HSP50215 데이터 시트보기 (PDF) - Intersil
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HSP50215 Datasheet PDF : 21 Pages
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HSP50215
Configuration Control Register Bit Definitions
CONTROL ADDRESS 0: I CHANNEL INPUT
BIT
POSITION
FUNCTION
DESCRIPTION
15-0
I Channel QASK Input or IIN(15:0). In QASK mode, this is the I input vector. The format is 2’s complement. The MSB is bit 15.
FM Input
The mixer operation is:
OUT = (I*COS) - (Q*SIN).
In FM mode, this is interpreted as an offset frequency to the center frequency. The modulation index
depends on the mode and the filter coefficients. In FM with post filter mode, the phase change per
input sample can range from -180 to 180 degrees, so the deviation is limited to ±(input sample rate)/2.
BIT
POSITION
15-0
FUNCTION
Q Channel Input
CONTROL ADDRESS 1: Q CHANNEL INPUT
DESCRIPTION
QIN(15:0). In QASK mode, this is the Q input vector. See address 0 above. In FM mode, this input is
not used.
BIT
POSITION
15-14
13-0
CONTROL ADDRESS 2: TIMING NCO FREQUENCY MSBYTE CONTROL WORD
FUNCTION
Reserved (Note 1)
Sample Rate Ratio’s
Most Significant 14 Bits
DESCRIPTION
Reserved (Note 1).
SR(29:16). The sample rate is controlled by a 30-bit NCO clocked at the output clock rate. The upper
MSByte of the sample rate ratio SR(29:0), or SR(29:16), is loaded in this address. The sample rate is
computed by the formula:
FRESAMP = SR(29:0) x fCLK x 2-32; SR (29:0) = INT[(FRESAMP/fCLK) X 232].
BIT
POSITION
15-0
CONTROL ADDRESS 3: TIMING NCO FREQUENCY LSBYTE CONTROL WORD
FUNCTION
DESCRIPTION
Sample Rate Ratio’s
SR(15:0). See Control Address 2. SR(15:0) is loaded in this address.
Least Significant 16 Bits
BIT
POSITION
15-0
CONTROL ADDRESS 4: CARRIER CENTER FREQUENCY MSBYTE CONTROL WORD
FUNCTION
Carrier Center
Frequency’s Most
Significant 16 Bits
DESCRIPTION
CF(31:16). The SIN/COS ROM is controlled by a 32-bit NCO clocked at the input clock rate. The upper
MSByte of the sample rate ratio CF(31:0), or CF(31:16), is loaded in this address. The center frequen-
cy is computed by the formula:
fC = CF(31:0) x fCLK x 2-32; CF(31:0) = INT(fC/fCLK X 232). Setting CW 4 and 5 to zero bypasses the
mixers (COS = 1; SIN = 0).
BIT
POSITION
15-0
CONTROL ADDRESS 5: CARRIER CENTER FREQUENCY LSBYTE CONTROL WORD
FUNCTION
Carrier Center
Frequency’s Least
Significant 16 Bits
DESCRIPTION
CF(15:0). See Control Address 4. CF(15:0) is loaded in this address. Setting CW 4 and 5 to zero by-
passes the mixers (COS = 1; SIN = 0).
BIT
POSITION
15-4
3
FUNCTION
Reserved (Note 1)
Enable Output
CONTROL ADDRESS 16: MODULATION CONTROL
Reserved (Note 1).
EN OUT.
DESCRIPTION
3-437
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