The output voltage polarity is opposite to the V
參數(shù)資料
型號(hào)： AD5415YRUZ-REEL
廠商： Analog Devices Inc
文件頁數(shù)： 10/29頁
文件大小： 0K
描述： IC DAC 12BIT DUAL MULT 24-TSSOP
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝： 2,500
設(shè)置時(shí)間： 120ns
位數(shù)： 12
數(shù)據(jù)接口： 串行
轉(zhuǎn)換器數(shù)目： 2
電壓電源： 單電源
功率耗散（最大）： 3.5µW
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 24-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 24-TSSOP
包裝： 帶卷 (TR)
輸出數(shù)目和類型： 4 電流，單極；4 電流，雙極
采樣率（每秒）： 2.47M
Data Sheet
AD5415
Rev. E | Page 17 of 28
Positive Output Voltage
The output voltage polarity is opposite to the VREF 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 VOUT and GND pins of the reference become the virtual
ground and 2.5 V, respectively, as shown in Figure 37.
VDD
RFBA
IOUT1A
IOUT2A
C1
VOUT = 0 TO +2.5V
GND
VDD = 5V
VREFA
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
ADR03
VOUT
VIN
GND
–5V
+5V
–2.5V
04461-036
Figure 37. Positive Voltage Output with Minimum of Components
ADDING GAIN
In applications where the output voltage must be greater than VIN,
gain can be added with an additional external amplifier, or it can
be achieved in a single stage. Consider the effect of temperature
coefficients of the thin film resistors of the DAC. Simply placing
a resistor in series with the RFB resistor causes mismatches in the
temperature coefficients, resulting in larger gain temperature
coefficient errors. Instead, the circuit in Figure 38 shows the
recommended method for increasing the gain of the circuit.
R1, R2, and R3 should 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.
VDD
RFBA
IOUT1A
IOUT2A
C1
GND
VDD
VREFA
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
VIN
R1
R3
R2
VOUT
R1 =
R2R3
R2 + R3
GAIN =
R2 + R3
R2
04461-037
Figure 38. Increasing the Gain of the Current Output DAC
DIVIDER OR PROGRAMMABLE GAIN ELEMENT
Current-steering DACs are very flexible and lend themselves to
many applications. If this type of DAC is connected as the
feedback element of an op amp and RFB is used as the input
resistor, as shown in Figure 39, the output voltage is inversely
proportional to the digital input fraction, D.
For D equal to 1 2n, the output voltage is
VOUT = VIN/D = VIN/(1 2n)
VIN
NOTES
1. ADDITIONAL PINS OMITTED FOR CLARITY.
VREFA
VDD
RFBA
IOUT1A
IOUT2A
GND
VOUT
04461-038
Figure 39. 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 amplifier does not saturate and that the required accuracy is
met. For example, an 8-bit DAC driven with the binary code 0x10
(0001 0000)—that is, 16 decimal—in the circuit of Figure 39
should cause the output voltage to be 16 times VIN. However, if
the DAC has a linearity specification of ±0.5 LSB, D can have a
weight in the range of 15.5/256 to 16.5/256, so that the possible
output voltage is in the range of 15.5 VIN to 16.5 VIN—an error of
3%, even though the DAC itself has a maximum error of 0.2%.
DAC leakage current is also a potential source of errors in
divider circuits. The leakage current must be counterbalanced
by an opposite current supplied from the op amp through the
DAC. Because only a fraction, D, of the current into the VREFA
terminal is routed to the IOUT1A terminal, the output voltage
changes as follows:
Output Error Voltage Due to DAC Leakage = (Leakage × R)/D
where R is the DAC resistance at the VREFA terminal.
For a DAC leakage current of 10 nA, R = 10 k, and a gain (that
is, 1/D) of 16, the error voltage is 1.6 mV.
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