ADL5561ACPZ-R7 Analog Devices Inc, ADL5561ACPZ-R7 Datasheet - Page 13

• Manufacturer Part Number: ADL5561ACPZ-R7
• Description: Low Distortion 3V 41mA Diff Amp
• Manufacturer: Analog Devices Inc

Specifications of ADL5561ACPZ-R7

• Amplifier Type: RF/IF Differential
• Number Of Circuits: 1
• Output Type: Differential
• Slew Rate: 9800 V/µs
• -3db Bandwidth: 2.9GHz
• Current - Input Bias: 3µA
• Current - Supply: 40mA
• Voltage - Supply, Single/dual (±): 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-VFQFN, 16-CSP, Exposed Pad
• Voltage - Supply: 3 V ~ 3.6 V
• Frequency: 2.9GHz
• Rf Type: General Purpose
• Gain: 15.5dB
• Noise Figure: 8dB
• P1db: 19dBm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Test Frequency: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADL5561ACPZ-R7TR

CIRCUIT DESCRIPTION
BASIC STRUCTURE
The ADL5561 is a low noise, low power, fully differential amplifier/
ADC driver that uses a 3.3 V supply. It provides three gain options
(6 dB, 12 dB, and 15.5 dB) without the need for external resistors
and has wide bandwidths of 2.6 GHz for 6 dB, 2.3 GHz for 12
dB, and 2.1 GHz for 15.5 dB. Differential input impedance is
400 Ω for 6 dB, 200 Ω for 12 dB, and 133 Ω for 15.5 dB. It has a
differential output impedance of 10 Ω and an output common-
mode adjust voltage of 1.25 V to 1.85 V.
The ADL5561 is composed of a fully differential amplifier with
on-chip feedback and feed-forward resistors. The two feed-
forward resistors on each input set this pin-strappable amplifier
in three different gain configurations of 6 dB, 12 dB, and 15.5 dB.
1
1
/
/
2
2
AC
R
R
S
S
0.1µF
0.1µF
Figure 30. Basic Structure
VIP2
VIP1
VIN1
VIN2
100Ω
100Ω
200Ω
200Ω
400Ω
400Ω
5Ω
5Ω
R
L
Rev. B | Page 13 of 24
The amplifier is designed to provide high differential open-loop
gain and an output common-mode circuit that enables the user
to change the common-mode voltage from a VCOM pin. The
amplifier is designed to provide superior low distortion at
frequencies up to and beyond 300 MHz with low noise and
low power consumption. The low distortion and noise are
realized with a 3.3 V power supply at 40 mA.
The ADL5561 is very flexible in terms of I/O coupling. It can be
ac-coupled or dc-coupled at the inputs and/or the outputs within
the specified input and output common-mode levels. The input
of the device can be configured as single-ended or differential with
similar distortion performance. Due to the internal connections
between the inputs and outputs, keep the output common-mode
voltage between 1.25 V and 1.85 V for the best distortion.
For a dc-coupled input, the input common mode should be
between 1 V and 2.3 V for the best distortion. The device has
been characterized using 2 V p-p into 200 Ω. If the inputs are
ac-coupled, the input and output common-mode voltages are
set by VCC/2 when no external circuitry is used. The ADL5561
provides an output common-mode voltage set by VCOM, which
allows driving an ADC directly without external components,
such as a transformer or ac-coupling capacitors, provided that
the VCOM of the amplifier is within the VCOM of the ADC.
For dc-coupled requirements, the input VCM must be set by the
VCOM pin in all three gain settings.
ADL5561