AD8436
RECOMMENDED FOR NEW DESIGNSLow Cost, Low Power, True RMS-to-DC Converter
- Part Models
- 12
- 1ku List Price
- Starting From $3.48
Part Details
- Delivers true rms or average rectified value of ac waveform
- Fast settling at all input levels
- Accuracy: ±10 μV ± 0.25% of reading (B grade)
- Wide dynamic input range
- 100 μV rms to 3 V rms (8.5 V p-p) full-scale input range
- Larger inputs with external scaling
- Wide bandwidth:
- 1 MHz for −3 dB (300 mV)
- 65 kHz for additional 1% error
- Zero converter dc output offset
- No residual switching products
- Specified at 300 mV rms input
- Accurate conversion with crest factors up to 10
- Low power: 300 μA typical at ±2.4 V
- High-Z FET separately powered input buffer
- RIN ≥ 1012 Ω, CIN ≤ 2 pF
- Precision dc output buffer
- Wide power supply voltage range
- Dual: ±2.4 V to ±18 V; single: 4.8 V to 36 V
- 4 mm × 4 mm LFCSP and 8 mm × 6 mm QSOP packages
- ESD protected
The AD8436 is a new generation, translinear precision, low power, true rms-to-dc converter loaded with options. It computes a precise dc equivalent of the rms value of ac waveforms, including complex patterns such as those generated by switch mode power supplies and triacs. Its accuracy spans a wide range of input levels 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.
The precision dc output buffer minimizes errors when driving low impedance loads with extremely low offset voltages, thanks to internal bias current cancellation. Unlike digital solutions, the AD8436 has no switching circuitry limiting performance at high or low amplitudes. A usable response of <100 μV and >3 V extends the dynamic range with no external scaling, accommodating demanding low level signal conditions and allowing ample overrange without clipping.
The AD8436 operates from single or dual supplies of ±2.4 V (4.8 V) to ±18 V (36 V). A and J grades are available in a compact 4 mm × 4 mm, 20-lead chip-scale package; A and B grades are available in a 20-lead QSOP package. The operating temperature ranges are −40°C to 125°C for A and B grades and 0°C to 70°C for J grade.
Documentation
Data Sheet 1
Application Note 1
Technical Articles 1
Frequently Asked Question 1
Video 1
Technical Book 2
3rd Party Solutions 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD8436ACPZ-R7 | 20-Lead LFCSP (4mm x 4mm w/ EP) | ||
| AD8436ACPZ-RL | 20-Lead LFCSP (4mm x 4mm w/ EP) | ||
| AD8436ACPZ-WP | 20-Lead LFCSP (4mm x 4mm w/ EP) | ||
| AD8436ARQZ | 20-Lead QSOP | ||
| AD8436ARQZ-R7 | 20-Lead QSOP | ||
| AD8436ARQZ-RL | 20-Lead QSOP | ||
| AD8436BRQZ | 20-Lead QSOP | ||
| AD8436BRQZ-R7 | 20-Lead QSOP | ||
| AD8436BRQZ-RL | 20-Lead QSOP | ||
| AD8436JCPZ-R7 | 20-Lead LFCSP (4mm x 4mm w/ EP) | ||
| AD8436JCPZ-RL | 20-Lead LFCSP (4mm x 4mm w/ EP) | ||
| AD8436JCPZ-WP | 20-Lead LFCSP (4mm x 4mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 4, 2023 - 22_0142 Qualification of an Alternate Wafer Fab for High Voltage Bipolar Products (HVBIP) to Analog Devices, Inc. Wilmington MA |
||
| AD8436ACPZ-R7 | PRODUCTION | |
| AD8436ACPZ-RL | PRODUCTION | |
| AD8436ACPZ-WP | ||
| AD8436ARQZ | PRODUCTION | |
| AD8436ARQZ-R7 | PRODUCTION | |
| AD8436ARQZ-RL | PRODUCTION | |
| AD8436BRQZ | PRODUCTION | |
| AD8436BRQZ-R7 | PRODUCTION | |
| AD8436BRQZ-RL | PRODUCTION | |
| AD8436JCPZ-R7 | PRODUCTION | |
| AD8436JCPZ-RL | PRODUCTION | |
| AD8436JCPZ-WP | ||
|
Apr 3, 2017 - 16_0230 Assembly Transfer of Select LFCSP Products to ASE Korea |
||
| AD8436ACPZ-R7 | PRODUCTION | |
| AD8436ACPZ-RL | PRODUCTION | |
| AD8436ACPZ-WP | ||
| AD8436JCPZ-R7 | PRODUCTION | |
| AD8436JCPZ-RL | PRODUCTION | |
|
May 11, 2014 - 13_0231 Assembly Transfer of Select 4x4 and 5x5mm LFCSP Products to STATS ChipPAC China. |
||
| AD8436ACPZ-R7 | PRODUCTION | |
| AD8436ACPZ-RL | PRODUCTION | |
| AD8436JCPZ-R7 | PRODUCTION | |
| AD8436JCPZ-RL | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- AD8436
SPICE Model 1
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
AD8436 Evaluation Board