HSP50210JI-52Z Intersil, HSP50210JI-52Z Datasheet - Page 14

• Manufacturer Part Number: HSP50210JI-52Z
• Description: IC DEMODULATOR COSTAS 84-PLCC
• Manufacturer: Intersil

Specifications of HSP50210JI-52Z

• Function: Demodulator
• Frequency: 52MHz
• Rf Type: AM, FM
• Package / Case: 84-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Loop Gain, accumulated in the loop filter, limited and output to
the gain adjusters. The AGC loop tries to make the error
correction as quickly as possible, but is limited by the AGC
Loop Gain and potentially, the AGC limits. The maximum
AGC response is the maximum gain adjustment made in any
given clock cycle. This involves applying maximum Loop gain
AGC Response
where (0.5) is the MSB of the 0.81 scaling in the Cartesian-to-Polar Coordinate Converter, (0.5) is the MSB of the mantissa of the
Loop Gain, (2
A similar procedure is used to calculate the minimum AGC response rate.
Thus, the expected range for the AGC rate is approximately 0.0004 to 0.0469dB/symbol time.
AGC Response
AGC Response
POSITION
ACCUM
AGC
BIT
22
21
20
19
18
17
16
15
14
13
12
10
11
9
8
7
6
5
4
3
2
1
0
ERROR
-7
INPUT
MAX
GAIN
8(S)
) is the maximum shift gain, and 24 is the maximum loop filter gain.
MAX
MIN
7
6
5
4
3
2
1
0
= Input (Cartesian to Polar Converter Gain)(Error Detector Gain)(AGC Loop Gain)(AGC Output Weighting)
=
=
±
WEIGHT
±
ERROR
1 0.5
1 0.5
= 1(S)
GAIN
(
= 0•
(
BIT
= 1
= 2
= 3
= 4
= 5
= 6
= 7
)
14
)
(
(
0.5
0.5
) 2
) 2
FILTER GAIN
(
(MANTISSA)
(
AGC LOOP
–
–
14
7
) 24
) 24
0.
(
x
x
x
x
(
)
)
=
=
±
±
1 2
1 2
MULTIPLIER
(
AGC LOOP
(
TABLE 6. AGC BIT WEIGHTING
(OUTPUT)
–
FILTER
–
9
GAIN
12(S)
16
) 24
11
10
(
9
8
7
6
5
4
3
2
1
0
) 24
(
)
HSP50210
)
=
=
0.04688dB symbol time
0.000366dB symbol time
GAIN BITS
FILTER
LOOP
KEPT
12(S)
AGC
(rnd)
10
11
9
8
7
6
5
and setting the AGC limits as wide as possible. A calculation
using only exponent terms of the various gains will be
sufficient to yield a rough order of magnitude of the range of
the AGC Loop response. The results are shaded in the last
column of Table 6 on page 14 and provided in detail in
Equations 10 and 11.
⁄
⁄
= 0•
= 1
= 1
= 2
= 3
= 4
= 5
= 6
SHIFT = 0
Multiplier →
Multiplier →
0•
1
1
2
3
4
5
6
SHIFT = 7
Shifter → E
Shifter → E
0•
1
1
2
3
4
5
6
M
M
M
M
M
M
G
G
G
G
G
G
G
G
G
G
LIMITS BIT
•
G
AND AGC
OUTPUT
WEIGHT
AGC
0-7
-10
-11
-12
-13
-14
-15
-16
-17
-18
-19
-20
-21
-1
-2
-3
-4
-5
-6
-8
-9
1
0
RESOLUTION
0.00000572
0.00000286
AGC GAIN
0.0000916
0.0000458
0.0000229
0.0000114
0.000732
0.000366
0.000183
0.09375
0.04688
0.02344
0.00586
0.00293
0.00146
0.01172
0.1875
0.375
(dB)
0.75
1.5
12
July 2, 2008
6
3
(EQ. 10)
(EQ. 11)
FN3652.5