Differential Nonlinearity: Ideally, any two adjacent digitalcodes correspond to output analog voltages that are exactlyone LSB apart. Differential non-linearity is a measure of theworst case deviation from the ideal 1 LSB step. For example,a DAC with a 1.5 LSB output change for a 1 LSB digital codechange exhibits 1⁄2 LSB differential non-linearity. Differentialnon-linearity may be expressed in fractional bits or as a percentageof full scale. A differential non-linearity greater than1 LSB will lead to a non-monotonic transfer function in aDAC.Gain Error (Full Scale Error): The difference between theoutput voltage (or current) with full scale input code and theideal voltage (or current) that should exist with a full scale inputcode.Gain Temperature Coefficient (Full Scale TemperatureCoefficient): Change in gain error divided by change in temperature.Usually expressed in parts per million per degreeCelsius (ppm/°C).Integral Nonlinearity (Linearity Error): Worst case deviationfrom the line between the endpoints (zero and full scale).Can be expressed as a percentage of full scale or in fractionof an LSB.LSB (Lease-Significant Bit): In a binary coded system thisis the bit that carries the smallest value or weight. Its value isthe full scale voltage (or current) divided by 2n, where n is theresolution of the converter.Monotonicity: A monotonic function has a slope whose signdoes not change. A monotonic DAC has an output thatchanges in the same direction (or remains constant) for eachincrease in the input code. the converse is true for decreasing codes.
標(biāo)簽： Converters Defini DAC
上傳時(shí)間： 2013-10-30
上傳用戶：stvnash
隨著科學(xué)技術(shù)的不斷發(fā)展，人們的生活水平的不斷提高，通信技術(shù)的不斷擴(kuò)延，計(jì)算機(jī)已經(jīng)涉及到各個(gè)不同的行業(yè)，成為人們生活、工作、學(xué)習(xí)、娛樂不可缺少的工具。而計(jì)算機(jī)主板作為計(jì)算機(jī)中非常重要的核心部件，其品質(zhì)的好壞直接影響計(jì)算機(jī)整體品質(zhì)的高低。因此在生產(chǎn)主板的過程中每一步都是要嚴(yán)格把關(guān)的，不能有絲毫的懈怠，這樣才能使其品質(zhì)得到保證。 基于此，本文主要介紹電腦主板的SMT生產(chǎn)工藝流程和F/T(Function Test)功能測(cè)試步驟（F/T測(cè)試步驟以惠普H310機(jī)種為例）。讓大家了解一下完整的計(jì)算機(jī)主板是如何制成的，都要經(jīng)過哪些工序以及如何檢測(cè)產(chǎn)品質(zhì)量的。 本文首先簡(jiǎn)單介紹了PCB板的發(fā)展歷史，分類，功能及發(fā)展趨勢(shì)，SMT及SMT產(chǎn)品制造系統(tǒng)，然后重點(diǎn)介紹了SMT生產(chǎn)工藝流程和F/T測(cè)試步驟。
標(biāo)簽： 電腦主板 生產(chǎn)工藝 流程
上傳時(shí)間： 2013-11-06
上傳用戶：paladin
|Introduction Basic Concept Tips to layout Power circuit Type of Power circuit Basic Concept Maximum Current calculation Resistance of Copper ideal power supply & noise Capacitor & Inductor Power consumption Function of power circuit
標(biāo)簽： PCB 電源設(shè)計(jì)
上傳時(shí)間： 2014-01-04
上傳用戶：kao21
特點(diǎn)（FEATURES） 精確度0.2%滿刻度±0.5℃（冷接點(diǎn)補(bǔ)償）（Accuracy 0.2%F.S.±0.5℃（CJC）） 高精確度冷接點(diǎn)溫度補(bǔ)償（CJC traceability＜±0.5℃（0-70℃）) 熱電偶誤差補(bǔ)償，與斷線保護(hù)功能（Sensor error compensation(offset) and burnout protection function）) 16 BIT 隔離類
上傳時(shí)間： 2014-12-24
上傳用戶：wojiaohs
特點(diǎn)(FEATURES) 精確度0.1%滿刻度 (Accuracy 0.1%F.S.) 可作各式數(shù)學(xué)演算式功能如:A+B/A-B/AxB/A/B/A&B(Hi or Lo)/|A| (Math functioA+B/A-B/AxB/A/B/A&B(Hi&Lo)/|A|/etc.....) 16 BIT 類比輸出功能(16 bit DAC isolating analog output function) 輸入/輸出1/輸出2絕緣耐壓2仟伏特/1分鐘(Dielectric strength 2KVac/1min. (input/output1/output2/power)) 寬范圍交直流兩用電源設(shè)計(jì)(Wide input range for auxiliary power) 尺寸小,穩(wěn)定性高(Dimension small and High stability)
