AD5333BRU Analog Devices Inc, AD5333BRU Datasheet - Page 16

• Manufacturer Part Number: AD5333BRU
• Description: IC DAC 10BIT DUAL VOUT 24-TSSOP
• Manufacturer: Analog Devices Inc

Specifications of AD5333BRU

• Rohs Status: RoHS non-compliant
• Settling Time: 7µs
• Number Of Bits: 10
• Data Interface: Parallel
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 2.25mW
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP

AD5332/AD5333/AD5342/AD5343
SUGGESTED DATABUS FORMATS
In most applications GAIN and BUF are hard-wired. However,
if more flexibility is required, they can be included in a databus.
This enables you to software program GAIN, giving the option
of doubling the resolution in the lower half of the DAC range.
In a bused system GAIN and BUF may be treated as data inputs
since they are written to the device during a write operation and
take effect when LDAC is taken low. This means that the refer-
ence buffers and the output amplifier gain of multiple DAC
devices can be controlled using common GAIN and BUF lines.
The AD5333 and AD5342 databuses must be at least 10, and
12 bits wide respectively, and are best suited to a 16-bit data-
bus system.
Examples of data formats for putting GAIN and BUF on a 16-
bit databus are shown in Figure 32. Note that any unused bits
above the actual DAC data may be used for BUF and GAIN.
APPLICATIONS INFORMATION
Typical Application Circuits
The AD5332/AD5333/AD5342/AD5343 can be used with a
wide range of reference voltages, especially if the reference inputs
are configured to be unbuffered, in which case the devices offer
full, one-quadrant multiplying capability over a reference range
of 0.25 V to V
fixed, precision reference voltage. Figure 33 shows a typical
setup for the devices when using an external reference connected to
the unbuffered reference inputs. If the reference inputs are unbuf-
fered, the reference input range is from 0.25 V to V
on-chip reference buffers are used, the reference range is reduced.
Suitable references for 5 V operation are the AD780 and REF192.
For 2.5 V operation, a suitable external reference would be the
AD589, a 1.23 V bandgap reference.
X
X
X = UNUSED BIT
X
AD589 WITH V
Figure 33. AD5332/AD5333/AD5342/AD5343 Using
External Reference
*ONLY ONE CHANNEL OF V
X
BUF
Figure 32. GAIN and BUF Data on a 16-Bit Bus
AD780/REF192
WITH V
REF
EXT
X
GAIN
GND
OR
V
X
DD
IN
DD
DB11
V
DD
= 5V
BUF
. More typically, these devices may be used with a
OUT
= 2.5V
GAIN
DB10
DB9
DB9
REF
0.1 F
DB8
DB8
AND V
AD5333
AD5342
DB7
DB7
OUT
V
REF
10 F
DB6
DB6
AD5332/AD5333/
SHOWN
AD5342/AD5343
*
V
DD
DB5
DB5
= 2.5V TO 5.5V
GND
V
DD
DB4
DB4
DB3
DB3
DD
V
DB2
DB2
OUT
, but if the
*
DB1
DB1
DB0
DB0
–16–
Driving V
If an output range of zero to V
inputs are configured as unbuffered, the simplest solution is to
connect the reference inputs to V
very accurate, and may be noisy, the devices may be powered
from the reference voltage, for example using a 5 V reference
such as the ADM663 or ADM666, as shown in Figure 34.
Figure 34. Using an ADM663/ADM666 as Power and Refer-
ence to AD5332/AD5333/AD5342/AD5343
Bipolar Operation Using the AD5332/AD5333/AD5342/AD5343
The AD5332/AD5333/AD5342/AD5343 have been designed
for single supply operation, but bipolar operation is achievable
using the circuit shown in Figure 35. The circuit shown has been
configured to achieve an output voltage range of –5 V < V
+5 V. Rail-to-rail operation at the amplifier output is achievable
using an AD820 or OP295 as the output amplifier.
The output voltage for any input code can be calculated as
follows:
V
where:
D is the decimal equivalent of the code loaded to the DAC, N is
DAC resolution and V
With:
Figure 35. Bipolar Operation using the AD5332/AD5333/
AD5342/AD5343
O
AD589 WITH V
V
R1 = R3 = 10 kΩ
R2 = R4 = 20 kΩ and V
V
*ONLY ONE CHANNEL OF V
AD780/REF192
= [(1 + R4/R3) × (R2/(R1 + R2) × (2 × V
REF
OUT
EXT
REF
WITH V
= 2.5 V
VSET
GND
ADM663/ADM666
= (10 × D/2
V
OR
IN
V
DD
*ONLY ONE CHANNEL OF V
DD
6V TO 16V
OUT
DD
= 5V
GND
from the Reference Voltage
V
= 2.5V
IN
SENSE
V
SHDN
OUT(2)
0.1 F
0.1 F
0.1 F
N
) – 5
0.1 F
REF
REF
AD5332/AD5333/
V
AD5342/AD5343
REF
is the reference voltage input.
AND V
DD
10 F
10 F
V
*
DD
= 5 V.
GND
DD
REF
V
V
V
OUT
= 5V
DD
DD
DD
REF
AND V
is required when the reference
AD5332/AD5333/
AD5342/AD5343
. As this supply may not be
SHOWN
*
V
OUT
10k
R3
OUT
*
REF
GND
10k
R1
SHOWN
× D/2
R2
20k
N
20k
R4
)] – R4 × V
V
+5V
OUT
–5V
*
REV. 0
REF
/R3
O
5V
<