AD7719BRUZ Analog Devices Inc, AD7719BRUZ Datasheet - Page 9

• Manufacturer Part Number: AD7719BRUZ
• Description: Dual 16-Bit & 24-Bit SD ADC
• Manufacturer: Analog Devices Inc

Specifications of AD7719BRUZ

• Number Of Bits: 16/24
• Sampling Rate (per Second): 105
• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 2
• Power Dissipation (max): 4.5mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP (0.173", 4.40mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7719EB - BOARD EVAL FOR AD7719
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

The serial interface can be reset by exercising the RESET input
on the part. It can also be reset by writing a series of 1s on the
DIN input. If a logic 1 is written to the AD7719 DIN line for at
least 32 serial clock cycles, the serial interface is reset. This ensures
that in 3-wire systems, if the interface gets lost, either via a software
error or by some glitch in the system, it can be reset back to a
known state. This state returns the interface to where the AD7719
is expecting a write operation to its Communications register. This
operation resets the contents of all registers to their power-on
reset values.
REV. A
Pin No. Mnemonic
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
IOUT1
IOUT2
AV
AGND
REFIN1(–)
REFIN1(+)
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
REFIN2
P4
P3
DD
Function
Output for Internal 200 µA Excitation Current Source. Current source IEXC1 and/or IEXC2 can be
switched to this output.
Output for Internal 200 µA Excitation Current Source. Current source IEXC1 and/or IEXC2 can be
switched to this output.
Analog Supply Voltage.
Analog Ground.
Negative Reference Input for Main ADC Channel. This reference input can lie anywhere between AGND
and AV
Positive Reference Input for Main ADC Channel. REFIN1(+) can lie anywhere between AV
AGND + 1 V. The nominal reference voltage (REFIN1(+) – REFIN1(–)) is 2.5 V, but the part is functional
with a reference range from 1 V to AV
Analog Input. AIN1 is dedicated to the main channel.
Analog Input. AIN2 is dedicated to the main channel.
Analog Input. AIN3 can be multiplexed to either the main or auxiliary channel.
Analog Input. AIN4 can be multiplexed to either the main or auxiliary channel.
Analog Input. AIN5 is dedicated to the auxiliary channel and is referenced to AIN6 or AGND.
Analog Input. AIN6 is dedicated to the auxiliary channel. It forms a differential input pair with AIN5 in
fully differential input mode or is referenced to AGND in pseudodifferential mode.
Single-Ended Reference Input for Auxiliary Channel. The nominal input reference is 2.5 V. The auxiliary
channel will function with an input reference range from 1 V to AV
General-Purpose I/O Bit. The input and output voltage levels are referenced to AV
General-Purpose I/O Bit. The input and output voltage levels are referenced to AV
DD
– 1 V.
PIN FUNCTION DESCRIPTIONS
REFIN1(–)
REFIN1(+)
REFIN2
PIN CONFIGURATION
IOUT1
IOUT2
AGND
AV
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
DD
P4
10
12
13
14
1 1
1
2
3
4
5
6
7
8
9
(Not to Scale)
AD7719
TOP VIEW
–9–
DD
.
Some microprocessor or microcontroller serial interfaces have a
single serial data line. In this case, it is possible to connect the
AD7719’s DATA OUT and DATA IN lines together and connect
them to the single data line of the processor. A 10 kΩ pull-up
resistor should be used on this single data line. In this case, if the
interface gets lost, because the read and write operations share
the same line, the procedure to reset it to a known state is
somewhat different than previously described. It requires a read
operation of 24 serial clocks followed by a write operation where
a logic 1 is written for at least 32 serial clock cycles to ensure
that the serial interface is back in a known state.
28
27
26
25
24
23
22
21
20
19
18
17
16
15
XTAL1
XTAL2
DV
DGND
DIN
DOUT
RDY
CS
SCLK
RESET
P1/SW1
PWRGND
P2/SW2
P3
DD
DD
.
DD
DD
and AGND.
and AGND.
AD7719
DD
and