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AD8148 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8148
Beschreibung (AD8146 - AD8148) Triple Differential Driver
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 24 Seiten
AD8148 Datasheet, Funktion
Data Sheet
FEATURES
Triple high speed fully differential driver
700 MHz, −3 dB, 2 V p-p bandwidth (AD8146/AD8148)
600 MHz, −3 dB, 2 V p-p bandwidth (AD8147)
200 MHz, 0.1 dB, 2 V p-p bandwidth
3000 V/μs slew rate
Fixed gain (AD8146/AD8147: G = 2, AD8148: G = 4)
Differential or single-ended input to differential output
Can be used as differential-to-differential receiver
Drives one or two 100 Ω UTP cables
Adjustable output common-mode voltage (AD8146)
Internal common-mode feedback network
Output balance error −50 dB @ 50 MHz
On-chip, sync-on common-mode encoding (AD8147/AD8148)
Output pull-down feature for line isolation
Low power: 57 mA @ 5 V for 3 drivers (AD8146)
Wide supply voltage range: +5 V to ±5 V
Available in a small 4 mm × 4 mm LFCSP
APPLICATIONS
QXGA or 1080p video transmission
KVM networking
Video over unshielded twisted pair (UTP)
Differential signal multiplexing
Triple Differential Driver
for Wideband Video
AD8146/AD8147/AD8148
FUNCTIONAL BLOCK DIAGRAMS
OPD 1
VS– 2
–IN A 3
+IN A 4
VS– 5
–OUT A 6
24 23 22 21 20 19
A
78
AD8146 18 VOCMC
17 VS+
16 –IN C
15 +IN C
B
C 14 VS–
13 –OUT C
9 10 11 12
Figure 1.
OPD 1
VS– 2
–IN R 3
+IN R 4
VS– 5
–OUT R 6
24 23 22 21 20 19
AD8147/
AD8148
×2
B
AC
7 8 9 10 11 12
18 SYNC LEVEL
17 VS+ (SYNC)
16 –IN B
15 +IN B
14 VS–
13 –OUT B
GENERAL DESCRIPTION
The AD8146/AD8147/AD8148 are high speed triple, differential or
single-ended input to differential output drivers. The AD8146
and AD8147 have a fixed gain of 2, and the AD8148 has a fixed
gain of 4. They are all specifically designed for the highest
resolution component video signals but can be used for any
type of analog signals or high speed data transmission over
either Category 5 UTP cable or differential printed circuit
board (PCB) transmission lines.
These drivers can be used with the AD8145 triple differential-
to-singled-ended receiver, and the AD8117 crosspoint switch to
produce a video distribution system capable of supporting
UXGA or 1080p signals.
Manufactured on the Analog Devices, Inc. second generation
XFCB bipolar process, the drivers have large signal bandwidths
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.
Figure 2.
of 700 MHz and fast slew rates. They have an internal common-
mode feedback feature that provides output amplitude and
phase matching that is balanced to −60 dB at 50 MHz, suppressing
even-order harmonics and minimizing radiated
electromagnetic interference (EMI).
The common-mode voltage of each AD8146 output can be set
to any level, allowing transmission of signals over the common-
mode voltages. The AD8147 and AD8148 encode the vertical
and horizontal sync signals on the common-mode voltages of
the outputs. All outputs can be independently set to low voltage
states to be used with series diodes for line isolation, allowing
easy differential multiplexing over the same twisted pair cable.
The AD8146/AD8147/AD8148 are available in a 24-lead LFCSP
and operate over a temperature range of −40°C to +85°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com






