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参数资料
| 型号： | HSP50214BVCZ |
| 厂商： | Intersil |
| 文件页数： | 13/62页 |
| 文件大小： | 0K |
| 描述： | IC DOWNCONVERTER 14BIT 120-MQFP |
| 标准包装： | 24 |
| 功能： | 降频器 |
| RF 型： | AMPS，CDMA，GSM，TDMA |
| 封装/外壳： | 120-BQFP |
| 包装： | 托盘 |
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HSP50214B
Typically, the average input error is read from the Input Level
Detector port for use in AGC Applications. By setting the
modulo 2 32 . The output frequency of the NCO is computed
as:
threshold to 0, however, the average value of the input signal
can be read directly. The calculation is:
f C = f S * N ? ( 2
32
) ,
(EQ. 3)
dBFS RMS = ( 20 ) log [ ( 1.111 ) ( level ) ? ( ( N ) ( 16 ) ) ]
(EQ. 2)
or in terms of the programmed value:
where “level” is the 24-bit value read from the 3 level
N = INT [ f C × 2
32
? f S ] HEX ,
(EQ. 3A)
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
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 .
TO MIXERS
.
COS
SIN
A) INPUT SIGNAL
B) RECTIFIED SIGNAL
18
18
REG
REG
CARRIER
PHASE
STROBE ?
SIN/COS
ROM
C) THRESHOLD
D) ACCUMULATOR INPUTS
18
+
10 R
E
G
R
E
G
CARRIER
PHASE
OFFSET ?
PHASE
ACCUMULATOR
0
CLEAR
PHASE
ACC U M ?
ENI
REG
MUX
R
E
G
E) DETECTOR OUTPUT
F) CLOSED LOOP STEADY STATE
(CONSTANT INPUT)
COF
MUX
+
ENABLE ?
32
COF
0
REG
32
CF
CARRIER
FREQUENCY
STROBE ?
FIGURE 11. SIGNAL PROCESSING WITHIN LEVEL DETECTOR
In the HSP50214B, the polarity of the LSB’s of the
integration period pre-load is selectable. If Control Word 27,
COFSYNC
COF
SYNCIN1
SYNC
SHIFT REG
SYNC
CIRCUITRY
REG
REG
CARRIER
FREQUENCY ?
(f C )
CARRIER
LOAD ON
UPDATE ?
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
13
? Controlled via microprocessor interface.
FIGURE 12. BLOCK DIAGRAM OF NCO SECTION
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 65MSPS and ENI is
tied low.
FN4450.4
May 1, 2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HSP50214BVI | 功能描述:上下转换器 120L MQFP INDTEMP 14-BIT PROGRAMMABLE DOWNCONVERTER 65MSPS RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-128 |
| HSP50214BVIZ | 功能描述:上下转换器 120L MQFP INDTEMP 14-BIT PROG DWNCNVRT RoHS:否 制造商:Texas Instruments 产品:Down Converters 射频:52 MHz to 78 MHz 中频:300 MHz LO频率: 功率增益: P1dB: 工作电源电压:1.8 V, 3.3 V 工作电源电流:120 mA 最大功率耗散:1 W 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体: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 |
| HSP50215 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:DSP Modulator Evaluation Board |
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