HSP50110JI-52 Intersil Corporation, HSP50110JI-52 Datasheet

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HSP50110JI-52

Manufacturer Part Number
HSP50110JI-52
Description
Manufacturer
Intersil Corporation
Datasheet

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Digital Quadrature Tuner
The Digital Quadrature Tuner (DQT) provides many of the
functions required for digital demodulation. These functions
include carrier LO generation and mixing, baseband
sampling, programmable bandwidth filtering, baseband AGC,
and IF AGC error detection. Serial control inputs are provided
which can be used to interface with external symbol and
carrier tracking loops. These elements make the DQT ideal
for demodulator applications with multiple operational modes
or data rates. The DQT may be used with HSP50210 Digital
Costas Loop to function as a demodulator for BPSK, QPSK,
8-PSK OQPSK, FSK, FM, and AM signals.
The DQT processes a real or complex input digitized at rates
up to 52 MSPS. The channel of interest is shifted to DC by a
complex multiplication with the internal LO. The quadrature
LO is generated by a numerically controlled oscillator (NCO)
with a tuning resolution of 0.012Hz at a 52MHz sample rate.
The output of the complex multiplier is gain corrected and fed
into identical low pass FIR filters. Each filter is comprised of a
decimating low pass filter followed by an optional
compensation filter. The decimating low pass filter is a 3
stage Cascaded-Integrator-Comb (CIC) filter. The CIC filter
can be configured as an integrate and dump filter or a third
order CIC filter with a (sin(X)/X)
filters are provided to flatten the (sin(X)/X)
CIC. If none of the filtering options are desired, they may be
bypassed. The filter bandwidth is set by the decimation rate of
the CIC filter. The decimation rate may be fixed or adjusted
dynamically by a symbol tracking loop to synchronize the
output samples to symbol boundaries. The decimation rate
may range from 1-4096. An internal AGC loop is provided to
maintain the output magnitude at a desired level. Also, an
input level detector can be used to supply error signal for an
external IF AGC loop closed around the A/D.
The DQT output is provided in either serial or parallel formats
to support interfacing with a variety DSP processors or digital
filter components. This device is configurable over a general
purpose 8-bit parallel bidirectional microprocessor control bus.
Block Diagram
CONTROL/STATUS
REAL OR COMPLEX
CONTROL
INPUT DATA
IF AGC
BUS
10
10
DETECT
LEVEL
TM
1
3
response. Compensation
MULTIPLIER
COMPLEX
Data Sheet
8
N
response of the
GCA
GCA
PROGRAMMABLE
INTERFACE
CONTROL
90
0
o
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
o
LOW PASS FIR
LOW PASS FIR
FILTER
FILTER
1-888-INTERSIL or 321-724-7143
NCO
FILTER
LOOP
Features
• Input Sample Rates to 52MSPS
• Internal AGC Loop for Output Level Stability
• Parallel or Serial Output Data Formats
• 10-Bit Real or Complex Inputs
• Bidirectional 8-Bit Microprocessor Interface
• Frequency Selectivity <0.013Hz
• Low Pass Filter Configurable as Three Stage Cascaded-
• Fixed Decimation from 1-4096, or Adjusted by NCO
• Input Level Detection for External IF AGC Loop
• Designed to Operate with HSP50210 Digital Costas Loop
• 84 Lead PLCC
Applications
• Satellite Receivers and Modems
• Complex Upconversion/Modulation
• Tuner for Digital Demodulators
• Digital PLLs
• Related Products: HSP50210 Digital Costas Loop;
• HSP50110/210EVAL Digital Demod Evaluation Board
Ordering Information
HSP50110JC-52
HSP50110JI-52
Integrator-Comb (CIC), Integrate and Dump, or Bypass
Synchronization with Baseband Waveforms
A/D Products HI5703, HI5746, HI5766
PART NUMBER
March 2001
RE-SAMPLING
NCO
Copyright © Intersil Americas Inc. 2001, All Rights Reserved
|
Intersil and Design is a trademark of Intersil Americas Inc.
DUMP
RANGE (
DETECT
LEVEL
-40 to 85
TEMP.
0 to 70
o
C)
File Number
10
10
84 Ld PLCC
84 Ld PLCC
PACKAGE
CARRIER
TRACKING CONTROL
SAMPLE STROBE
Q DATA
HSP50110
SAMPLE RATE
CONTROL
I DATA
N84.1.15
N84.1.15
PKG. NO.
3651.6

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HSP50110JI-52 Summary of contents

Page 1

... Tuner for Digital Demodulators N response of the • Digital PLLs • Related Products: HSP50210 Digital Costas Loop; A/D Products HI5703, HI5746, HI5766 • HSP50110/210EVAL Digital Demod Evaluation Board Ordering Information PART NUMBER HSP50110JC-52 HSP50110JI-52 LOOP FILTER GCA LOW PASS FIR FILTER ...

Page 2

Pinout IIN5 IIN4 IIN3 IIN2 GND IIN1 IIN0 ENI QIN9 QIN8 QIN7 QIN6 QIN5 QIN4 V CC QIN3 QIN2 QIN1 QIN0 PH1 PH0 Pin Descriptions NAME TYPE V - +5V Power Supply. CC GND - Ground. IIN9-0 I In-Phase Input. ...

