AD8129-EVAL Analog Devices, AD8129-EVAL Datasheet

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AD8129-EVAL

Manufacturer Part Number
AD8129-EVAL
Description
Low-cost 270 MHz differential receiver amplifier
Manufacturer
Analog Devices
Datasheet
a
GENERAL DESCRIPTION
The AD8129 and AD8130 are designed as receivers for the
transmission of high-speed signals over twisted-pair cables to
work with the AD8131 or AD8132 drivers. Either can be
used for analog or digital video signals and for high-speed
120
110
100
90
80
70
60
50
40
30
10k
100k
√Hz
√Hz
FREQUENCY – Hz
1M
10M
100M
Differential Receiver Amplifiers
data transmission. The AD8129 and AD8130 are differential-
to-single-ended amplifiers with extremely high CMRR at high
frequency. Therefore, they can also be effectively used as
high-speed instrumentation amps or for converting differential
signals to single-ended signals.
The AD8129 is a low-noise high-gain (10 or greater) version
intended for applications over very long cables where signal
attenuation is significant. The AD8130 is stable at a gain of one
and can be used for those applications where lower gains are
required. Both have user adjustable gain to help compensate for
losses in the transmission line. The gain is set by the ratio of
two resistor values. The AD8129 and AD8130 have very high
input impedance on both inputs regardless of the gain setting.
The AD8129 and AD8130 have excellent common-mode rejec-
tion (70 dB @ 10 MHz) allowing the use of low cost unshielded
twisted-pair cables without fear of corruption by external noise
sources or crosstalk.
The AD8129 and AD8130 have a wide power supply range
from single 5 V supply to ± 12 V, allowing wide common-mode
and differential-mode voltage ranges while maintaining signal
integrity. The wide common-mode voltage range will enable
the driver receiver pair to operate without isolation transform-
ers in many systems where the ground potential difference
between drive and receive locations is many volts. The AD8129
and AD8130 have considerable cost and performance improve-
ments over op amps and other multi-amplifier receiving solutions.
V
SO-8 (R) and Micro_SO-8 (RM)
IN
V
R
OUT
CONNECTION DIAGRAM
G
REF
–V
+IN
= V
PD
S
IN
1
2
3
4
[1+(R
PD
(Top View)
Low-Cost 270 MHz
AD8129/AD8130
R
AD8129/
AD8130
F
F
+
/R
G
+V
–V
)]
S
S
8
7
6
5
–IN
+V
OUT
FB
S
V
OUT

Related parts for AD8129-EVAL

AD8129-EVAL Summary of contents

Page 1

... GENERAL DESCRIPTION The AD8129 and AD8130 are designed as receivers for the transmission of high-speed signals over twisted-pair cables to work with the AD8131 or AD8132 drivers. Either can be used for analog or digital video signals and for high-speed 120 110 100 ...

Page 2

... AD8129/AD8130–SPECIFICATIONS 5 V SPECIFICATIONS (AD8129 G = 10, AD8130 otherwise noted – +85 C, unless otherwise noted.) MIN MAX Model Parameter Conditions DYNAMIC PERFORMANCE ≤ 0.3 V p-p –3 dB Bandwidth V OUT p-p OUT ≤ 0.3 V p-p, SOIC/µSOIC Bandwidth for 0.1 dB Flatness V OUT Slew Rate p-p, 25% to 75% ...

Page 3

... V SPECIFICATIONS (AD8129 G = 10, AD8130 unless otherwise noted – +85 C, unless otherwise noted.) MIN MAX Model Parameter Conditions DYNAMIC PERFORMANCE ≤ 0.3 V p-p –3 dB Bandwidth V OUT p-p OUT ≤ 0.3 V p-p, SOIC/µSOIC Bandwidth for 0.1 dB Flatness V OUT Slew Rate p-p, 25% to 75% ...

