The ADL5310 is a low-cost dual logarithmic amplifier that converts input current over a wide dynamic range to a linear-in-dB output voltage. It is optimized for the determination of optical power in wide-ranging optical communication system applications including control circuitry for lasers, optical switches, attenuators, and amplifiers, as well as general system monitoring. The device is equivalent to a dual AD8305 with enhanced dynamic range (120 dB). While the ADL5310 contains two independent signal channels with individually-configurable transfer function constants (slope and intercept), internal bias circuitry is shared between channels for improved power consumption and channel matching. Dual converters in a single compact LFCSP package yield space-efficient solutions for measuring gain or attenuation across optical elements. Only a single supply is required, while optional dual supply operation offers added flexibility.
The ADL5310 employs an optimized translinear structure, which utilizes the accurate logarithmic relationship between a bipolar transistor's base-emitter voltage and collector current, with appropriate scaling by precision currents to compensate the inherent temperature dependence. Input and reference current pins sink current ranging from 3 nA to 3 mA (limited to ±60 dB between input and reference) into a fixed voltage defined by the VSUM potential, which is internally set to 500 mV but may be externally-grounded for dual-supply operation and additional applications requiring voltage inputs.
Features and BenefitsLaw conformance 0.3 dB from 3 nA to 3 mA Optional adjustment of slope and intercept (LFCSP 4 mm × 4 mm) | OpticalAmplifiers |
| Document | note |
| ADL5310: 120dB-range (3 nA - 3 mA) Dual Logarithmic Converter Data Sheet (Rev. A) | PDF 668 kB |
| Document | note |
| AN-643: Closed-Loop Control Circuit Implementation of the ADuC832 MicroConverter®IC and the AD8305 Logarithmic Converter in a Digital Variable Optical Attenuator (Rev. 0) | PDF 395 kB |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| ADL5310ACP-R2 Obsolete | 24 ld LFCSP (4x4mm w/2.10mm EP) | REEL 250 | 0 | 0 | N | |
| ADL5310ACP-REEL7 Obsolete | 24 ld LFCSP (4x4mm w/2.10mm EP) | REEL 1500 | 0 | 0 | N | |
| ADL5310ACP-WP Obsolete | 24 ld LFCSP (4x4mm w/2.10mm EP) | REEL 64 | 0 | 0 | N | |
| ADL5310ACPZ-REEL7 Production | 24 ld LFCSP (4x4mm w/2.10mm EP) | REEL 1500 | -40 to 85C | 0 | 11.47 | Y |
| Part Number | Description | Price | RoHS |
|---|---|---|---|
| ADL5310-EVALZ | Evaluation Board for 24 Lead LFCSP | 100.19 | Y |
