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 NC VREFP DO 16 15 14 MOD RES IN RES 13 12 11 VCO SW MC 10 9 ÷ 64/65/128/129 OSCIN 1 OSCOUT 2 VSS1 3 TXOUT 4 VCC 5 VSS 6 TXEN 7 NC 8 PFD BIAS REF OSC 1 OSC IN Rev.2.01 6/26/2003 2 3 OSC VSS1 OUT PA 4 5 TX VCC OUT 6 7 VSS TXEN 8 SSTX4930 CHARGE PUMP Pin Out Diagram 16 NC 15 VREFP 14 DO 13 RES 12 MODIN 11 RES 10 SW 9 MC NC www.SiliconStandard.com 1 of 6 SSTX4930 Pin Descriptions Number Name I/O 1 OSCIN I Connected directly to the reference oscillator transistor base. 2 OSCOUT O Connected directly to the emitter of the reference oscillator transistor. 3 VSS1 GND 4 TXOUT O 5 VCC POWER 6 VSS GND 7 TXEN I 8 NC NC 9 MC I 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. 10 SW I Select the desired prescaler divisor. A logic “high” selects the 64/65 divisor. A logic “low” selects the 128/129 divisor. 11 RES I/O Supply DC voltage to the VCO, as well as to tune the center frequency of the VCO. 12 MODIN I FM analog or digital modulation can be imparted to the VCO through this pin. 13 RES I/O 14 DO O Output of the charge pump. An RC network from this pin to ground is used to establish the PLL bandwidth. 15 VREFP O Bias voltage reference pin for bypassing the prescaler and phase detector. 16 NC NC Rev.2.01 6/26/2003 Description 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. See Pin 11. Not internally connected. www.SiliconStandard.com 2 of 6 SSTX4930 Absolute Maximum Ratings VSS = VSS1 = 0 V Parameter Symbol Rating Unit Supply Voltage VCC 2.2 to 6 V Operating Temperature Range TOPR –40 to 85 °C Storage Temperature Range TSTG –40 to 150 °C Soldering Temperature Range TSLD 255 °C Soldering Time Range tSLD 10 s Recommended Operating Conditions VSS = VSS1 = 0 V Value Parameter Symbol Unit min. typ. max. Supply Voltage Range VCC 2.7 3.6 5.0 V Operating Temperature TA –10 25 60 °C Electrical Characteristics (VCC = 2.7 to 5V, VSS = VSS1 = 0V, TXEN = high, TA = –10 to 60°C, fRF = 915MHz unless otherwise noted) Value Parameter Symbol VCC Supply Voltage VCC Total Consumption Current ICC Condition Unit min. typ. max. 2.2 3 5 V 12.5 14 mA 1 µA Vcc = 3.3V Power-down ICC Output Power Pout Vcc = 3.3V –3 dBm Phase Noise Offset 10KHz, 5KHz loop BW –80 dBc/Hz Harmonics with output matching –27 dBm 5KHz loop BW –50 dBc Crystal Frequency Spurs Charge Pump Current Rev.2.01 6/26/2003 –40 www.SiliconStandard.com 40 µA 3 of 6 SSTX4930 Application Circuit (915 MHz) (FM/FSK Transmitter) VCC 47P 10N SW 100N 10N MC MOD IN 10K 1K *1 5.6 P 14 13 NC VREFP DO RES OSC IN 15 12 100P 2 3 100P 4 5 100P 10 SW VSS TXEN 6 9 MC NC 7 8 10N 3.3N 47P TX OUT VCC 50 Ohm Rev.2.01 6/26/2003 11 MOD RES IN OSC TX OUT VSS1 OUT VCC 1 7.15909MHz 3.3N 3.3N 33N 16 *1: Alpha IND SMV 1233-011 TXEN www.SiliconStandard.com 4 of 6 SSTX4930 Application Circuit (915 MHz) (Audio Transmitter) VCC 47P 10N SW 100N 10N MC 10K 1K *1: Alpha IND SMV 1233-011 *1 16 14 13 NC VREFP DO RES OSC IN 15 3.3N 5.6 P 3.3N 33N 12 MOD RES IN OSC TX OUT VSS1 OUT VCC 1 100P 2 3 100P 11 4 SW VSS TXEN 5 100P 10 6 7 9 MC NC 8 10N 47K AUDIO 22P 7.15909MHz 3N Infineon BB833 Rev.2.01 6/26/2003 TX OUT 50 Ohm 47P VCC TXEN www.SiliconStandard.com 5 of 6 SSTX4930 Package and Pin Assignment: SSOP-16 1 OSCOUT 2 VSS1 3 TXOUT 4 VCC 5 VSS 6 TXEN 7 NC 8 SSTX4930 Dimensions in mm OSCIN 16 NC 15 VREFP 14 DO 13 RES 12 MODIN 11 RES 10 SW 9 MC Dimensions in inch Symbols min. nom. max. min. nom. max. A 1.35 1.60 1.75 0.053 0.064 0.069 A1 0.10 — 0.25 0.004 — 0.010 A2 — 1.45 — — 0.057 — b 0.20 0.25 0.30 0.008 0.010 0.012 C 0.19 — 0.25 0.007 — 0.010 D 4.80 — 5.00 0.189 — 0.197 E 5.80 — 6.20 0.228 — 0.244 E1 3.80 — 4.00 0.150 — 0.157 e — 0.64 — — 0.025 — L 0.40 — 1.27 0.016 — 0.050 y — — 0.10 — — 0.004 θ 0° — 8° 0° — 8° 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 6 of 6