Page 4

... AD8129/AD8130–SPECIFICATIONS 5 V SPECIFICATIONS (AD8129 G = 10, AD8130 unless otherwise noted – +85 C, unless otherwise noted.) MIN MAX Model Parameter Conditions DYNAMIC PERFORMANCE ≤ 0.3 V p-p –3 dB Bandwidth V OUT p-p OUT ≤ 0.3 V p-p, SOIC/µSOIC Bandwidth for 0.1 dB Flatness V OUT Slew Rate p-p, 25% to 75% ...

Page 5

... AD8129AR-REEL7 –40ºC to +85ºC AD8129ARM –40ºC to +85ºC 3 AD8129ARM-REEL –40ºC to +85ºC 2 AD8129ARM-REEL7 –40ºC to +85ºC AD8129-EVAL AD8130AR –40ºC to +85ºC 1 AD8130AR-REEL –40ºC to +85ºC 2 AD8130AR-REEL7 –40ºC to +85ºC AD8130ARM –40ºC to +85ºC ...

Page 6

... AD8129/AD8130 AD8130 Frequency Response Characteristics ( pF 0 OUT 2. 0.3V p-p S OUT – 12V S –2 –3 –4 –5 –6 – 100 400 FREQUENCY – MHz 20pF 10pF 5pF ...

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... S –0 –0.6 –0.7 0 FREQUENCY – MHz 12 0dB = 1V RMS 6 0 –6 –12 –18 –24 –30 –36 – –48 10 100 400 FREQUENCY – MHz AD8129/AD8130 0 0 150 2.5V S 0.1 0 –0 –0 12V S –0.3 –0.4 –0.5 –0.6 –0 100 FREQUENCY – ...

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... AD8129/AD8130 AD8129 Frequency Response Characteristics ( 0 OUT 0.3V p-p OUT 2. – 12V S –2 –3 –4 –5 –6 – 100 300 FREQUENCY – MHz 20pF 10pF 5pF ...

Page 9

... S –0.7 –0.8 0 FREQUENCY – MHz 12 0dB = 1V RMS 6 0 –6 –12 –18 –24 –30 –36 – –48 10 100 400 FREQUENCY – MHz AD8129/AD8130 0 0 150 L 0 5V, 12V S 0 –0.1 –0.2 –0.3 –0 2.5V S –0.5 –0.6 –0.7 0 FREQUENCY – MHz ...

Page 10

... AD8129/AD8130 AD8130 Harmonic Distortion Characteristics ( pF unless otherwise noted – p-p OUT – 12V S –72 – 12V – – FREQUENCY – MHz – p OUT – 12V S –63 – ...

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... AD8129 Harmonic Distortion Characteristics ( pF unless otherwise noted – p-p OUT –57 – 10 12V S – 10 – 20 12V S – 20 – FREQUENCY – MHz – p-p OUT G = 10, – 10, – ...

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... L – 5MHz C –50 2.5V 12V –56 5V – 2.5V S –68 HD3 V – –80 100 1k R – L 100 10 1.0 10M 10 100 1k 10k 100k FREQUENCY – p-p OUT HD2 = 5V, 12V S 12V p-p OUT 12V 12V S 1k AD8130 AD8129 1M 10M ...

Page 13

... FREQUENCY – –10 –20 –30 –40 –50 –60 – – 12V S – 2.5V S –100 1k 10k 100k 1M 10M 100M FREQUENCY – Hz 100 AD8130 100m 10m AD8129 10k 100k 1M 10M 100M FREQUENCY – Hz ...

Page 14

... AD8129/AD8130 AD8130 Transient Response Characteristics ( pF p-p OUT V = 2.5V S 5.00ns 250mV ± 2. 0.2V p-p OUT 12V S 50mV 5.00ns C = 10pF V = 0.2V L OUT p 5pF 2pF L 10.0ns 50mV = 25 C, unless otherwise noted p-p OUT 250mV 5.00ns ± ...

Page 15

... OUT 12V S 5.00ns 500mV V OUT V IN 1.00V 5.00ns p OUT 10pF L 2.00V 10.0ns ± AD8129/AD8130 p-p OUT 10pF 2pF L 5.00ns 2.00V 10V p 12V OUT S 2.50V 5.00ns ± 20V p-p OUT ...

