Single-Supply, Fixed G = 2, High Speed,
Video Amplifier with Charge Pump
Data Sheet
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FEATURES
Integrated charge pump
Supply range: 3 V to 5.5 V
Output range: −3.3 V to −1.8 V
50 mA maximum output current at −3 V for external use
High speed amplifiers
−3 dB bandwidth: 195 MHz
Slew rate: 740 V/µs
0.1 dB gain flatness: 60 MHz
0.1% settling time: 20 ns
Low power
Total quiescent current: 38 mA
Power-down feature
High input common-mode voltage range
−1.8 V to +3.8 V at +5 V supply
Current feedback architecture
Differential gain error: 0.01%
Differential phase error: 0.02°
Available in 16-lead LFCSP
APPLICATIONS
Professional video
Consumer video
Imaging
Active filters
CONNECTION DIAGRAM
07715-001
NOTES
1. NC = NO CONNECT.
2. EXPOSED PAD, CONNECT TO GROUND.
ADA4859-3
1
2
C1_a
C1_b
+V
S
+IN3
–IN3
OUT3
OUT1
–IN1
+IN1
NC
CPO
+V
S
3
4
11
–IN2
12
+IN2
CHARGE
PUMP
10
OUT2
9
5 6 7 8
16 15 14 13
PD
Figure 1.
GENERAL DESCRIPTION
The ADA4859-3 (triple) is a single-supply, high speed current
feedback amplifier with an integrated charge pump that eliminates
the need for negative supplies in order to output negative voltages
or output a 0 V level for video applications. The 195 MHz, large
signal −3 dB bandwidth at a fixed gain of 2, as well as the 740 V/µs
slew rate, make this amplifier ideal for high resolution professional
and consumer video applications. The amplifier also has a wide
input common-mode voltage range that extends from 1.8 V
below ground to 1.2 V below the positive rail at 5 V supply.
This triple video amplifier is designed to operate on supply
voltages of 3.3 V to 5 V, using only 38 mA total quiescent
current, including the charge pump. To further reduce the
power consumption, it is equipped with a power-down feature
that lowers the total supply current to as low as 2 mA when the
amplifier is not being used. Even in power-down mode, the
charge pump can be used to power external components. The
maximum output current for external use is 50 mA at −3 V.
The ADA4859-3 is available in a 16-lead LFCSP, and it is designed
to work over the industrial temperature range of −40°C to +105°C.
