AD7853 Analog Devices, AD7853 Datasheet - Page 29

• Manufacturer Part Number: AD7853
• Description: 3 V to 5 V Single Supply, 200 kSPS, 12-Bit, Serial Sampling ADC
• Manufacturer: Analog Devices

Specifications of AD7853

• Resolution (bits): 12bit
• # Chan: 1
• Sample Rate: 200kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (Vref) p-p,Uni (Vref)
• Adc Architecture: SAR
• Pkg Type: DIP,SOIC

REV. B
Interface Mode 1 Configuration
Figure 42 shows the flowchart for configuring the part in
Interface Mode 1. This mode of operation can only enabled by
writing to the control register and setting the 2/3 MODE bit.
Reading and writing cannot take place simultaneously in this
mode as the DIN pin is used for both reading and writing.
Figure 42. Flowchart for Setting Up, Reading and Writing
in Interface Mode 1
SCLK, WRITE TO CONTROL REGISTER
SCLK, READ PREVIOUS CONVERSION
SETTING THE TWO-WIRE MODE
APPLY
AFTER
OR AFTER END OF CONTROL
WAIT APPROXIMATLY 200ns
APPLY
AND CONVST BIT TO 1
RESULT ON DIN PIN
REGISTER WRITE
(IF REQUIRED),
(IF REQUIRED),
RISING EDGE
CURRENT CONVERSION RESULT ON DIN PIN
WAIT 150ms FOR AUTOMATIC CALIBRATION
APPLY
POWER-ON, APPLY CLKIN SIGNAL,
SCLK, WRITE TO CONTROL REGISTER
YES
YES
LOW OR WAIT FOR BUSY BIT = 0
SETTING THE TWO-WIRE MODE
WAIT FOR BUSY SIGNAL TO GO
APPLY
(IF REQUIRED), SCLK, READ
PULSE
CONVERSION
CONVERSION
INTERFACE
SOFTWARE
INITIATE
DURING
SERIAL
START
MODE
READ
DATA
IN
(IF REQUIRED),
?
?
?
NO
NO
1
PIN
–29–
Interface Modes 4 and 5 Configuration
Figure 43 shows the flowchart for configuring the AD7853/
AD7853L in Interface Modes 4 and 5, the self-clocking modes.
In this case it is not recommended to use the software conver-
sion start option. The read and write operations always occur
simultaneously and during conversion.
Figure 43. Flowchart for Setting Up, Reading and Writing
in Interface Modes 4 and 5
SCLK AUTOMATICALLY ACTIVE, READ CURRENT
CONVERSION RESULT ON DOUT PIN, WRITE
WAIT 150ms FOR AUTOMATIC CALIBRATION
TO CONTROL REGISTER ON DIN PIN
LOW AFTER
POWER-ON, APPLY CLKIN SIGNAL,
PULSE
AUTOMATICALLY GOES
INTERFACE
SERIAL
START
MODE
?
AD7853/AD7853L
4, 5
RISING EDGE
PIN