參數(shù)資料
型號(hào)： HSP50214BVC
廠商： HARRIS SEMICONDUCTOR
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Programmable Downconverter
中文描述： SPECIALTY TELECOM CIRCUIT, PQFP120
文件頁(yè)數(shù)： 14/60頁(yè)
文件大?。?/td> 573K
代理商： HSP50214BVC
3-14
Typically, the average input error is read from the Input Level
Detector port for use in AGC Applications. By setting the
threshold to 0, however, the average value of the input signal
can be read directly. The calculation is:
where “l(fā)evel” is the 24-bit value read from the 3 level
Detector Registers and “N” is the number of samples to be
integrated. Note that to get the RMS value of a sinusoid,
multiply the average value of the rectified sinusoid by 1.111.
For a full scale input sinusoid, this yields an RMS value of
approximately 3dBf
S
.
NOTE: 1.111 scales the rectified sinusoid average (2/
π
) to 1/
√
2
.
In the HSP50214B, the polarity of the LSB’s of the
integration period pre-load is selectable. If Control Word 27,
Bit 23 is set to a logic one, the two LSB’s of the integration
period preload are set to logic ones. This allows a power of
two to be set for the integration period, for easy
normalization in the processor. If Control Word 27, Bit 23 is
set to a logic zero, then the two LSB’s of the integration
period preload are set to zeros as in the HSP50214.
Carrier Synthesizer/Mixer
The Carrier Synthesizer/Mixer Section of the HSP50214B is
shown in Figure 12. The NCO has a 32-bit phase
accumulator, a 10-bit phase offset adder, and a sine/cosine
ROM. The frequency of the NCO is the sum of a center
frequency Control Word, loaded via the microprocessor
interface (Control Word 3, Bits 0 to 31), and an offset
frequency, loaded serially via the COF and COFSYNC pins.
The offset frequency can be zeroed in Control Word 0, Bit 1.
Both frequency control terms are 32 bits and the addition is
modulo 2
32
. The output frequency of the NCO is computed
as:
or in terms of the programmed value:
where N is the 32-bit sum of the center and offset frequency
terms, f
C
is the frequency of the carrier NCO sinusoids, f
S
is
the input sampling frequency, and INT is the integer of the
computation. See the Microprocessor Write Section on
instructions for writing Control Word 3
.
For example, if N is 3267 (decimal), and f
S
is 65MHz, then f
C
is 49.44Hz. If received data is modulated at a carrier
frequency of 10MHz, then the synthesizer/mixer should be
programmed for N = 27627627 (hex) or D89D89D8 (hex).
Because the input enable, ENI, controls the operation of the
phase accumulator, the NCO output frequency is computed
relative to the input sample rate, f
S
, not to f
CLKIN
. The
frequency control, N, is interpreted as two’s complement
because the output of the NCO is quadrature. Negative
frequency L.O.s select the upper sideband; positive frequency
L.O.s select the lower sideband. The range of the NCO is
-f
S
/2 to +f
S
/2. The frequency resolution of the NCO is f
S
/(2
32
)
or approximately 0.015Hz when CLKIN is 65 MSPS and ENI
is tied low.
dBFS
RMS
20
(
)
1.111
(
)
level
(
)
N
( )
16
(
)
(
)
[
]
log
=
(EQ. 2)
A
A) INPUT SIGNAL
C) THRESHOLD
B) RECTIFIED SIGNAL
D) ACCUMULATOR INPUTS
E) DETECTOR OUTPUT
A
A
A
A
A
F) CLOSED LOOP STEADY STATE
(CONSTANT INPUT)
FIGURE 11. SIGNAL PROCESSING WITHIN LEVEL DETECTOR
f
C
f
S
* N
2
32
(
)
,
=
(EQ. 3)
N
INT f
C
2
32
f
S
×
[
]
HEX
,
=
(EQ. 3A)
SHIFT REG
SYNC
REG
REG
COF
COFSYNC
SIN/COS
ROM
REG
REG
TO MIXERS
COS
18
SIN
CARRIER
FREQUENCY
(f
C
)
CARRIER
FREQUENCY
STROBE
CARRIER
PHASE
OFFSET
32
32
10
18
MUX
0
COF
MUX
0
CLEAR
PHASE
ACCUM
PHASE
ACCUMULATOR
CF
COF
ENABLE
R
E
G
REG
+
REG
+
Controlled via microprocessor interface.
18
CARRIER
PHASE
CARRIER
LOAD ON
UPDATE
R
E
G
STROBE
SYNC
CIRCUITRY
ENI
FIGURE 12. BLOCK DIAGRAM OF NCO SECTION
R
E
G
SYNCIN1
HSP50214B
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HSP50214BVCZ 功能描述:上下轉(zhuǎn)換器 120L MQFP COMTEMP 14-BIT PROG DWNCNVRT RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128
HSP50214BVI 功能描述:上下轉(zhuǎn)換器 120L MQFP INDTEMP 14-BIT PROGRAMMABLE DOWNCONVERTER 65MSPS RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128
HSP50214BVIZ 功能描述:上下轉(zhuǎn)換器 120L MQFP INDTEMP 14-BIT PROG DWNCNVRT RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128
HSP50214VC 制造商:Rochester Electronics LLC 功能描述:- Bulk
HSP50214VI 制造商:Rochester Electronics LLC 功能描述:- Bulk
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