The MAX4000/MAX4001/MAX4002 low-cost, low-power logarithmic amplifiers are designed to control RF power amplifiers (PA) operating in the 0.1GHz to 2.5GHz frequency range. A typical dynamic range of 45dB makes this family of log amps useful in a variety of wireless applications including cellular handset PA control, transmitter power measurement, and RSSI for terminal devices. Logarithmic amplifiers provide much wider measurement range and superior accuracy to controllers based on diode detectors. Excellent temperature stability is achieved over the full operating range of -40°C to +85°C. The choice of three different input voltage ranges eliminates the need for external attenuators, thus simplifying PA control-loop design. The logarithmic amplifier is a voltage-measuring device with a typical signal range of -58dBV to -13dBV for the MAX4000, -48dBV to -3dBV for the MAX4001, and -43dBV to +2dBV for the MAX4002. The input signal for the MAX4000 is internally AC-coupled using an on-chip 5pF capacitor in series with a 2kΩ input resistance. This highpass coupling, with a corner at 16MHz, sets the lowest operating frequency and allows the input signal source to be DC grounded. The MAX4001/MAX4002 require an external coupling capacitor in series with the RF input port. These PA controllers feature a power-on delay when coming out of shutdown, holding OUT low for approximately 5µs to ensure glitch-free controller output. The MAX4000/MAX4001/MAX4002 fami
The MAX4000, MAX4001 and MAX4002 are low‑cost, low‑power logarithmic amplifiers designed to control RF power amplifiers from 0.1 GHz to 2.5 GHz. They provide a typical 45 dB dynamic range, excellent temperature stability from –40 °C to +85 °C, and three selectable input‑voltage ranges that eliminate the need for external attenuators.
These devices are supplied in two package styles – an 8‑pin µMAX and an 8‑bump UCSP – and consume only 5.9 mA at a 5.5 V supply. Key features include fast 70 ns 10 dB step response, 10 mA output sourcing capability, and a power‑on delay of about 5 µs to ensure glitch‑free operation.
| Supply Voltage (VCC) | 2.7 V – 5.5 V |
|---|---|
| Logic‑High Threshold (VH) | 1.8 V |
| Logic‑Low Threshold (VL) | 0.8 V |
| Input Resistance (RIN) | 30 MΩ |
| Main Output High Current Source | 10 mA |
| Output Low Current Sink | 350 µA |
| Small‑Signal Bandwidth | 20 MHz |
| Output‑Referred Noise | 8 nV/√Hz |
| Operating Temperature Range | -40 °C to +85 °C |
| RF Input Frequency Range | 100 MHz – 2.5 GHz |
| Input Voltage Range (MAX4000) | -58 dBV to -13 dBV |
| Input Voltage Range (MAX4001) | -48 dBV to -3 dBV |
| Input Voltage Range (MAX4002) | -43 dBV to +2 dBV |
| Typical Dynamic Range | 45 dB |
| Power‑On Delay | ≈5 µs |
| Package Options | 8‑pin µMAX, 8‑bump UCSP |
The devices provide a typical dynamic range of 45 dB.
The output is held low for about 5 µs to ensure a glitch‑free transition.
The supply voltage can be between 2.7 V and 5.5 V.
They are offered in an 8‑pin µMAX package and an 8‑bump UCSP package.