
200
Matched input and output 50Ω
Matched input and output to 50Ω
Matched input and output to 50Ω
at 110.52 MHz
at 110.52 MHz
at 600 kHz
10kII3.9pF load
f = 110.52 MHz at Pin 4
Matched input and output 50W
110
250
30
51
Input power level = -113dBm, Pin 1
Input power level = -68dBm, Pin 1
Input power level = -29dBm, Pin 1
RSSI range
RSSI accuracy
RSSI ripple
RSSI speed – (Rise Time)
Input @ Pin 1
RSSI speed – (Fall time)
Input @ Pin 1
IF input impedance
IF output impedance
Limiter input impedance
Limiter output impedance
Limiter output (each pin)
Limiter output DC level
Differential output matching
Limiter output offset
(Pin 10, Pin 11)
Output load is 1.5K in parallel with 30
pF to GND each pin
240
No filter
No filter
36
60
2
0.30
1.00
1.55
85
±1.5
30
5
25
1.5
1.5
1.5
230
350
1.27
±5
0.09
420
17
4.5
-29.5
20
670
3.0
1.5
32
230
320
23
UNITS
MHz
MHz
dB
dBm
dB
Ω
pF
kΩ
dB
mV
P–P
mV
P–P
dB
dB
MHz
V
V
V
dB
dB
mV
P–P
µs
µs
kΩ
kΩ
kΩ
Ω
mV
P–P
V
mV
V
Buffered LO output level, DC coupled
External input level
IF section
IF amp power gain
Limiter power gain
IF
BW
IF amp bandwidth
RSSI output
1998 Aug 10
5
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