參數(shù)資料
型號(hào)： AD5425
廠商： Analog Devices, Inc.
英文描述： 8-Bit, High Bandwidth Multiplying DAC with Serial Interface
中文描述： 8位，高帶寬乘法DAC的串行接口
文件頁(yè)數(shù)： 13/20頁(yè)
文件大?。?/td> 417K
代理商： AD5425
REV. 0
AD5425
–13–
Voltage Switching Mode of Operation
Figure 7 shows this DAC operating in the voltage switching
mode. The reference voltage, V
IN
is applied to the I
OUT
1 pin,
I
OUT
2 is connected to AGND and the output voltage is available
at the V
REF
terminal. In this configuration, a positive reference
voltage results in a positive output voltage making single-supply
operation possible. The output from the DAC is voltage at a
constant impedance (the DAC ladder resistance), thus an op amp
is necessary to buffer the output voltage. The reference input no
longer sees a constant input impedance, but one that varies with
code. So, the voltage input should be driven from a low imped-
ance source.
V
OUT
V
DD
GND
V
IN
I
OUT
2
I
OUT
1
R
FB
V
DD
V
REF
NOTES
1. ADDITIONAL PINS OMITTED FOR CLARITY
2. C1 PHASE COMPENSATION (1pF–2pF) MAY BE REQUIRED
IF A1 IS A HIGH SPEED AMPLIFIER.
R2
R1
A1
Figure 7. Single-Supply Voltage Switching Mode Operation
It is important to note that V
IN
is limited to low voltage because
the switches in the DAC ladder no longer have the same source-
drain drive voltage. As a result, their on resistance differs, which
degrades the linearity of the DAC.
Also, V
IN
must not go nega
tive by more than 0.3 V or an inter-
nal diode will turn on,
exceeding the max ratings of the device.
In this type of application, the full range of multiplying capabil-
ity of the DAC is lost.
POSITIVE OUTPUT VOLTAGE
Note that the output voltage polarity is opposite to the V
REF
polarity for dc reference voltages. To achieve a positive voltage
output, an applied negative reference to the input of the DAC is
preferred over the output inversion through an inverting amplifier
because of the resistor tolerance errors. To generate a negative
reference, the reference can be level shifted by an op amp such
that the V
OUT
and GND pins of the reference become the virtual
ground and –2.5 V respectively, as shown in Figure 8.
V
=
0 TO +2.5V
V
DD
= 5V
GND
I
OUT
2
I
OUT
1
R
FB
V
DD
V
REF
C1
NOTES
1. ADDITIONAL PINS OMITTED FOR CLARITY
2. C1 PHASE COMPENSATION (1pF– 2pF) MAY BE
REQUIRED IF A1 IS A HIGH SPEED AMPLIFIER.
GND
V
IN
V
OUT
ADR03
+5V
–5V
1/2 AD8552
1/2 AD8552
–2.5V
A1
A2
Figure 8. Positive Voltage Output with Minimum
of Components
ADDING GAIN
In applications where the output voltage is required to be greater
than V
IN
, gain can be added with an additional external amplifier
or it can also be achieved in a single stage. It is important to
take into consideration the effect of temperature coefficients of
the thin film resistors of the DAC. Simply placing a resistor in
series with the R
FB
resistor will causing mismatches in the
temperature coefficients resulting in larger gain temperature
coefficient errors. Instead, the circuit of Figure 9 is a recom-
mended method of increasing the gain of the circuit. R1, R2,
and R3 should all have similar temperature coefficients, but
they need not match the temperature coefficients of the DAC.
This approach is recommended in circuits where gains of
greater than 1 are required.
V
OUT
V
DD
GND
I
OUT
2
I
OUT
1
R
FB
V
DD
V
REF
C1
NOTES
1. ADDITIONAL PINS OMITTED FOR CLARITY
2. C1 PHASE COMPENSATION (1pF–2pF) MAY BE
REQUIRED IF A1 IS A HIGH SPEED AMPLIFIER.
R
3
R
2
R2
V
IN
R1 = R2R3
R2 + R3
GAIN = R2 + R3
R2
A1
Figure 9. Increasing Gain of Current Output DAC
USED AS A DIVIDER OR PROGRAMMABLE GAIN
ELEMENT
Current steering DACs are very flexible and lend themselves to
many different applications. If this type of DAC is connected as the
feedback element of an op amp and R
FB
is used as the input resistor
as shown in Figure 10, then the output voltage is inversely pro-
portional to the digital input fraction D. For D = 1 – 2n the output
voltage is
V
–V
/D
–V
/
–
OUT
IN
IN
–n
=
=
(
)
1 2
V
OUT
V
DD
GND
V
IN
I
OUT
2
I
OUT
1
R
FB
V
DD
V
REF
NOTE
ADDITIONAL PINS OMITTED FOR CLARITY
A1
Figure 10. Current Steering DAC Used as a Divider
or Programmable Gain Element
As D is reduced, the output voltage increases. For small values
of the digital fraction D, it is important to ensure that the ampli-
fier does not saturate and also that the required accuracy is met.
For example, an eight bit DAC driven with the binary code 0
x/0
(00010000), i.e., 16 decimal, in the circuit of Figure 10 should
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