AD5346 Analog Devices, AD5346 Datasheet - Page 19

• Manufacturer Part Number: AD5346
• Description: 2.5 V to 5.5 V, Parallel Interface Octal Voltage Output 8-Bit D/A Converter
• Manufacturer: Analog Devices

Specifications of AD5346

• Resolution (bits): 8bit
• Dac Update Rate: 167kSPS
• Dac Settling Time: 6µs
• Max Pos Supply (v): +5.5V
• Single-supply: Yes
• Dac Type: Voltage Out
• Dac Input Format: Par

APPLICATIONS INFORMATION
TYPICAL APPLICATION CIRCUITS
The AD5346/AD5347/AD5348 can be used with a wide range
of reference voltages, especially if the reference inputs are
configured as 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 41 shows a typical
setup for the devices when using an external reference
connected to the reference inputs. Suitable references for 5 V
operation are the AD780, ADR381, and REF192 (2.5 V refer-
ences). For 2.5 V operation, suitable external references are the
AD589 and the AD1580 (1.2 V band gap references).
*ONLY ONE CHANNEL OF V
DRIVING V
If an output range of 0 V to V
solution is to connect the reference inputs to V
supply may not be very accurate and may be noisy, the devices
can be powered from the reference voltage, for example, by
using a 5 V reference such as the ADM663 or ADM666, as
shown in Figure 42.
OR AD589/AD1580 WITH
AD780/ADR381/REF192
VSET
*ONLY ONE CHANNEL OF V
ADM663/ADM666
EXT
REF
6V TO 16V
WITH V
EXT
REF
Figure 41. AD5346/AD5347/AD5348 Using an External Reference
V
GND
GND
V
DD
IN
GND
V
= 2.5V
SENSE
V
DD
IN
SHDN
OUT(2)
Figure 42. Using an ADM663/ADM666 as Power and
DD
V
= 5V
OUT
. More typically, these devices may be used with a
DD
Reference to the AD5346/AD5347/AD5348
0.1µF
FROM THE REFERENCE VOLTAGE
REF
REF
0.1µF
0.1µF
AND V
10µF
AND V
V
OUT
V
DD
AD5346/AD5347/
OUT
V
REF
DD
REF
is required, the simplest
SHOWN
10µF
*
AD5346/AD5347/
SHOWN
*
AD5348
V
DD
GND
AD5348
= 2.5V to 5.5V
GND
V
DD
V
OUT
*
DD
V
. Because this
OUT
*
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BIPOLAR OPERATION USING THE
AD5346/AD5347/AD5348
The AD5346/AD5347/AD5348 have been designed for single-
supply operation, but a bipolar output range is also possible by
using the circuit shown in Figure 43. This circuit has an output
voltage range of ±5 V. Rail-to-rail operation at the amplifier
output is achievable using an AD820, an AD8519, or an OP196
as the output amplifier.
The output voltage for any input code can be calculated as
follows:
where:
D is the decimal equivalent of the code loaded to the DAC.
N is the DAC resolution.
V
with:
V
R1 = R3 = 10 k Ω
R2 = R4 = 20 k Ω
V
GAIN = 2
*ONLY ONE CHANNEL OF V
EXT
REF
REF
REF
DD
V
OUT
= 5 V
is the reference voltage input.
= 5 V
GND
V
Figure 43. Bipolar Operation with the AD5346/ AD5347/AD5348
IN
= [(1 + R4 / R3 ) × ( R2 /( R1 + R2 ) × (2 × V
V
OUT
0.1µF
0.1µF
V
REF
AD5346/AD5347/
V
OUT
REF
10µF
AND V
R4 × V
= (10 × D /2
*
AD5348
AD5346/AD5347/AD5348
GND
V
5V
DD
OUT
V
REF
SHOWN
10kΩ
OUT
R3
/ R3
*
N
) – 5
10kΩ
R1
R2
20kΩ
20kΩ
R4
+5V
REF
–5V
× D/2
AD820/AD8519/
OP196
N
)] –
±5V