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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
RFIN+ 1
20 MIXOUT 19 IF AMP DECOUP 18 IF AMPIN 17 IF AMPDECOUP 16 IF AMPOUT 15 GND 14 LIMIN 13 LIMDECOUP 12 LIMDECOUP 11 LIM OUT (+)
FEATURES
* VCC = 2.7 to 5.5V * Low power receiver (5.3mA @ 3V) * Power down mode (ICC = 110A) * 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
ORDERING INFORMATION
DESCRIPTION 20-Pin Plastic Thin Shrink Small Outline Package (Surface-mount)
RFIN- 2 OSC E 3 OSC B 4 OSCBUF OUT 5 VCC 6 RSSI 7 RSSI FB 8 PD 9 LIM OUT (-) 10
SR01456
Figure 1.
Pin Configuration
TEMPERATURE RANGE -40 to +85C
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
VCC 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 RFIN RF BYPASS OSCE OSCB OSCBUFOUT VCC RSSI RSSI FB PD LIMOUT(-) LIMOUT(+) LIMDECOUP LIMDECOUP LIMIN GND IF AMPOUT IF AMPDECOUP IF AMPIN IF AMPDECOUP MIXOUT 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 VCC VIN TSTG TA 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 (VCC + 0.3) -65 to +150 -40 to +85 UNITS V V
C C
NOTE: Thermal impedance (JA) = 135C/W
DC ELECTRICAL CHARACTERISTICS
VCC = +3.0V, TA = 25C; unless otherwise stated. SYMBOL VCC ICC PARAMETER Power supply voltage range DC current drain Standby Input current Input level on 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 VCC 10 5 TEST CONDITIONS LIMITS MIN 2.7 4 5.3 0.11 10 10 0.3VCC VCC TYP MAX 5.5 7 UNITS V mA mA A V msec msec
1998 Aug 10
4
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
AC ELECTRICAL CHARACTERISTICS
VCC = +3.0V, Mixer input freq = 110.52MHz, LO input freq = 109.92MHz, TA = 25C; unless otherwise stated. SYMBOL Mixer/Osc section fIN fOSC NF IIP3 GCP RIN CIN ROUT ISOL 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 Buffered LO output level, DC coupled External input level IF section IF amp power gain Limiter power gain IFBW IF amp bandwidth RSSI output 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 Matched input and output 50W 30 51 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 dB dB MHz V V V dB dB mVP-P s s k k k mVP-P V mV V 10kII3.9pF load f = 110.52 MHz at Pin 4 110 250 Matched input and output 50 Matched input and output to 50 Matched input and output to 50 at 110.52 MHz at 110.52 MHz at 600 kHz 17 4.5 -29.5 20 670 3.0 1.5 32 230 320 23 200 200 MHz MHz dB dBm dB pF k dB mVP-P mVP-P PARAMETER TEST CONDITIONS LIMITS MIN TYP MAX UNITS
1998 Aug 10
5
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
CIRCUIT DESCRIPTION Mixer
The mixer has a single-ended 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.
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.
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.
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 VCCs.
1998 Aug 10
6
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
PERFORMANCE CHARACTERISTICS
VCC = +3.0V, Mixer input freq = 110.52MHz, LO input freq = 109.92MHz, TA = 25C; unless otherwise stated.
Supply Current vs Temperature and Supply Voltage 7.00 6.50 6.00 Current (mA) 3.8V 5.50 5.00 4.50 4.00 3.50 3.00 -40 0 25 Temperature (C) Mixer Gain vs Temperature and Supply Voltage 24.0 23.0 22.0 5.5V 21.0 Gain (dB) 20.0 19.0 18.0 17.0 16.0 15.0 -40 0 25 Temperature (C) 70 85 2.7V IP3 (dBm) 3.0V -25 -26 -27 -28 -29 -30 -31 -32 -33 -40 0 25 Temperature (C) 70 85 2.7V 3.0V 5.5V 70 85 2.7V 3.0V 5.5V Output Power (dBm) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 Input Power (dBm) Mixer 3rd Order Input Intercept Point vs Temperature and Supply Voltage 3rd Order Product Fund. Product Mixer 3rd Order Intercept and Compression vs Input Power
Mixer Noise Figure vs Temperature and Supply Voltage 5.5 Compression (dBm) -36 -37 -38
Mixer 1dB Input Compression vs Temperature and Supply Voltage
Noise Figure (dB)
5.0 5.5V 4.5 3.0V 2.7V 4.0
2.7V -39 -40 5.5V -41 -42 3.0V
3.5 -40 0 25 Temperature (C) 70 85 -40 0 25 Temperature (C) 70 85
LO Buffer Output with Load Variation LO Buffer Output (mVp-p) 550 500 LO Output (mVp-p) 450 400 350 300 250 200 150 100 0 1 2.2 3 3.9 Capacitor Load (pF) 4.7 5.6 10KW 5.1KW 310 290 270 250 230 210 190 170 150 -40
LO Buffer Output vs Temperature and Supply Voltage Load = 10KW 3.9pF 5.5V
3.0V
2.7V
0
25 Temperature (C)
70
85
SR01554
Figure 3.
