Datasheet

ADS7800
4
SBAS001A
www.ti.com
PIN ASSIGNMENTS
PIN # NAME DESCRIPTION
1IN1±10V Analog Input. Connected to GND for ±5V range.
2IN2±5V Analog Input. Connected to GND for ±10V range.
3 REF +2V Reference Output. Bypass to GND with 22µF to
47µF Tantalum. Buffer for external loads.
4 AGND Analog Ground. Connect to pin 13.
5 D11 Data Bit 11. Most Significant Bit (MSB).
6 D10 Data Bit 10.
7 D9 Data Bit 9.
8 D8 Data Bit 8.
9 D7 Data Bit 7 if HBE is LOW; LOW if HBE is HIGH.
10 D6 Data Bit 6 if HBE is LOW; LOW if HBE is HIGH.
11 D5 Data Bit 5 if HBE is LOW; LOW if HBE is HIGH.
12 D4 Data Bit 4 if HBE is LOW; LOW if HBE is HIGH.
13 DGND Digital Ground. Connect to pin 4.
14 D3 Data Bit 3 if HBE is LOW; Data Bit 11 if HBE is HIGH.
15 D2 Data Bit 2 if HBE is LOW; Data Bit 10 if HBE is HIGH.
16 D1 Data Bit 1 if HBE is LOW; Data Bit 9 if HBE is HIGH.
17 D0 Data Bit 0 if HBE is LOW. Least Significant Bit (LSB);
Data Bit 8 if HBE is HIGH.
18 HBE High Byte Enable. When held LOW, data output as 12
bits in parallel. When held HIGH, four MSBs presented on
pins 14-17, pins 9-12 output LOWs. Must be LOW to
initiate conversion.
19 R/C Read/Convert. Falling edge initiates conversion when CS
is LOW, HBE is LOW, and BUSY is HIGH.
20 CS Chip Select. Outputs in Hi-Z state when HIGH. Must be
LOW to initiate conversion or read data.
21 BUSY Busy. Output LOW during conversion. Data valid on rising
edge in Convert Mode.
22 –V
S
Negative Power Supply. –12V or –15V. Bypass to GND.
23 V
SD
Positive Digital Power Supply. +5V. Connect to pin 24,
and bypass to GND.
24 V
SA
Positive Analog Power Supply. +5V. Connect to pin 23,
and bypass to GND.
PIN CONFIGURATION
Top View DIP/SOIC
1
2
3
4
5
6
7
8
9
10
11
12
IN1
IN2
REF
AGND
D11
D10
D9
D8
D7
D6
D5
D4
24
23
22
21
20
19
18
17
16
15
14
13
V
V
–V
BUSY
CS
R/C
HBE
D0
D1
D2
D3
DGND
SA
SD
S