參數(shù)資料
型號(hào)： AD5424
廠商： Analog Devices, Inc.
元件分類： 串行DAC
英文描述： Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Serial Interface
中文描述： 雙8 - ，10 - 12位高帶寬倍增DAC的串行接口
文件頁(yè)數(shù)： 17/32頁(yè)
文件大小： 860K
代理商： AD5424
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
相關(guān)PDF資料
PDF描述
AD5426 Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Serial Interface
AD5428 Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Serial Interface
AD5429 Dual 8-Bit High Bandwidth Multiplying DACs with Serial Interface
AD5429YRU Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Serial Interface
AD5429YRU-REEL Dual 8-,10-,12-Bit High Bandwidth Multiplying DACs with Serial Interface
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD5424_1 制造商:AD 制造商全稱:Analog Devices 功能描述:8-/10-/12-Bit, High Bandwidth Multiplying DACs with Parallel Interface
AD5424BRU 制造商:Analog Devices 功能描述:DAC SGL R-2R 8BIT 16TSSOP - Bulk
AD5424YCP 制造商:Analog Devices 功能描述:DAC 1-CH R-2R 8-bit 20-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:8-BIT IOUT DAC PARELLED INT/FACE I.C. - Bulk
AD5424YCP-REEL 制造商:Analog Devices 功能描述:DAC 1-CH R-2R 8-bit 20-Pin LFCSP EP T/R
AD5424YCP-REEL7 制造商:Analog Devices 功能描述:DAC 1-CH R-2R 8-bit 20-Pin LFCSP EP T/R 制造商:Rochester Electronics LLC 功能描述:8-BIT IOUT DAC PARELLED INT/FACE I.C. - Tape and Reel
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