AD5664RBRMZ-3 Analog Devices Inc, AD5664RBRMZ-3 Datasheet - Page 25

• Manufacturer Part Number: AD5664RBRMZ-3
• Description: IC DAC NANO 16BIT 1.25V 10-MSOP
• Manufacturer: Analog Devices Inc
• Series: nanoDAC™r

Specifications of AD5664RBRMZ-3

• Data Interface: Serial
• Settling Time: 4µs
• Number Of Bits: 16
• Number Of Converters: 4
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 6.6mW
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Resolution (bits): 16bit
• Sampling Rate: 220kSPS
• Input Channel Type: Serial
• Supply Current: 950µA
• Digital Ic Case Style: SOP
• No. Of Pins: 10
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD5664REBZ - BOARD EVALUATION FOR AD5664R
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

APPLICATIONS
USING A REFERENCE AS A POWER SUPPLY FOR
THE AD5624R/AD5644R/AD5664R
Because the supply current required by the AD5624R/AD5644R/
AD5664R is extremely low, an alternative option is to use a
voltage reference to supply the required voltage to the part (see
Figure 61). This is especially useful if the power supply is quite
noisy, or if the system supply voltages are at some value other
than 5 V or 3 V, for example, 15 V. The voltage reference outputs
a steady supply voltage for the AD5624R/AD5644R/AD5664R
(see Figure 59). If the low dropout
supply 450 μA of current to the AD5624R/AD5644R/AD5664R
with no load on the output of the DAC. When the DAC output
is loaded, the REF195 also needs to supply the current to the
load. The total current required (with a 5 kΩ load on the DAC
output) is
The load regulation of the REF195 is typically 2 ppm/mA,
resulting in a 2.9 ppm (14.5 μV) error for the 1.45 mA current
drawn from it. This corresponds to a 0.191 LSB error.
BIPOLAR OPERATION USING THE
AD5624R/AD5644R/AD5664R
The AD5624R/AD5644R/AD5664R have been designed for
single-supply operation, but a bipolar output range is also
possible using the circuit in Figure 62. The circuit gives an
output voltage range of ±5 V. Rail-to-rail operation at the
amplifier output is achievable using an
the output amplifier.
The output voltage for any input code can be calculated as
follows:
where D represents the input code in decimal (0 to 65,536).
With V
This is an output voltage range of ±5 V, with 0x0000 corre-
sponding to a −5 V output, and 0xFFFF corresponding to a
+5 V output.
Figure 61. REF195 as Power Supply to the AD5624R/AD5644R/AD5664R
INTERFACE
450 μA + (5 V/5 kΩ) = 1.45 mA
V
V
OUT
OUT
DD
SERIAL
3-WIRE
= 5 V, R1 = R2 = 10 kΩ,
=
=
⎡
⎢
⎣
⎛
⎜
⎝
V
10
65
DD
SYNC
SCLK
,
×
536
DIN
×
D
15V
⎛
⎜
⎝
⎞
⎟
⎠
65
REF195
−
D
,
536
5
V
⎞
⎟
⎠
×
⎛
⎜
⎝
5V
AD5624R/
AD5644R/
AD5664R
R1
REF195
V
R1
+
DD
R2
AD820
⎞
⎟
⎠
−
is used, it must
V
V
OUT
DD
or an
= 0V TO 5V
×
⎛
⎜
⎝
R2
R1
OP295
⎞
⎟
⎠
⎤
⎥
⎦
as
Rev. B | Page 25 of 28
USING AD5624R/AD5644R/AD5664R WITH A
GALVANICALLY ISOLATED INTERFACE
In process control applications in industrial environments, it is
often necessary to use a galvanically isolated interface to protect
and isolate the controlling circuitry from any hazardous common-
mode voltages that might occur in the area where the DAC is
functioning. Isocouplers provide isolation in excess of 3 kV. The
AD5624R/AD5644R/AD5664R use a 3-wire serial logic interface,
so the
required isolation (see Figure 63). The power supply to the part
also needs to be isolated, which is done by using a transformer.
On the DAC side of the transformer, a 5 V regulator provides
the 5 V supply required for the AD5624R/AD5644R/AD5664R.
Figure 63. AD5624R/AD5644R/AD5664R with a Galvanically Isolated Interface
+5V
Figure 62. Bipolar Operation with the AD5624R/AD5644R/AD5664R
DATA
SCLK
ADuM130x
SDI
POWER
10µF
V
V
V
IA
IB
IC
ADuM1300
AD5624R/AD5644R/AD5664R
0.1µF
3-channel digital isolator provides the
V
V
V
V
AD5624R/
AD5644R/
DD
AD5664R
INTERFACE
OA
OB
OC
R1 = 10kΩ
SERIAL
3-WIRE
REGULATOR
V
OUT
5V
SCLK
SYNC
DIN
AD5624R/
AD5644R/
AD5664R
GND
V
AD820/
DD
OP295
R2 = 10kΩ
+5V
–5V
V
10µF
OUT
0.1µF
±5V