SP7800AJS datasheet(4/13 Pages) SIPEX

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SP7800ADS/02

SP7800A 12-Bit 3

µs Sampling A/D Converter

24 VSA

23 VSD

22 N.C.

21 BUSY

20 CS

19 R/C

18 HBE

17 D0

16 D1

15 D2

14 D3

13 DGND

IN1 1

IN2

N.C. 3

AGND 4

D11 5

D10

D6 10

D5 11

D4 12

SP7800A

PINOUT

Pin 12 — D

4 — 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

3 — Data Bit 3 if HBE is LOW; Data Bit

11 if HBE is HIGH.

Pin 15 — D

2 — Data Bit 2 if HBE is LOW; Data Bit

10 if HBE is HIGH.

Pin 16 — D

1 — Data Bit 1 if HBE is LOW; Data Bit

9 if HBE is HIGH.

Pin 17 — D

0 — 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.

Pin19—R/C—Read/Convert.Fallingedgeinitiates

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.

Pin22—N.C.—Thispinisnotinternallyconnected.

Pin23—V

SD — 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

2 — ±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

— 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

7 — Data Bit 7 if HBE is LOW; LOW if

HBE is HIGH.

Pin 10 — D

6 — Data Bit 6 if HBE is LOW; LOW if

HBE is HIGH.

Pin 11 — D

5 — 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

µs max over

temperature, and the high-speed sampling input stage

insures a total acquisition and conversion time of 3

µs

maxovertemperature.Precision,laser–trimmedscal-

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