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SSTX4930
Low Power ISM-Band FM/FSK Transmitter Description
The SSTX4930 is a low-power 433/868/915 MHz FM/FSK transmitter IC suitable for use in the North American 915 MHz and European 433 and 868 MHz ISM bands. The SSTX4930 is intended as a phase-locked frequency source in local oscillator or transmitter applications.
Features
! Integrated VCO with multi-modulus / 64/65/128/129 prescaler, phase/frequency detector, and reference oscillator forming complete phase-locked loop ! Transmitter enable pin for power saving ! 2.7V to 5V supply voltage ! On-chip varactor diode for narrowband modulation ! SSOP-16 package (0.64mm pitch)
Applications
! Wireless mouse ! Wireless amplifier/ speaker/ headphone/ microphone ! Wireless car alarm system
Block Diagram
Pin Out Diagram
NC VREFP DO
RES
MOD RES IN
SW
MC
16
15
14
CHARGE PUMP
13
VCO
12
11
10
9
OSCIN OSCOUT VSS1 TXOUT
1
16
NC VREFP DO RES MODIN RES SW MC
SSTX4930
2 3 4 5 6 7 8
15 14 13 12 11 10 9
/ 64/65/128/129
PFD
VCC VSS TXEN NC
REF OSC
BIAS PA
1
OSC IN
2
3
4
5
6
7
8
NC
OSC VSS1 OUT
TX VCC OUT
VSS TXEN
Rev.2.01 6/26/2003
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SSTX4930
Pin Descriptions
Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Name OSCIN OSCOUT VSS1 TXOUT VCC VSS TXEN NC MC SW RES MODIN RES DO VREFP NC
I/O I O GND O POWER GND I NC I I I/O I I/O O O NC
Description Connected directly to the reference oscillator transistor base. Connected directly to the emitter of the reference oscillator transistor. Ground for TXOUT. Buffered output of the VCO. DC power supply. Ground. Power-down control for all circuitry. When this pin is a logic "low", all circuits are turned off. Not internally connected. Selects the prescaler modulus. A logic "high" selects 64 or 128 for the prescaler divisor. A logic "low" selects 65 or 129 for the divisor. Select the desired prescaler divisor. A logic "high" selects the 64/65 divisor. A logic "low" selects the 128/129 divisor. Supply DC voltage to the VCO, as well as to tune the center frequency of the VCO. FM analog or digital modulation can be imparted to the VCO through this pin. See Pin 11. Output of the charge pump. An RC network from this pin to ground is used to establish the PLL bandwidth. Bias voltage reference pin for bypassing the prescaler and phase detector. Not internally connected.
Rev.2.01 6/26/2003
www.SiliconStandard.com
2 of 6
SSTX4930
Absolute Maximum Ratings
VSS = VSS1 = 0 V
Parameter Supply Voltage Operating Temperature Range Storage Temperature Range Soldering Temperature Range Soldering Time Range Symbol VCC TOPR TSTG TSLD tSLD Rating 2.2 to 6 -40 to 85 -40 to 150 255 10 Unit V
C C C
s
Recommended Operating Conditions
VSS = VSS1 = 0 V
Value Parameter Supply Voltage Range Operating Temperature Symbol min. VCC TA 2.7 -10 typ. 3.6 25 max. 5.0 60 V Unit
C
Electrical Characteristics
(VCC = 2.7 to 5V, VSS = VSS1 = 0V, TXEN = high, TA = -10 to 60C, fRF = 915MHz unless otherwise noted)
Value Parameter VCC Supply Voltage Total Consumption Current Power-down ICC Output Power Phase Noise Harmonics Crystal Frequency Spurs Charge Pump Current Pout Vcc = 3.3V Offset 10KHz, 5KHz loop BW with output matching 5KHz loop BW -40 -3 -80 -27 -50 40 Symbol VCC ICC Vcc = 3.3V Condition min. 2.2 typ. 3 12.5 max. 5 14 1 V mA A dBm
dBc/Hz
Unit
dBm dBc A
Rev.2.01 6/26/2003
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3 of 6
SSTX4930
Application Circuit (915 MHz)
(FM/FSK Transmitter)
VCC 47P
10N SW 100N 1K 5.6 P 33N 3.3N *1 3.3N *1: Alpha IND SMV 1233-011 10N 10K MC MOD IN
16
15
14
13
RES
12
11
10
SW
9
MC
NC VREFP DO
MOD RES IN
OSC IN
OSC TX OUT VSS1 OUT VCC
VSS TXEN
NC
1
100P
2
100P
3
4
100P
5
10N
6
7
8
7.15909MHz
3.3N 47P TX OUT VCC 50 Ohm
TXEN
Rev.2.01 6/26/2003
www.SiliconStandard.com
4 of 6
SSTX4930
Application Circuit (915 MHz)
(Audio Transmitter)
VCC 47P
10N SW 100N 1K *1 33N 3.3N 5.6 P 3.3N 10N 10K *1: Alpha IND SMV 1233-011 MC
16
15
14
13
RES
12
11
10
SW
9
MC
NC VREFP DO
MOD RES IN
OSC IN
OSC TX OUT VSS1 OUT VCC
VSS TXEN
NC
1
100P 47K AUDIO 22P 7.15909MHz
2
100P
3
4
100P
5
10N
6
7
8
3N Infineon BB833 TX OUT 50 Ohm
47P VCC
TXEN
Rev.2.01 6/26/2003
www.SiliconStandard.com
5 of 6
SSTX4930
Package and Pin Assignment: SSOP-16
OSCIN OSCOUT VSS1 TXOUT VCC VSS TXEN NC
1
16
NC VREFP DO RES MODIN RES SW MC
SSTX4930
2 3 4 5 6 7 8
15 14 13 12 11 10 9
Dimensions in mm Symbols min. A A1 A2 b C D E E1 e L y 1.35 0.10 nom. 1.60 max. 1.75 0.25 min. 0.053 0.004
Dimensions in inch nom. 0.064 max. 0.069 0.010
--
1.45 0.25
--
0.057 0.010
--
0.20 0.19 4.80 5.80 3.80
--
0.30 0.25 5.00 6.20 4.00
--
0.008 0.007 0.189 0.228 0.150
--
0.012 0.010 0.197 0.244 0.157
-- -- -- --
0.64
-- -- -- --
0.025
--
0.40
--
1.27 0.10 8
--
0.016
--
0.050 0.004 8
-- -- --
-- -- --
--
0
--
0
Information furnished by Silicon Standard Corporation is believed to be accurate and reliable. However, Silicon Standard Corporation makes no guarantee or warranty, express or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no responsibility for its use, or for infringement of any patent or other intellectual property rights of third parties that may result from its use. Silicon Standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including without limitation enhancement in reliability, functionality or design. No license is granted, whether expressly or by implication, in relation to the use of any products described herein or to the use of any information provided herein, under any patent or other intellectual property rights of Silicon Standard Corporation or any third parties.
Rev.2.01 6/26/2003
www.SiliconStandard.com
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