Page 16

... AD8129/AD8130 AD8129 Transient Response Characteristics ( 221 , 2. p-p OUT S 5.00ns 250mV ± 0.4V p-p S OUT 12V S 100mV 5.00ns C = 5pF V = 0.4V p-p L OUT C = 10pF 2pF L 100mV 5.00ns = 1 pF unless otherwise noted ...

Page 17

... p OUT C = 20pF L 500mV 5.00ns ± V OUT p OUT 20pF L 12.5ns 2.00V ± AD8129/AD8130 p OUT C = 20pF L 5.00ns 2.00V ± 10V p OUT V = 12V 20pF L 2.50V 5.00ns V = 20V p OUT V = 12V S ...

Page 18

... –5 –4 –3 –2 – OUTPUT VOLTAGE – V 3.0 AD8130 2 100mV AC @ 1kHz OUT 1.0 AD8129 0.0 –1.0 AD8130 –2.0 –3.0 –50 –35 –20 – 100 TEMPERATURE – –1 –2 –3 –4 –5 –4 – ...

Page 19

... 0.30 20 0.15 10 –50 –35 –20 – 100 TEMPERATURE – C 11.0 10.5 AD8130 10 12V S 9.5 AD8129 9 100mV 8.5 OUT AC AT 1kHz –9.0 –9.5 AD8129 AD8130 –10.0 –10.5 –11.0 –50 –35 –20 – 100 TEMPERATURE – 12V +100 C – ...

Page 20

... A few simple circuits can illustrate how the active feedback architecture of the AD8129/AD8130 operates. Op Amp Configuration If only one of the input stages of the AD8129/AD8130 is used, it will function very much like a conventional op amp. (See Figure 4.) Classical inverting and noninverting op amps circuits can be created, and the basic governing equations will be the same as for a conventional op amp ...

Page 21

... APPLICATIONS Basic Gain Circuits The gain of the AD8129/AD8130 can be set with a pair of feed- back resistors. The basic configuration is shown in Figure 5. The gain equation is the same as that of a conventional op amp For unity gain applications using the AD8130 can be set to zero (short circuit), and R F (See Figure 6 ...

Page 22

... AD8129/AD8130 –10 –20 –30 –40 –50 –60 –70 –80 10k 100k 1M FREQUENCY – Hz The feedback network is between Pins 6 and 5 and from Pin 5 to ground. C1 and R create a corner frequency of about 800 kHz. F The gain increases to provide about boost at 8 MHz. ...

Page 23

... REF pin is grounded. The negative differential input is connected directly to the shield of the cable (or an associated connector) at the point at which it wants to be “tapped.” 0 OUT VIDEO AD8129/AD8130 +V AD8130 0 ...

Page 24

... IN 1N4148 the S Another problem can occur with the AD8129 operating at supply is higher S voltage of greater than or equal to ± The architecture causes the supply current to increase as the input differential voltage increases. If the AD8129 differential inputs are over- driven too far, excessive current can flow in the device and potentially cause permanent damage ...

Page 25

... PCB design practice. The first requirement is for a good solid ground plane that cov- ers as much of the board area around the AD8129/AD8130 as possible. The only exception to this is that the ground plane around the FB pin should be kept a few mm away, and ground should be removed from inner layers and the opposite side of the board under this pin ...

Page 26

... AD8129/AD8130 0.0098 (0.25) 0.0040 (0.10) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead SOIC (SO-8) 0.1968 (5.00) 0.1890 (4.80 0.2440 (6.20) 0.1574 (4.00) 0.2284 (5.80) 0.1497 (3.80 PIN 1 0.0500 (1.27) BSC 0.0688 (1.75) 0.0532 (1.35) 8 0.0192 (0.49) 0 0.0098 (0.25) SEATING 0.0138 (0.35) PLANE 0.0075 (0.19) 8-Lead Micro_SO (RM-8) 0.122 (3.10) 0.114 (2.90 0.122 (3.10) 0.199 (5.05) 0.114 (2.90) 0.187 (4.75 PIN 1 ...

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