ES51919/ES51920 LCR meter chipset Features Application • 19,999/1,999 counts dual LCD display Handheld LCR bridge meter • Current consumption: Typ. 25mA @ 100kHz • QFP-100L package for ES51919 • SSOP-48L package for ES51920 Description The chipset of ES51919/ES51920 is suitable for LCR bridge application. By using AutoLCR smart check and measurement ES51919/ES51920 to implement the LCR bridge meter, the complicated PCB design is Series/Parallel modes are selectable not necessary. The ES51920 is the analog frond Ls/Lp/Cs/Cp with D/Q/θ/ESR parameters end chip with resistor switches network to Open/Short calibration for AC impedance provide different ranges control. It also measurement is allowed: provides a high performance integrated circuit Open condition requirement: Impedance is by the signal with different frequency to larger than 9.5MΩ @ 1kHz measure the complex impedance of the DUT Short condition requirement: Impedance is less by 5-terminals architecture. The ES51919 is than 1.1Ω the mix-mode processing chip to handle the • 4-wire terminal with guarding measurement • • • • • Support DCR mode 200.00Ω~200.0MΩ • Five different test frequency are available: 100/120/1k/10k/100k Hz • Test ac signal level: 0.6mVRMS typ. • 6 range resistor range used • Test range: L: 20.000 µH ~ 2000 H C: 200.00 pF ~ 20.00 mF R: 20.000 Ω ~ 200.0 MΩ • Multi-level battery voltage detector • Support Backlight & Buzzer sound driver • Source resistance depends on range calculation of the D/Q/ESR/θ parameter with Ls/Lp/Cs/Cp values. It also provides the user interface and LCD drivers to support dual display operation. Tolerance mode and relative mode are including in the dual display operation. A multiple-level battery detection and auto power-off scheme are built-in to help the improvement of battery life. The high performance of 4.5digits ADC circuit design is implemented in the ES51919/ES51920 chipset. A fully smart measurement for L/C/R is possible. User could measure the DUT impedance simply without change function key at the AUTOLCR smart mode Min: 120Ω typical Max:1MΩ typical Ver 2.3 1 12/03/01 Introduction The ES51919/ES51920 chipset is a total solution for high accuracy LCR meter which could measure Inductance/Capacitance/Resistance with secondary parameters including dissipation factor(D), quality factor(Q), phase angle(θ), equivalent series/parallel resistance(ESR or Rp). The chipset is fully auto ranging operation for AC impedance & DC resistance measurement. Because of high integrated circuit design, a smart measurement for L/C/R is possible (AUTOLCR mode). It means the user could measure the L/C/R components directly at AUTOLCR smart mode without changing the function key. User could also select the target test frequencies of 100Hz/120Hz/1kHz/10kHz/100kHz depending on DUT type. Components could be measured in series or parallel mode according to the DUT impedance automatically. The LCR chipset built-in a 4.5 digits ADC operates at 1.2/s updating rate nominally for L/C/R mode. The chipset operates at 0.5/s updating rate for DCR mode. The general DMM could measure DC resistance only, but the LCR meter could measure DC resistance and AC impedance. The impedance consists of resistance (real part) and reactance (imaginary part). For example, Zs represents the impedance in series mode. Zs can be defined