SP7800ADS/02
SP7800A 12-Bit 3
μ
s Sampling A/D Converter
4
Copyright 2000 Sipex Corporation
24 V
SA
23 V
SD
22 N.C.
21 BUSY
20 CS
19 R/C
18 HBE
17 D
0
16 D
1
15 D
2
14 D
3
13 DGND
IN
1
1
IN
2
2
N.C. 3
AGND 4
D
11
5
D
10
6
D
9
7
D
8
8
D
7
9
D
6
10
D
5
11
D
4
12
SP7800A
PINOUT
Pin 12 — D
— Data Bit 4 if HBE is LOW; LOW if
HBE is HIGH.
Pin 13 — DGND — Digital Ground. Connect to pin
4 at the device.
Pin 14 — D
— Data Bit 3 if HBE is LOW; Data Bit
11 if HBE is HIGH.
Pin 15 — D
— Data Bit 2 if HBE is LOW; Data Bit
10 if HBE is HIGH.
Pin 16 — D
— Data Bit 1 if HBE is LOW; Data Bit
9 if HBE is HIGH.
Pin 17 — D
— Data Bit 0 if HBE is LOW. Least
Significant Bit (LSB). Data Bit 8 if HBE is HIGH.
Pin 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 conver-
sion.
Pin 19 — R/C — Read/Convert. Falling edge initiates
conversion when CS is LOW, HBE is LOW, and
BUSY is HIGH.
Pin 20 — CS — Chip Select. Outputs in Hi-Z state
when HIGH. Must be LOW to initiate conversion or
read data.
Pin 21 — BUSY . Output LOW during conversion.
Data valid on rising edge in Convert Mode.
Pin 22 — N.C. — This pin is not internally connected.
Pin 23 — V
— Positive Digital Power Supply, +5V.
Connect to pin 24, and bypass to DGND.
Pin 24 — V
— Positive Analog Power Supply.
+5V. Connect to pin 23, and bypass to AGND.
PIN ASSIGNMENT
Pin 1 — IN
1
—
±
10V Analog Input. Connected to
AGND for
±
5V range.
Pin 2 — IN
—
±
5V Analog Input. Connected to
AGND for
±
10V range.
Pin 3 — N.C. — This pin is not internally connected.
Pin 4 — AGND — Analog Ground. Connect to pin
13 at the device.
Pin 5 — D
11
— Data Bit 11. Most Significant Bit
(MSB).
Pin 6 — D
10
— Data Bit 10.
Pin 7 — D
9
— Data Bit 9.
Pin 8 — D
8
— Data Bit 8.
Pin 9 — D
— Data Bit 7 if HBE is LOW; LOW if
HBE is HIGH.
Pin 10 — D
— Data Bit 6 if HBE is LOW; LOW if
HBE is HIGH.
Pin 11 — D
— Data Bit 5 if HBE is LOW; LOW if
HBE is HIGH.
FEATURES...
The
SP7800A
is specified at a 333kHz sampling rate.
Conversion time is factory set for 2.70
μ
s max over
temperature, and the high-speed sampling input stage
insures a total acquisition and conversion time of 3
μ
s
max over temperature. Precision, laser–trimmed scal-