AMIS-50051: Digital Demodulator Data Sheet Wireless Products 1.0 Introduction The AMIS-50051 is a small digital demodulator, specially developed to work with the AMIS-50050 spread spectrum baseband controller. It simplifies the design of the receiver in a direct sequence spread spectrum wireless communication link. 2.0 Key Features • • • • • 1Mbit/s demodulation (QPSK) PN code tracking output to AMIS-50050 (Please refer to the AMIS-50050 spread spectrum baseband controller.) Fully programmable CMOS technology Power-down mode 3.0 Applications • • • • Wireless local area networks Portable wireless communication Digital cellular telephones Wireless ISDN modems The AMIS-50051 simplifies the design of the receiver in a direct sequence spread spectrum wireless communication link. The AMIS50051 uses advanced DSP technology to demodulate the data from a BPSK/DBPSK/QPSK/DQPSK modulated signal. This technique also provides a PN code tracking signal output, a carrier tracking signal and an automatic gain control (AGC) output signal. The power of the AMIS-50051 reduces the complexity and component count of a DSSS receiver. The AMIS-50051 is designed to demodulate QPSK or BPSK data from a carrier whose frequency is11MHz or less. Data rates can be as high as 1Mbit/s for QPSK signals or 500Kbit/s for BPSK signals. An error signal is produced, which can be used to acquire and track the PN code of a direct sequence spread spectrum system. This output is a voltage, which the AMIS-50050 (please refer to AMIS-50050 spread spectrum baseband controller) uses to change the phase of the receiver’s PN code. An external despreading device is required to remove the PN code from the received signal. This reduces the chance of false acquisition over other methods. The AMIS-50051’s internal NCO oscillator is adjusted by a signal produced from the data demodulation process. This is used to track variations in the carrier frequency of the received signal. The AMIS-50051 produces a level error output. This output is pulsed high or low depending on the level of the received signal. This can be used to form an AGC circuit. The AMIS-50051 requires few external components. The AMIS-50051 is designed to work directly with the AMIS-50050 to simplify the design effort of a wireless communication link. AMI Semiconductor – Sept. 06 www.amis.com 1 AMIS-50051: Digital Demodulator Data Sheet Wireless Products 4.0 AMIS-50051 Block Diagram Figure 1: Block Diagram of AMIS-50051 AMI Semiconductor – Sept. 06 www.amis.com 2 AMIS-50051: Digital Demodulator Data Sheet Wireless Products 5.0 Package Availability • 24 pin SOIC • 32 pin TQFP Figure 2: Package Availability Table 1: Pin Descriptions Pin Name Number on 24 Pin SOIC DVDD DVSS SDATA SCLK RSSI2 RSSI1 RXD0 RXD1 TRACKON DUMP LPF CRYST1 CRYST0 1,12 2,11 3 4 5 6 7 8 9 10 15 16 17 Number on 32 Pin TQFP 11, 30 10, 31 32, 1 2 3 6 7 8 9 16 17 18 EXT_IN 18 19 RES AGC 19 20 22 23 RX_IN 21 24 ENABLE AVDD AVSS 24 13,23 14,22 27 26 25 4, 5, 12, 13, 20, 21, 28, 29 NC AMI Semiconductor – Sept. 06 www.amis.com Functional Description Type Digital power Digital ground Data for serial programming interface Clock for serial programming interface, sensitive to rising edge RSSI 2 for AMIS-50050 RSSI 1 for AMIS-50050 Received data Bit 0 Received data Bit 1 Indicates that the AMIS-50050 is tracking the incoming signal, active high Activate and dump control logic input PLL phase detector output, internal VCO output Crystal oscillator or external reference input Crystal oscillator Used as digital input from external window comparator, test input not for normal use Active low reset Automatic gain control IF signal input, can also be used as digital input from external window comparator Active low enable for serial programming interface