OPA685

Features:

· GAIN = +2 BANDWIDTH (900MHz)
· GAIN = +8 BANDWIDTH (420MHz)
· OUTPUT VOLTAGE SWING: ±3.6V
· ULTRA-HIGH SLEW RATE: 4200V/ms
· 3RD-ORDER INTERCEPT: > 40dBm (f < 50MHz)
· LOW POWER: 129mW
· LOW DISABLED POWER: 3mW


Application

· LOW COST PRECISION IF AMPLIFIER
· CABLE MODEM UPSTREAM DRIVER
· BROADBAND VIDEO LINE DRIVER
· VERY WIDEBAND ADC BUFFER
· PORTABLE INSTRUMENTS
· ACTIVE FILTERS
· ARB WAVEFORM OUTPUT DRIVER


Pinout




Specifications

Power Supply ..............................................................................±6.5VDC
Internal Power Dissipation ................................ See Thermal Information
Differential Input Voltage ............................................................... ±1.2V
Input Voltage Range ......................................................................... ±V_S
Storage Temperature Range: U, N .................................40 to +125
Lead Temperature (soldering, 10s) .............................................. +300
Junction Temperature (T_J ) ........................................................... +175


Description

The OPA685 is a very high bandwidth, current-feedback op amp that combines exceptional 4200V/ms slew rate and low input voltage noise to deliver a precision low cost, high dynamic range Intermediate Frequency (IF) amplifier. Optimized for high gain operation, the OPA685 is ideally suited to buffering Surface Acoustic Wave (SAW) filters in an IF strip or delivering high output power at low distortion for cable modem upstream line drivers. Even higher bandwidth at lower gains gives a 900MHz video line driver for high resolution workstation graphics.

The OPA685's low 12.9mA supply current is precisely trimmed at +25. This trim, along with a low temperature drift, guarantees low system power over-temperature. System power may be further reduced using the optional disable control pin. Leaving this pin open, or holding it HIGH, gives normal operation. If pulled LOW, the OPA685 supply current drops to less than 320mA. This power-savings feature, along with exceptional single +5V operation, and ultra-small SOT23-6 packaging, make the OPA685 ideal for portable communications requirements.