Page 3

Pin Descriptions (Continued) NAME TYPE SOF I Sampler Offset Frequency. This serial input is used to load the Sampler Offset Frequency into the Re-Sampler NCO (see Serial Interface Section). The new offset frequency is shifted in MSB first by CLK ...

Page 4

HI/LO OUTPUT SENSE † LEVEL THRESHOLD FOR HI/LO DETECT EXTERNAL AGC † SYNTHESIZER/MIXER 10 IIN0-9 COMPLEX CLK MULTIPLIER 10 QIN0-9 ENI COS INPUT MODE † INPUT FORMAT † PH0-1 SYNTHESIZER CFLD COF SHIFT REG COFSYNC COF EN † WORD WIDTH ...

Page 5

Note: the effective input sample rate to the internal processing elements is equal to the frequency with which ENI is asserted “low”. In Interpolated Input Mode, ...

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Carrier Frequency (CF) Register and the Carrier Offset Frequency (COF) Register. As the accumulator sum transitions from ROM produces quadrature outputs whose phase advances o o from 0 to 360 . The sum ...

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Figure 3. The AGC gain is given by: E Gain = (1 AGC MAPS TO AGC UPPER AND LOWER LIMITS ...

Page 8

The Integrate and Dump filter exhibits a frequency response given --- - sin fR /sin where f is normalized frequency relative to the input sample rate and R is the decimation ...

Page 9

This is evident by the narrow alias free part of the output bandwidth as shown in Figures 8 and 9. The more rapid roll off of the third order CIC produces an ...

Page 10

FIGURE 12. To create the alias profile, a composite response, the components of which are shown in the ”D” portion of Figure 12, is made from the sum of all ...

Page 11

TO DECIMATING FILTERS PROGRAMMABLE DIVIDER SAMPLE PHASE † OUT CONTROL DATARDY MUX SYNC CLK 32-BIT ADDER 5 CARRY OUTPUT SHIFTER 8 RE-SAMPLER 32 NCO REG + † MUX SOF ENABLE SOF REG SCF REG SOFSYNC SYNC SAMPLER ...

Page 12

CLK by a programmable factor When the programmable clock factor is 1, IOUT9 is pulled high, and the CLK signal should be used as the clock. The beginning of a serial data word is signaled ...

Page 13

The Compensation Filter output is then rounded and limited to a 10-bit output range 0 -9 corresponding to bit positions Setting DQT Gains ...

Page 14

Thus, the minimum input signal will be -21.66dB below full scale (-9.66 -12 for A/D Backoff). As before the maximum input signal in the absence of noise is -12dB down due to A/D backoff. From Equation 14, the gain relationships ...

Page 15

R R HI/ SIN/COS CIC SCALER LEVEL VECTOR FROM -36 2 DETECT CARRIER NCO IIN0- QIN0 COMPLEX MULTIPLIER MANTISSA (1.0 ...

Page 16

Serial Input Interfaces Frequency control data for the NCOs contained in the Synthesizer/Mixer and the Re-Sampler are loaded through two separate serial interfaces. The Carrier Offset Frequency Register controlling the Synthesizer NCO is loaded via the COF and COFSYNC pins. ...

Page 17

For added flexibility, the CFLD input provides an alternative mechanism for transferring data from the Microprocessor Interfaces’s Holding Registers to the Center Frequency Register. When CFLD is sampled “high” by the rising edge of clock, the contents of the Holding ...

Page 18

BIT POSITIONS FUNCTION 31-0 Center Frequency This register controls the center frequency of the Synthesizer/Mixer NCO. This 32-bit two’s complement value sets the center frequency as described in the Synthesizer/Mixer Section. Center Format: [XXXXXXXX]H BIT POSITION FUNCTION 31-0 Sampler Center ...

Page 19

BIT POSITION FUNCTION 0 Input Format 0 = Two’s complement input format Offset binary input format. Note real input with offset binary weighting is used, the unused quadrature input pins should be tied to 1000000000. 1 ...

Page 20

TABLE 10. DECIMATING FILTER CONFIGURATION REGISTER (Continued) BIT POSITION FUNCTION 31-23 Reserved. BIT POSITION FUNCTION 0 HI/LO Output Sense 1 = HI/LO output of 1 means input > threshold HI/LO output of 1 means input (See Input Level ...

Page 21

BIT POSITION FUNCTION 7-0 Phase Offset This 8 bit two’s complement value specifies a carrier phase offset of (n/128) where n is the two’s com- plement value. This provides a range of phase offsets from - to *(127/128). (See Synthesizer/Mixer ...

Page 22

Absolute Maximum Ratings Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 23

AC Electrical Specifications Note 8, V PARAMETER CLK to IOUT9-0, QOUT9-0, DATARDY, LOTP, SSTRB, SPH4-0, HI/LO WR High WR Low RD Low RD LOW to Data Valid RD HIGH to Output Disable Output Enable WR to CLK Output Disable Time ...

Page 24

Waveforms t WRL C0-7, A0-2 FIGURE 26. TIMING RELATIVE 2.0V 0.8V FIGURE 28. OUTPUT RISE AND FALL TIMES 24 HSP50110 IIN9-0, QIN9-0, ENI, PH1-0, CFLD, COF, SOF, COFSYNC, t WRH t WH OEI ...

Page 25

... Intersil Corporation’s quality certifications can be viewed at website www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. How- ever, no responsibility is assumed by Intersil or its subsidiaries for its use ...

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