LTC2420 SO-8パッケージ、20ビット マイクロパワーno Latency ΔΣ™ adC 特長 SO-8 ■ INL 8ppm 20 20 ■ ■ LTC®2420 2.7V 5.5V A/D 1.2ppm 1 LTC2420 50Hz 4ppm ■ ■ 概要 ADC 0.5ppm 1.2ppm 60Hz 2% 110dB 1 ■ 1Hz ■ 20 INL 8ppm RMS 16 100sps 12 800Hz TUE 内部発振器 － 外付け部品が不要 ■ 最小110db、 50Hz/60Hzのノッチ・フィルタ ■ リファレンス入力電圧：0.1V～VCC ■ ライブ・ゼロ－拡張入力範囲により12.5%の オーバーレンジおよびアンダーレンジに対応可能 ■ 2.7V～5.5V単一電源動作 ■ 低電源電流 （200μa） および自動シャットダウン ■ 24ビットLtC2400とピンコンパチブル ■ 0.1V • VREF 3 秤 ■ 直接温度測定 ■ ガス分析器 ■ 歪みゲージ変換器 ■ 計測 ■ データ収集 ■ 産業用プロセス・コントロール ■ 4桁dVm ■ L、LtC、Ltはリニアテクノロジー社の登録商標です。no Latency ΔΣはリニアテクノロジー社 の商標です。miCrOWireは、 ナショナル・セミコンダクター社の商標です。 標準的応用例 3V 10 2.7V TO 5.5V 6 VCC VCC FO 8 = INTERNAL OSC/50Hz REJECTION = EXTERNAL CLOCK SOURCE = INTERNAL OSC/60Hz REJECTION LTC2420 2 3 4 VREF VIN GND SCK SDO CS 7 4 ERROR (ppm) 1 VCC = 3V VREF = 2.5V 8 1μF ANALOG INPUT RANGE –0.12VREF TO 1.12VREF • VREF1 12.5% MICROWIRE™ LTC2420 SPI アプリケーション REFERENCE VOLTAGE 0.1V TO VCC V CC LTC2420 12.5% 2 0 –2 –4 6 3-WIRE SPI INTERFACE TA = –55°C, –45°C, 25°C, 90°C –6 –8 5 –10 2420 TA01 0 0.5 1.5 2.0 1.0 INPUT VOLTAGE (V) 2.5 2420 G01 1 LTC2420 絶対最大定格 パッケージ/発注情報 Note 1 2 ................................. −0.3V～7V gndに対する電源電圧（VCC） gndに対するアナログ入力電圧 ............ −0.3V～（VCC＋0.3V） gndに対するリファレンス入力電圧 ...... −0.3V～ （VCC＋0.3V） gndに対するデジタル入力電圧 ............ −0.3V～ （VCC＋0.3V） gndに対するデジタル出力電圧 ............ −0.3V～ （VCC＋0.3V） 動作温度範囲 LtC2420C .............................................................0℃～70℃ LtC2420i ......................................................... −40℃～85℃ 保存温度範囲................................................... −65℃～150℃ リード温度 （半田付け、10秒）..........................................300℃ コンバータ特性 TA = 25 ● Order part number TOP VIEW VCC 1 8 FO VREF 2 7 SCK VIN 3 6 SDO GND 4 5 CS LTC2420CS8 LTC2420IS8 S8 Part marking S8 PACKAGE 8-LEAD PLASTIC SO 2420 2420I TJMAX = 125°C, θJA = 130°C/W ミリタリ・グレードに関してはお問い合わせください。 Note 3 4 PARAMETER CONDITIONSMIN TYP MAX Resolution (No Missing Codes) 0.1V ≤ VREF ≤ VCC, (Note 5) UNITS ●20Bits Integral Nonlinearity VREF = 2.5V (Note 6) VREF = 5V (Note 6) ● ● 4 8 10 20 ppm of VREF ppm of VREF Integral Nonlinearity (Fast Mode) VREF = 5V, VREF = 2.5V, 100 Samples/Second, fO = 2.048MHz ● 40 250 ppm of VREF Offset Error 2.5V ≤ VREF ≤ VCC ● 0.5 10 ppm of VREF Offset Error (Fast Mode) 2.5V < VREF < 5V, 100 Samples/Second, fO = 2.048MHz 3 ppm of VREF 0.04 ppm of VREF/°C Offset Error Drift 2.5V ≤ VREF ≤ VCC Full-Scale Error 2.5V ≤ VREF ≤ VCC Full-Scale Error (Fast Mode) 2.5V < VREF < 5V, 100 Samples/Second, fO = 2.048MHz 10 ppm of VREF Full-Scale Error Drift 2.5V ≤ VREF ≤ VCC 0.04 ppm of VREF/°C Total Unadjusted Error VREF = 2.5V VREF = 5V 8 16 ppm of VREF ppm of VREF ● 4 10 ppm of VREF Output Noise VIN = 0V (Note 13) 6 µVRMS Output Noise (Fast Mode) VREF = 5V, 100 Samples/Second, fO = 2.048MHz 20 µVRMS Normal Mode Rejection 60Hz ± 2% (Note 7) ●110 130 dB Normal Mode Rejection 50Hz ±2% (Note 8) ●110 130 dB Power Supply Rejection, DC VREF = 2.5V, VIN = 0V 100 dB Power Supply Rejection, 60Hz ±2% VREF = 2.5V, VIN = 0V, (Notes 7, 15) 110 dB Power Supply Rejection, 50Hz ±2% VREF = 2.5V, VIN = 0V, (Notes 8, 15) 110 dB 2 LTC2420 アナログ入力およびリファレンス ● TA = 25 Note 3 SYMBOL PARAMETER CONDITIONS MIN TYPMAXUNITS VINInput Voltage Range (Note 14) ● – 0.125 • VREF VREFReference Voltage Range 1.125 • VREFV ●0.1 VCCV CS(IN)Input Sampling Capacitance 1 pF CS(REF)Reference Sampling Capacitance 1.5 pF IIN(LEAK)Input Leakage Current CS = VCC ●–100 IREF(LEAK) Reference Leakage Current VREF = 2.5V, CS = VCC ● デジタル入力とデジタル出力 ● TA = 25 –100 1 100 nA 1100 nA Note 3 SYMBOL PARAMETER CONDITIONS MIN TYPMAXUNITS VIH High Level Input Voltage CS, FO ●2.5 2.7V ≤ VCC ≤ 5.5V 2.7V ≤ VCC ≤ 3.3V 2.0 V V