Refer to the PDF data sheet for device specific package drawings
The LOG300 is an integrated analog front end (AFE) consisting of low-noise amplifier (LNA) and a Log Detector block. This device supports an input frequency range of up-to 40MHz and a typical dynamic range of 98dB. The LOG300 is intended for use in applications that require a wide dynamic range of voltage and signal measurement. The Log Detector block of LOG300 supports both single-ended and differential inputs. The low input noise of the integrated LNA, allows measurement of signals as low as 7µVP. The transient output response can be adjusted by tuning the capacitor connected at the Log_Out pin. The integrated frequency detect feature of LOG300 enables users to extract input signal frequency and zero-crossing information.
The LOG300 is available in a 16-pin SOIC and 16-pin VQFN package. The LOG300 is operational from a 3V to 5.25V supply and over the full ambient temperature range of –40°C to +125°C.
PART NUMBER | PACKAGE(1) | PACKAGE SIZE(2) |
---|---|---|
LOG300 | D (SOIC, 16) | 9.9mm × 6mm |
RGT (VQFN, 16) | 3mm × 3mm |
PIN | TYPE(1) | DESCRIPTION | ||
---|---|---|---|---|
NAME | NO. | |||
D (SOIC) | RGT (VQFN) | |||
AFE_En | 1 | 14 | I | LNA and Log Detector block enable and disable pin. AFE_En = High for AFE enable. Floating this pin keeps both blocks enabled as well. |
AGND | 13 | 10 | P | Analog ground for LNA and Log detector block |
Buffer | 10 | 7 | O | Noninverting buffered output. VBuffer = VLog_Out × 2. |
DGND | 2 | 15 | P | Digital ground for Freq_Out pin |
Freq_Out | 8 | 5 | O | This pin toggles at the same signal frequency applied at the Log_In. |
Freq_Supply | 7 | 4 | P | Power supply for Freq_Out function. Float this pin if the frequency-detection feature is not required. |
Inv_Buffer | 9 | 6 | O | Inverted buffered output. VInv_Buffer = VCC – VLog_Out × 2. |
LNA_En | 3 | 16 | I | Low-noise amplifier enable and disable. LNA_En = High for LNA enable. Floating this pin keeps the LNA enabled as well. |
LNA_In | 16 | 13 | I | Low-noise amplifier input |
LNA_Out | 14 | 11 | O | Low-noise amplifier output |
Log_Inm | 11 | 8 | I | Inverting input of Log Detector block. Connect an appropriate capacitor to ground when used in a single-ended input. Refer to Section 7.3.2. |
Log_Inp | 12 | 9 | I | Noninverting input of Log Detector block |
Log_Out | 5 | 2 | O | Unbuffered output of Log Detector block. Connect an appropriate resistor RF (to set the input to output slope) and capacitor CF (to set the response time). |
Offset_Cap | 15 | 12 | I | Connect a recommended capacitor from this pin to ground. This capacitor sets the pole of the internal offset correction loop. Refer to Section 7.3.1 for the recommended capacitor. |
Ref_Res | 6 | 3 | I | Connect a 1% 56kΩ resistor to this pin. Float this pin if the default relaxed slope accuracy is acceptable. |
VCC | 4 | 1 | P | Supply |
Thermal Pad |
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Thermal Pad | P | Thermal pad. Electrically isolated from the device. Connect to a heat spreading plane, typically ground. |