AD7914BRUZ Analog Devices Inc, AD7914BRUZ Datasheet - Page 13

• Manufacturer Part Number: AD7914BRUZ
• Description: 10-Bit 4,CH 1 Msps ADC I.C.
• Manufacturer: Analog Devices Inc

Specifications of AD7914BRUZ

• Number Of Bits: 10
• Sampling Rate (per Second): 1M
• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 13.5mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP (0.173", 4.40mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD79X4CBZ - BOARD EVALUATION FOR AD79X4CBZ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CONTROL REGISTER
The Control Register on the AD7904/AD7914/AD7924 is a 12-bit, write-only register. Data is loaded from the DIN pin of the
AD7904/AD7914/AD7924 on the falling edge of SCLK. The data is transferred on the DIN line at the same time that the conver-
sion result is read from the part. The data transferred on the DIN line corresponds to the AD7904/AD7914/AD7924 configuration
for the next conversion. This requires 16 serial clocks for every data transfer. Only the information provided on the first 12 falling
clock edges (after CS falling edge) is loaded to the Control Register. MSB denotes the first bit in the data stream. The bit functions
are outlined in Table I.
Bit
11
10
9–8
7–6
5, 4
3
2
1
0
REV. 0
MSB
WRITE
–0.2
–0.6
–1.0
–0.4
–0.8
1.0
0.8
0.6
0.4
0.2
Mnemonic
WRITE
SEQ1
DONTCARE
ADD1, ADD0 These two address bits are loaded at the end of the present conversion sequence and select which analog
PM1, PM0
SEQ0
DONTCARE
RANGE
CODING
0
0
V
TEMP = 25 C
DD
512
= V
SEQ1 DONTC DONTC
TPC 6. AD7924 Typical INL
DRIVE
1024
= 5V
Comment
The value written to this bit of the Control Register determines whether the following 11 bits will be loaded
to the control register or not. If this bit is a 1 then the following 11 bits will be written to the control register; if it
is a 0 then the remaining 11 bits are not loaded to the control register and so it remains unchanged.
The SEQ1 bit in the control register is used in conjunction with the SEQ0 bit to control the use of the
sequencer function. (See Table IV.)
input channel is to be converted in the next serial transfer, or they may select the final channel in a consecutive
sequence as described in Table IV. The selected input channel is decoded as shown in Table II. The
address bits corresponding to the conversion result are also output on DOUT prior to the 12 bits of data,
see the Serial Interface section. The next channel to be converted on will be selected by the mux on the
fourteenth SCLK falling edge.
Power Management Bits. These two bits decode the mode of operation of the AD7904/AD7914/AD7924
as shown in Table III.
The SEQ0 bit in the control register is used in conjunction with the SEQ1 bit to control the use of the
sequencer function. (See Table IV.)
This bit selects the analog input range to be used on the AD7904/AD7914/AD7924. If it is set to 0 then the
analog input range will extend from 0 V to 2 × REF
from 0 V to REF
This bit selects the type of output coding the AD7904/AD7914/AD7924 will use for the conversion result.
If this bit is set to 0 the output coding for the part will be twos complement. If this bit is set to 1 then the
output coding from the part will be straight binary (for the next conversion).
1536
CODE
2048
2560
IN
3072
(for the next conversion). For 0 V to 2 × REF
Table I. Control Register Bit Functions
ADD1 ADD0
3584
4096
–13–
PM1
IN
–0.2
–0.4
–0.6
–0.8
–1.0
PM0
1.0
0.8
0.6
0.4
0.2
. If it is set to 1 then the analog input range will extend
0
0
V
TEMP = 25 C
DD
512
SEQ0
= V
TPC 7. AD7924 Typical DNL
DRIVE
AD7904/AD7914/AD7924
1024
IN
= 5V
, V
DONTC
DD
1536
= 4.75 V to 5.25 V.
CODE
2048
2560
RANGE
3072
3584
LSB
CODING
4096