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- PAL20X4 PAL DESIGN SPECIFICATION
- ADC4 BIRKNER/COLI 07/29/81
- 4-BIT FLASH GRAY A/D CONVERTER
- MMI SUNNYVALE, CALIFORNIA
- CLK A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 GND
- /OC A1 A2 A3 /G3 /G2 /G1 /G0 A4 A5 NC VCC
- ;pinlist 1 to 24 must start in line 5
-
- ;equations go here
-
- G0 := /A3 * A1 ;CONVERT ANALOG TO G0 (LSB)
- + /A7 * A5
- :+: /A11* A9
- + /A15* A13
-
- G1 := /A6 * A2 ;CONVERT ANALOG TO G1
- + /A14* A10
-
- G2 := /A12* A4 ;CONVERT ANALOG TO G2
-
- G3 := A8 ;CONVERT ANALOG TO G2
-
- ; function table vectors go here
-
- FUNCTION TABLE
- /OC CLK A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 G3 G2 G1 G0
-
- ;function table pin list
-
- ; ANALOG INPUTS GREY
- ;CONTROL 111111 OUTPUTS COMMENTS
- ;/OC CLK 543210987654321 3210 FRACTION OF Vmax
- -------------------------------------------------------------------------
- L C LLLLLLLLLLLLLLL LLLL V=0
- L C LLLLLLLLLLLLLLH LLLH V= 1/16
- L C LLLLLLLLLLLLLHH LLHH V= 2/16
- L C LLLLLLLLLLLLHHH LLHL V= 3/16
- L C LLLLLLLLLLLHHHH LHHL V= 4/16
- L C LLLLLLLLLLHHHHH LHHH V= 5/16
- L C LLLLLLLLLHHHHHH LHLH V= 6/16
- L C LLLLLLLLHHHHHHH LHLL V= 7/16
- L C LLLLLLLHHHHHHHH HHLL V= 8/16
- L C LLLLLLHHHHHHHHH HHLH V= 9/16
- L C LLLLLHHHHHHHHHH HHHH V=10/16
- L C LLLLHHHHHHHHHHH HHHL V=11/16
- L C LLLHHHHHHHHHHHH HLHL V=12/16
- L C LLHHHHHHHHHHHHH HLHH V=13/16
- L C LHHHHHHHHHHHHHH HLLH V=14/16
- L C HHHHHHHHHHHHHHH HLLL V=15/16
- H X XXXXXXXXXXXXXXX ZZZZ TEST HI-Z
- -------------------------------------------------------------------------
- DESCRIPTION
- The 4-bit flash analog-to-digital converter converts an analog signal
- into a 4-bit gray code. Gray code is chosen to eliminate glitches at
- binary roll over points.
-
- The maximinum sample rate is equal to 1/tpd of the PAL20X4. Note that no
- feedback propagation delay is introduced.
-