ADS7800_14 Datasheet, PDF (4/21 Pages) Texas Instruments – 12-Bit 3μs Sampling ANALOG-TO-DIGITAL CONVERTER

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