ADA4861-3YRZ Analog Devices Inc, ADA4861-3YRZ Datasheet - Page 13

• Manufacturer Part Number: ADA4861-3YRZ
• Description: IC OPAMP CF TRPL LP 100MA 14SOIC
• Manufacturer: Analog Devices Inc

Specifications of ADA4861-3YRZ

• Slew Rate: 910 V/µs
• Amplifier Type: Current Feedback
• Number Of Circuits: 3
• -3db Bandwidth: 370MHz
• Current - Input Bias: 2.9µA
• Voltage - Input Offset: 100µV
• Current - Supply: 17.9mA
• Current - Output / Channel: 100mA
• Voltage - Supply, Single/dual (±): 5 V ~ 12 V, ±2.5 V ~ 6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Op Amp Type: High Speed
• No. Of Amplifiers: 3
• Bandwidth: 730MHz
• Supply Voltage Range: 5V To 12V
• Amplifier Case Style: SOIC
• No. Of Pins: 14
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Gain Bandwidth Product: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

APPLICATIONS
GAIN CONFIGURATIONS
Unlike conventional voltage feedback amplifiers, the feedback
resistor has a direct impact on the closed-loop bandwidth and
stability of the current feedback op amp circuit. Reducing the
resistance below the recommended value can make the amplifier
response peak and even become unstable. Increasing the size
of the feedback resistor reduces the closed-loop bandwidth.
Table 5 provides a convenient reference for quickly determining
the feedback and gain set resistor values and bandwidth for
common gain configurations.
Table 5. Recommended Values and Frequency Performance
Gain
+1
−1
+2
+5
+10
1
Figure 46 and Figure 47 show the typical noninverting and
inverting configurations and recommended bypass capacitor
values.
Conditions: V
R
499
301
301
200
200
F
V
(Ω)
IN
S
V
= ±5 V, T
IN
R
G
R
R
N/A
301
301
49.9
22.1
G
G
(Ω)
A
Figure 46. Noninverting Gain
= 25°C, R
Figure 47. Inverting Gain
R
ADA4861-3
+
–
F
ADA4861-3
–
+
−3 dB SS BW (MHz)
730
350
370
180
80
R
F
–V
+V
L
= 150 Ω.
S
S
–V
+V
S
S
0.1µF
0.1µF
10µF
10µF
0.1µF
0.1µF
10µF
10µF
V
Large Signal
0.1 dB Flatness
90
60
100
30
15
OUT
V
OUT
Rev. A | Page 13 of 16
1
20 MHz ACTIVE LOW-PASS FILTER
The ADA4861-3 triple amplifier lends itself to higher order
active filters. Figure 48 shows a 28 MHz, 6-pole, Sallen-Key
low-pass filter.
The filter has a gain of approximately 23 dB and flat frequency
response out to 22 MHz. This type of filter is commonly used at
the output of a video DAC as a reconstruction filter. The frequency
response of the filter is shown in Figure 49.
V
IN
562Ω
R1
–10
–20
–30
–40
–50
–60
–70
30
20
10
0
Figure 49. 20 MHz Low-Pass Filter Frequency Response
1
C1
10pF
562Ω
562Ω
R2
Figure 48. 28 MHz, 6-Pole Low-Pass Filter
210kΩ
R3
R11
562Ω
R5
C2
10pF
C3
10pF
562Ω
R4
210Ω
301Ω
R9
R12
–
+
OP AMP
C5
10pF
562Ω
FREQUENCY (MHz)
U1
R6
C4
10pF
210Ω
R7
10
301Ω
R10
–
+
OP AMP
C6
10pF
OUT
U2
301Ω
–
+
OP AMP
R8
U3
OUT
ADA4861-3
OUT
100
200
V
OUT