LMH6704MA National Semiconductor, LMH6704MA Datasheet - Page 7

• Manufacturer Part Number: LMH6704MA
• Description: BUFFER, PROGRAMMABLE, 6704, SOIC8
• Manufacturer: National Semiconductor

Specifications of LMH6704MA

• No. Of Amplifiers: 1
• Gain Bandwidth: 650MHz
• Slew Rate: 3000V/µs
• Supply Voltage Range: ± 4V To ± 6V
• Output Current: 90mA
• Amplifier Output: Single Ended
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes

Application Section
FIGURE 1. Recommended Gain of +2 Circuit
FIGURE 2. Recommended Gain of +1 Circuit
FIGURE 3. Recommended Gain of −1 Circuit
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GENERAL INFORMATION
The LMH6704 is a high speed current feedback Program-
mable Gain Buffer (PGB), optimized for very high speed and
low distortion. With its internal feedback and gain-setting
resistors the LMH6704 offers excellent AC performance
while simplifying board layout and minimizing the affects of
layout related parasitic components. The LMH6704 has no
internal ground reference so single or split supply configura-
tions are both equally useful.
SETTING THE CLOSED LOOP GAIN
The LMH6704 is a current feedback amplifier with on-chip
R
+2, A
described in the chart below.
The gain accuracy of the LMH6704 is accurate and guaran-
teed over temperature to within
setting resistors, R
architecture takes advantage of the fact that the internal gain
setting resistors track each other well over a wide range of
temperature and process variation to keep the overall gain
constant, despite the fact that the individual resistors have
nominal temperature drifts. Therefore, using external resis-
tors in series with R
gain accuracy over temperature.
−1 V/V
+1 V/V
+2 V/V
F
GAIN A
= R
FIGURE 4. Alternate Unity Gain Configuration
V
G
= +1, or an A
= 465Ω. As such it can be configured with an A
V
Non-Inverting (Pin 3) Inverting (Pin 4)
Ground
Input Signal
Input Signal
F
and R
G
V
to change the gain will result in poor
= −1 by connecting pins 3 and 4 as
G
Input Connections
, match very well. The LMH6704
±
1%. The internal gain
Input Signal
NC (Open)
Ground
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V
=