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參數(shù)資料
| 型號： | AD5311BRT |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 12-bit, 500 MSPS Analog-to-Digital Converter with Buffered Input 80-HTQFP |
| 中文描述： | SERIAL INPUT LOADING, 7 us SETTLING TIME, 10-BIT DAC, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 178K |
| 代理商： | AD5311BRT |
REV. 0
AD5301/AD5311/AD5321
–9–
1ns/DIV
V
2.440
2.455
2.445
2.450
Figure 20. Digital Feedthrough
GENERAL DESCRIPTION
The AD5301/AD5311/AD5321 are single resistor-string DACs
fabricated on a CMOS process with resolutions of 8, 10 and 12
bits respectively. Data is written via a 2-wire serial interface.
They operate from single supplies of +2.5 V to +5.5 V and the
output buffer amplifiers provide rail-to-rail output swing with a
slew rate of 0.7 V/
μ
s. The power-supply (V
DD
) acts as the refer-
ence to the DAC. The devices have three programmable power-
down modes, in which the DAC may be turned off completely
with a high-impedance output, or the output may be pulled low
by an on-chip resistor. See Power-Down section.
DIGITAL-TO-ANALOG SECTION
The architecture of the DAC channel consists of a resistor-
string DAC followed by an output buffer amplifier. The voltage
at the V
DD
pin provides the reference voltage for the DAC.
Figure 21 shows a block diagram of the DAC architecture.
Since the input coding to the DAC is straight binary, the ideal
output voltage is given by:
V
V
D
OUT
DD
N
=
×
2
where:
N
= DAC resolution
D
= decimal equivalent of the binary code which is loaded to the
DAC register:
0–255 for AD5301 (8 Bits)
0–1023 for AD5311 (10 Bits)
0–4095 for AD5321 (12 Bits)
RESISTOR
STRING
OUTPUT BUFFER
AMPLIFIER
DAC
REGISTER
REF(+)
V
OUT
V
DD
REF(–)
Figure 21. DAC Channel Architecture
RESISTOR STRING
The resistor string section is shown in Figure 22. It is simply a
string of resistors, each of value R. The digital code loaded to
the DAC register determines at what node on the string the
voltage is tapped off to be fed into the output amplifier. The
voltage is tapped off by closing one of the switches connecting
the string to the amplifier. Because it is a string of resistors, it is
guaranteed monotonic over all codes.
R
R
R
R
R
TO OUTPUT
AMPLIFIER
Figure 22. Resistor String
OUTPUT AMPLIFIER
The output buffer amplifier is capable of generating output
voltages to within 1 mV from either rail, which gives an output
range of 0.001 V to V
DD
– 0.001 V. It is capable of driving a
load of 2 k
to GND and V
DD
, in parallel with 500 pF to GND.
The source and sink capabilities of the output amplifier can be
seen in Figure 11.
The slew rate is 0.7 V/
μ
s with a half-scale settling time to
±
0.5 LSB (at 8 bits) of 6
μ
s with the output unloaded.
POWER-ON RESET
The AD5301/AD5311/AD5321 are provided with a power-on
reset function, ensuring that they power up in a defined state.
The DAC register is filled with zeros and remains so until a
valid write sequence is made to the device. This is particularly
useful in applications where it is important to know the state of
the DAC output while the device is powering up.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD5311BRT-500RL7 | 制造商:Analog Devices 功能描述:DAC 1-CH Resistor-String 10-bit 6-Pin SOT-23 T/R 制造商:Rochester Electronics LLC 功能描述:I2C 10-BIT, VOUT DAC I.C. - Bulk |
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| AD5311BRTZ-500RL7 | 功能描述:IC DAC 10BIT 2WIRE W/BUF SOT23-6 RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 設(shè)計(jì)資源:Unipolar, Precision DC Digital-to-Analog Conversion using AD5450/1/2/3 8-14-Bit DACs (CN0052) Precision, Bipolar, Configuration for AD5450/1/2/3 8-14bit Multiplying DACs (CN0053) AC Signal Processing Using AD5450/1/2/3 Current Output DACs (CN0054) Programmable Gain Element Using AD5450/1/2/3 Current Output DAC Family (CN0055) Single Supply Low Noise LED Current Source Driver Using a Current Output DAC in the Reverse Mode (CN0139) 標(biāo)準(zhǔn)包裝:10,000 系列:- 設(shè)置時間:- 位數(shù):12 數(shù)據(jù)接口:DSP，MICROWIRE?，QSPI?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 薄型，TSOT-23-8 供應(yīng)商設(shè)備封裝:TSOT-23-8 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:2.7M |
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