Packaging information
| Package | Pins VQFN (RGT) | 16 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 3,000 | LARGE T&R |
Features for the LOG200
- Ultra-fast transient response to
low current levels:
- Settling time for 10nA to 100nA step: 240ns rising, 620ns falling (typ)
- Settling time for 100nA to 1µA step: 60ns rising, 150ns falling (typ)
- Wide dynamic range: 10pA to 10mA
(180dB)
- Specified from 100pA to 10mA (160dB)
- High signal bandwidth:
- 20MHz at 10µA to 10mA
- 6.3MHz at 1µA
- 90kHz at 1nA
- High-accuracy transfer function:
- 0.2% max log conformity error (10nA to 100µA)
- Integrated reference current (1µA) and reference voltages (2.5V and 1.65V)
- Additional auxiliary high-speed op amp for differential ADC drive, single-ended gain or filter blocks, and other peripheral functions
- Single supply (4.5V to 12.6V) or dual supply (±2.25V to ±6.3V) operation
- Specified temperature range: –40°C to +125°C
- Small package options:
- 3mm × 3mm VQFN
- 1.6mm x 1.6mm DSBGA (Preview)
Description for the LOG200
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.