VIL Low Level Input Voltage CS, FO ●0.8 4.5V ≤ VCC ≤ 5.5V 2.7V ≤ VCC ≤ 5.5V 0.6 V V VIH High Level Input Voltage SCK ●2.5 2.7V ≤ VCC ≤ 5.5V (Note 9) 2.7V ≤ VCC ≤ 3.3V (Note 9) 2.0 V V VIL Low Level Input Voltage SCK ●0.8 4.5V ≤ VCC ≤ 5.5V (Note 9) 2.7V ≤ VCC ≤ 5.5V (Note 9) 0.6 V V IINDigital Input Current CS, FO 0V ≤ VIN ≤ VCC ●–10 10 µA IINDigital Input Current SCK 0V ≤ VIN ≤ VCC (Note 9) ●–10 10 µA CINDigital Input Capacitance CS, FO 10 pF CINDigital Input Capacitance SCK 10 pF High Level Output VoltageIO = – 800µA VOH SDO ●VCC – 0.5 V Low Level Output VoltageIO = 1.6mA VOL SDO ●0.4 V High Level Output VoltageIO = –800µA (Note 10) VOH SCK ●VCC – 0.5 V Low Level Output VoltageIO = 1.6mA (Note 10) VOL SCK ●0.4 V High-Z Output Leakage IOZ SDO ●–10 電源要件 TA = 25 ● SYMBOL PARAMETER VCC (Note 9) 10 µA Note 3 CONDITIONS MIN TYPMAXUNITS Supply Voltage Supply Current ICC Conversion Mode CS = 0V (Note 12) Sleep Mode CS = VCC (Note 12) ●2.7 5.5 ● ● 200300 2030 V µA µA 3 LTC2420 タイミング特性 ● TA = 25 Note 3 SYMBOL PARAMETER CONDITIONS MIN TYPMAXUNITS fEOSCExternal Oscillator Frequency Range 20-Bit Effective Resolution 12-Bit Effective Resolution ●2.56 307.2 kHz ●2.56 2.048MHz tHEOExternal Oscillator High Period ●0.2 390 tLEOExternal Oscillator Low Period ●0.2 390 µs Conversion Time FO = 0V tCONV FO = VCC External Oscillator (Note 11) ● 130.86 133.53136.20 ● 157.03 160.23163.44 ●20510/fEOSC (in kHz) ms ms ms fISCKInternal SCK FrequencyInternal Oscillator (Note 10) External Oscillator (Notes 10, 11) DISCKInternal SCK Duty Cycle (Note 10) 19.2 fEOSC/8 45 55 µs kHz kHz % fESCKExternal SCK Frequency Range (Note 9) ●2000 kHz tLESCKExternal SCK Low Period (Note 9) ●250 tHESCKExternal SCK High Period (Note 9) ns ●250 ns tDOUT_ISCKInternal SCK 24-Bit Data Output TimeInternal Oscillator (Notes 10, 12) External Oscillator (Notes 10, 11) ● 1.23 1.251.28 ●192/fEOSC (in kHz) ms ms tDOUT_ESCKExternal SCK 24-Bit Data Output Time ●24/fESCK (in kHz) ms t1 CS ↓ to SDO Low Z (Note 9) ●0 150 ns t2 CS ↑ to SDO High Z ●0 150 ns t3 CS ↓ to SCK ↓ (Note 10) ●0 150 ns t4 CS ↓ to SCK ↑ (Note 9) ●50 ns tKQMAXSCK ↓ to SDO Valid ●200 ns tKQMIN SDO Hold After SCK ↓ ●15 ns t5 SCK Set-Up Before CS ↓ ●50 ns t6 SCK Hold After CS ↓ ● 50 ns (Note 5) Note 1 絶対最大定格はそれを超えるとデバイスの寿命が損なわれる可能性がある値。 Note 2 すべての電圧値はgndを基準とする。 Note 9 コンバータはSCkピンをデジタル入力として使用する外部SCk動作モード。 データを出 力している間、SCkをドライブしているクロック信号の周波数はfeSCkで、単位はkHz。 Note 3 電圧はすべてgndを基準にする。 注記がない限り、VCC = 2.7V～5.5V。rSOurCe = 0Ω。 Note 10 コンバータはSCkピンをデジタル出力として使用する内部SCk動作モード。 この動作 モードにおいて、SCkピンの全等価負荷容量CLOadは20pF。 Note 4 注記がない限り、 FOピンをgndまたはVCC、 またはfeOSC = 153600Hzの外部変換クロッ ク・ソースに接続した状態の内部変換クロック・ソース。 Note 11 外部発振器はFOピンに接続する。 外部発振器周波数feOSCの単位はkHz。 Note 5 設計で保証されているが、 テストされていない。 Note 6 積分非直線性は伝達曲線の実際のエンドポイントを通過する直線からのコードの偏 差として定義される。偏差は量子化幅の中心から測定される。 Note 7 FO = 0V （内部発振器） またはfeOSC = 153600Hz±2%（外部発振器） 。 Note 8 FO = VCC （内部発振器） またはfeOSC = 128000Hz±2%（外部発振器）。 4 Note 12 コンバータは内部発振器を使用する。 FO = 0VまたはFO = VCC Note 13 出力ノイズは内部較正動作に付随する部分が含まれる。 Note 14 リファレンス電圧値VreF > 2.5Vの場合、 −0.125 • VreF～1.125 • VreFの拡張入力は、 ア ナログ入力電圧ピン （ピン3） の絶対最大定格によって制限される。2.5V < VreF ≤ 0.267V＋0.89 • VCCの場合、入力電圧範囲は−0.3V～1.125 • VreFである。0.267V＋0.89 • VCC < VreF ≤ VCCの 場合、入力電圧範囲は−0.3V～VCC＋0.3Vである。 Note 15 VCC （dC）= 4.1V, VCC（aC）= 2.8Vp-p。 