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參數(shù)資料
| 型號(hào)： | AD5620ARJ-2REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Single, 12-/14-/16-Bit nanoDAC with 5 ppm/C On-Chip Reference in SOT-23 |
| 中文描述： | SERIAL INPUT LOADING, 8 us SETTLING TIME, 12-BIT DAC, PDSO8 |
| 封裝： | MO-178BA, SOT-23, 8 PIN |
| 文件頁數(shù)： | 21/24頁 |
| 文件大小： | 558K |
| 代理商： | AD5620ARJ-2REEL7 |
AD5620/AD5640/AD5660
APPLICATIONS
USING AN REF19x AS A POWER SUPPLY FOR THE
AD5620/AD5640/AD5660
Because the supply current required by the AD5620/AD5640/
AD5660 is extremely low, an alternative option is to use a REF19x
voltage reference (REF195 for 5 V or REF193 for 3 V) to supply
the required voltage to the part—see Figure 49. 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 REF19x outputs a steady supply voltage for the AD5620/
AD5640/AD5660. If the low dropout REF195 is used, the current
it needs to supply to the AD5660 is 500 μA. This is with no load
on the output of the DAC. When the DAC output is loaded, the
REF195 also must supply the current to the load. The total current
required (with a 5 kΩ load on the DAC output) is
500 μA + (5 V/5 kΩ) = 1.5 mA
Rev. A | Page 21 of 24
The load regulation of the REF195 is typically 2 ppm/mA,
which results in an error of 3 ppm (15 μV) for the 1.5 mA
current drawn from it. This corresponds to a 0.197 LSB error
for the AD5660.
AD5660
3-WIRE
SERIAL
INTERFACE
SYNC
SCLK
DIN
15V
5V
V
OUT
= 0V TO 5V
REF195
0
Figure 49. REF195 as the Power Supply to the AD5660
BIPOLAR OPERATION USING THE AD5660
The AD5660 is designed for single-supply operation, but a
bipolar output range is also possible using the circuit in
Figure 50. Figure 50 gives an output voltage range of ±5 V.
Rail-to-rail operation at the amplifier output is achievable
using an AD820 or an OP295 as the output amplifier.
The output voltage for any input code can be calculated as
×
+
R1
×
×
=
R1
R2
V
R2
R1
D
V
V
DD
DD
O
65536
where
D
represents the input code in decimal (0 to 65,535).
When
V
DD
= 5 V,
R1
=
R2
= 10 kΩ,
×
=
V
O
V
5
65536
10
D
This results in an output voltage range of ±5 V with 0x0000
corresponding to a 5 V output and 0xFFFF corresponding to a
+5 V output.
R2
10k
Ω
0
+5V
–5V
AD820/
OP295
3-WIRE
SERIAL
INTERFACE
+5V
AD5660
V
DD
V
FB
V
OUT
R1
10k
Ω
±5V
0.1
μ
F
10
μ
F
Figure 50. Bipolar Operation with the AD5660
USING THE AD5660 AS AN ISOLATED,
PROGRAMMABLE, 4 TO 20 mA PROCESS
CONTROLLER
In many process-control system applications, 2-wire current
transmitters are used to transmit analog signals through noisy
environments. These current transmitters use a zero-scale signal
current of 4 mA to power the signal conditioning circuitry of
the transmitter. The full-scale output signal in these transmitters
is 20 mA. The converse approach to process control can also be
used, in which a low-power, programmable current source is
used to control remotely located sensors or devices in the loop.
A circuit that performs this function is shown in Figure 51.
Using the AD5660 as the controller, the circuit provides a
programmable output current of 4 to 20 mA, proportional to
the digital code of the DAC. Biasing for the controller is provided
by the ADR02 and requires no external trim for two reasons: first,
the ADR02’s tight initial output voltage tolerance, and second,
the low supply current consumption of both the AD8627 and
the AD5660. The entire circuit, including optocouplers, consumes
less than 3 mA from the total budget of 4 mA. The AD8627
regulates the output current to satisfy the current summation
at the noninverting node of the AD8627.
I
OUT
=
1/
R7
(
V
DAC
× R3
/
R1
+ V
REF
×
R3
/
R2
)
For the values shown in Figure 51,
I
OUT
=
0.2435 μA
×
D +
4 mA
where
D
= 0 ≤ D ≤ 65,535, giving a full-scale output current of
20 mA when the AD5660’s digital code equals 0xFFFF.
Offset trim at 4 mA is provided by P2, and P1 provides the circuit
gain trim at 20 mA. These two trims do not interact because
the noninverting input of the AD8627 is at virtual ground. The
Schottky diode, D1, is required in this circuit to prevent loop
supply power-on transients from pulling the noninverting input
of the AD8627 more than 300 mV below its inverting input.
Without this diode, such transients could cause phase reversal
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