High Speed Amplifiers (BW > 50 MHz)
Low Cost Amplifiers
ADA4891: Low Cost CMOS, High Speed, Rail-to-Rail Amplifiers
The ADA4891-1 (single), ADA4891-2 (dual), ADA4891-3 (triple), and ADA4891-4 (quad) are CMOS high speed amplifiers that offer high performance at
a low cost. The amplifiers feature true single-supply capability, with an input voltage range that extends 300 mV below the negative rail. The rail-to-rail
output stage enables the output to swing within 50 mV of each rail, enabling maximum dynamic range. The ADA4891 family of amplifiers is ideal for
imaging applications, such as consumer video, CCD buffers, and contact image sensor buffers. Low distortion and fast settling time also make them ideal
for active filter applications.
Features
•ꢀHigh speed and fast settling
1
•ꢀ −3 dB bandwidth: 240 MHz (G = +1)
0
G = +1
–1
–2
•ꢀ Slew rate: 170 V/µs
R
= 0ꢀ
F
G = +2
= 604ꢀ
R
F
•ꢀ Settling time to 0.1%: 28 ns
–3
•ꢀVideo specifications (G = +2, RL = 150 Ω)
•ꢀ 0.1 dB gain flatness: 25 MHz
–4
G = +5
F
R
= 604ꢀ
–5
•ꢀ Differential gain error: 0.05%
–6
•ꢀ Differential phase error: 0.25°
–7
•ꢀSingle-supply operation
–8
V
= 5V
S
L
•ꢀWide supply range: 2.7 V to 5.5 V
•ꢀ Output swings to within 50 mV of supply rails
•ꢀLow distortion: 79 dBc SFDR @ 1 MHz
•ꢀLinear output current: 150 mA @ −50 dBc
•ꢀLow power of 4.4 mA per amplifier
–9
R
= 150ꢀ
V
= 2V p-p
OUT
–10
0.1
1
10
100
1k
FREQUENCY (MHz)
Large signal frequency response vs. gain, VS = 5 V, ADA4891-1/ADA4891-2.
Applications
•ꢀImaging
•ꢀConsumer video
•ꢀActive filters
•ꢀCoaxial cable drivers
•ꢀClock buffers
•ꢀPhotodiode preamp
•ꢀContact image sensor and buffers
Low Cost Amplifiers
Distortion
Supply
Voltage
(V)
BW @ Slew
ACL Min Rate
(MHz) (V/ms)
Price
@ 1k
(OEM $US)
SFDR1 @ BW
Part
Number
No. of
Amps
ACL
Min
Noise
(nV/ z)
VOS Max
IB
IS/Amp
IOUT
Temp
Disable
Rail-to-Rail1
Packaging
√H
(mV) (µA Max) (mA Typ) (mA) Range2
(dBc) (MHz)
ADA4851-1
ADA4851-2
ADA4851-4
1
2
4
•
•
•
0.56
0.70
1.10
SOT-23/
TSSOP/MSOP
RRO
1
1
1
105
350
320
375
425
650
–83
–90
–62
1
1
5
10
8
3.5
3
4
0.75
9
2.9
1
90
20
50
H5
2.7, 5, 65
3, 5, 65
2.7, 8
AD8038
AD8039
1
2
•
•
SC70/
SOT-23/ SOIC
0.86
1.21
I
I
AD8061
AD8063
AD8062
1
1
2
0.86
1.62
0.86
SOT-23/
SOIC/ MSOP
•
RRO
8.5
6
6.8
AD8055
AD8056
1
2
SOT-23/
SOIC/ MSOP
0.86
1.62
1
1
300
325
1400
1150
–72
–68
10
5
6
7
5
5
1.2
2.5
5.4
6
60
30
H5
I5
65
AD8057
AD8058
1
2
SOT-23/
SOIC/MSOP
0.86
1.62
3, 5, 65
ADA4891-1
ADA4891-2
ADA4891-3
ADA4891-4
1
2
3
4
•
•
•
•
0.49
0.69
0.89
1.09
SOT-23/SOIC/
TSSOP/MSOP
3, 5
RRO
1
270
166
–80
1
8.8
10
0.002
5
100
H
1 RRIO: rail-to-rail input/output, RRO: rail-to-rail output, SS: single supply (IVR includes –VSY).
2
Temp range: H = extended industrial (–40°C to +125°C), I = industrial (–40°C to +85°C).
Operational Amplifier Selection Guide
38
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