參數(shù)資料
型號(hào)： AD5439
廠商： Analog Devices, Inc.
元件分類(lèi)： 串行DAC
英文描述： Dual 10-Bit High Bandwidth Multiplying DACs with Serial Interface
中文描述： 雙通道、10位、高帶寬、串行接口乘法DAC
文件頁(yè)數(shù)： 17/32頁(yè)
文件大?。?/td> 860K
代理商： AD5439
AD5429/AD5439/AD5449
SINGLE-SUPPLY APPLICATIONS
Voltage-Switching Mode
Figure 39 shows the DACs operating in 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). Therefore, 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 impedance source.
Rev. 0 | Page 17 of 32
Note that V
IN
is limited to low voltages, because the switches in
the DAC ladder no longer have the same source-drain drive
voltage. As a result, their on resistance differs and this degrades
the integral linearity of the DAC. Also, V
IN
must not go negative
by more than 0.3 V or an internal diode turns on, exceeding the
maximum ratings of the device. In this type of application, the
DAC’s full range of multiplying capability is lost.
POSITIVE OUTPUT VOLTAGE
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’s 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 40.
V
OUT
V
DD
GND
V
IN
I
OUT
2
I
OUT
1
R
FB
V
DD
V
REF
R
2
R
1
0
NOTES:
1. ADDITIONAL PINS OMITTED FOR CLARITY.
2. C1 PHASE COMPENSATION (1pF–2pF) MAY BE REQUIRED
IF A1 IS A HIGH SPEED AMPLIFIER.
Figure 39. Single-Supply Voltage-Switching Mode
V
OUT
= 0V TO +2.5V
V
DD
= +5V
GND
I
OUT
2
I
OUT
1
R
FB
V
DD
V
REF
C
1
GND
V
IN
V
OUT
ADR03
+
5V
–5V
1/2 AD8552
1/2 AD8552
8-/10-/12-BIT
DAC
–2.5V
0
NOTES
1. ADDITIONAL PINS OMITTED FOR CLARITY.
2. C1 PHASE COMPENSATION (1pF–2pF) MAY BE REQUIRED
IF A1 IS A HIGH SPEED AMPLIFIER.
Figure 40. Positive Voltage Output with Minimum Components
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