參數(shù)資料
型號： AD5428YRUZ
廠商： Analog Devices Inc
文件頁數(shù)： 11/33頁
文件大小： 0K
描述： IC DAC 8BIT DUAL MULT 20TSSOP
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝： 75
設(shè)置時間： 30ns
位數(shù)： 8
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 2
電壓電源： 單電源
功率耗散（最大）： 3.3µW
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 20-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 20-TSSOP
包裝： 管件
輸出數(shù)目和類型： 2 電流，單極；2 電流，雙極
采樣率（每秒）： 21.3M
產(chǎn)品目錄頁面： 782 (CN2011-ZH PDF)
AD5428/AD5440/AD5447
Data Sheet
Rev. C | Page 18 of 32
Bipolar Operation
In some applications, it may be necessary to generate full 4-quad-
rant multiplying operation or a bipolar output swing. This can
easily be accomplished by using another external amplifier and
some external resistors, as shown in Figure 39. In this circuit, the
second amplifier, A2, provides a gain of 2. Biasing the external
amplifier with an offset from the reference voltage results in full
4-quadrant multiplying operation. The transfer function of this
circuit shows that both negative and positive output voltages are
created as the input data (D) is incremented from Code 0 (VOUT =
VREF) to midscale (VOUT = 0 V) to full scale (VOUT = +VREF).
When connected in bipolar mode, the output voltage is given by
()
REF
n
REF
OUT
V
D
V
×
=
1
2
/
where:
D is the fractional representation of the digital word loaded to
the DAC.
D = 0 to 255 (AD5428)
= 0 to 1023 (AD5440)
= 0 to 4095 (AD5447)
n is the number of bits.
When VIN is an ac signal, the circuit performs 4-quadrant
multiplication. Table 8 shows the relationship between digital
code and the expected output voltage for bipolar operation
using the 8-bit AD5428.
Table 8. Bipolar Code
Digital Input
Analog Output (V)
1111 1111
+VREF (127/128)
1000 0000
0
0000 0001
–VREF (127/128)
0000 0000
–VREF (128/128)
Stability
In the I-to-V configuration, the IOUT of the DAC and the inverting
node of the op amp must be connected as close as possible, and
proper PCB layout techniques must be used. Because every code
change corresponds to a step function, gain peaking may occur
if the op amp has limited gain bandwidth product (GBP) and
there is excessive parasitic capacitance at the inverting node.
This parasitic capacitance introduces a pole into the open-loop
response, which can cause ringing or instability in the closed-
loop applications circuit.
An optional compensation capacitor, C1, can be added in parallel
with RFBA for stability, as shown in Figure 38 and Figure 39. Too
small a value of C1 can produce ringing at the output, whereas
too large a value can adversely affect the settling time. C1 should
be found empirically, but 1 pF to 2 pF is generally adequate for
the compensation.
04462-031
CONTROL
LOGIC
INPUT
BUFFER
DATA
INPUTS
IOUTA
DB0
DAC A/B
CS
R/W
DGND
DB7
DB9
DB11
IOUTB
AGND
AD5428/AD5440/AD5447
LATCH
AGND
8-/10-/12-BIT
R-2R DAC A
8-/10-/12-BIT
R-2R DAC B
POWER-ON
RESET
VDD
VREFA
VINA
(±10V)
VREFB
RFBA
RFBB
R
RR21
VOUTA
R11
VINB
(±10V)
R31
R62
20k
Ω
R5
20k
Ω
R8
20k
Ω
R11
5k
Ω
R12
5k
Ω
R72
10k
Ω
R92
10k
Ω
R102
20k
Ω
C13
AGND
VOUTB
R41
C23
A1
A3
A2
A4
1R1, R2 AND R3, R4 USED ONLY IF GAIN ADJUSTMENT IS REQUIRED. ADJUST R1 FOR VOUTA = 0V WITH CODE 10000000 IN DAC A LATCH.
ADJUST R3 FOR VOUTB = 0V WITH CODE 10000000 IN DAC B LATCH.
2MATCHING AND TRACKING IS ESSENTIAL FOR RESISTOR PAIRS R6, R7 AND R9, R10.
3C1, C2 PHASE COMPENSATION (1pF TO 2pF) MAY BE REQUIRED IF A1/A3 IS A HIGH SPEED AMPLIFIER.
Figure 39. Bipolar Operation (4-Quadrant Multiplication)
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