LTC2420 標準的性能特性 3V 10 VCC = 3V VREF = 2.5V 8 3V 10 VCC = 3V VREF = 2.5V 8 6 4 4 4 0 –2 –4 2 0 –2 –4 TA = –55°C, –45°C, 25°C, 90°C –6 ERROR (ppm) 6 2 –8 –10 2.5 0.5 0 1.5 2.0 1.0 INPUT VOLTAGE (V) 4 2.55 2.60 2.65 2.70 INPUT VOLTAGE (V) 2.75 2.80 –8 –10 1 0 3 2 INPUT VOLTAGE (V) 6 4 TA = 25°C TA = 90°C TA = –45°C 8 0 1 3 2 INPUT VOLTAGE (V) 4 5 2420 G06 150 VCC = 5V VREF = 5V 0 –2 4 2 0 –2 –4 –4 –6 –6 –8 –8 –0.05 –0.10 –0.15 –0.20 –0.25 –0.30 INPUT VOLTAGE (V) 2420 G07 –10 5.00 VCC = 5V TA = 25°C 120 6 TA = –55°C 0 5 5V 10 2 –10 4 2420 G05 ERROR (ppm) VCC = 5V VREF = 5V TA = –55°C, –45°C, 25°C, 90°C –6 –8 5V 8 –2 –10 2420 G04 10 2 0 –4 TA = –55°C, –45°C, 25°C, 90°C –6 –8 –10 2.50 –2 –4 TA = –55°C, –45°C, 25°C, 90°C –6 2 0 TA = –55°C TA = 90°C 5.05 TA = 25°C 5.10 5.15 5.20 INPUT VOLTAGE (V) OFFSET ERROR (ppm) –4 ERROR (ppm) 6 4 ERROR (ppm) ERROR (ppm) 6 4 –2 VCC = 5V VREF = 5V 8 6 0 –0.05 –0.10 –0.15 –0.20 –0.25 –0.30 INPUT VOLTAGE (V) INL 5V 10 VCC = 5V VREF = 5V 8 2 0 2420 G03 5V 10 VCC = 3V VREF = 2.5V 8 2.5 2420 G02 3V 10 TA = –55°C –6 –8 2420 G01 ERROR (ppm) 0 –10 1.5 2.0 1.0 INPUT VOLTAGE (V) TA = –45°C –2 –8 0.5 TA = 25°C 2 –10 0 TA = 90°C –4 TA = –55°C, –45°C, 25°C, 90°C –6 VCC = 3V VREF = 2.5V 8 6 ERROR (ppm) ERROR (ppm) INL 3V 10 90 60 30 TA = –45°C 5.25 5.30 2420 G08 0 0 1 3 4 2 REFERENCE VOLTAGE (V) 5 2420 G09 5 LTC2420 標準的性能特性 RMS VCC VCC = 5V TA = 25°C OFFSET ERROR (ppm) 50 RMS NOISE (ppm OF VREF) 10 40 30 20 RMS 10.0 VREF = 2.5V TA = 25°C 5 VCC VREF = 2.5V TA = 25°C 7.5 RMS NOISE (ppm) 60 0 –5 5.0 2.5 10 0 0 1 –10 5 2 3 4 REFERENCE VOLTAGE (V) 2.7 3.2 3.7 4.2 VCC (V) 0 5.2 5.5 4.7 2420 G10 2.7 3.2 3.7 4.2 VCC (V) 4.7 2420 G11 5.2 5.5 2420 G12 RMS 5.00 200 150 100 10 VCC = 5V VREF = 5V VIN = 0.3V TO 5.3V TA = 25°C 3.75 250 RMS NOISE (ppm) NUMBER OF READINGS VCC = 5 =5 V 300 REF VIN = 0 OFFSET ERROR (ppm) 350 2.50 1.25 VCC = 5V VREF = 5V VIN = 0V 5 0 –5 50 0 –2 4 2 0 OUTPUT CODE (ppm) 0 6 0 7FFFFF CODE OUT (HEX) –10 –55 –30 FFFFFF 2420G13 70 –5 20 45 TEMPERATURE (°C) 95 120 2420 G15 2420 G14 VCC 0 VCC = 5V VREF = 5V VIN = 5V 10 5 0 –5 FULL-SCALE ERROR (ppm) –25 FULL-SCALE ERROR (ppm) FULL-SCALE ERROR (ppm) 10 –50 –75 –100 –125 –10 –55 –30 70 –5 20 45 TEMPERATURE (°C) 95 120 2420 G16 6 –150 VCC = 5V VIN = VREF 0 1 2 3 4 REFERENCE VOLTAGE (V) 5 2420 G17 VREF = 2.5V VIN = 2.5V TA = 25°C 5 0 –5 –10 2.7 3.2 3.7 4.2 VCC (V) 4.7 5.2 5.5 2420 G18 LTC2420 標準的性能特性 VCC 30 230 VCC = 4.1V VIN = 0V T = 25°C –40 F A = 0 O VCC = 5.5V 200 VCC = 4.1V 190 180 VCC = 2.7V 170 VCC = 2.7V 20 REJECTION (dB) 210 SUPPLY CURRENT (μA) SUPPLY CURRENT (μA) 220 –20 VCC = 5V 10 –60 –80 –100 160 150 – 55 –30 –5 45 70 20 TEMPERATURE (°C) 95 0 –55 –30 120 70 –5 20 45 TEMPERATURE (°C) 2420 G19 VCC 1 50 VCC –20 –40 –40 –40 REJECTION (dB) VCC = 4.1V VIN = 0V –20 TA = 25°C FO = 0 –80 –60 –80 –100 –100 –120 15200 15250 15300 15350 15400 15450 15500 FREQUENCY AT VCC (Hz) –120 VCC = 5V VREF = 5V VIN = 2.5V FO = 0 –60 –80 –100 1 100 10k FREQUENCY AT VCC (Hz) 2420 G22 –120 1M 1 VIN 0 –20 REJECTION (dB) –80 –110 0 VCC = 5V VREF = 5V VIN = 2.5V FO = 0 –20 –40 –40 –60 –80 –60 –80 –100 –120 –100 –130 250 VIN REJECTION (dB) –70 –100 100 150 200 FREQUENCY AT VIN (Hz) 2420 G24 VIN –90 50 2420 G23 –60 250 VIN 0 VCC = 4.1V VIN = 0V –20 TA = 25°C FO = 0 –60 150 200 100 FREQUENCY AT VCC (Hz) 2420 G21 0 REJECTION (dB) REJECTION (dB) –120 120 2420 G20 0 REJECTION (dB) 95 –120 SAMPLE RATE = 15.36kHz 2% –140 –120 15100 –12 –8 –4 0 4 8 12 INPUT FREQUENCY DEVIATION FROM NOTCH FREQUENCY (%) 2420 G25 15200 15300 15400 FREQUENCY AT VIN (Hz) 15500 –140 0 fS/2 fS INPUT FREQUENCY 2420 G26 2420 F27 7 LTC2420 標準的性能特性 VCC = 5V VREF = 5V FO = EXTERNAL 18 16 TUE RESOLUTION (BITS) TUE RESOLUTION (BITS) INL 20 TA = –45°C TA = 25°C 14 TA = 90°C 12 10 24 VCC = 3V VREF = 2.5V FO = EXTERNAL 18 16 TA = –45°C 14 TA = 25°C TA = 90°C 12 0 10 10 20 30 40 50 60 70 80 90 100 OUTPUT RATE (Hz) VCC = 5V VREF = 5V fO = EXTERNAL TA = 25°C TA = 90°C TA = –45°C 22 RESOLUTION (BITS) INL 20 0 10 20 30 40 50 60 70 80 90 100 OUTPUT RATE (Hz) 2420 G28 20 18 16 25 0 7.5 75 50 OUTPUT RATE (Hz) 2420 G29 100 2420 G30 ピン機能 VCC 10μF 1 0.1μF GND SDO 6 CS VREF V H CS = V CC SDO 0.1V 2 CS L CC VIN 3 4 0.125 • VREF 3 1.125 • VREF 0.3VV GND SCK 7 SCK VREF > 2.5V CC 0.3V SCK 4 SCK CS CS L 5 L SDO FO ADC 50Hz H CS H L ADC L FO FO 60Hz L GND F O = OV SDO CS H fEOSC/2560 8 V CC = VCC ADC CS ADC FO 8 FO fEOSC LTC2420 機能ブロック図 VCC GND FO (INT/EXT) VIN SDO Σ ADC SCK CS VREF FIR DAC 2420 FD テスト回路 VCC 3.4k SDO SDO 3.4k Hi-Z TO VOH VOL TO VOH VOH TO Hi-Z CLOAD = 20pF 2420 TC01 CLOAD = 20pF Hi-Z TO VOL VOH TO VOL VOL TO Hi-Z 2420 TC02 9 LTC2420 アプリケーション情報 LTC2420 LTC2400 2 LTC2420 LTC2400 32 24 LTC2400 1 SCK 24 LTC2420 L CS SCK SDO SCK SCK LTC2400 8 LTC2420 H 4 24 ADC CS H 8 CS LTC2420 SCK LTC2420 SCK 3 SCK 3 2 3 SDO SCK CS CONVERT LTC2420 1 CS H SLEEP 1 CS AND SCK 0 DATA OUTPUT 2420 F02 2. LTC2420 CS 8 8 8 8 (OPTIONAL) SCK SDO EOC = 1 EOC = 0 DATA OUT 4 STATUS BITS 20 DATA BITS CONVERSION SLEEP DATA OUTPUT EOC = 1 LAST 8 BITS ALWAYS 1 CONVERSION 2420 F01 1. LTC2400 10 LTC2420 LTC2420 アプリケーション情報 V CC Sinc Comb 50Hz 0.5ms POR LTC2420 POR POR 60Hz POR 110dB LTC2420 LTC2420 50 60Hz2% 1 0V VCC 10dB LTC2420 1 INL 1 LTC2420 100mVV CC LTC2420 1 3 VREF VCC 2.2V LTC2420 2I/O V REF 0.3V LTC2420 0.125V • VREF 1.125 • VCC 0.3V ESD VCC + 0.3V 9/8VREF VREF 1/2VREF NORMAL INPUT RANGE EXTENDED INPUT RANGE ABSOLUTE MAXIMUM INPUT RANGE 0 –1/8VREF –0.3V 2420 F03 3. LTC2420 11 LTC2420 アプリケーション情報 VIN 300mV VCC 20 4 EXR 300mV VIN 0 ≤ V IN ≤ VREF L VIN > VREF H 25k VIN < 0 V IN 1 VIN 1. LTC2420 23 22 DMY EOC V REF = 5V 1ppm 1nA 5kΩ 21 0 0 1 1 0 < Vin ≤ VreF 0 0 1 0 Vin = 0 /0 0 0 1/0 0 Vin < 0 0 0 0 1 ＋ − 24 190 20 MSB 23 MSB MSB 0 LSB SCK 4 L SDO H 22 2 CS L L CS EOC SDO H L 21 3 H H SCK DMY VIN > 0 SDO SDO L SIG 20 EOC CS EXR Vin > VreF 195 LTC2420 4 VIN < 0 L CS BIT 23 BIT 22 BIT 21 BIT 20 BIT 19 EOC “0” SIG EXT MSB BIT 4 1 2 3 4 SLEEP BIT 0 LSB20 Hi-Z SCK 5 DATA OUTPUT 19 20 24 CONVERSION 2420 F04 4. 12 CS EOC 23 EOC 22 SCK SCK L SDO 20 SIG LTC2420 アプリケーション情報 0 23 24 24 SDO SCK SCK 50Hz 60Hz 50Hz 60Hz FO SCK H EOC 23 2 VIN 0.3V VCC 0.3V 0.125 • VREF 1.125 • LTC2420 VREF 1.125 • V REF VREF VREF 1.125 • 0.125 • FO fEOSC 2560Hz 0.125 • VREF H tHEO L 1Hz tLEO FO LTC2420 GND 1 4 50Hz 2% 60Hz 2% 110dB 60Hz FO 8 50Hz FO VCC LTC2420 fEOSC fEOSC/2560 4% 110dB f EOSC/2560 5 2. LTC2420 Input Voltage Bit 23 Bit 22 Bit 21 Bit 20 Bit 19 Bit 18 Bit 17 Bit 16 Bit 15 … Bit 0 EOC DMY SIG EXR MSB LSB VIN > 9/8 • VREF 0 0 1100 0 11...1 9/8 • VREF 0 0 1100 0 11...1 VREF + 1LSB 0 0 1100 0 00...0 VREF 0 0 1011 1 11...1 3/4VREF + 1LSB 0 0 1011 0 00...0 3/4VREF 0 0 1010 1 11...1 1/2VREF + 1LSB 0 0 1010 0 00...0 1/2VREF 0 0 1001 1 11...1 1/4VREF + 1LSB 0 0 1001 0 00...0 1/4VREF + – 0 0 1000 1 11...1 0 /0 0 01/0* 000 0 00...0 –1LSB 0 0 0111 1 11...1 –1/8 • VREF 0 0 0111 1 00...0 VIN < –1/8 • VREF 0 0 0111 1 00...0 * 符号ビットはコード0の間に状態を変える。 13 LTC2420 アプリケーション情報 –60 3 FO –70 REJECTION (dB) –80 LTC2420 –90 3 –100 –110 –120 –130 –140 –12 –8 –4 0 4 8 12 INPUT FREQUENCY DEVIATION FROM NOTCH FREQUENCY (%) / SCK SCK 7 SDO 2420 F05 5. LTC2420 fEOSC SCK SCK LTC2420 8 FO SCK CS LTC2420 LTC2420 SCK SCK H L H SCK SCK SCK L SCK SCK 3. LTC2420 State Operating Mode Duration CONVERTInternal Oscillator FO = LOW (60Hz Rejection) 133ms FO = HIGH (50Hz Rejection) 160ms External Oscillator FO = External Oscillator with Frequency fEOSC kHz (fEOSC/2560 Rejection) 20510/fEOSCs SLEEPAs Long As CS = HIGH Until CS = 0 and SCK DATA OUTPUTInternal Serial Clock FO = LOW/HIGHAs Long As CS = LOW But Not Longer Than 1.26ms (Internal Oscillator) (24 SCK cycles) FO = External Oscillator with As Long As CS = LOW But Not Longer Than 256/fEOSCms Frequency fEOSC kHz (24 SCK cycles) External