The ADA4084-1 (single), ADA4084-2 (dual), and ADA4084-4 (quad) are single-supply, 10 MHz bandwidth amplifiers with rail-to-rail input and output characteristics. They are guaranteed to operate from a +3 V to +30 V (or ±1.5 V to ±15 V) supply.
This amplifier is ideal for single-supply applications that require AC performance and precision DC performance. The combination of wide bandwidth, low noise and precision makes the ADA4084-1, ADA4084-2 and ADA4084-4 suitable for a wide range of applications such as filters and instrumentation.
With rail-to-rail input and output swings, designers can build multi-stage filters in a single-supply system while maintaining a high signal-to-noise ratio.
ADA4084-1 features:
1, rail-to-rail input / output
2. Low power consumption: 0.625 mA (±15 V, typical value per amplifier)
3. Gain bandwidth product: 15.9 MHz (AV = 100, typical)
4. Unity gain crossing: 9.9 MHz (typical)
ADA4084-1 application:
1, battery-powered instrumentation
2, high-end and low-end detection
3, power control and protection
4, telecommunications
5, DAC output amplifier
6, ADC input buffer
Internal functional block diagram of ADA4084-1:
Figure 1: Internal Functional Block Diagram of the ADA4084-1
ADA4084-1 equivalent application circuit diagram:
Figure 2: ADA4084-1 equivalent application circuit diagram
Figure 2 shows a simplified equivalent circuit for the ADA4084-1/ADA4084-2/ADA4084-4 input stages. It consists of a PNP differential pair (Q1 and Q2) and an NPN differential pair (Q3 and Q4), with two differential pairs working simultaneously. Diodes D100 and D101 are used to clamp the differential input voltage of the ADA4084-2/ADA4084-4 to prevent Zener breakdown of the emitter-base junction of the input transistor. The input stage voltage gain remains low to support input rail-to-rail operation. Two pairs of differential output voltages are connected to the second stage of the ADA4084-2/ADA4084-4, which is a modified composite folded cascade gain stage in the second gain stage; the two pairs of differential output voltages are combined into a single-ended output Signal voltage used to drive the output stage.
ADA4084-1 Chinese data sheet: Download now
More source code and schematic:
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