hsp50215 Intersil Corporation, hsp50215 Datasheet - Page 16

• Manufacturer Part Number: hsp50215
• Description: Digital Upconverter
• Manufacturer: Intersil Corporation

Configuration Control Register Bit Definitions
POSITION
POSITION
POSITION
POSITION
POSITION
POSITION
POSITION
15-14
15-0
15-0
13-0
15-0
15-0
15-0
15-4
BIT
BIT
BIT
BIT
BIT
BIT
BIT
3
I Channel QASK Input or
FM Input
Q Channel Input
Reserved (Note 1)
Sample Rate Ratio’s
Most Significant 14 Bits
Sample Rate Ratio’s
Least Significant 16 Bits
Carrier Center
Frequency’s Most
Significant 16 Bits
Carrier Center
Frequency’s Least
Significant 16 Bits
Reserved (Note 1)
Enable Output
FUNCTION
FUNCTION
FUNCTION
FUNCTION
FUNCTION
FUNCTION
FUNCTION
CONTROL ADDRESS 4: CARRIER CENTER FREQUENCY MSBYTE CONTROL WORD
CONTROL ADDRESS 5: CARRIER CENTER FREQUENCY LSBYTE CONTROL WORD
3-437
CONTROL ADDRESS 2: TIMING NCO FREQUENCY MSBYTE CONTROL WORD
CONTROL ADDRESS 3: TIMING NCO FREQUENCY LSBYTE CONTROL WORD
IIN(15:0). In QASK mode, this is the I input vector. The format is 2’s complement. The MSB is bit 15.
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.
QIN(15:0). In QASK mode, this is the Q input vector. See address 0 above. In FM mode, this input is
not used.
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:
F
SR(15:0). See Control Address 2. SR(15:0) is loaded in this address.
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:
f
mixers (COS = 1; SIN = 0).
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).
Reserved (Note 1).
EN OUT.
C
CONTROL ADDRESS 16: MODULATION CONTROL
RESAMP
= CF(31:0) x f
CONTROL ADDRESS 1: Q CHANNEL INPUT
CONTROL ADDRESS 0: I CHANNEL INPUT
= SR(29:0) x f
CLK
HSP50215
x 2
-32
CLK
; CF(31:0) = INT(f
x 2
-32
; SR (29:0) = INT[(F
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
C
/f
CLK
X 2
RESAMP
32
). Setting CW 4 and 5 to zero bypasses the
/f
CLK
) X 2
32
].