ISL5216_14 Datasheet, PDF (9/65 Pages) Intersil Corporation – Four-Channel Programmable Digital Downconverter

ISL5216
13-BIT MODE: 13-BIT MANTISSA (15:3), 3-BIT EXPONENT (2:0), 18dB EXPONENT RANGE (Note 7)
EXPONENT
GAIN (dB)
PIN BIT WEIGHTING TO 16-BIT INPUT MAPPING
X(2:0) = 000
0
X15 X15 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3
X(2:0) = 001
6
X15 X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0
X(2:0) = 010
12
X15 X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0
X(2:0) = 011
18
(Note 6)
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
NOTES:
6. Or 100, 101, 110, or 111, the exponent input saturates at 011.
7. To select this mode, set IWA *000H/GWA F804H bits 17, 16, 8 and 7 to 0, 0, 1 and 0 respectively.
14-BIT MODE: 14-BIT MANTISSA (15:2), 2-BIT EXPONENT (1:0), 18dB MAXIMUM EXPONENT RANGE (Note 8)
EXPONENT
GAIN (dB)
PIN BIT WEIGHTING TO 16-BIT INPUT MAPPING
X(1:0) = 00
0
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
X(1:0) = 01
6
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
X(1:0) = 10
12
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
X(1:0) = 11
18
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
NOTE:
8. To select this mode, set IWA *000H/GWA F804H bits 17, 16, 8 and 7 to 0, 0, 1 and 1 respectively.
14-BIT MODE: 14-BIT MANTISSA (15:2), 3-BIT EXPONENT (-1,1,0), 42dB MAXIMUM EXPONENT RANGE (Note 9)
EXPONENT
GAIN (dB)
PIN BIT WEIGHTING TO 16-BIT INPUT MAPPING
X(-1,1,0) = 000 0
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
X(-1,1,0) = 001 6
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
X(-1,1,0) = 010 12
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
X(-1,1,0) = 011 18
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
X(-1,1,0) = 100 24
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
X(-1,1,0) = 101 30
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
X(-1,1,0) = 110 36
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
X(-1,1,0) = 111 42
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 X2 0 0
NOTE:
9. To select this mode, set IWA *000H/GWA F804H bits 17, 16, 8 and 7 to 1, 0, 1 and 1 respectively.
11, 12, 13-BIT MODE: 11, 12, 13-BIT MANTISSA, 3-BIT EXPONENT (-1,1,0) (Note 10), 42dB MAXIMUM EXPONENT RANGE (Note 11)
EXPONENT
GAIN (dB)
PIN BIT WEIGHTING TO 16-BIT INPUT MAPPING
X(-1,1,0) = 000 0
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
X(-1,1,0) = 001 6
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
X(-1,1,0) = 010 12
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
X(-1,1,0) = 011 18
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
X(-1,1,0) = 100 24
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
X(-1,1,0) = 101 30
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
X(-1,1,0) = 110 36
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
X(-1,1,0) = 111 42
X15 X14 X13 X12 X11 X10 X9 X8 X7 X6 X5 X4 X3 0 0 0
NOTES:
10. For compatibility with legacy HSP50216 11, 12 and 13 bit floating point modes as well as the new ISL5216 modes, the most significant exponent
bit is taken as X2 OR’d with X-1. Either input may be used for the MSB of the exponent when the other is tied low.
11. To select these modes, set IWA *000H/GWA F804H bits 17 and 16 to 1 and 0, respectively, and bits 8 and 7 to 0 and 0 for 11/3, 0 and 1 for 12/3,
and 1 and 0 for 13/3.
9
FN6013.3
July 13, 2007