TMC2330AH5C CADEKA [Cadeka Microcircuits LLC.], TMC2330AH5C Datasheet - Page 10

• Manufacturer Part Number: TMC2330AH5C
• Description: Coordinate Transformer 16 x 16 Bit, 40 MOPS
• Manufacturer: CADEKA [Cadeka Microcircuits LLC.]

PRODUCT SPECIFICATION
Timing Diagrams
No Accumulation
Note: OERX = OEPY = LOW
Phase Modulation
Notes:
1. OERX = OEPY = LOW
2. Carrier C and amplitude R loaded on CLK0.
3. Modulation Values I, J, K, L… Loaded on CLK1, CLK2, etc.
4. Output corresponding to modulation loaded at CLKi emerged tDO after CLKi + 21.
5. To modulate amplitude, vary XRIN with ENXR = 1.
Applications Discussion
Numeric Overflow
Because the TMC2330A accommodates 16-bit unsigned
radii and 16-bit signed Cartesian coordinates, Polar-To-
Rectangular conversions can overflow for incoming radii
greater than 32767= 7FFFh and will overflow for all incom-
ing radii greater than 46341=B505h. (ln signed magnitude
mode, a radius of 46340 = B504h will also overflow at all
angles.) The regions of overflow and of correct conversion
are illustrated in Figure 1.
10
RXOUT[15:0],
RXOUT[15:0]
PYOUT[15:0]
PYOUT[15:0]
XRIN[15:0],
RTP, TCXY
RTP, TCXY
XRIN[15:0]
YPIN[31:0]
YPIN[31:0]
ENYP[1:0]
ENYP[1:0]
ACC[1:0]
ACC[1:0]
ENXR,
ENXR
CLK
CLK
00
10
R
C
0
0
01
01
I
tS
1
EN
00
A
1
tH
01
01
J
2
EN
00
B
tPWH
01
2
01
K
3
tPWL
In signed magnitude mode, overflows are circularly symmet-
rical—if a given radius overflows at an angle P, it will also
overflow at the angles -P, +P, and -P. This is because -X
will overflow if and only if X overflows, and -Y will over-
flow if and only if Y overflows.
In two’s complement mode, the number system’s asymmetry
complicates the overflow conditions slightly. An input vector
with an X component of -32768=8000h will not overflow,
whereas one with an X component of +32768 will. Table 3
summarizes several simple cases of overflow and near-over-
flow.
EN
00
C
01
01
L
3
…
…
…
…
…
…
22
…
…
…
…
…
…
C + I
23
22
2C + J
tD
f(A)
24
REV. 1.1.8 10/31/00
3C + K
tHO
23
25
TMC2330A
f(B)
4C + L