Serial Clock with As Long As CS = LOW But Not Longer Than 24/fSCKms Frequency fSCK kHz (24 SCK cycles) 14 LTC2420 アプリケーション情報 SDO SDO 6 LTC2420 3 SPI M ICROWIRE SDO / 2 SDO CS 5 3 H FO = L CS L CS L CS = 0 I/O SDO EOC SDO EOC EOC L FO = H FO 4 H SCK SPI/MICROWIRE CS CS 6 L CS 5 CS CS SCK LTC2420 CS = L CS SCK L SDO CS CS L H H CS L EOC = 1 CS L CS SDO EOC EOC = 0 CS CS ADC 13 FO CS 15 EOC = 0 CS L SCK 4. LTC2420 Conversion DataConnection SCK CycleOutput and Configuration Source Control ControlWaveforms External SCK, Single Cycle ConversionExternal CS and SCK CS and SCK Figures 6, 7 External SCK, 2-Wire I/OExternal SCK SCK Figure 8 CS ↓ CS ↓ Figures 9, 10 Internal SCK, Single Cycle ConversionInternal Internal SCK, 2-Wire I/O, Continuous ConversionInternal ContinuousInternal Figure 11 Internal SCK, Autostart ConversionInternal CEXTInternal Figure 12 15 LTC2420 アプリケーション情報 2.7V TO 5.5V VCC 1μF VCC = 50Hz REJECTION = EXTERNAL OSCILLATOR = 60Hz REJECTION FO LTC2420 VREF 0.1V TO VCC VIN –0.12VREF TO 1.12VREF VREF SCK VIN SDO GND CS CS TEST EOC TEST EOC BIT 23 SDO BIT 22 EOC Hi-Z BIT 21 BIT 20 BIT 19 SIG EXR MSB BIT 18 BIT 4 BIT 0 LSB20 Hi-Z TEST EOC Hi-Z SCK (EXTERNAL) CONVERSION SLEEP DATA OUTPUT CONVERSION 2420 F06 6. SCK 2 SDO SCK EOC SCK I/O 2 SCK 24 SCK 24 SDO H EOC SCK CS I/O 8 4 =1 POR VCC 2.2V SCK POR CS L EOC 0.5ms CS H SCK SDO POR CS L SCK CS CS SCK L L EOC 24 CS 7 L SDO EOC H EOC = 1 EOC = 0 CS EOC 24 SCK SCK 16 SDO LTC2420 アプリケーション情報 2.7V TO 5.5V VCC 1μF VCC = 50Hz REJECTION = EXTERNAL OSCILLATOR = 60Hz REJECTION FO LTC2420 VREF 0.1V TO VCC VIN –0.12VREF TO 1.12VREF VREF SCK VIN SDO GND CS BIT 22 BIT 21 BIT 20 BIT 19 SIG EXR MSB CS TEST EOC BIT 0 SDO TEST EOC BIT 23 EOC EOC Hi-Z Hi-Z BIT 9 TEST EOC BIT 8 Hi-Z Hi-Z SCK (EXTERNAL) SLEEP CONVERSION SLEEP DATA OUTPUT CONVERSION 2420 F07 DATA OUTPUT 7. 2.7V TO 5.5V VCC 1μF VCC = 50Hz REJECTION = EXTERNAL OSCILLATOR = 60Hz REJECTION FO LTC2420 VREF 0.1V TO VCC VIN –0.12VREF TO 1.12VREF VREF SCK VIN SDO GND CS CS BIT 23 SDO BIT 22 EOC BIT 21 BIT 20 BIT 19 SIG EXR MSB BIT 18 BIT 4 BIT 0 LSB20 SCK (EXTERNAL) CONVERSION SLEEP DATA OUTPUT CONVERSION 2420 F07 8. CS = 0 17 LTC2420 アプリケーション情報 SCK EOC SCK SCK 24 EOC = 1 H EOC = 0 EOC CS L L CS L SDO SCK CS H SCK tEOCtest tEOCtest CS SCK CS EOC H EOC = 0 EOC 9 FO = 23μs SCK CS H SCK HI-Z CS CS CS L f FO EOSC tEOCtest 3.6/fEOSC H H tEOCtest tEOCtest L SCK SCK CS tEOCtest L SCK SDO SCK 24 SDO CS H SCK CS CS L EOC = 1 SDO L L SCK SCK EOC SDO EOC SCK EOC = 0 SCK VCC 2.7V TO 5.5V VCC 1μF VCC = 50Hz REJECTION = EXTERNAL OSCILLATOR = 60Hz REJECTION FO 10k LTC2420 VREF 0.1V TO VCC VIN –0.12VREF TO 1.12VREF VREF SCK VIN SDO GND CS <tEOCtest CS TEST EOC SDO BIT 23 BIT 22 EOC Hi-Z BIT 21 BIT 20 BIT 19 SIG EXR MSB BIT 18 BIT 4 BIT 0 LSB20 Hi-Z TEST EOC Hi-Z Hi-Z SCK (INTERNAL) CONVERSION SLEEP DATA OUTPUT CONVERSION 2420 F09 9. 18 LTC2420 アプリケーション情報 24 24 SDO H EOC = 1 SCK SCK L LTC2420 SCK H SCK SCK SCK CS SCK L L 24 CS 10 LTC2420 H SCK CS L SCK CS SCK 10k 24 CS SCK SCK H H SCK L CS H CS CS H - L - H SCK SCK 10k L EOC = 0 SCK CS L H H CS tEOCtest SCK H CS L EOC = 0 SCK CS L 10k SCK VCC 2.7V TO 5.5V VCC 1μF VCC = 50Hz REJECTION = EXTERNAL OSCILLATOR = 60Hz REJECTION FO 10k LTC2420 VREF 0.1V TO VCC VIN –0.12VREF TO 1.12VREF VREF SCK VIN SDO GND > tEOCtest CS <tEOCtest CS TEST EOC BIT 0 SDO TEST EOC EOC Hi-Z BIT 23 EOC Hi-Z Hi-Z BIT 22 BIT 21 BIT 20 BIT 19 SIG EXR MSB Hi-Z BIT 18 BIT 8 TEST EOC Hi-Z SCK (INTERNAL) SLEEP CONVERSION SLEEP DATA OUTPUT CONVERSION 2420 F10 DATA OUTPUT 10. 