EVAL-AD5761RSDZ View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
EVAL-AD5761RSDZ
Analog Devices
'EVAL-AD5761RSDZ' PDF : 35 Pages View PDF
AD5761R/AD5721R
APPLICATIONS INFORMATION
TYPICAL OPERATING CIRCUIT
Figure 76 shows the typical operating circuit for the AD5761R/
AD5721R. The only external components needed for this
precision 16-/12-bit DAC are decoupling capacitors on the
supply pins and supply voltage. Because the AD5761R/AD5721R
incorporate a voltage reference and reference buffers, they
eliminate the need for an external bipolar reference and
associated buffers, resulting in overall savings in both cost and
board space.
In Figure 76, VDD is connected to 15 V and VSS is connected to
−15 V, but VDD and VSS can operate with supplies from 4.75 V to
30 V and from −16.5 V to 0 V, respectively.
ALERT
CLEAR
AD5761R/
AD5721R
100nF
1 ALERT DGND 16
+ 10µF
2 CLEAR DVCC 15
+5V
RESET
VREFIN
–15V
VOUT
+15V
100nF
10µF
100nF
10µF
3 RESET SCLK 14
4 VVRREEFFIONU/ T SYNC 13
5 AGND
SDI 12
6 VSS
7 VOUT
8 VDD
LDAC 11
SDO 10
DNC 9
SCLK
SYNC
SDI
LDAC
SDO
NOTES
1. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.
Figure 76. Typical Operating Circuit
Data Sheet
POWER SUPPLY CONSIDERATIONS
The AD5761R/AD5721R must be powered by the following
three supplies to provide any of the eight output voltage ranges
available on the DAC: VDD = 21 V, VSS = −11 V, and DVCC = 5 V.
For applications requiring optimal high power efficiency and
low noise performance, it is recommended to use the ADP5070
switching regulator to convert the 5 V input rail into two
intermediate rails (+23 V and −13 V). These intermediate rails
are then postregulated by very low noise, low dropout (LDO)
regulators (ADP7142 and ADP7182). Figure 77 shows the
recommended method.
+5V INPUT
ADP5070
DC-TO-DC
SWITCHING
REGULATOR
+23V
ADP7142
LDO
ADP7142
LDO
+21V: VDD
+5V: DVCC
+5V INPUT
ADP5070
DC-TO-DC
SWITCHING
REGULATOR
–13V
ADP7182
LDO
–11V: VSS
Figure 77. Postregulation by ADP7142 and ADP7182
EVALUATION BOARD
An evaluation board is available for the AD5761R to aid
designers in evaluating the high performance of the device
with minimum effort. The AD5761R evaluation kit includes a
populated and tested AD5761R printed circuit board (PCB).
The evaluation board interfaces to the USB port of a PC. Software
is available with the evaluation board to allow the user to easily
program the AD5761R. The EVAL-AD5761RSDZ user guide
provides full details on the operation of the evaluation board.
Rev. C | Page 34 of 36
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