AD8436 Datasheet – True RMS-to-DC Converter

Part Number : AD8436

Function : Low Cost, Low Power, True RMS-to-DC Converter

Pakcage : 20-Lead Lead Frame Chip Scale [LFCSP_WQ] Type

Manufacturers : Analog Devices

Pinouts :

AD8436 datasheet

Description :

The AD8436 is a new generation, translinear precision, low power, t rue rms-to-dc converter loaded with options. It computes a precise dc equivalent of the rms value of ac wave forms, including complex patterns such as those generated by switch mode power supplies and triacs. Its accuracy spans a wide range of input levels (see Figure 2) and temperatures. The ensured accuracy of ≤±0.5% and ≤10 µV output offset result from the latest Analog Devices, Inc., technology. The
crest factor error is <0.5% for CF values between 1 and 10. The AD8436 delivers true rms results at less cost than misleading peak, averaging, or digital solutions. There is no programming expense or processor overhead to consider, and the 4 mm × 4 mm package easily fits into tight applications. On-board buffer amplifiers enable the widest range of options for any rms-to-dc converter available, regardless of cost. For minimal applications, only a single external averaging capacitor is required. The built-in high impedance FET buffer provides an interface for external attenuators, frequency compensation, or driving low impedance loads. A matched pair of internal
resistors enables an easily configurable gain-of-two or more, extending the usable input range even lower. The low power, precision input buffer makes the AD8436 attractive for use in portable multi-meters and other battery-powered applications.


1. Delivers true rms or average rectified value of ac waveform
2. Fast settling at all input levels
3. Accuracy: ±10 μV ± 0.25% of reading (B grade)
4. Wide dynamic input range
5. 100 μV rms to 3 V rms (8.5 V p-p) full-scale input range
6. Larger inputs with external scaling
7. Wide bandwidth:
8. 1 MHz for −3 dB (300 mV)
9. 65 kHz for additional 1% error
10. Zero converter dc output offset
11. No residual switching products
12. Specified at 300 mV rms input
13. Accurate conversion with crest factors up to 10
14. Low power: 300 µA typical at ±2.4 V
15. High-Z FET separately powered input buffer
16. RIN ≥ 10
17. 12Ω, CIN ≤ 2 pF
18. Precision dc output buffer
19. Wide power supply voltage range
20. Dual: ±2.4 V to ±18 V; single: 4.8 V to 36 V
21. 4 mm × 4 mm LFCSP and 8 mm × 6 mm QSOP packages
22. ESD protected

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AD8436 Datasheet PDF Download

AD8436 pdf