參數資料
| 型號： | DAC8222GPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 13/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 12BIT DUAL W/BUFF 24DIP |
| 產品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 15 |
| 設置時間： | 1µs |
| 位數： | 12 |
| 轉換器數目： | 2 |
| 電壓電源： | 單電源 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 24-DIP（0.300"，7.62mm） |
| 供應商設備封裝： | 24-PDIP |
| 包裝： | 管件 |
| 輸出數目和類型： | 2 電流，單極；2 電流，雙極 |
| 采樣率（每秒）： | 1M |
DAC8222
–7–
REV. C
Figure 18. Burn-In Circuit
PARAMETER DEFINITIONS
RESOLUTION (n)
The resolution of a DAC is the number of states (2
n) into which
the full-scale range (FSR) is divided (or resolved); where n is
equal to the number of bits.
RELATIVE ACCURACY (INL)
Relative accuracy, or integral nonlinearity, is the maximum de-
viation of the analog output (from the ideal) from a straight line
drawn between the end points. It is expressed in terms of least
significant bit (LSB), or as a percent of full scale.
DIFFERENTIAL NONLINEARITY (DNL)
Differential nonlinearity is the worst case deviation of any adja-
cent analog output from the ideal 1 LSB step size. The devia-
tion of the actual “step size” from the ideal step size of 1 LSB is
called the differential nonlinearity error or DNL. DACs with
DNL greater than
±1 LSB may be nonmonotonic ±1/2 LSB
INL guarantees monotonicity and
±1 LSB maximum DNL.
GAIN ERROR (GFSE)
Gain error is the difference between the actual and the ideal
analog output range, expressed as a percent of full-scale or in
terms of LSB value. It is the deviation in slope of the DAC
transfer characteristic from ideal.
See Orientation in Digital-to-Analog Converters Section of the
current data book, for additional parameter definitions.
GENERAL CIRCUIT DESCRIPTION
CONVERTER SECTION
The DAC8222 contains four 12-bit registers (two input regis-
ters and two DAC registers), two highly stable thin-film R-2R
resistor ladder networks, and interface control logic circuitry.
Also included are 24 single-pole, double-throw, NMOS transis-
tor current switches.
Figure 19. Simplified Single DAC Circuit Configuration.
(Switches Are Shown for All Digital Inputs at Zero)
Figure 20. N-Channel Current Steering Switch
Figure 19 shows a simplified circuit for the R-2R ladder network
and transistor switches for one DAC. R is typically 11 k
. The
transistor switches are binarily scaled in size to maintain a con-
stant voltage drop across each switch. Figure 20 shows a single
NMOS transistor switch.
The binary-weighted currents are switched between IOUT and
AGND by the N-channel MOS transistor switches. The selec-
tion between IOUT and AGND is determined by the digital input
code. It is important to note here that the voltage difference
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| DAC8228FP | 功能描述:IC DAC 8BIT DUAL V-OUT 20-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）:* |
| DAC8228FPZ | 功能描述:IC DAC 8BIT DUAL V-OUT 20DIP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 標準包裝:47 系列:- 設置時間:2µs 位數:14 數據接口:并聯 轉換器數目:1 電壓電源:單電源 功率耗散（最大）:55µW 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應商設備封裝:28-SSOP 包裝:管件 輸出數目和類型:1 電流，單極；1 電流，雙極 采樣率（每秒）:* |
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