AD7715ARZ-5 Analog Devices Inc, AD7715ARZ-5 Datasheet - Page 13

• Manufacturer Part Number: AD7715ARZ-5
• Description: IC ADC 16BIT SIGMA-DELTA 16-SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD7715ARZ-5

• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Bits: 16
• Sampling Rate (per Second): 500
• Number Of Converters: 1
• Power Dissipation (max): 9.5mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.50mm Width)
• Resolution (bits): 16bit
• Sampling Rate: 500SPS
• Input Channel Type: Differential
• Supply Voltage Range - Analog: 4.75V To 5.25V
• Supply Current: 1.1mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7715-3EBZ - BOARD EVALUATION FOR AD7715
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

COMMUNICATIONS REGISTER (RS1, RS0 = 0, 0)
The communications register is an eight-bit register from which data can either be read or to which data can be written. All communica-
tions to the part must start with a write operation to the communications register. The data written to the communications register
determines whether the next operation is a read or write operation and to which register this operation takes place. Once the subsequent
read or write operation to the selected register is complete, the interface returns to where it expects a write operation to the communications
register. This is the default state of the interface, and on power-up or after a reset, the AD7715 is in this default state waiting for a write
operation to the communications register. In situations where the interface sequence is lost, if a write operation to the device of sufficient
duration (containing at least 32 serial clock cycles) takes place with DIN high, the AD7715 returns to this default state. Table 7 outlines
the bit designations for the communications register.
Table 7. Communications Register
Table 8.
Bit Name
0/ DRDY
ZERO
RS1, RS0
R/ W
STBY
G1, G0
Table 9. Register Section
RS1
0
0
1
1
Table 10.
G2
0
0
1
1
0/DRDY
Description
For a write operation, a 0 must be written to this bit so that the write operation to the communications register actually takes
place. If a 1 is written to this bit, the part will not clock on to subsequent bits in the register. Instead, it stays at this bit location
until a 0 is written to this bit. Once a 0 is written to this bit, the next 7 bits are loaded to the communications register. For a read
operation, this bit provides the status of the DRDY flag from the part. The status of this bit is the same as the DRDY output pin.
For a write operation, a 0 must be written to this bit for correct operation of the part. Failure to do this results in unspecified
operation of the device. For a read operation, a 0 is read back from this bit location.
Register Selection Bits. These bits select to which one of four on-chip registers the next read or write operation takes place as
shown in Table 9 along with the register size. When the read or write to the selected register is complete, the part returns to
where it is waiting for a write operation to the Communications Register. It does not remain in a state where it continues to
access the selected register.
Read/Write Select. This bit selects whether the next operation
is a read or write operation to the selected register. A 0 indicates a write cycle as the next operation to the appropriate register,
while a 1 indicates a read operation from the appropriate register.
Standby. Writing a 1 to this bit puts the part in its standby or power-down mode. In this mode, the part consumes only
10 μA of power supply current. The part retains its calibration and control word information when in STANDBY. Writing a 0 to
this bit places the part in its normal operating mode. The default value for this bit after power-on or RESET is 0.
Gain Select bits. See Table 10.
RS0
0
1
0
1
ZERO
G1
0
1
0
1
Register
Communications register
Setup register
Test register
Data register
RS1
Gain Setting
1
2
32
128
Rev. D | Page 13 of 40
RS0
R/W
STBY
Register Size
8 bits
8 bits
8 bits
16 bits
G1
AD7715
G0