a combination of resistance Rs and reactance Xs. It also could be defined as a |Z| of magnitude with a phase angle θ. Imaginary axis (series mode) Zs = Rs + jXs Xs | Zs | θ>0 θ θ1 Rs1 Rs Real axis θ1 < 0 Xs1 Zs1 = Rs1 + jXs1 Zs = Rs + jXs or |Zs|∠θ Ver 2.1 2 12/03/01 |Z| = Rs 2 + Xs 2 Rs = |Zs| cosθ Xs = |Zs| sinθ Xs/Rs = tanθ θ = tan-1(Xs/Rs) If θ > 0, the reactance is inductive. In other words, if θ < 0, the reactance is capacitive. There are two types for reactance. The one is the inductive reactance XL and the other is the capacitive reactance XC. They could be defined as: (f = signal frequency) XL = 2πf L (L = Inductance) XC = 1 (C = Capacitance) 2π f C Measurement mode The impedance could be measured in series or parallel mode. The impedance Z in parallel mode could be represented as reciprocal of admittance Y. The admittance could be defined as Y = G + jB. The G is the conductance and the B is the susceptance. Admittance in parallel mode Impedance in serial mode Rs Rp jXs jXp Z = Rs + jXs Y = 1/Z = 1/Rp + 1/jXp = G + jB Rs: Resistance in series mode Rp: Resistance in parallel mode Xs: Reactance in series mode Xp: Reactance in parallel mode Cs: Capacitance in series mode Cp: Capacitance in parallel mode Ls: Inductance in series mode Lp: Inductance in parallel mode There are two factors to provide the ratio of real part and imaginary part. Usually the quality factor Q is used for inductance measurement and the dissipation factor D is used for capacitance measurement. D factor is defined as a reciprocal of Q factor. Q = 1 / D = tanθ Q = Xs / Rs = 2πf Ls / Rs = 1 / 2πf Cs Rs Q = B / G = Rp / | Xp | = Rp / 2πf Lp = 2πf Cp Rp Ver 2.1 3 12/03/01 Actually, Rs and Rp are existed in the equivalent circuit of capacitor or inductor. If the capacitor is small, Rp is more important than Rs. If capacitor is large, the Rs is more important also. Therefore, use parallel mode to measure lower value capacitor and use series mode to measure higher value capacitor. For inductor, the impedance relationship is different from capacitor. If the inductor is small, Rp is almost no effect. If inductor is large, the Rs is no effect also. Therefore, use series mode to measure lower value inductor and use parallel mode to measure higher value inductor. Open/short calibration The ES51919/ES51920 chipset provides the open/short calibration process to get the better accuracy for high/low impedance measurement. The purpose of open/short calibration is to reduce the parasitic effect of the test fixture. ZM is defined as total impedance measured to DUT by the special test fixture which 1 has some parasitic impedance. ZM = (Rs + jωLs) + ( || ZDUT) Go + jωCo ZOUT is the target impedance user wants to realize. It is necessary to use the open/short calibration process to cancel the effect of Rs + jωLs and Go+jωCo. Ver 2.1 4 12/03/01 Equivalent circuit ZSHORT ZM YOPEN ZDUT ZDUT = Ver 2.1 5 ZM – ZSHORT 1-(ZM-ZSHORT)YOPEN 12/03/01 Resistance display range Function RS/RP Ver 2.1 Frequency 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 1kHz 1kHz 1kHz 1kHz 1kHz 1kHz 1kHz 1kHz 10kHz 10kHz 10kHz 10kHz 10kHz 10kHz 10kHz 100kHz 100kHz 100kHz 100kHz 100kHz 100kHz Scale Range 200.00Ω 2.0000kΩ 20.000kΩ 200.00kΩ 2.0000MΩ 20.000MΩ 200.0MΩ 20.000Ω 200.00Ω 2.0000kΩ 20.000kΩ 200.00kΩ 2.0000MΩ 20.000MΩ 200.0MΩ 20.000Ω 200.00Ω 