100 -ic/" title="HFA1100 Product Specifications, Documentation and Source Information" target="_blank">HFA1100 is a high-speed, broadband, fast-stable, complementary bipolar UHF-1 process using Intersil's proprietary current feedback amplifier .It works with a single supply voltage as low as 4.5V (see Applications Information section). The HFA1100 is a basic op amp with unspecified pins 1, 5, and 8. This device offers significant performance improvements over the AD811 , AD9617/ 18. CLC400-409 and EL2070 , EL2073, EL2030

Note: Intersil lead-free products are packaged with special lead-free materials; molding compound/die attach material and 100% matte tinplate termination finish, RoHS compliant and compatible with SnPb and lead-free soldering. Does Intersil's lead-free product MSL meet or meet the lead-free peak reflow temperature classifications that exceed the lead-free requirements of IPC/JEDEC J STD-020C.

feature

Low distortion (30MHz, HD2). -56dBc company -3dB bandwidth. 850 MHz very fast slew rate. 2300V/µs fast settling time (0.1%). Excellent gain flatness of 11 ns - (100 MHz). ? 0.14 dB-(50 MHz). 0.04dB high output current. 60mA overdrive recovery. <10ns Operates from a single 5V supply (see AN9745) Offers lead-free (RoHS compliant)

application

Video switching and routing

Pulse and Video Amplifiers

RF/IF Signal Processing

Flash A/D Drive

medical imaging system

Related Literature

- AN9420, Current Feedback Theory

-AN9202, HFA11XX Evaluation Fixture

-AN9745, single 5V supply operation

Absolute Maximum Ratings TA=25°C Thermal Information Voltage between V+ and V-. 12 volt input voltage. V Power Differential Input Voltage. 5V output current (50% duty cycle). 60 mA

Operating Conditions: Temperature range. -40°C to 85°C Thermal Resistance (Typical, Note 1) θJA (Celsius/Watt) θJC (Celsius/Watt) PDIP Package. 130 N/year SOIC package. 170N/yr maximum junction temperature (plastic package). 150 degrees Celsius maximum storage temperature range. -65°C to 150°C maximum lead temperature (10s for soldering). 300 degrees Celsius (SOIC - lead only)

CAUTION: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a pressure rating and operation of the device under the above or any other conditions stated in the operating section of this specification is not implied.

Note: 1. θJA is measured in free air with components mounted on the evaluation PC board.

Electrical Specifications V Power = ±5V, AV = +1, RF = 510Ω, RL = 100Ω, unless otherwise specified

Electrical Specifications V Power = ±5V, AV = +1, RF = 510Ω, RL = 100Ω, unless otherwise specified (continued)

notes:

2. Test level: A. Product testing; B. Typical or guaranteed limits based on characteristics; C. Typical design for reference only.

3. See typical performance curves for details.

application information

Closed graph responses for optimal feedback resistor (RF) inversion and non-inversion frequencies detail the HFA1100 at various margins. Although the bandwidth dependence on CL is not as severe as with voltage feedback amplifiers, the bandwidth is significantly reduced at higher gains. This works by exploiting the unique relationship between bandwidth and RF in current feedback amplifiers. All current feedback amplifiers require feedback resistors, even for unity gain applications, and RF, along with internal compensation capacitors, to set the dominant pole of the frequency response. So the bandwidth of the amplifier is inversely proportional to the radio frequency. This HFA1100 design is optimized for 510ΩRF with a gain of +1. Lowering RF in unity-gain applications reduces stability, resulting in excessive peaking and overshoot (note: capacitive feedback causes the same problem because feedback impedance decreases at high frequencies). At higher gain, the amplifier is more stable, so RF can be reduced in a bandwidth stability trade-off. Recommended RF values for various gains are listed below the table, along with expected bandwidth.

5V Single Supply Operation This amplifier operates down to 4.5V from a single supply voltage. The table below details the performance of the amplifier with only one 5V supply. The slowdown of the huge supply flow under this operating condition (see also Figure 23) makes these op amps more suitable for low power 5V systems. For more information, see Application Note AN9745 Information.

Die application in hybrid applications This amplifier is used with compensation to counteract package parasitics that usually lead to instability. As a result, the use of die in hybrid applications can result in performance compensating excessive capacitance due to lower parasitic rates. Reduce RF below the recommended value because the kit can solve this problem. For V=+2 the recommended starting point is 300Ω, unity gain applications should try 400Ω.

PC Board Layout The frequency performance of this amplifier depends on handling considerations when designing the PC board. The use of low inductance components such as chips is highly recommended to use resistors and chip capacitors, and a solid ground is a must! Care should be taken to disconnect the power supply. Large value (10µF) tantalum and small value tantalum parallel chip (0.1µF) capacitors work well in most cases. It is recommended that the input and output of the device. Output capacitance, such as lines due to improper termination of the transmission, can degrade the frequency response of the amplifier and may cause oscillations. In most cases, oscillation can be avoided by placing a resistor in series with the output.

Care must also be taken to minimize capacitance to ground from the inverting input of the amplifier. The larger this capacitance, the worse the gain peaking, leading to impulse overshoot and possible instability. For this, it is recommended to remove the ground plane under the trace to connect to pin 2, the connection to pin 2 should be kept as short as possible. An example of a good high frequency layout is shown below.

The layout and schematic of the board are as follows:

Typical Performance Curves V supply = ±5V, RF = 510Ω, TA = 25°C, RL = 100Ω, unless otherwise specified (continued)

Typical Performance Curves V supply = ±5V, RF = 510Ω, TA = 25°C, RL = 100Ω, unless otherwise specified (continued)

Typical Performance Curves V supply = ±5V, RF = 510Ω, TA = 25°C, RL = 100Ω, unless otherwise specified (continued)