Cirrus Logic CS5534-AS - Manual (Page 37)

CS5531/32/33/34-AS
DS289F5 37
2.8.1. Conversion Data Output Descriptions
CS5531/33 (16-BIT CONVERSIONS)
CS5532/34 (24-BIT CONVERSIONS)
Conversion Data Bits [31:16 for CS5531/33; 31:8 for CS5532/34]
These bits depict the latest output conversion.
NU (Not Used) [15:3 for CS5531/33; 7:3 for CS5532/34]
These bits are masked logic zero.
OF (Over-range Flag Bit) [2]
0 Bit is clear when over-range condition has not occurred.
1 Bit is set when input signal is more positive than the positive full scale, more negative than zero (unipolar
mode) or when the input is more negative than the negative full scale (bipolar mode).
CI (Channel Indicator Bits) [1:0]
These bits indicate which physical input channel was converted.
00 Physical Channel 1
01 Physical Channel 2
10 Physical Channel 3
11 Physical Channel 4
Table 4. Output Coding for 16-bit CS5531 and CS5533
Unipolar Input
Voltage
Offset
Binary
Bipolar Input
Voltage
Two's
Complement
>(VFS-1.5 LSB) FFFF >(VFS-1.5 LSB) 7FFF
VFS-1.5 LSB FFFF
------
FFFE
VFS-1.5 LSB
7FFF
------
7FFE
VFS/2-0.5 LSB 8000
------
7FFF
-0.5 LSB
0000
------
FFFF
+0.5 LSB 0001
------
0000
-VFS+0.5 LSB
8001
------
8000
<(+0.5 LSB) 0000 <(-VFS+0.5 LSB) 8000
Table 5. Output Coding for 24-bit CS5532 and CS5534
Unipolar Input
Voltage
Offset
Binary
Bipolar Input
Voltage
Two's
Complement
>(VFS-1.5 LSB) FFFFFF >(VFS-1.5 LSB) 7FFFFF
VFS-1.5 LSB FFFFFF
------
FFFFFE
VFS-1.5 LSB
7FFFFF
------
7FFFFE
VFS/2-0.5 LSB 800000
------
7FFFFF
-0.5 LSB
000000
------
FFFFFF
+0.5 LSB 000001
------
000000
-VFS+0.5 LSB
800001
------
800000
<(+0.5 LSB) 000000 <(-VFS+0.5 LSB) 800000
D31(MSB) D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
MSB 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 0 0 0 0 0 0 0 0 0 OF CI1 CI0
D31(MSB) D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
MSB 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
7 6 5 4 3 2 1 LSB 0 0 0 0 0 OF CI1 CI0