Features: ` Complete BPSK/QPSK/16QAM modulator in a CMOS ASIC
` Programmable over a wide range of data rates
` NCO modulator provides fine frequency resolution
` 165 MHz maximum clock rate generates a modulated carrier at frequencies programmable from 5 to 65 MHz
` Operates in continuous and burst modes
` Differential Encoder, Programmable Scrambler, and Programmable Reed-Solomon FEC Encoder
` Programmable 32-tap FIR Filter for signal shaping before modulation
` 10-bit DAC implemented on chip
` Complete upstream modulator solution serial data in and RF signal out
` Compatible with DAVIC, IEEE 802.14 (preliminary), Intelsat IESS-308, ITU J.83 Annex A, MCNS Standards
` Supports low data rates for voice applications and high data rates for wideband applications
` Small Footprint, Surface Mount 80-Pin MQFP Package
Specifications
|
Symbol |
Parameter |
Range |
Units Note 1 |
|
Tstg |
Storage Temperature |
-40 to +125 |
°C |
|
VDDmax |
Supply voltage on VDD |
-0.3 to +4.6 |
volts |
|
AVDDmax |
Supply voltage on AVDD |
-0.3 to +4.6 |
volts |
|
5VDDmax |
Supply voltage on 5VDD |
-0.3 to +7.0 |
volts Note 2 |
|
AVSS |
Analog supply return for AVDD |
±10% of VDD |
volts |
|
VI(max) |
Input voltage |
-0.3 to VDD+0.3 |
volts |
|
Ii |
DC input current |
± 30 |
mA |
|
PDiss (max) |
Power dissipation @ 85oC |
690 |
mW Note 3 |
Note:
1. All voltages are referenced to VSS.
2. 5VDD must be greater than or equal to VDD. This rule can be violated for a maximimum of 100 msec during power up.
3. See Duty Cycle Derating Curves (Figure 15)
DescriptionThe STEL-1109 is comprised of the Data Path and Control Unit sections shown in Figure 1. The Data Path is comprised of a Bit Sync Block, Bit Encoder Block (i.e.,Êthe Scrambler, Reed-Solomon Encoder, and two Multiplexers shown in Figure 2), Symbol Mapper Block (i.e., the Bit Mapper, Differential Encoder, and Symbol Mapper are shown in FigureÊ5), two channels (one for I and one for Q), a Combiner, and a 10-bit DAC. Each channel consists of a Nyquist Filter, Interpolation Filter, and Modulator. The Control Unit is comprised of a Bus Interface Unit (BIU), Clock Generator, and NCO.
STEL1109 Data Sheet
