ADS774H datasheet(12/23 Pages) TI1

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DEVICE OPERATION

BASIC OPERATION

DB11(MSB)

DB10

DB9

DB8

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0(LSB)

Status

Output

ConvertCommand

+5V

10 F

50W

+5V

LeaveUnconnected

(1)

(2)

ADS774H

NOTES(1):Notinternallyconnected.

(2):ConnecttoGNDorV

forEmulationMode.

Connectto+5VforControlMode.

10V

Analog

Input

ADS774H

SBAS443 – AUGUST 2009 ................................................................................................................................................................................................ www.ti.com

data output pins into a high-Z state and inhibits the

input lines. This condition means that pulses on pin 5

Figure 12 shows the minimum connections required

are ignored, so that new conversions cannot be

to operate the ADS774H in a basic ±10V range in the

initiated during the conversion, either as a result of

Control Mode (discussed in detail in the section,

spurious signals or to short-cycle the ADS774H.

Sample/Hold

(S/H)

Control

Mode

and

ADC774

Emulation Mode). The falling edge of a Convert

The ADS774H begins acquiring a new sample as

Command (a pulse that takes pin 5 low for a

soon as the conversion completes, even before the

minimum of 25ns) initiates two actions: first, it

STATUS output falls, and tracks the input signal until

switches the ADS774H input to the hold state;

the next conversion is started. The ADS774H is

second, it begins the conversion process. Pin 28

designed to complete a conversion and accurately

(STATUS) outputs high during the conversion, and

acquire a new signal in 8.5

µs (max) over the full

falls only after the conversion is completed and the

operating temperature range, so that conversions can

data have been latched on the data output pins (pins

take place at a full 117kHz.

16 to 27). Thus, the falling edge of STATUS on pin

28 can be used to read the data from the conversion.

Also, during conversion, the STATUS signal puts the

Figure 12. Basic ±10V Operation

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