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參數(shù)資料
| 型號： | AD5348 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual 14-bit 65MSPS ADC with serialized LVDS Output 48-VQFN -40 to 85 |
| 中文描述： | 2.5 V至5.5 V，并行接口2.5 V至5.5 V，并行接口 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 949K |
| 代理商： | AD5348 |
AD5346/AD5347/AD5348
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
DD
. More typically, these devices may be used with a
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).
Rev. 0 | Page 19 of 24
AD5346/AD5347/
AD5348
V
OUT
*
0.1
μ
F
V
DD
= 2.5V to 5.5V
V
DD
GND
AD780/ADR381/REF192
WITH V
= 5V
OR AD589/AD1580 WITH
V
DD
= 2.5V
V
REF
*
GND
*ONLY ONE CHANNEL OF V
REF
AND V
OUT
SHOWN
10
μ
F
V
OUT
V
IN
EXT
REF
0
Figure 41. AD5346/AD5347/AD5348 Using an External Reference
DRIVING V
DD
FROM THE REFERENCE VOLTAGE
If an output range of 0 V to V
DD
is required, the simplest
solution is to connect the reference inputs to V
DD
. Because this
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.
AD5346/AD5347/
AD5348
V
OUT
*
0.1
μ
F
6V TO 16V
V
DD
V
REF
*
GND
GND
*ONLY ONE CHANNEL OF V
REF
AND V
OUT
SHOWN
10
μ
F
V
OUT(2)
V
IN
EXT
REF
0.1
μ
F
SENSE
SHDN
VSET
ADM663/ADM666
0
Figure 42. Using an ADM663/ADM666 as Power and
Reference to the AD5346/AD5347/AD5348
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.
5V
EXT
REF
GND
V
OUT
R2
20k
R1
10k
R4
20k
R3
10k
±5V
+5V
–5V
*ONLY ONE CHANNEL OF V
REF
AND V
OUT
SHOWN
0.1
μ
F
0.1
μ
F
10
μ
F
AD820/AD8519/
OP196
V
IN
GND
AD5346/AD5347/
AD5348
V
OUT
*
V
DD
V
REF
*
0
Figure 43. Bipolar Operation with the AD5346/ AD5347/AD5348
The output voltage for any input code can be calculated as
follows:
V
OUT
= [(1 +
R4
/
R3
) × (
R2
/(
R1
+
R2
) × (2 × V
REF
× D/2
N
)] –
R4
×
V
REF
/
R3
where:
D
is the decimal equivalent of the code loaded to the DAC.
N
is the DAC resolution.
V
REF
is the reference voltage input.
with:
V
REF
= 5 V
R1
=
R3
= 10 k
R2
=
R4
= 20 k
V
DD
= 5 V
GAIN = 2
V
OUT
= (10 ×
D
/2
N
) – 5
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