ES5 CYRUSTEK | Alldatasheet
Document overview
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Technical content
Features
True RMS-To-DC Conversion Computes RMS of AC and DC Signals 600mV full scale Wide Response： 1MHz 3dB Bandwidth for VRMS＞ 100mVRMS Single or Dual Supply Operation Power Down Function: Quiescent current reduction from 1.2mA to 5uA Buffered V oltage Output 14-lead SOIC (150mil width)
Description
The ES5 is a true RMS-to-DC converter. It accepts low-level input signals from 0 to 600 mVRMS complex input waveforms . It can be operated form either a single supply or dual supplies. The device draw s less than 1.2 mA of quiescent supply current, furthermore, a chip select pin is provided to power-down mode of the device, making it ideal for battery -powered applications. Application * Digital Multi-Meters * Battery-Powered Instruments * Panel Meter Pin Assignment ES6 T OP VI EW ( Not to Scale ) NC = NO CONNECT B UFF I N NC C O MMO N O U TP U T O FF S ET CS DE N INPUT NC B UFF O UT V NC - V R MS O UT C AV IN S S SOP 14Pin Package ES5
Ver 1.1 14/10/21 2 ES5 True RMS-to-DC Converter Pin Description Pin No Symbol Type Description
1 BUFF IN I Buffer Input
2 NC - No Connection
3 COMMON G Analog Common
4 OUTPUT OFFSET O Output Offset
5 CS I Chip Select
6 DEN INPUT I Denominator Input
7 NC - No Connection
8 CAV I/O Averaging Capacitor Connection
9 RMS OUT O RMS Output
10 -Vs P Negative Supply Rail 11 +Vs P Positive Supply Rail
12 NC - No Connection
13 VIN I Signal input
14 BUFF OUT O Buffer Output
Ver 1.1 14/10/21 3 ES5 True RMS-to-DC Converter
Electrical Characteristics
(TA= +25℃, Vs = +3V , -Vs = -3V , unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS Transfer Equation VOUT = [avg.(VIN)2]1/2 Averaging Time Constant Figure 3 25 ms/μF CAV CONVERSION ACCURACY Total Error, Internal Trim (Notes 1,2) ±0.5 ±1.0 mV ±% of Reading Total Error vs. Temperature ±0.01 mV ±% of Reading/℃ Total Error vs. Supply +VIN=300mV - VIN=-300mV 30 100 150 300 μV ±% of DC Reversal Error Vin= 600mV ±0.3 ±% of Reading Total Error, External Trim (Note 1) ±0.25 ±0.1 mV ±% of Reading ERROR vs. CREST FACTOR Additional Error (Note 3) Crest Factor 1 to 2 Crest Factor = 3 Crest Factor = 6 Specified Accuracy ±0.1 ±0.5 ±% of Reading FREQUENCY RESPONSE (Note 2,4) Bandwidth for 1% Additional Error (0.09dB) VIN =10mV VIN =100mV VIN =600mV 200 KHz KHz KHz ±3dB Bandwidth VIN =10mV VIN =100mV VIN =600mV 130 KHz MHz MHz INPUT CHARACTERISTICS Input Signal range Continuous RMS, All Supplies 0 to 600 mVRMS Peak Transient ±3.0V Supplies ±5V Supplies 2.2
5.0 VPK
Input Resistance 6 KΩ Input Offset Voltage ±0.5 mV OUTPUT CHARACTERISTICS (Note 1) Offset Voltage (Vin=COM) TA=+25℃ ±0.5 mV Output Voltage Swing +3V, -3V Supplies 2.2 V Output Current 5 mA Short-Circuit Current 18 mA Output Resistance Chip Select High Chip Select Low 0.5 100 Ω KΩ DENOMINATIOR INPUT Input Range 0 to 2 V Input Resistance 25 kΩ Offset Voltage ±0.2 V BUFFER AMPLIFIER Input and Output Voltage Range -Vs to (+Vs-1.8V) V Input Offset Voltage ±0.8 ±1.5 mV Input Current ±50 nA Input Resistance 108 Ω Output Current 5 mA Short-Circuit Current 20 mA Small-Signal Bandwidth 1 MHz Slew Rate (Note 5) 5 V/μs
Ver 1.1 14/10/21 4 ES5 True RMS-to-DC Converter Electrical Characteristics (continued) (TA= +25℃, Vs = +3V , -Vs = -3V , unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS Power SUPPLY Dual Supplies ±2.5 ±6 V Standby Current Connect CS to –Vs and Pin4 is connected to COMMON (Figure.1). 2 μA Quiescent Current (Note 6) 1 mA Note 1: Accuracy is specified for 0 to 600mV, 1kHz sine-wave input. Accuracy is degraded at higher RMS signal levels. Note 2: Measured at pin9 (RMS OUT), with pin 4 tied to COMMON. Note 3: Error vs. crest factor is specified as an additional error for 300mVRMS rectangular pulse input, pulse width = 200μs. Note 4: Input voltages are expressed in volts VRMS Note 5: With 10 kΩ external pull-down resistor from pin 14 (BUFF OUT) to – Vs. Note 6: With BUF input tied to COMMON.
ac-couples by adding a capacitor in series with the input, as shown in Figure 1. places as close to the device as possible. signal can be used buffered or nonbuffered, depending on the characteristics of the load. capable of driving 5mA into a 2KΩ load without degrading the accuracy of the device. Figure 1. Standard connection for ES5
the scale factor. Connect the desired full scale to VIN by usin g a DC or AC signal (ex. 500mVRMS), and R3 is trimmed to give the correct value for a calibrated signal. Figure 2. Optional External Gain and Offset Trims
average (or DC) error plus some amount of ripple. chosen to be at least ten times the signal period. step change in the input signal level.
- The 1-pole or 2 -pole filter configuration allows a smaller C
frequency of interest. And the output ripple will be removed by the post filter. Figure 3. 2-Pole Filter
Ver 1.1 14/10/21 8 ES5 True RMS-to-DC Converter Packaging
1.14 Pin SOP Package
- Dimension Paramenters