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PDF AD8260 Data sheet ( Hoja de datos )
| Número de pieza | AD8260 | |
| Descripción | High Current Driver Amplifier and Digital VGA/Preamplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
High Current Driver Amplifier and
Digital VGA/Preamplifier with 3 dB Steps
AD8260
FEATURES
High current driver
Differential input—direct drive from DAC
Preset gain: 1.5×
−3 dB bandwidth: 195 MHz
Large output drive: >±300 mA
VGA/preamplifier
Low noise
Voltage noise: 2.4 nV/√Hz
Current noise: 5 pA/√Hz
−3 dB bandwidth: 230 MHz
Gain range: 30 dB in 3 dB steps
−6 dB to +24 dB (for preamplifier gain of 6 dB)
Single-ended preamplifier input and differential VGA
output
Supplies: 3.3 V to 10 V (with VMID enabled)
±3.3 V to ±5 V (with VMID disabled)
Power: 93 mW with 3.3 V supplies
Power-down for VGA, driver amplifier, and system
APPLICATIONS
Digital AGC systems
Tx/Rx signal processing
Power line transceivers
GENERAL DESCRIPTION
The AD8260 includes a high current driver, usable as a
transmitter, and a low noise digitally programmable variable
gain amplifier (DGA), useable as a receiver.
The receiver section consists of a single-ended input preampli-
fier, and linear-in-dB, differential-output DGA. The receiver has
a small signal –3 dB bandwidth of 230 MHz; the driver small
signal bandwidth is 195 MHz. The driver delivers ±300 mA,
well suited for driving low impedance loads, even when
connected to a 3.3 V supply.
The AD8260 DGA is ideal for trim applications and has a gain
span of 30 dB, in 3 dB steps. Excellent bandwidth uniformity is
maintained across the entire frequency range. The low output-
referred noise of the DGA is advantageous in driving high
speed ADCs. The differential output facilitates the interface to
modern low voltage high speed ADCs.
Single-supply and dual-supply operation makes the part versatile
and enables gain control of negative-going pulses, such as those
generated by photodiodes or photo-multiplier tubes, as well as
processing band-pass signals on a single supply. For maximum
FUNCTIONAL BLOCK DIAGRAM
VOCM INPP INRP INRN INPN TXFB VNEG VNEG
32 31 30 29 28 27 26 25
1.5kΩ 1kΩ
1kΩ 1.5kΩ
VMDO 1
TXEN 2
VMDI 3
VNCM 4
VPSB 5
ENBL 6
VGAP 7
VGAN 8
VMID
+–
GM
×1
HIGH CURRENT DRIVER
AD8260
BIAS
VGA/PREAMPLIFIER
ATTENUATOR
GM STAGES
LOGIC
24 TXOP
23 TXOP
22 VPOS
21 VPOS
20 VPSR
19 VMDO
18 PRAI
17 FDBK
9 10 11 12 13 14 15 16
VNGR VPSR GNS3 GNS2 GNS1 GNS0 PRAO VNGR
Figure 1. Functional Block Diagram
dynamic range, it is essential that the part be ac-coupled when
operating on a single supply.
The AD8260 preamplifier (PrA) is configured with external
resistors for gains greater than 6 dB and can be inverting or
noninverting. The DGA is characterized with a noninverting
preamplifier gain of 2×. The attenuator has a range of 30 dB and
the output amplifier has a gain of 8× (18.06 dB). The lowest
noninverting gain range is −6 dB to +24 dB and shifts up with
increased preamplifier gain. The gain is controlled via a parallel
port (Pin GNS0 to Pin GNS3) with 10 gain steps of 3 dB per
code. The preamplifier and DGA are disabled for any code that
is not assigned a gain step.
The AD8260 can operate with single or dual supplies from 3.3 V
to ±5 V. An internal buffer normally provides a split supply
reference for single-supply operation; an external reference can
also be used when the VMID buffer is shut down.
The operating temperature range is −40°C to +105°C. The
AD8260 is available in a 5 mm × 5 mm, 32-lead LFCSP.
