AD7853 Analog Devices, AD7853 Datasheet - Page 27

• 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
CONFIGURING THE AD7853/AD7853L
AD7853/AD7853L as a Read-Only ADC
The AD7853/AD7853L contains fourteen on-chip registers
which can be accessed via the serial interface. In the majority of
applications it will not be necessary to access all of these regis-
ters. Figure 38 outlines a flowchart of the sequence which is
used to configure the AD7853/AD7853L as a Read-Only ADC.
APPLY SYNC (IF REQUIRED), SCLK AND READ
WAIT FOR AUTOMATIC CALIBRATION
Figure 40. Flowchart for Setting Up and Reading from the AD7853/AD7853L
POWER-ON, APPLY CLKIN SIGNAL,
CONVERSION RESULT ON DOUT PIN
DIN CONNECTED TO DGND
WAIT FOR BUSY SIGNAL
PULSE CONVST PIN
CONVERSION
INTERFACE
TO GO LOW
DURING
SERIAL
START
MODE
READ
DATA
?
?
NO
2, 3
YES
4, 5
AFTER CONVST RISING EDGE
WAIT APPROXIMATLY 200ns
–27–
In this case there is no writing to the on-chip registers and only
the conversion result data is read from the part. Interface Mode
1 cannot be used in this case as it is necessary to write to the
control register to set Interface Mode 1. Here the CLKIN signal
is applied directly after power-on, the CLKIN signal must be
present to allow the part to perform a calibration. This auto-
matic calibration will be completed approximately 32 ms after
the AD7853 has powered up (4 MHz CLK).
SCLK AUTOMATICALLY ACTIVE, READ
SYNC AUTOMATICALLY GOES LOW
CONVERSION RESULT ON DOUT PIN
AFTER CONVST RISING EDGE
PULSE CONVST PIN
AD7853/AD7853L