Analog power Analog ground Power Ground Input Output Output Output Output Output Input Input Analog Crystal OSC/Input Crystal OSC Input Input Output Analog/Input Input Power Ground Not connected 3 AMIS-50051: Digital Demodulator Data Sheet Wireless Products 6.0 Electrical Specifications 6.1 Absolute Maximum Ratings Table 2: Absolute Maximum Ratings Parameter Min. Max. Units VDD/AVDD -0.3 5.5 V Input pin voltage, all pins -0.3 VDD+0.3 V Input pin current, all pins -10 10 mA Storage temperature -55 125 Lead temperature o C o 300 C for 10 seconds Note: Stresses beyond those listed under “Absolute Maximum Ratings” may cause damage to the device. This is a stress rating only and functional operation of the device at these, or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 6.2 Operational Characteristics Table 3: Operational Characteristics Symbol Parameter Min. Max. Units 5 V mA mA (1) 11 MHz (2) 25 MHz VDD ICC ICC Supply voltage Supply current (5V) Supply current (3V) IFI IF frequency IFE IF frequency RXiv Input voltage RXii Input impedance Fref Reference frequency Rsol RSSI 1&2 output level Srte Internal sample rate Notes: (1) (2) (3) Typ. 3 18 8 200 (3) 300 kΩ 2 MHz 0 2.5 V 1.56 100 MHz Using the internal A to D converter Using an external A to D converter Impedance for only the RXin pin AMI Semiconductor – Sept. 06 www.amis.com mVpp 100 4 AMIS-50051: Digital Demodulator Data Sheet Wireless Products 6.3 Supply Current for 5V Operation Figure 3: Supply Current for 5V Operation Note: The frequency in MHz is the frequency of the internal clock, Fvco. 6.4 Supply Current for 3V Operation Figure 4: Supply Current for 3V Operation Note: The frequency in MHz is the frequency of the internal clock, Fvco. AMI Semiconductor – Sept. 06 www.amis.com 5 AMIS-50051: Digital Demodulator Data Sheet Wireless Products 6.5 AMIS-50051 Programming Interface The AMIS-50051 uses a 3-wire interface, enable/clock and data. The enable is active low. Figure 5: Active Enable Mode Timing Table 4: Active Enable Timing Specifications Parameter Typical Slow Mode Typical Fast Mode Units tLE 16 0.500 µsec tH 12 0.125 µsec tSU 4 0.125 µsec tPULSE 8 0.250 µsec tLEH 8 0.250 µsec Note: The AMIS-50051 uses the three wire serial interface for programming. The protocol used is the “Active Enable” mode with a slow clock and enable active low. 6.6 Typical AMIS-50050 to AMIS-50051 Code It is recommended to program the AMIS-50051 via the AMIS-50050. AMIS applications notes to support customer programming are available. AMI Semiconductor – Sept. 06 www.amis.com 6 AMIS-50051: Digital Demodulator Data Sheet Wireless Products 7.0 AMIS-50051 Ordering Codes Table 5: Ordering Codes Device Number Package 11564-502-XTP (or –XTD) 24 Lead SOIC 11564-503-XTP (or –XTD) 32 Lead LQFP 32 Lead LQFP (green/RoHS) 11564-504-XTP (or –XTD) Note: XTP – tape and reel. XTD – tube/tray 8.0 Company or Product Inquiries For more information about AMI Semiconductor, our technology and our product, visit our Web site at: http://www.amis.com. North America Tel: +1.208.233.4690 Fax: +1.208.234.6795 Europe Tel: +32 (0) 55.33.22.11 Fax: +32 (0) 55.31.81.12 Devices sold by AMIS are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. AMIS makes no warranty, express, statutory, implied or by description, regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. AMIS makes no warranty of merchantability or fitness for any purposes. AMIS reserves the right to discontinue production and change specifications and prices at any time and without notice. AMI Semiconductor's products are intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not recommended without additional processing by AMIS for such applications. Copyright ©2006 AMI Semiconductor, Inc. AMI Semiconductor – Sept. 06 www.amis.com 7