參數(shù)資料
型號(hào)： EVAL-AD5415EB
廠商： Analog Devices, Inc.
英文描述： Dual 12-Bit, High Bandwidth, Multiplying DAC with 4-Quadrant Resistors and Serial Interface
中文描述： 雙12位，高帶寬，乘法DAC，具有4象限電阻器和串行接口
文件頁(yè)數(shù)： 17/28頁(yè)
文件大?。?/td> 868K
代理商： EVAL-AD5415EB
AD5415
SINGLE-SUPPLY APPLICATIONS
VOLTAGE SWITCHING MODE OF OPERATION
Figure 35 shows these DACs 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). 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 28
0
V
OUT
V
DD
GND
V
IN
I
OUT
2
I
OUT
1
R
FB
V
DD
V
REF
R
2
R
1
NOTES
1. SIMILAR CONFIGURATION FOR DACB
2. C1 PHASE COMPENSATION (1pF TO 2pF) MAY BE REQUIRED
IF A1 IS A HIGH SPEED AMPLIFIER.
Figure 35. Single-Supply Voltage Switching Mode
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 is turned on, exceeding
the maximum ratings of the device. In this type of application,
the full range of multiplying capability of the DAC 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 resistors’ 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 36.
V
DD
R
FB
I
OUT
1
I
OUT
2
C1
V
OUT
= 0 TO +2.5V
GND
V
DD
= 5V
V
REF
NOTES:
1
ADDITIONAL PINS OMITTED FOR CLARITY.
2
C1 PHASE COMPENSATION (1pF TO 2pF) MAY BE REQUIRED,
IF A1 IS A HIGH SPEED AMPLIFIER.
1/2 AD8552
12-BIT DAC
1/2 AD8552
ADR03
V
OUT
GND
V
IN
–5V
+5V
–2.5V
0
Figure 36. 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 causes mismatches in the
temperature coefficients, resulting in larger gain temperature
coefficient errors. Instead, the circuit in Figure 37 is a recom-
mended method of increasing the gain of the circuit. R
1
, R
2
, and
R
3
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
DD
R
FB
I
OUT
1
I
OUT
2
C1
GND
V
DD
V
REF
NOTES:
1
ADDITIONAL PINS OMITTED FOR CLARITY.
2
C1 PHASE COMPENSATION (1pF TO 2pF) MAY BE REQUIRED,
IF A1 IS A HIGH SPEED AMPLIFIER.
12-BIT DAC
V
IN
R2
R3
R2
V
OUT
R1 =
R2R3
R2 + R3
GAIN =RR2
0
Figure 37. Increasing the Gain of the Current Output DAC
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 38, then the output voltage is
inversely proportional to the digital input fraction,
D
. For
D
equal to 1 2
n
, the output voltage is
V
OUT
=
V
IN
/
D
=
V
IN
/(1 2
n
)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-AD5415EBZ 制造商:Analog Devices 功能描述:Evaluation Board For Dual 12-Bit, High Bandwidth, Multiplying DAC With 4-Quadrant Resistors And Serial Interface 制造商:Analog Devices 功能描述:DUAL 12-BIT, HIGH BANDWIDTH, MULTIPLYING DAC W/ 4-QUADRANT R - Bulk
EVAL-AD5415SDZ 功能描述:BOARD EVAL FOR AD5415 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581
EVAL-AD5420EBZ 功能描述:BOARD EVALUATION FOR AD5420 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581
EVAL-AD5421SDZ 功能描述:BOARD EVAL FOR AD5421 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581
EVAL-AD5422EBZ 功能描述:BOARD EVAL FOR AD5422 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581
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