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參數資料
| 型號： | AD7845AR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | LC2MOS Complete 12-Bit Multiplying DAC |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 2.5 us SETTLING TIME, 12-BIT DAC, PDSO24 |
| 封裝： | SOIC-24 |
| 文件頁數： | 4/12頁 |
| 文件大小： | 193K |
| 代理商： | AD7845AR |
AD7845
REV. B
–4–
PIN CONFIGURATIONS
LCC
PLCC
DIP, SOIC
DIGITAL-TO-ANALOG GLITCH IMPULSE
This is the amount of charge injected from the digital inputs to
the analog output when the inputs change state. This is nor-
mally specified as the area of the glitch in either pA-secs or
nV-secs depending upon whether the glitch is measured as a
current or voltage. The measurement takes place with V
REF
=
AGND.
DIGITAL FEEDTHROUGH
When the DAC is not selected (i.e.,
CS
is high) high frequency
logic activity on the device digital inputs is capacitively coupled
through the device to show up as noise on the V
OUT
pin. This
noise is digital feedthrough.
MULTIPLYING FEEDTHROUGH ERROR
This is ac error due to capacitive feedthrough from the V
REF
terminal to V
OUT
when the DAC is loaded with all 0s.
OPEN-LOOP GAIN
Open-loop gain is defined as the ratio of a change of output
voltage to the voltage applied at the V
REF
pin with all 1s loaded
in the DAC. It is specified at dc.
UNITY GAIN SMALL SIGNAL BANDWIDTH
This is the frequency at which the magnitude of the small signal
voltage gain of the output amplifier is 3 dB below unity. The
device is operated as a closed-loop unity gain inverter (i.e.,
DAC is loaded with all 1s).
OUTPUT RESISTANCE
This is the effective output source resistance.
FULL POWER BANDWIDTH
Full power bandwidth is specified as the maximum frequency, at
unity closed-loop gain, for which a sinusoidal input signal will
produce full output at rated load without exceeding a distortion
level of 3%.
TERMINOLOGY
LEAST SIGNIFICANT BIT
This is the analog weighting of 1 bit of the digital word in a
DAC. For the AD7845, 1 LSB =
V
REF
2
12
.
RELATIVE ACCURACY
Relative accuracy or endpoint nonlinearity is a measure of the
maximum deviation from a straight line passing through the
endpoints of the DAC transfer function. It is measured after
adjusting for both endpoints (i.e., offset and gain error are ad-
justed out) and is normally expressed in least significant bits or
as a percentage of full-scale range.
DIFFERENTIAL NONLINEARITY
Differential nonlinearity is the difference between the measured
change and the ideal 1 LSB change between any two adjacent
codes. A specified differential nonlinearity of +1 LSB max over
the operating temperature range ensures monotonicity.
GAIN ERROR
Gain error is a measure of the output error between an ideal
DAC and the actual device output with all 1s loaded after offset
error has been adjusted out. Gain error is adjustable to zero
with an external potentiometer. See Figure 13.
ZERO CODE OFFSET ERROR
This is the error present at the device output with all 0s loaded
in the DAC. It is due to the op amp input offset voltage and
bias current and the DAC leakage current.
TOTAL HARMONIC DISTORTION
This is the ratio of the root-mean-square (rms) sum of the har-
monics to the fundamental, expressed in dBs.
OUTPUT NOISE
This is the noise due to the white noise of the DAC and the
input noise of the amplifier.
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| AD7845JP | LC2MOS Complete 12-Bit Multiplying DAC |
| AD7845JR | LC2MOS Complete 12-Bit Multiplying DAC |
相關代理商/技術參數 |
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| AD7845ARZ | 功能描述:IC DAC 12BIT MULT LC2MOS 24SOIC RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 產品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設置時間:7µs 位數:16 數據接口:并聯 轉換器數目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應商設備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
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| AD7845BR | 制造商:Analog Devices 功能描述:DAC 1-CH R-2R 12-bit 24-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:12-BIT PARALLEL VOUT DAC, IC - Bulk |
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| AD7845JN | 功能描述:IC DAC 12BIT MULTIPLYING 24-DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 標準包裝:2,400 系列:- 設置時間:- 位數:18 數據接口:串行 轉換器數目:3 電壓電源:模擬和數字 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-TFBGA 供應商設備封裝:36-TFBGA 包裝:帶卷 (TR) 輸出數目和類型:* 采樣率（每秒）:* |
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