Ultra-Wideband / Current-Feedback OPERATIONAL AMPLIFIER With Disable TM - Burr-Brown
Description
®
OPA 685
OPA 685
OPA685
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Ultra-Wideband, Current-Feedback OPERATIONAL AMPLIFIER With Disable
TM
FEATURES
q q q q q q q GAIN = +2 BANDWIDTH (900MHz) GAIN = +8 BANDWIDTH (420MHz) OUTPUT VOLTAGE SWING: ±3.
6V ULTRA-HIGH SLEW RATE: 4200V/µs 3RD-ORDER INTERCEPT: > 40dBm (f < 50MHz) LOW POWER: 129mW LOW DISABLED POWER: 3mW
APPLICATIONS
q q q q q q q 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
DESCRIPTION
The OPA685 is a very high bandwidth, current-feedback op amp that combines exceptional 4200V/µs 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°C.
This trim, along with a low temperature drift, guarantees low system power overtemperature.
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 320µA.
This power-savings feature, along with exceptional single +5V operation, and ultra-small SOT23-6 packaging, make the OPA685 ideal for portable communications requirements.
OPA685 RELATED PRODUCTS
SINGLES OPA658 OPA681 OPA682 DUALS OPA2658 OPA2681 OPA2682
TWO-TONE, 3rd-ORDER INTERMODULATION INTERCEPT 50
+5V
Output Intercept (dBm)
40
50Ω OPA685
Matching Network 50Ω SAW Filter
30
50Ω Source
50Ω
–5V
400Ω
20
Low Distortion, 12dB Gain SAW Dr...
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