L2330 View Datasheet(PDF) - LOGIC Devices
Part Name
Description
MFG CO.
'L2330' PDF : 14 Pages View PDF
DEVICES INCORPORATED
L2330
Coordinate Transformer
Table 1. ‘M’ is the Modulation
Register and ‘C’ is the Carrier Register
as shown in the Functional Block
Diagram.
RTP — Rectangular-to-Polar
When RTP is HIGH, Rectangular-to-
Polar conversion mode is selected.
When RTP is LOW, Polar-to-Rectan-
gular conversion mode is selected.
ACC1-0 — Accumulator Control
ACC1-0 is the 2-bit accumulator
control that determines four modes as
shown in Table 2. Changing of the
internal phase Accumulator structure
is very useful when RTP is LOW
allowing for waveform synthesis and
modulation. ACC1-0 set to ‘00’ is most
commonly used when RTP is HIGH
unless performing backward mapping
from Cartesian to Polar coordinates.
TCXY — Data Input/Output Format
Select
When TCXY is HIGH, two’s comple-
ment format is selected. When TCXY
is LOW, sign-and-magnitude format is
selected.
FIGURE 1A. INPUT FORMATS
XRIN
Integer Unsigned Magnitude
15 14 13
215 214 213
210
22 21 20
YPIN
(RTP = 0)
Fract. Unsigned Mag./Two's Comp.
31 30 29
*±20 2–1 2–2
210
2–29 2–30 2–31
15 14 13
NS 214 213
Integer Signed Magnitude (RTP = 1, TCXY = 0)
210
22 21 20
31 30 29
NS 214 213
18 17 16
22 21 20
15 14 13
–215 214 213
Integer Two's Complement (RTP = 1, TCXY = 1)
210
22 21 20
31 30 29
–215 214 213
18 17 16
22 21 20
(RTP = 0)
Fractional Unsigned Magnitude
Fract. Unsigned Mag./Two's Comp.
15 14 13
20 2–1 2–2
210
2–13 2–14 2–15
31 30 29
*±20 2–1 2–2
210
2–29 2–30 2–31
15 14 13
NS 2–1 2–2
Fractional Signed Magnitude (RTP = 1, TCXY = 0)
210
2–13 2–14 2–15
31 30 29
NS 2–1 2–2
18 17 16
2–13 2–14 2–15
Fractional Two's Complement (RTP = 1, TCXY = 1)
15 14 13
–20 2–1 2–2
210
2–13 2–14 2–15
31 30 29
–20 2–1 2–2
18 17 16
2–13 2–14 2–15
*±20 denotes two's complement sign or highest magnitude bit. Since phase angles are modulo 2π
and phase accumulator is modulo 232, this bit may be regarded as ±π.
NS denotes negative sign. (i.e. '1' negates the number)
Special Arithmetic Functions
3
09/27/2001–LDS.2330-E
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