標(biāo)簽： 微電腦 數(shù)學(xué)演算 輸出 隔離傳送器
上傳時(shí)間： 2013-11-24
上傳用戶：541657925
DC/DC 升壓IC：The FP6291 is a current mode boost DC-DC converter. Its PWM circuitry with built-in 0.25 Ω power MOSFET make this regulator highly power efficient. The internal compensation network also minimizes as much as 6 external component counts. The non-inverting input of error amplifier connects to a 0.6V precision reference voltage and internal soft-start function can reduce the inrush current. The FP6291 is available in the SOT23-6L package and provides space-saving PCB for the application fields.
上傳時(shí)間： 2013-11-07
上傳用戶：3294322651
The LTC®3610 is a high power monolithic synchronousstep-down DC/DC regulator that can deliver up to 12Aof continuous output current from a 4V to 24V (28Vmaximum) input supply. It is a member of a high currentmonolithic regulator family (see Table 1) that featuresintegrated low RDS(ON) N-channel top and bottomMOSFETs. This results in a high effi ciency and highpower density solution with few external components.This regulator family uses a constant on-time valleycurrent mode architecture that is capable of operatingat very low duty cycles at high frequency and with veryfast transient response. All are available in low profi le(0.9mm max) QFN packages.
上傳時(shí)間： 2013-11-07
上傳用戶：moerwang
Telecommunication, satellite links and set-top boxes allrequire tuning a high frequency oscillator. The actualtuning element is a varactor diode, a 2-terminal device thatchanges capacitance as a function of reverse bias voltage.1 The oscillator is part of a frequency synthesizingloop, as detailed in Figure 1. A phase locked loop (PLL)compares a divided down representation of the oscillatorwith a frequency reference. The PLL’s output is levelshifted to provide the high voltage necessary to bias thevaractor, which closes a feedback loop by voltage tuningthe oscillator. This loop forces the voltage controlledoscillator (VCO) to operate at a frequency determined bythe frequency reference and the divider’s division ratio.
標(biāo)簽： 開關(guān)穩(wěn)壓器 低噪聲 上傳時(shí)間： 2013-12-20
上傳用戶：ABCDE
Demonstration circuit 1562A is an engineering toolto design and evaluate the LTC699X-X family ofTimerBlox circuits. The center section of the boardcontains a pre-configured TimerBlox function.DC1562A comes in twelve timing function variationsas outlined in Table 1.Surrounding the center board is a ”playground”prototyping area. The prototyping area has padsfor Dip-8, S8, MS8, or S6 packages with breadboarding connections to each pin and two convenientpower buses and ground bus surrounding theentire area. This area is for conditioning signals tocontrol the timer function and for adding loads controlled in time.
標(biāo)簽： 6994 LTC PCB 參考設(shè)計(jì)
上傳時(shí)間： 2013-10-18
上傳用戶：如果你也聽說
HT45R37 內(nèi)建有Serial Interface Function，其中包括了SPI 和I2C 這兩種串列傳輸模式，本文 以HT45R37 為母體，介紹使用SPI 進(jìn)行資料傳輸?shù)姆椒ê妥⒁馐马?xiàng)
上傳時(shí)間： 2013-11-22
上傳用戶：lz4v4
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