Low Cost CMOS, High Speed,
Rail-to-Rail Amplifiers
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
FEATURES
CONNECTION DIAGRAMS
ADA4891-1
High speed and fast settling
NC
–IN
+IN
1
2
3
4
8
7
6
5
NC
+V
−3 dB bandwidth: 220 MHz (G = +1)
Slew rate: 170 V/μs
Settling time to 0.1%: 28 ns
S
OUT
NC
–V
S
Video specifications (G = +2, RL = 150 Ω)
0.1 dB gain flatness: 25 MHz
Differential gain error: 0.05%
Differential phase error: 0.25°
Single-supply operation
Wide supply range: 2.7 V to 5.5 V
Output swings to within 50 mV of supply rails
Low distortion: 79 dBc SFDR at 1 MHz
Linear output current: 125 mA at −40 dBc
Low power: 4.4 mA per amplifier
NC = NO CONNECT
Figure 1. 8-Lead SOIC_N (R-8)
ADA4891-1
1
2
3
+V
S
OUT
–V
5
4
S
+IN
–IN
Figure 2. 5-Lead SOT-23 (RJ-5)
APPLICATIONS
ADA4891-2
Imaging
Consumer video
Active filters
Coaxial cable drivers
Clock buffers
OUT1
–IN1
1
2
3
4
8
7
6
5
+V
S
OUT2
–IN2
+IN2
+IN1
–V
S
NC = NO CONNECT
Photodiode preamp
Contact image sensor and buffers
Figure 3. 8-Lead SOIC_N (R-8) and 8-Lead MSOP (RM-8)
ADA4891-3
GENERAL DESCRIPTION
PD1
PD2
PD3
1
2
3
4
5
6
7
14 OUT2
13 –IN2
12 +IN2
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.
+V
11 –V
S
S
+IN1
–IN1
10 +IN3
9
8
–IN3
In spite of their low cost, the ADA4891 family provides high
performance and versatility. The rail-to-rail output stage enables
the output to swing to within 50 mV of each rail, enabling maxi-
mum dynamic range.
OUT1
OUT3
Figure 4. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)
ADA4891-4
The ADA4891 family of amplifiers is ideal for imaging applica-
tions, such as consumer video, CCD buffers, and contact image
sensor and buffers. Low distortion and fast settling time also
make them ideal for active filter applications.
1
2
3
4
5
6
7
14
13
OUT4
–IN4
OUT1
–IN1
12 +IN4
+IN1
11
–V
S
+V
S
10
9
+IN3
–IN3
The ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 are avail-
able in a wide variety of packages. The ADA4891-1 is available
in 8-lead SOIC and 5-lead SOT-23 packages. The ADA4891-2
is available in 8-lead SOIC and 8-lead MSOP packages. The
ADA4891-3 and ADA4891-4 are available in 14-lead SOIC and
14-lead TSSOP packages. The amplifiers are specified to operate
over the extended temperature range of −40°C to +125°C.
+IN2
–IN2
8
OUT3
OUT2
Figure 5. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)
Rev. B
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