DESCRIPTION
The SA5223 is a wide-band, low-noise transimpedance amplifier with differential outputs, incorporating AGC and optimized for signal recovery in wide-dynamic-range fiber optic receivers, such as SONET. The part is also suited for many other RF and fiber optic applications as a general purpose gain block. The SA5223 is the first AGC amplifier to incorporate internal AGC loop hold capacitor, therefore, no external components are required. The internal AGC loop enables the SA5223 to effortlessly handle bursty data over a range of nA to mA of signal current, positive direction (sinking) only.

FEATURES
• Extremely low noise:1.17pA/√Hz
• Single 5V supply
• Low supply current: 22mA
• Large bandwidth: 150MHz
• Differential outputs
• Internal hold capacitor
• Low input/output impedances
• High power-supply-rejection ratio: 55dB
• Tight transresistance control
• High input overload: 4mA
• 2000V HBM ESD protection

APPLICATIONS
• OC3 SONET preamp (see AN1431 for detailed analysis
• Current-to-voltage converters
• Wide-band gain block
• Medical and scientific instrumentation
• Sensor preamplifiers
• Single-ended to differential conversion
• Low noise RF amplifiers
• RF signal processing