TLC32071 Datasheet, PDF (6/15 Pages) Texas Instruments – HIGH-SPEED 8-BIT A/D AND D/A CONVERTER WITH 8-CHANNEL MULTIPLEXER

TLC32071
HIGHĆSPEED 8ĆBIT A/D AND D/A CONVERTER
WITH 8ĆCHANNEL MULTIPLEXER
SLAS051−D3973, DECEMBER 1991
Table 1. Data Word Formats (Channel Range Selection)
D1 D0
LL
LH
HL
HH
A0/A1 CHANNEL
PROGRAMMABLE GAIN
No range selection
Range is set to 1
Range is set to 1/2
Range is set to 1/4
DATA DESTINATION
Higher-order bits are sent to REF-MUX register
Higher-order bits are sent to ADC channel-select register
INPUT FULL SCALE RANGE
(ANLG COM=5) MIN MAX
ANLG COM ± 4 V 1 V 9 V
ANLG COM ± 2 V 3 V 7 V
ANLG COM ± 1 V 4 V 6 V
Table 2. Data Word Formats (RANGE/ADC-Multiplexer Channel Selection)
(Data chosen from this table is only valid when data bits D1 and D0 are not both low)
SELECTED CHANNEL
A0
A1
A2
A3
A4
A5
A6
A7
D7 D6 D5 D4 D3 D2
XXXL L L
XXXL LH
XXXLHL
XXX LHH
XXXHL L
XXXHLH
X X XHH L
XXXHHH
Table 3. Data Word Formats (DAC Output Range Selection)
(Data chosen from this table is only valid when data bits D1 and D0 are not both low)
D6 D5
LX
HL
HH
DAC OUTPUT RANGE
Range is set to 1
Range is set to 1/2
Range is set to 1/4
OUTPUT FULL SCALE RANGE
(ANLG COM=5)
MIN MAX
ANLG COM ± 4 V
1V
9V
ANLG COM ± 2 V
3V
7V
ANLG COM ± 1 V
4V
6V
Table 4. Data Word Formats (REF-Multiplexer Channel Selection)
(Data chosen from this table is valid only when data bits D1 and D0 are both low)
SELECTED CHANNEL
D6 D5 D4 D3 D2
Vref _{(2.5 V nom)}
Bandgap (ACOM + 1.25 V)
XXL L L
XXL LH
A/D reference (approximately 4.6 V) X X L H L
D/A reference (ANLG COM − 3 V)
A0 amp output†
A1 amp output†
ADC MUX output†
DAC level shift output‡
XX LHH
XXHL L
XXHLH
X XHH L
XXHHH
Enable digital loopback
HXXXX
† _{These signals are outputs of scaling/level-shifting amplifiers. The range of}
these signals is Vref ± 2 V.
‡ _{The unscaled output of the DAC. This analog output is proportional to the}
DAC value with a fixed range of ANLG COM ± 1 V, but inverted relative to
the twos-complement code written to the DAC.
6
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265