Rev. B
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2008–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD8260
Parameter
Output Third-Order Intercept, RLOAD = 50 Ω
PREAMPLFIER AND VGA—GENERAL PARAMETERS
−3 dB Small Signal Bandwidth
−3 dB Large Signal Bandwidth
Slew Rate
Input Voltage Noise
Noise Figure
Output-Referred Noise
Output Impedance
Output Signal Range (per Pin)
Input Signal Range
Output Offset Voltage
PREAMPLIFIER AND VGA—DYNAMIC PERFORMANCE
Harmonic Distortion
HD2
HD3
HD2
HD3
Harmonic Distortion
HD2
HD3
HD2
HD3
Input 1 dB Compression Point
MTPR (In-Band)
Two-Tone Intermodulation Distortion (IMD3)
Output Third-Order Intercept
Data Sheet
Test Conditions/Comments
VOUT = 1 V p-p, f = 10 MHz
VOUT = 2 V p-p, f = 10 MHz
VOUT = 1 V p-p, f = 45 MHz
VOUT = 2 V p-p, f = 45 MHz
Min Typ
33
40
23
28
Max Unit
dBm
dBm
dBm
dBm
VOUT = 10 mV p-p, gain code = 0110
VOUT = 1 V p-p, gain code = 0110
VOUT = 2 V p-p, gain code = 0110
VOUT = 1 V p-p, gain code = 0110
VOUT = 1.6 V p-p, gain code = 0110
f = 10 MHz (shorted input)
f = 10 MHz (input open)
Maximum gain (gain code = 1011), RS = 50 Ω,
unterminated
Maximum gain (gain code = 1011), RS = 50 Ω,
shunt terminated with 50 Ω
Maximum gain (gain code = 1011), gain = 24 dB (input
short)
Maximum gain (gain code = 1011), gain = 24 dB (input
open)
Minimum gain (gain code = 0001), gain = −6 dB
DC to 10 MHz
RLOAD ≥ 500 Ω
VS = +5 V
VS = ±5 V
Preamplifier input
Maximum gain (gain code = 1011), gain = 24 dB, 3 σ
limits
230
165
135
330
335
2.4
6.2
10.2
15.5
38
98.1
25
≤3
VMDO ± 0.7
VMDO ± 1.4
±3.6
VMDO ± 0.3
−50 ±20
MHz
MHz
MHz
V/µs
V/µs
nV/√Hz
nV/√Hz
dB
dB
nV/√Hz
nV/√Hz
nV/√Hz
Ω
V
V
V
V
+50 mV
Gain code = 0110, gain = 9 dB, VOUT = 1 V p-p
f = 1 MHz
f = 10 MHz
Gain code = 1011, gain = 24 dB, VOUT = 2 V p-p
f = 1 MHz
f = 10 MHz
Minimum gain (gain code = 0001), gain = −6 dB
(preamplifier limited)
Maximum gain (gain code = 1011), gain = 24 dB
(VGA limited)
VOUT = 1.4 V p-p maximum, 10 tones, 2 MHz to 22 MHz
with missing tone at 12 MHz (spacing 2 MHz), gain
code = 1011, gain = 24 dB
VOUT = 1.4 V p-p maximum, 16 tones, 2 MHz to 38 MHz
with missing tones at 10 MHz, 20 MHz, 30 MHz, and
40 MHz (spacing 2 MHz)
Gain code = 1011, gain = 24 dB
VOUT = 1 V p-p, f1 = 10 MHz, f2 = 11 MHz
VOUT = 2 V p-p, f1 = 10 MHz, f2 = 11 MHz
VOUT = 1 V p-p, f1 = 45 MHz, f2 = 46 MHz
VOUT = 2 V p-p, f1 = 45 MHz, f2 = 46 MHz
Gain code = 1011, gain = 24 dB
VOUT = 1 V p-p, f = 10 MHz
VOUT = 2 V p-p, f = 10 MHz
VOUT = 1 V p-p, f = 45 MHz
VOUT = 2 V p-p, f = 45 MHz
−90
−87
−75
−58
−94
−90
−61
−84
1.9
−9.2
−68
−61
−92
−77
−50
−36
44
43
27
22
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBm
dBm
dBc
dBc
dBc
dBc
dBc
dBc
dBm
dBm
dBm
dBm
Rev. B | Page 4 of 32
5 Page 
AD8260
0
–10
–20
–30
–40
–50
–60
–70
–80
–90 0
24
6 8 10 12 14 16 18 20 22 24
FREQUENCY (MHz)
Figure 15. Missing Tone Power Ratio for the High Current Driver
0.20
0.15
CLOAD = 5pF
NONINVERTING
0.10
0 .05
0
–0.05
–0.10
–0.15
RLOAD = 10Ω
RLOAD = 50Ω
RLOAD = 100Ω
RLOAD = 500Ω
–0.20
–30 –20 –10 0 10 20 30 40 50 60 70 80
TIME (ns)
Figure 16. Small-Signal Pulse Response of the High Current Driver for Various
Values of Load Resistance, RLOAD—See Figure 56
0.20
0.15
0.10
CLOAD = 5pF
CLOAD = 10pF
CLOAD = 47pF
0.05
0
–0.05
–0.10
–0.15
RLOAD = 500Ω
NONINVERTING
–0.20
–30 –20 –10 0 10 20 30 40 50 60 70 80
TIME (ns)
Figure 17. Small-Signal Pulse Response of the High Current Driver for Various
Values of Load Capacitance, CLOAD, and RLOAD = 500 Ω—See Figure 56
Data Sheet
0.20
0.15
0.10
CLOAD = 5pF
CLOAD = 10pF
CLOAD = 47pF
0.05
0
–0.05
–0.10
–0.15
RLOAD = 50Ω
NONINVERTING
–0.20
–30 –20 –10 0 10 20 30 40 50 60 70 80
TIME (ns)
Figure 18. Small-Signal Pulse Response of the High Current Driver for Various
Values of Load Capacitance, CLOAD, and 50 Ω Load—See Figure 56
2.0
CLOAD = 5pF
NONINVERTING
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
30 20 10 0
RLOAD = 10Ω
RLOAD = 50Ω
RLOAD = 100Ω
RLOAD = 500Ω
10 20 30 40 50 60 70 80
TIME (ns)
Figure 19. Large-Signal Pulse Response of the High Current Driver for Various
Values of Load Resistance, RLOAD—See Figure 56
2.0
CLOAD = 5pF
1.5 CLOAD = 10pF
CLOAD = 47pF
1.0
0.5
0
–0.5
–1.0
–1.5
RLOAD = 500Ω
NONINVERTING
–2.0
–30 –20 –10 0 10 20 30 40 50 60 70 80
TIME (ns)
Figure 20. Large-Signal Pulse Response of the High Current Driver for Various
Values of Load Capacitance, CLOAD, and RLOAD = 500 Ω—See Figure 56
Rev. B | Page 10 of 32
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AD8260.PDF ] | |
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