AD8148 Datasheet, Funktion
AD8146/AD8147/AD8148
Data Sheet
Parameter
VOCM INPUT CHARACTERISTICS (AD8146
ONLY)
Input Voltage Range
Input Resistance
Input Offset Voltage
DC CMRR
SYNC DYNAMIC PERFORMANCE (AD8147/
AD8148 ONLY)
Slew Rate
HSYNC AND VSYNC INPUTS (AD8147/AD8148
ONLY)
Low-to-High Threshold
High-to-Low Threshold
SYNC LEVEL INPUT (AD8147/AD8148 ONLY)
Setting to 0.5 V Pulse Levels
Gain to Red Common-Mode Output
Gain to Green Common-Mode Output
Gain to Blue Common-Mode Output
POWER SUPPLY
Operating Range
Quiescent Current Positive Supply
Quiescent Current Negative Supply
PSRR
OUTPUT PULL-DOWN
OPD Input Low Voltage
OPD Input High Voltage
OPD Input Bias Current
OPD Assert Time
OPD Deassert Time
Output Voltage When OPD Asserted
Conditions
ΔVO, dm/ΔVOCM; ΔVOCM = ±1 V
VOUT, cm = −1 V to +1 V; 25% to 75%
ΔVO, cm/ΔVSYNC LEVEL, AD8147/AD8148
ΔVO, cm/ΔVSYNC LEVEL, AD8147/AD8148
ΔVO, cm/ΔVSYNC LEVEL, AD8147/AD8148
AD8146/AD8147/AD8148
Disable
AD8146
AD8147/AD8148
AD8146/AD8147/AD8148
Disabled
AD8146/AD8147/ AD8148
ΔVOUT, dm/ΔVS; ΔVS = ±1 V,
AD8146/AD8147/AD8148
Each output, OPD input @ VS+
Min Typ Max Unit
±1.2 V
12.5 kΩ
−36 +36 mV
−42 dB
800 V/µs
1.3 to 1.5
1.3 to 1.5
V
V
0.88/0.92
1.83/1.85
−1.07/−1.04
0.5
1.07/1.04
2.08/2.00
−0.88/−0.92
V
V/V
V/V
V/V
+4.5 ±5.5 V
50/55.5/ 54 mA
−50/−55/−53
4 mA
12 mA
mA
−14/−18.2/−15
mA
−70/−52/-60 dB
1.0
2.0
160
600
10
−1.6
V
V
µA
ns
ns
V
Rev. B | Page 6 of 24

6 Page









AD8148 pdf, datenblatt
AD8146/AD8147/AD8148
–20
ΔVOUT, dm/ΔVS+
–30 ΔVS = 2V p-p
–40
–50
AD8148
–60
–70 AD8147
–80
AD8146
–90
–100
0.1 1 10 100 1000
FREQUENCY (MHz)
Figure 18. Positive Power Supply Rejection vs. Frequency
1000
VS = ±5V
AD8146
100
AD8147
AD8148
10
0.01 0.1 1 10 100 1000 10000 100000
FREQUENCY (kHz)
Figure 19. Output-Referred Voltage Noise vs. Frequency
10
INPUT × 2 (VS = ±5.0V)
8
OUTPUT (VS = ±5.0V)
6
INPUT × 2 (VS = ±2.5V)
4
2
0 OUTPUT (VS = ±2.5V)
–2
–4
–6
–8
–10
0 100 200 300 400 500 600 700 800 900 1000
TIME (ns)
Figure 20. AD8146/AD8147 Output Overdrive Recovery
Data Sheet
–20
ΔVOUT, dm/ΔVS–
–30 ΔVS = 2V p-p
–40
AD8147 AD8148
–50
–60
–70
AD8146
–80
–90
–100
–110
0.1
1
10 100 1000
FREQUENCY (MHz)
Figure 21. Negative Power Supply Rejection vs. Frequency
–20
ΔVOUT, dmB/ΔVIN, dmA
–30 ΔVIN, dmA = 1V p-p
–40
–50
–60
AD8148
AD8147
–70
AD8146
–80
–90
–100
–110
–120
0.1
1
10 100 1000
FREQUENCY (MHz)
Figure 22. Amplifier-to-Amplifier Isolation vs. Frequency
10
8
6
4
2
0
–2
–4
–6
–8
–10
0
INPUT × 4 (VS = ±5.0V)
OUTPUT (VS = ±5.0V)
INPUT × 4 (VS = ±2.5V)
OUTPUT (VS = ±2.5V)
100 200 300 400 500 600 700 800 900 1000
TIME (ns)
Figure 23. AD8148 Output Overdrive Recovery
Rev. B | Page 12 of 24

12 Page





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