1998 Aug 10
7
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
IF Bandwidth vs. Temperature 3.4 3.2 Bandwidth (MHz) 3.0 Gain (dB) 2.8 2.6 2.4 2.2 2.0 -40 0 25 Temperature (C) Limiter Output Offset vs Temperature and Supply Voltage 0.14 0.13 Bandwidth (MHz) 0.12 0.11 Offset (Volt) 0.10 0.09 3.0V 0.08 0.07 0.06 0.05 0.04 -40 0 25 Temperature (C) 70 85 2.7V 5.5V 70 85
IF Gain vs Temperature and Supply Voltage 38.5 38.0 37.5 3.0V 37.0 36.5 36.0 35.5 35.0 -40 0 25 Temperature (C) 70 85 2.7V 5.5V
Limiter Bandwidth vs Temperature 2.8 2.6 2.4 2.2 2.0 1.8 1.6 -40 0 25 Temperature (C) 70 85
Limiter Gain vs Temperature and Supply Voltage 65.0 64.5 64.0 Gain (dB) Output (mVp-p) 63.5 63.0 62.5 62.0 61.5 61.0 60.5 60.0 -40C 25 70 Temperature (C) 85 200 -40 2.7V 5.5V 400 450
Limiter Output vs Temperature and Supply Voltage
5.5V 350 3.0V
3.0V
300 2.7V
250
0
25 Temperature (C) RSSI vs Supply Voltage
70
85
RSSI vs Temperature 1.6 1.4 1.2 RSSI (Volt) 1.0 0.8 0.6 0.4 0.2 0.0 -118 -108 85C -40C RSSI (Volt) 25C 1.80 1.60 1.40 1.20 1.00 0.80 0.60 0.40 0.20 -98 -88 -78 -68 -58 -48 -38 -28 0.00 -118 -108 -98
5.5V
3.0V
2.7V
RF Input (dBm)
-88 -78 -68 RF Input (dBm)
-58
-48
-38
-28
SR01555
Figure 4.
1998 Aug 10
8
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
GENERAL TEST CIRCUIT DESCRIPTION
IF OR LIMITER INPUT FLT R29 2 5 R28 MIXER OUT R25 R22 R23 R21 R30 C28 C27 C26 R24 C25 C24 R17 R20 C21 R16 C23 C17 C16 C15 R15 R18 4 R27 3 1 R26 R19 C22 C19 C20 L3 R14 C18 R11 C14 R13 LIMITER OUT (+)
20
MX OUT
19
IF DEC
18
IF IN
17
IF DEC
16
IF OUT
15
GND
14
LIM IN
13
LIM DEC
12
LIM DEC
11
LIM OUT+
IF AMP
MIXER
LIMITER
FAST RSSI OSCILLATOR OSC BUFF RF BYPASS OSC E RSSI FB + OSC B VCC - RSSI OUT
+- RF IN
POWER DOWN
1
C1 L1 C2 C3
2
3
4
5
6
C11
7
R9
8
9
10
C9
C10
C4
C7
LIM OUT - C13
R7 R4 R5 L2 R6 C12
R8 PWD R10
R1
R3
C5
RSSI OUT
C8 VCC C14
R2
C6 LO BUFFER OUTPUT LIMITER OUT (-) LO INPUT
RF INPUT
Automatic Test Circuit Component List C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 0.01mF 12pF 39pF 0.01mF 15pF 39pF 3.9pF 0.1mF 100nF 100nF C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 100nF 100nF 30pF 0.1mF 30pF 100nF 100nF 0.1mF 270pF 1500pF C21 C22 C23 C24 C25 C26 C27 C28 0.01mF 0.1mF 100nF 0.1mF 0.1mF 100nF 0.1mF 0.1mF R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 249W 60.4W 60.4W 10KW 10KW 10KW 10KW 10KW 10KW 1.5KW 1.5KW 1.69KW R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 50W 13.7W 1.5KW 1.5KW 1KW 13.7KW 50KW 1.69KW 2.43KW 50W 130W R24 R25 R26 R27 R28 R29 R30 8.66W 130W 182W 182W 10KW 10KW 3.92KW L1 L2 L3 FLT 120nH 120nH 56mH 600kHz
SR01728
Figure 5.
