EVAL-AD7719-EB Datasheet, PDF (3/21 Pages) Analog Devices – Evaluation Board for the AD7719, 16&24-Bit, Dual Sigma Delta ADC

EVAL-AD7719-EB
LK10
LK11
LK12
LK13
LK14
A
OUT
OUT
OUT
A
The on-board reference (U6) provides the reference voltage for the REFIN1(+) input
of the AD7719.
IOUT1*R10 not used as REFIN1 voltage reference.
IOUT1*R10 not used as REFIN1 voltage reference.
IOUT1*R10 not used as REFIN1 voltage reference.
The on-board reference (U2) provides the reference voltage for the REFIN2 input of the
AD7719.
EVALUATION BOARD INTERFACING
Interfacing to the evaluation board is via either a 9-way d-type connector, J4 or a 36-way centronics connector, J1. The
pin-out for the J4 connector is shown in Fig. 2 and its pin designations are given in Table 2. The pin-out for the J1
connector is shown in Fig. 3 and its pin designations are given in Table 3.
J1 is used to connect the evaluation board to the parallel (printer) port of a PC. Connection is via a standard printer cable.
J4 is used to connect the evaluation to any other system. The evaluation board should be powered up before a cable
is connected to either of these connectors.
1 2 34 ₅
6 78 9
Fig. 2: Pin Configuration for the 9-Way D-Type Connector, J4.
Table 2.:
J4 Pin Description ¹
1 S C L K Serial Clock. The signal on this pin is buffered before being applied to the SCLK pin of the
AD7719.
2 RDY Logic output. This is a buffered version of the signal on the AD7719 RDY pin
3 CS
Chip Select. The signal on this pin is buffered before being applied to the CS pin on the AD7719.
4 RESET Reset Input. Data applied to this pin is buffered before being applied to the AD7719 RESET pin.
5 DIN
Serial Data Input. Data applied to this pin is buffered before being applied to the AD7719 DIN pin.
6 DGND Ground reference point for the digital circuitry. Connects to the DGND plane on the Evaluation board.
7 DOUT Serial Data Output. This is a buffered version of the signal on the AD7719 DOUT pin.
8 DV_DD
Digital Supply Voltage. If no voltage is applied to the board's DV_DD input terminal then the voltage applied
to this pin will supply the DV_DD for the digital buffers.
9 NC
Not Connected.
Note
1 _{An explanation of the AD7719 functions mentioned here is given in Table 3 below as part of the J1 pin descriptions.}
Table 3: 36-Way Connector Pin Description
1
NC
No Connect. This pin is not connected on the evaluation board.
2
DIN
Serial Data Input. Data applied to this pin is buffered before being applied to the
AD7719 DIN pin. Serial Data Input with serial data being written to the input shift
register on the part. Data from this input shift register is transferred to the calibration
or control registers, depending on the register selection bits of the Communications
Register.
3
RESET
Reset Input. The signal on this pin is buffered before being applied to the RESET pin of the
AD7719. RESET is an active low input which resets the control logic, interface logic,
calibration coefficients, digital filter and analog modulator of the part to power-on status.
-3-
Rev. B