19 LTC2420 アプリケーション情報 2 SCK I/O 2 SCK 24 SDO SCK 11 SCK CS SDO 4 SCK EOC SCK POR VCC 2.2V POR POR 0.5ms SCK 24 24 SDO H EOC = 1 SCK H SCK L SCK SCK H 2 SCK SCK EOC = 1 EOC = 0 SDO SDO SCK H L I/O CS 1 CS CS H 25nA SCK CS 12 2.7V TO 5.5V VCC 1μF VCC FO = 50Hz REJECTION = EXTERNAL OSCILLATOR = 60Hz REJECTION LTC2420 VREF 0.1V TO VCC VIN –0.12VREF TO 1.12VREF VREF SCK VIN SDO GND CS CS BIT 23 SDO BIT 22 EOC BIT 21 BIT 20 BIT 19 SIG EXR MSB BIT 18 BIT 4 BIT 0 LSB20 SCK (INTERNAL) CONVERSION DATA OUTPUT 11. 20 CONVERSION 2420 F11 SLEEP LTC2420 アプリケーション情報 13 14 CS 1.4V PCB SCK CS 24 SCK 7 SDO 6 SCK 24 tSAMPLE (SEC) CS 5 H 15 CS 4 3 2 VCC = 5V 1 0 VCC = 3V 10 100 1000 10000 CAPACITANCE ON CS (pF) 1 CS 100000 2420 F13 13. CS tSAMPLE 2.7V TO 5.5V VCC 1μF VCC = 50Hz REJECTION = EXTERNAL OSCILLATOR = 60Hz REJECTION FO LTC2420 VREF 0.1V TO VCC VIN –0.12VREF TO 1.12VREF VREF SCK VIN SDO GND CS CEXT VCC CS GND BIT 23 SDO EOC Hi-Z BIT 22 BIT 21 SIG BIT 0 Hi-Z SCK (INTERNAL) CONVERSION SLEEP DATA OUTPUT CONVERSION 2420 F12 12. 21 LTC2420 アプリケーション情報 SCK 8 7 6 SAMPLE RATE (Hz) SDO SCK VCC = 5V 5 LTC2420 VCC = 3V 4 3 GND 2 1 0 0.01Ω 10 100 10000 100000 1000 CAPACITANCE ON CS (pF) 0 2420 F14 LTC2420 VREF = 2.5V 1ppm 14. CS GND 300 250 SUPPLY CURRENT (μARMS) 2.5μV VCC = 5V 200 GND VCC = 3V 150 100 50 0 1 10 100000 100 1000 10000 CAPACITANCE ON CS (pF) 0.5V V CC 0.5V CMOS 2420 F15 SCK 15. CS F O CS SCK LTC2420 CS CS SCK SCK CMOS [VIL < 0.4V CS SCK L LTC2420 F O CS SCK LTC2420 SCK TTL/CMOS 2 100μs 22 VOH > VCC 0.4V ] FR-4 LTC2420 アプリケーション情報 183ps/ 170ps/ 1ppm 6.5μs/14 = 460ns 1ns VREF VIN 2.5 VIN / LTC2420 27Ω 17 2 56Ω LTC2420 C VIN < 0.01μF IN VIN CIN > 0.01μF 0.01μF 18 / 20pF 19 20 < 0.01μF 80k Ω CIN VIN 4 VREF VIN VREF 16 1 RC LTC2420 6.5μs 153,600Hz 1ppm TUE 14 VCC IREF(LEAK) VREF RSW 5k 0 IREF(LEAK) IIN VIN VCC IIN(LEAK) RSW 5k AVERAGE INPUT CURRENT: IIN = 0.25(VIN – 0.5 • VREF)fCEQ CEQ 1pF (TYP) IIN(LEAK) GND RSW 5k 2420 F16 SWITCHING FREQUENCY f = 153.6kHz FOR INTERNAL OSCILLATOR (fO = LOGIC LOW OR HIGH) f = fEOSC FOR EXTERNAL OSCILLATORS 16. LTC2420 17. VREF/2 VREF VIN 2420 F17 / RSOURCE INTPUT SIGNAL SOURCE VIN CIN CPAR ≅ 20pF LTC2420 2420 F18 18. VIN RC 23 LTC2420 アプリケーション情報 50 30 CIN = 0pF CIN = 100pF CIN = 1000pF 20 CIN = 0.01μF 10 0 CIN = 22μF CIN = 10μF CIN = 1μF CIN = 0.1μF CIN = 0.01μF CIN = 0.001μF 30 OFFSET ERROR (ppm) 40 OFFSET ERROR (ppm) 35 VCC = 5V VREF = 5V VIN = 0V TA = 25°C 25 20 VCC = 5V VREF = 5V 15 VIN = 0V TA = 25°C 10 5 10 1 1k 100 RSOURCE (Ω) 10k 0 100k 200 0 400 600 RSOURCE (Ω) 2420 F21 2420 F19 19. RSOURCE C 21. 10 C 0 FULL-SCALE ERROR (ppm) FULL-SCALE ERROR (ppm) RSOURCE 5 0 –10 CIN = 0pF CIN = 100pF CIN = 1000pF –20 –30 CIN = 0.01μF VCC = 5V VREF = 5V VIN = 5V TA = 25°C –40 –50 1000 800 1 VCC = 5V VREF = 5V VIN = 0V TA = 25°C –5 –10 –15 –20 CIN = 22μF CIN = 10μF CIN = 1μF CIN = 0.1μF CIN = 0.01μF CIN = 0.001μF –25 –30 10 100 1k RSOURCE (Ω) –35 100k 10k 0 200 400 600 RSOURCE (Ω) 800 2420 F20 20. RSOURCE 1000 2420 F22 C 22. CIN > 0.01μF RSOURCE C VREF DC 21 22 V IN 16.6MΩ VIN = 0V 150nA VREF = 5V VIN = VREF VIN = VREF CVREF > 0.01μF VREF 10Ω 0.3ppm VREF 80k 24 ESD 1nA 10nA 24 10kΩ 10μV 0.03ppm/Ω CVREF < 0.01μF VREF 20pF 23 LTC2420 アプリケーション情報 60 40 VCC = 5V = 5V V 40 T REF A = 25°C INL ERROR (ppm) 50 FULL-SCALE ERROR (ppm) 50 CVREF = 22μF CVREF = 10μF CVREF = 1μF CVREF = 0.1μF CVREF = 0.01μF CVREF = 0.001μF 30 VCC = 5V VREF = 5V 20 VIN = 5V TA = 25°C 10 0 –10 30 CVREF = 1000pF 20 CVREF = 100pF 10 CVREF = 0.01μF 0 –10 200 400 –20 1000 600 800 RESISTANCE AT VREF (Ω) 0 CVREF = 0pF 1 10 100 1k 10k RESISTANCE AT VREF (Ω) 2420 F23 23. RVREF 2420 F25 C 25. INL 10 500 6 CVREF = 1000pF CVREF = 100pF 200 CVREF = 0.01μF 100 0 CVREF = 0pF C 4 2 VCC = 5V VREF = 5V TA = 25°C 0 –2 –4 –6 –100 –200 RVREF CVREF = 22μF CVREF = 10μF CVREF = 