2.0000kΩ 20.000kΩ 200.00kΩ 2.0000MΩ 20.00MΩ 20.000Ω 200.00Ω 2.0000kΩ 20.000kΩ 200.00kΩ 2.000MΩ 6 Resolution 0.01Ω 0.1Ω 1Ω 0.01kΩ 0.1kΩ 1kΩ 0.1MΩ 1mΩ 0.01Ω 0.1Ω 1Ω 0.01kΩ 0.1kΩ 1kΩ 0.1MΩ 1mΩ 0.01Ω 0.1Ω 1Ω 0.01kΩ 0.1kΩ 0.01MΩ 1mΩ 0.01Ω 0.1Ω 1Ω 0.01kΩ 1kΩ 12/03/01 DC resistance display range Function DCR Scale Range 200.00Ω 2.0000kΩ 20.000kΩ 200.00kΩ 2.0000MΩ 20.000MΩ 200.0MΩ Resolution Scale Range 20.000nF1 200.00nF 2000.0nF 20.000uF 200.00uF 2000.0uF 20.00mF 2000.0pF 20.000nF 200.00nF 2000.0nF 20.000uF 200.00uF 2000uF 200.00pF 2000.0pF 20.000nF 200.00nF 2000.0nF 20.000uF 200.0uF 200.00pF 2000.0pF 20.000nF 200.00nF 2000.0nF 20.00uF Resolution 0.01Ω 0.1Ω 1Ω 0.01kΩ 0.1kΩ 1kΩ 0.1MΩ Capacitance display range Function CS/CP 1 Frequency 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 1kHz 1kHz 1kHz 1kHz 1kHz 1kHz 1kHz 10kHz 10kHz 10kHz 10kHz 10kHz 10kHz 10kHz 100kHz 100kHz 100kHz 100kHz 100kHz 100kHz 1pF 0.01nF 0.1nF 1nF 0.01uF 0.1uF 0.01mF 0.1pF 1pF 0.01nF 0.1nF 1nF 0.01uF 1uF 0.01pF 0.1pF 1pF 0.01nF 0.1nF 1nF 0.1uF 0.01pF 0.1pF 1pF 0.01nF 0.1nF 0.01uF If the counts of LCD display are less than 2000, the unit will be “pF”. Ver 2.1 7 12/03/01 Inductance display range Function LS/LP 2 Frequency 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 100Hz/120Hz 1kHz 1kHz 1kHz 1kHz 1kHz 1kHz 1kHz 10kHz 10kHz 10kHz 10kHz 10kHz 10kHz 100kHz 100kHz 100kHz 100kHz 100kHz Scale Range 20.000mH2 200.00mH 2000.0mH 20.000H 200.00H 2000.0H 20.000kH 2000.0uH 20.000mH 200.00mH 2000.0mH 20.000H 200.00H 2000.0H 200.00uH 2000.0uH 20.000mH 200.00mH 2000.0mH 20.000H 20.000uH 200.00uH 2000.0uH 20.000mH 200.00mH Resolution 1uH 0.01mH 0.1mH 1mH 0.01H 0.1H 0.001kH 0.1uH 1uH 0.01mH 0.1mH 1mH 0.01H 0.1H 0.01uH 0.1uH 1uH 0.01mH 0.1mH 1mH 0.001uH 0.01uH 0.1uH 1uH 0.01mH If the counts of LCD display are less than 2000, the unit will be “uH”. Ver 2.1 8 12/03/01 Accuracy (Ae) vs. Impedance (ZDUT) @ Ta =18 ~ 28 ℃ Freq. / Z DCR 100/120Hz 1kHz 10kHz 100kHz 0.1- 1Ω 1.0%+5d 1.0%+5d 1.0%+5d 1.0%+5d 2.0%+5d 1 – 10Ω 0.5%+3d 0.5%+3d 0.5%+3d 0.5%+3d 1.0%+5d 10 – 100kΩ 0.3%+2d 0.3%+2d 0.3%+2d 0.3%+2d 0.5%+3d 100k – 1MΩ 0.5%+3d 0.5%+3d 0.5%+3d 0.5%+3d 1.0%+5d 1M – 20ΜΩ 20Μ− 200MΩ 1.0%+5d 2.0%+5d 1.0%+5d 2.0%+5d 1.0%+5d 5.0%+5d 2.0%+5d N/A 2.0%+5d (1M – 2MΩ) Remark D < 0.1 Note: All accuracy is guaranteed by proper ratio resistor calibration and open/short calibration. All accuracy is guaranteed for 10cm distance from VDUTH/VDUTL pins of ES51920. 1+ D2 If D > 0.1, the accuracy should be multiplied by ZC = 1/2πf C ZL = 2πf L if D << 0.1 in capacitance mode if D << 0.1 in inductance mode Sub-display parameters accuracy Ae = impedance (Z) accuracy Definition: Q = 1 D Rp = ESR (or Rs) × (1+ 1 D2 ) 1. D value accuracy De = + Ae × (1+D) 2. ESR accuracy Re= + ZM × Ae (Ω) ie., ZM = impedance calculated by 1 3. 2πfC or 2πf L Phase angle θ accuracy θe= + (180/π) × Ae (deg) 4-terminals measurement with guard shielding The DUT test leads are implemented by four terminals measurement. For achieve the accuracy shown above, it is necessary to do open/short calibration process before measurement. The test leads for DUT should be as short as possible. If long extended cable is used, the guard shielding is necessary. Ver 2.1 9 12/03/01 ES51920 Package information (SSOP-48L) Ver 2.1 10 12/03/01 ES51919 Package information (QFP-100L) Ver 2.1 11 12/03/01