1998 Aug 10
9
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
PIN PIN DC V No. MNEMONIC
EQUIVALENT CIRCUIT
PIN PIN DC V No. MNEMONIC
EQUIVALENT CIRCUIT
400
1
RF IN
+2.35
30K
6
VREF
6
VCC
+3.00
BANDGAP
RF IN
1
26
RF 2 BYPASS +1.56
RF BYPASS
2 VCC
RSSI 7 OSC 3 E +2.21
4 MIX
OUT
+0.20
+ --
7
18k
VCC 3
OSC 4 B +2.78
150A
RSSI 8 FEEDBACK +0.20
8
--
+
OSC 5 BUFFER +2.21
R
POWER 9
5 150A
DOWN
+2.00
9
R
SR01729
Figure 6.
1998 Aug 10
10
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
PIN PIN DC V No. MNEMONIC
EQUIVALENT CIRCUIT
PIN PIN DC V No. MNEMONIC
EQUIVALENT CIRCUIT
10 LIMITER OUT 11 +1.25
11 8.8k
IF 16 AMP OUT +1.28
1.31k 16 6.6k
LIMITER 12 DECOUP +1.28 17
IF AMP DECOUP +1.28
14
18 1.5k
LIMITER 13 COUPLING +1.28
IF 18
50A
AMP IN
+1.28
1.5k
50A
12 13 19
17
LIMITER 14 IN +1.28 19
IF AMP DECOUP +1.28
1.87k 20
MIXER 15 GND 0 20 OUT +2.03
SR00509
Figure 7.
1998 Aug 10
11
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
GENERAL APPLICATIONS CIRCUIT
FLT1 24 53 1 R17 R18 R19
R15 R11 R12
FLT2 24 53 1
R10
R16
R14 R13
R9 R7 R6 L3 C19 C18 C21 C17 C16
R8 C23
C20
C24
C22
C25
20
19
18
17
16
15
GND
14
13
12
11
IF AMP MIXER OSCILLATOR RSSI RSSI BUFF
LIMITER
R5 +- +- RSSI FB LO BUFF
1
C1
2
C4
3
C5
4
C8
5
C9
6
7
C11 R2
8
9
10
C13
C2 RF INPUT L2 L1 C7 C3 C10 LO INPUT C6 R1 R3 R4 C15
C12 C14
OSC OUT
VCC
RSSI
POWER LIMITER DOWN OUT(-)
LIMITER OUT(+)
Component List C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 5-30pF 5-30pF 0.1mF 0.1mF 0.1mF 0.1mF 47pF 1nF 10pF 3.9pF C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 0.1mF 6.8pF 0.1mF 30pF 30pF 0.1mF 0.1mF 0.1mF 10nF 1500pF C21 C22 C23 C24 C25 10nF 0.1mF 0.1mF 10nF 10nF R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 10KW 0W (short) OPEN 5.1k 5.1k 0W (short) 1.5KW 1.5KW 180W 180W 10KW 0KW R13 R14 R15 R16 R17 R18 R19 240W 4.5KW 180W 180W 240W 10KW 10KW L1 180nH L2 180nH L3 56mH FLT1,2 600kHz
NOTE: R2 and R3 set the RSSI buffer gain. For unity gain short R2 (Pin 7 to Pin 8) and leave R9 open.
SR01730
Figure 8. 1998 Aug 10 12
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
TSSOP20: plastic thin shrink small outline package; 20 leads; body width 4.4 mm
SOT360-1
1998 Aug 10
13
Philips Semiconductors
Product specification
Low-voltage digital IF receiver
SA647
Data sheet status
Data sheet status Objective specification Preliminary specification Product specification Product status Development Qualification 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.
Production
[1] Please consult the most recently issued datasheet before initiating or completing a design.
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 800-234-7381 (c) 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
1998 Aug 10 14

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