1μF CVREF = 0.1μF CVREF = 0.01μF CVREF = 0.001μF 8 INL ERROR (ppm) VOLTAGE VCC = 5V = 5V V 400 VREF= 5V IN TA = 25°C 300 –8 10 1 100 1k 10k RESISTANCE AT VREF (Ω) –10 100k 0 200 400 600 800 RESISTANCE AT VREF (Ω) 24. RVREF C 26. INL RC ADC VREF C ADC INL 25 VREF 1 LTC2420 26 fS V REF ESD 50Hz 1nA RVREF CVREF < 0.01μF CVREF > 0.01μF 0.015ppm/Ω 1000 2420 F26 2420 F24 10μV 100k 10nA 256 • FO 60Hz 27 FO 10k 0.2% 25 LTC2420 アプリケーション情報 0 800Hz NOTCH (100 SAMPLES/SECOND) –20 60Hz NOTCH (7.5 SAMPLES/SECOND) REJECTION (dB) –40 1 2 –60 3 –80 4 LTC2420 8 FO VCC VREF SCK VIN SDO 7 6 5 CS GND –100 EXTERNAL 2.048MHz CLOCK SOURCE INTERNAL 153.6kHz OSCILLATOR 2420 F28 –120 –140 28. fS/2 0 100 / fS INPUT FREQUENCY 256 2420 F27 TOTAL UNADJUSTED ERROR (ppm) 27. Sinc4 256 LTC2420 RC LTC2420 RC VREF = 5V 12 BITS 224 192 160 13 BITS 128 96 14 BITS 64 32 0 16 BITS 0 50 100 150 OUTPUT RATE (SAMPLES/SEC) LTC2420 2420 F29 V REF 40% ESD 300mV 29. 300mV V CC 29 5V INL DNL ODR F LTC2420 60Hz 153.6kHz 7.5 L 50Hz FO 50 FO 100 / O / TUE FO 2.048MHz 800Hz 28 FO Odr = FO/20480 / H 16 100 100 31 30 VREF 2.5V LTC2420 100 32 5V / / / 12 TUE 15 / VREF = 2.5V 7.5 26 VREF = 5V LTC2420 アプリケーション情報 TOTAL UNADJUSTED ERROR (ppm) 256 12 BITS OUTPUT RATE = 100sps 224 192 160 13 BITS 128 96 14 BITS 64 15 BITS 32 0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 REFERENCE VOLTAGE (V) 5.0 4.5 2420 F30 30. = 100sps 6 VCC = 5V VREF = 2.5V 5 TOTAL UNADJUSTED ERROR (ppm) TOTAL UNADJUSTED ERROR (ppm) 10 VREF 0 –5 –10 –15 –20 –25 –30 –35 –40 2 0 –2 –4 –6 –8 –10 2.5 0 VCC = 5V VREF = 5V 4 5 0 INPUT VOLTAGE (V) INPUT VOLTAGE (V) 2420 F31 31. 100 100 / 100 33 LTC2420 100 / FO 60Hz LTC2420 32. 7.5 / LTC2420 2Hz / LTC2420 / 110dB 2420 F32 L DC 90dB LTC2420 DC 15Hz 2V DC 34a 34b 34d 300mVP-P DC DC 34c 2 100 / 7.5 / 27 LTC2420 アプリケーション情報 0 fIN = 2Hz 500ms 0.15 2Hz 100sps 0V OFFSET –20 0.10 MAGNITUDE (dB) ADC OUTPUT (NORMALIZED TO VOLTS) 0.20 0.05 0 –0.05 –40 –60 –80 –0.10 –100 –0.15 –0.20 –120 TIME FREQUENCY (Hz) 2420 F33a 2420 F33b 33a. 33b. FFT 33. 0 VIN = 300mVP-P + 2V DC 2.15 15Hz 100sps 2V OFFSET –20 2.10 MAGNITUDE (dB) ADC OUTPUT (NORMALIZED TO VOLTS) 2.20 2.05 2.00 1.95 –40 –60 –80 1.90 –100 1.85 1.80 –120 TIME FREQUENCY (Hz) 2420 F34a 34a. DC 2V 34b. DC 2V FFT 0 VIN = 300mVP-P + 0V DC 0.15 15Hz 100sps 0V OFFSET –20 0.10 MAGNITUDE (dB) ADC OUTPUT (NORMALIZED TO VOLTS) 0.20 2420 F34b 0.05 0.00 –0.05 –40 –60 –80 –0.10 –100 –0.15 –0.20 –120 TIME FREQUENCY (Hz) 2420 F34c 34c. 34d. 34. LTC2420 DC 28 2420 F34d 300mVP-P 15Hz VCC = 5V VREF = 5V FFT LTC2420 標準的応用例 LTC2420 LTC2420 LTC2420 ADC 2 1 10ppm LTC2420 4 36 LTC2420 4 CS 7.5Hz LTC2420 1 35 400Hz LTC2420 CS LTC2420 30Hz SCK SDO 4 4 CS CS ADC LTC2420 LTC2420 1 60Hz 24 23 SCK 7.5Hz SCK LTC2420 24 CS 23 SCK ADC 4 2 LTC2420 CS 7 LTC2420 F O LTC2420 SCK2 SCK1 LTC2420 #1 VCC μCONTROLLER EXTERNAL OSCILLATOR (153,600HZ) LTC2420 #2 FO FO VCC VREF SCK VREF SCK VIN SDO VIN SDO GND CS GND CS CS SDO1 SDO2 VREF (0.1V TO VCC) CS SCK1 23 OR LESS CLOCK CYCLES SCK2 23 OR LESS CLOCK CYCLES SDO1 SDO2 2420 F35 35. 29 LTC2420 標準的応用例 LTC2420 #2 LTC2420 #1 VCC μCONTROLLER FO VCC LTC2420 #3 FO VCC VREF (0.1V TO VCC) EXTERNAL OSCILLATOR (153,600HZ) LTC2420 #4 FO VCC FO VREF SCK VREF SCK VREF SCK VREF SCK VIN SDO VIN SDO VIN SDO VIN SDO GND CS GND CS GND CS GND CS SCK SDO CS1 CS2 CS3 CS4 CS1 CS2 CS3 CS4 SCK 23 OR LESS CLOCK PULSES SDO 2420 F36 36. 