ADA4870 Datasheet, PDF (1/25 Pages) Analog Devices – Ideal for driving high capacitive or low resistive loads

Data Sheet
FEATURES
Ideal for driving high capacitive or low resistive loads
Wide supply range: 10 V to 40 V
High output current drive: 1 A
Wide output voltage swing: 37 V swing with 40 V supply
High slew rate: 2500 V/µs
High bandwidth: 52 MHz large signal, 70 MHz small signal
Low noise: 2.1 nV/√Hz
Quiescent current: 32.5 mA
Power down: 0.75 mA
Short-circuit protection and flag
Current limit: 1.2 A
Thermal protection
APPLICATIONS
Envelope tracking
Power FET driver
Ultrasound
Piezo drivers
PIN diode drivers
Waveform generation
Automated test equipment (ATE)
CCD panel drivers
Composite amplifiers
GENERAL DESCRIPTION
The ADA4870 is a unity gain stable, high speed current
feedback amplifier capable of delivering 1 A of output current
and 2500 V/μs slew rate from a 40 V supply. Manufactured
using the Analog Devices, Inc., proprietary high voltage extra
fast complementary bipolar (XFCB) process, the innovative
architecture of the ADA4870 enables high output power, high
speed signal processing solutions in applications that require
driving a low impedance load.
The ADA4870 is ideal for driving high voltage power FETs,
piezo transducers, PIN diodes, CCD panels, and a variety of
other demanding applications that require high speed from
high supply voltage at high output current.
The ADA4870 is available in a power SOIC package (PSOP_3),
featuring an exposed thermal slug that provides high thermal
conductivity, enabling efficient heat transfer for improved perfor-
mance and reliability in demanding applications. The ADA4870
operates over the industrial temperature range (−40°C to +85°C).
High Speed, High Voltage,
1 A Output Drive Amplifier
ADA4870
FUNCTIONAL BLOCK DIAGRAM
V_CC 1
TFL 2
SD 3
ON 4
NC 5
INP 6
INN 7
OUT 8
NC 9
V_EE 10
ADA4870
Figure 1.
20 V_CC
19 V_CC
18 V_CC
17 OUT
16 OUT
15 OUT
14 OUT
13 V_EE
12 V_EE
11 V_EE
4,000
20
V_OUT
3,000
15
2,000
10
1,000
5
SLEW RATE
0
0
–1,000
–5
–2,000
–10
–3,000
–15
–4,000
–20
TIME (45ns/DIV)
Figure 2. Slew Rate, VS = ±20 V, VOUT = 30 V p-p, AV = +2,
RF = 1.5 kΩ, CL = 300 pF, RS = 5 Ω
Rev. 0
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