參數(shù)資料
型號(hào)： DAC8820IBDBG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： DAC
英文描述： PARALLEL, WORD INPUT LOADING, 0.5 us SETTLING TIME, 16-BIT DAC, PDSO28
封裝： GREEN, PLASTIC, SSOP-28
文件頁(yè)數(shù)： 7/22頁(yè)
文件大小： 1216K
代理商： DAC8820IBDBG4
www.ti.com
V
OUT
+
D
32, 768 *
1
V
REF
(2)
R2
R1
DAC
Parallel Bus
Input
Register
Control
Logic
DAC
Register
D15
WR
D0
RST
LDAC
REF
R
COM
R1
R
FB
R
OFS
R
FB
R
OFS
V
DD
I
OUT
AGND
DGND
DAC8820
OPA2277
V
REF
U1
OPA2277
V
OUT
C1
U2
Programmable Current Source Circuit
I
L +
(R2
)R3)
R1
R3
V
REF
D
(3)
Z
O
+
R1 R3
(R1)R2)
R1
(R2 )R3 ) * R1 (R2)R3)
(4)
SBAS358D – AUGUST 2005 – REVISED FEBRUARY 2008
Figure 42. Bipolar Output Circuit
A DAC8820 can be integrated into the circuit in Figure 43 to implement an improved Howland current pump for
precise V/I conversions. Bidirectional current flow and high-voltage compliance are two features of the circuit.
With a matched resistor network, the load current of the circuit is shown by Equation 3:
The value of R3 in the previous equation can be reduced to increase the output current drive of U3. U3 can drive
±20 mA in both directions with voltage compliance limited up to 15 V by the U3 voltage supply. Elimination of the
circuit compensation capacitor (C1) in the circuit is not suggested as a result of the change in the output
impedance (ZO), according to Equation 4:
As shown in Equation 4, ZO with matched resistors is infinite and the circuit is optimum for use as a current
source. However, if unmatched resistors are used, ZO is positive or negative with negative output impedance
being a potential cause of oscillation. Therefore, by incorporating C1 into the circuit, possible oscillation problems
are eliminated. The value of C1 can be determined for critical applications; for most applications, however, a
value of several pF is suggested.
Copyright 2005–2008, Texas Instruments Incorporated
15
Product Folder Link(s): DAC8820
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DAC8820IBDBR 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Parallel Inp RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類(lèi)型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
DAC8820IBDBRG4 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Parallel Inp RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類(lèi)型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
DAC8820IC 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:16-Bit, Parallel Input Multiplying Digital-to-Analog Converter
DAC8820ICDB 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Parallel Inp RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類(lèi)型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
DAC8820ICDBG4 功能描述:數(shù)模轉(zhuǎn)換器- DAC 16-Bit Parallel Inp RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類(lèi)型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
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