30 4 LTC2420 LTC2420 標準的応用例 0.5 LTC2420 5V 15V R2 2 LTC2420 300mV 37 ® LT 1920 LTC2420 0.0008% 5 C1 LTC2420 300mV VCC 17 LTC1920 LT1920 LTC2420 5 LT1167 100 V OST 63μV 0.3% LT1167 5100 LTC2420 RC 100 135μV LT1920 LT1167 10 100 15ppm 6 LT1167 VOST LT1920 30ppm 0.1% 37 30% 5V 0.1μF VREFIN 2 DIFFERENTIAL INPUT RG** 1 8 3 VS+ 0.1μF VIN+ RG 1 7 LT1920 RG VIN– 4 R1* 47Ω 6 R2* 10k 0.1μF C1* 1μF VS – 2 3 VCC VREF LTC2420 VIN GND 4 † † CS FO SDO SCK 5 6 7 CHIP SELECT SERIAL DATA OUT SERIAL CLOCK 2420 F37 8 † SINGLE POINT “STAR” GROUND *OPTIONAL—SEE TEXT **RG = 49.4k/(AV – 1): USE 5.49k FOR AV = 10; 499 FOR AV = 100 † USE SHORT LEAD LENGTHS 37. LT1920 LTC2420 31 LTC2420 標準的応用例 5. 34 LT1920 LTC2420 ADC VS = ±5V VS = ±15V PARAMETERAV = 10 AV = 100 AV = 10 AV = 100 TOTAL (UNITS) Differential Input Voltage Range – 3 to 40 –30 to 500 –3 to 50 mV Zero Error – 30 to 400 –160 – 2650 Maximum Input Current –213 –2625 2.0 µV nA Nonlinearity ±8.2 ±7.4 ±6.5±6.1 Noise (Without Averaging) 1.8* 0.25* 1.5* 0.27* µVRMS Noise (Averaged 64 Readings) 0.2* 0.03* 0.19* 0.03* µVRMS 21 20.6 21.3 20.5Bits 17.2 17.3 17.5 18.2Bits Resolution (with Averaged Readings) Overall Accuracy (Uncalibrated) Common Mode Rejection Ratio Common Mode Range 2/–1.5** ≥120 2.2/–1.7** 11.5/–11** 11.7/–11.2** ppm dB V * 対応する利得の入力換算ノイズ。 ** 各アンプについて研究室試験を1回行ったテスト・サンプルに基づく標準値。 6. 34 LT1167 LTC2420 ADC VS = ±5V VS = ±15V PARAMETERAV = 10 AV = 100 AV = 10 AV = 100 TOTAL (UNITS) Differential Input Voltage Range – 3 to 40 –30 to 500 –3 to 50 mV –1470 µV Zero Error – 30 to 400 –94 – 1590 Maximum Input Current Nonlinearity –110 0.5 ±4.1 ±4.4 ±4.1±3.7 nA ppm Noise (Without Averaging) 1.4* 0.19* 1.5* 0.18* µVRMS Noise (Averaged 64 Readings) 0.18* 0.02* 0.19* 0.02* µVRMS Resolution (with Averaged Readings) 21.4 21.0 21.3 21.1Bits Overall Accuracy (Uncalibrated) 18.2 18.1 18.2 19.4Bits Common Mode Rejection Ratio Common Mode Range 2/–1.5** ≥120 2.2/–1.7** 11.5/–11** * 対応する利得の入力換算ノイズ。 ** 各アンプについて研究室試験を1回行ったテスト・サンプルに基づく標準値。 32 11.7/–11.2** dB V LTC2420 標準的応用例 38 2.5V LT1461-2.5 3ppm/ C 45μA LT1461 ADC LTC2420 100 1k 60% LT1167 50nV RMS LTC2420 100 0.1Hz 1/f LTC2420 LTC2420 LT1167 RFI LT1167 200 LT1167 39 LTC2420 IN 5V TO LTC2420 REF 1k OUT + 0.1μF LT1461-2.5 CER 10μF 16V TANT GND 2420 F38 38. 5V 3.5k ×4 RG 5V 2 1 8 3 10μF + + 1 2 OPTIONAL 6 LT1167 5 – 5k 22Ω 1μF 3 LTC2420 4 –5V AV = 49.4kΩ + 1 RG RECOMMENDED RG: 500Ω, 0.1% 5ppm/°C 2428 F39 39. 33 LTC2420 標準的応用例 100sps 50Hz 40 LTC2420 2.048MHz 60Hz 1 FO 3 1k 1k 10k 47k 2N3904 5k 12 U1-F 13 47k 5pF 270pF 1 U1-A 10pF 100smps, FO = 2.048MHz 30smps, FO = 614.4kHz U1: 74HC14 OR EQUIVALENT 40. 100sps 34 1 74HC14 2 3 U1-B 4 5 11 9 U1-C U1-E U1-D 6 10 8 TO LTC2420 FO PIN 2420 F40 2.048MHz HALT LTC2420 パッケージ mm S8 8 0.150 （LtC dWg # 05-08-1610） 0.189 – 0.197* (4.801 – 5.004) 8 7 6 5 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0°– 8° TYP 0.016 – 0.050 (0.406 – 1.270) * ** 0.053 – 0.069 (1.346 – 1.752) 0.014 – 0.019 (0.355 – 0.483) TYP 2 3 4 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC 0.006"0.152mm 0.010"0.254mm SO8 1298 35 LTC2420 標準的応用例 41 6 LTC1391 81 7 ( ) LTC1391 THERMOCOUPLE CH0 VCC CH1 LTC1391 CH2 CH3 OUT THERMISTOR VREF VCC FO LTC2420 VIN SCK SDO CH4 CH5 CH6 CH7 GND CS 2420 F41 GND 41. 関連製品 LT1019 2.5V 5V 3ppm/ LT1025 0.5 0.05% 80 μA LTC1043 LTC1050 5μV LT1236A-5 LTC1391 5V 0.05% R ON 45Ω 8 LT1460 LTC2400 0.075% 10V SO-8 24 24 No Latency ADC 24 LTC2404/LTC2408 4/8 24 No Latency ADC INL: 4ppm LTC2411 LTC2413 24 No Latency ADC 24 No Latency ADC 24 No Latency LTC2424/LTC2428 4/8 36 20 10ppm/ 2.5V 5V MSOP PDIP SO-8 SOT-23 No Latency ΔΣ ADC INL 4ppm 10ppm LTC2401/LTC2402 1/2 LTC2410 1.6μVP-P 5ppm/ No Latency 200μA LTC2420 MSOP 10ppm 200μA : 800nV : 1.6μV ADC - 2.7V5.5V 10 50Hz/60Hz ADC TO-92 INL: 8ppm MSOP 0.16ppm 1.2ppm 2420f LT/LCG 1000 • PRINTED IN JAPAN 〒102-0094 東京都千代田区紀尾井町3-6紀尾井町パークビル8F TEL 03-5226-7291 FAX 03-5226-0268 www.linear-tech.co.jp ● ● LINEAR TECHNOLOGY CORPORATION 2000