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參數(shù)資料
| 型號： | HSP50214BVC |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 通信及網(wǎng)絡 |
| 英文描述： | Programmable Downconverter |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP120 |
| 文件頁數(shù)： | 22/60頁 |
| 文件大?。?/td> | 573K |
| 代理商： | HSP50214BVC |
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3-22
the AGC THRESHOLD value (Control Word 8, Bits 16-28) is
shown in Table 5. Note that the MSB is always zero. The range
oftheAGCTHRESHOLDvalueis0to+3.9995.TheAGCError
Detector output has the identical range.
The loop gain is set in the AGC Error Scaling circuitry, using
the two programmable mantissas and exponents. The
mantissa, M, is a 4-bit value which weights the loop filter
input from 0.0 to 0.9375. The exponent, E, defines a shift
factor that provides additional weighting from 2
0
to 2
-15
.
Together the mantissa and exponent define the loop gain as
given by,
where M
LG
is a 4-bit binary value ranging from 0 to 15, and
E
LG
is a 4-bit binary value ranging from 0 to 15. Table 7 and
8 detail the binary values and th
e
resulting scaling effects of
the AGC scaling mantissa and exponent. The composite
(shifter and multiplier) AGC scaling Gain range is from
0.0000 to 2.329(0.9375)
2
0
= 0.0000 to 2.18344. The scaled
gain error can range (depending on threshold) from 0 to
2.18344, which maps to a “gain change per sample” range
of 0 to 3.275dB/sample.
The AGC Gain mantissa and exponent values are
programmed into Control Word 8, Bits 0-15. The PDC
provides for the storing of two values of AGC Scaling Gain
(both exponent and mantissa). This allows for quick
adjustment of the loop gain by simply asserting the external
control line AGCGNSEL. When AGCGNSEL = 0, then AGC
GAIN 0 is selected, and when AGCGNSEL = 1, AGC Loop
Gain 1 is selected. Possible applications include
acquisition/tracking, no burst present/burst present, strong
signal/weak signal, track/hold, or fast/slow AGC values.
The AGC loop filter consists of an accumulator with a built in
limiting function. The maximum and minimum AGC gain
limits are provided to keep the gain within a specified range
and are programed by 12-bit Control Words using the
following the equation:
where m is an 8-bit mantissa value between 0 and 255, and e
is the 4-bit exponent ranging from 0 to 15. Control Word 9,
Bits 16-27 are used for programming the upper limit, while bits
0-11 are used to program the lower threshold. The ranges and
format for these limit values are shown in Tables 6A - C. The
bit weightings for the AGC Loop Feedback elements are
detailed in Table 9.
TABLE 5. AGC THRESHOLD (CONTROL WORD 8) BIT
WEIGHTING
28
27
26
25
24
23
22
21
20
19
18
17
16
2
2
2
1
2
0
.
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
(EQ. 16)
AGC Loop Gain
M
LG
2
4
–
2
15
ELG
–
(
)
–
=
(EQ. 17)
AGC Gain Limit
1
m
AGC
2
9
–
+
(
)
2
e
=
AGC Gain Limit
(
)
dB = 6.02
)
eeee
(
)
20
1.0
0.mmmmmmmm
(EQ. 17A)
+
(
)
log
+
TABLE 6A. AGC LIMIT EXPONENT vs GAIN
GAIN(dB)
EXPONENT
MANTISSA
96.332
15
255
90.309
15
0
84.288
14
0
78.268
13
0
72.247
12
0
66.227
11
0
60.206
10
0
54.185
9
0
48.165
8
0
42.144
7
0
36.124
6
0
30.103
5
0
24.082
4
0
18.062
3
0
12.041
2
0
6.021
1
0
0.000
0
0
TABLE 6B. AGC LIMIT MANTISSA vs GAIN
GAIN(dB)
EXPONENT
MANTISSA
6.000
0
255
5.750
0
240
5.500
0
226
5.250
0
212
5.000
0
199
4.750
0
185
4.500
0
173
4.250
0
161
4.000
0
149
3.750
0
138
3.500
0
127
3.250
0
116
3.000
0
105
2.750
0
95
2.500
0
85
2.250
0
75
2.000
0
66
1.750
0
57
1.500
0
48
1.250
0
39
1.000
0
31
0.750
0
23
0.500
0
15
0.250
0
7
0.020
0
1
HSP50214B
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HSP50214BVCZ | 功能描述:上下轉換器 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 安裝風格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| HSP50214BVI | 功能描述:上下轉換器 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 安裝風格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| HSP50214BVIZ | 功能描述:上下轉換器 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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