0
ACTIVE
Input current range (min) (nA) |
0.1 |
Input current range (max) (mA) |
10 |
Offset voltage (input amplifiers) (max) (mV) |
2 |
Vs (±) (min) (V) |
4.5 |
Vs (±) (max) (V) |
12.6 |
Iq (max) (mA) |
9 |
Dynamic range (typ) (dB) |
160 |
Reference type |
Int |
Auxiliary op amps |
1 |
Full-scale output voltage (min) (±V) |
4.8 |
Full-scale output voltage (max) (±V) |
12.3 |
Conformity error (initial 5 decades) (max) (%) |
1.5 |
Conformity error (initial 5 decades) (typ. over temp) (%/°C) |
0.2 |
Operating temperature range (°C) |
-40 to 125 |
Rating |
Catalog |
VQFN (RGT)-16-9 mm² 3 x 3
The LOG200 is a wide-dynamic-range current-to-voltage amplifier specifically designed to optimize current measurements across 160dB of dynamic range with unparalleled accuracy and speed for optical communications, medical diagnostics, and industrial process-control measurements. The LOG200 features two logarithmic amplifiers followed by a high-accuracy differential amplifier that convert current signals into a voltage representing the log-compressed ratio of the two currents. The current inputs are designed to feature a high-speed response from one input, and a highly accurate reference signal on the other input, allowing for a unique combination of fast transient response and high logarithmic conformity.
The LOG200 ratio is internally set to 250mV/decade of current-to-voltage conversion. The device integrates an uncommitted high-speed amplifier to allow the output to be configured for differential or filtered responses, with a fast settling time to drive successive approximation analog-to-digital converters (SAR ADCs). The LOG200 also features a separate reference current and reference voltage designed to configure the device for optimized input current and common-mode voltages.
The LOG200 can be powered in a single-supply (4.5V to 12.6V) or dual-supply (±2.25V to ±6.3V) configuration and is specified from –40°C to +125°C.
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