MAX3800.pdf 데이터시트 (총 13 페이지) - 파일 다운로드 MAX3800 데이타시트 다운로드

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19-1953; Rev 3; 12/05
3.2Gbps Adaptive Equalizer
and Cable Driver
General Description
The MAX3800 is a +3.3V adaptive cable equalizer and
cable driver implemented together on a single chip. It is
designed for coaxial and twin-axial cable point-to-point
communications applications. The driver features differ-
ential current-mode logic (CML) inputs and outputs as
well as adjustable output amplitude. The equalizer
includes differential CML data inputs and outputs, a
loss-of-signal (LOS) output, and a cable integrity moni-
tor (CIM) output.
The adaptive cable equalizer is capable of equalizing
differential or single-ended signals at data rates up to
3.2Gbps. It automatically adjusts to attenuation caused
by skin-effect losses of up to 30dB at 1.6GHz. The
equalizer effectively extends the usable length of cop-
per cable in high-frequency interconnect applications.
The MAX3800 is available in a 32-pin TQFP package
with exposed pad and consumes only 200mW at
+3.3V. The driver can be disconnected from the power
supply when it is not needed, resulting in a 40% reduc-
tion in supply current.
Features
Single +3.3V Operation
Typical Power Dissipation = 200mW at +3.3V
Data Rates Up to 3.2Gbps
Adjustable Cable Driver Output Amplitude
Equalizer Automatically Adjusts for Different
Cable Lengths
0dB to 30dB Equalization at 1.6GHz (3.2Gbps)
Loss-of-Signal (LOS) Indicator
Cable Integrity Monitor (CIM)
On-Chip Input and Output Terminations
Low External Component Count
Operating Temperature Range = 0°C to +85°C
ESD Protection on Cable Inputs and Outputs
Applications
High-Speed Links in Communications
and Data Systems
Backplane and Interconnect Applications
SDH/SONET Transmission Equipment
Pin Configuration appears at end of data sheet.
Ordering Information
PART
TEMP
RANGE
MAX3800UGJ 0°C to +85°C
MAX3800UHJ 0°C to +85°C
MAX3800UHJ+ 0°C to +85°C
*EP = exposed pad
+Denotes lead-free package.
PIN-
PACKAGE
32 QFN
32 TQFP-EP*
32 TQFP-EP*
PKG
CODE
G3255-1
AA-EP
AA-EP
+3.3V
DIN DOUT
MAX3800
EOUT
LOS
RMOD
EIN
CIM
Typical Application Circuit
+3.3V
EIN EOUT
MAX3800
DOUT
LOS
RMOD
DIN
CIM
THIS SYMBOL INDICATES A CONTROLLED-IMPEDANCE TRANSMISSION LINE.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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3.2Gbps Adaptive Equalizer
and Cable Driver
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC..............................................-0.5V to +6.0V
Voltage at LOS, RMOD, and CIM...............-0.5V to (VCC + 0.5V)
Voltage at EIN+, EIN-, DIN+, DIN- .....(VCC - 1V) to (VCC + 0.5V)
Current Out of EOUT+, EOUT-, DOUT+, DOUT- ................25mA
Continuous Power Dissipation (TA = +85°C)
32-Pin TQFP-EP (derate 22.2mW/°C above +85°C) ...1444mW
Operating Ambient Temperature Range ................0°C to +85°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = +3.14V to +3.46V, TA = 0°C to +85°C. Typical values are at VCC = +3.3V and TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Supply Current
ICC
CABLE DRIVER INPUT SPECIFICATIONS
Includes external load current (Note 1)
MIN TYP MAX UNITS
65 85 mA
Input Voltage (Single-Ended)
VDIN+,
VDIN-
Input Voltage (Differential)
Input Impedance
VDIN
VDIN = (VDIN+) - (VDIN-)
Single-ended
CABLE DRIVER OUTPUT SPECIFICATIONS
Output Voltage
(Differential)
Output Impedance
RMOD = 10k(Note 2)
RMOD = 20k(Note 2)
Single-ended
CABLE EQUALIZER INPUT SPECIFICATIONS
Minimum Cable Input (Differential)
3.2Gbps, 30dB cable loss at 1.6GHz (Note 3)
Maximum Cable Input (Differential)
Input Impedance
Single-ended
CABLE EQUALIZER OUTPUT SPECIFICATIONS
Output Voltage (Differential)
(Note 2)
Output Impedance
Single-ended
Voltage at CIM Output (Differential)
VCIM No external load, VCIM = (VCIM+) - (VCIM-)
Voltage at CIM Output
(Single-Ended)
VCIM+,
VCIM-
No external load
Voltage at LOS
Output high (Note 4)
Output low (Note 4)
Output Common-Mode Voltage
Each output DC-coupled 50to VCC
VCC
- 0.6
VCC
+ 0.2
V
400 1100 mVp-p
45 55 65
750 870 1000 mVp-p
400 450 550 mVp-p
50 62.5 75
650 700 mVp-p
1100
mVp-p
45 55 65
500 1000
50 62.5 75
-0.5 +0.5
0.5
VCC
- 0.5
2.4
0.4
VCC - 0.2
mVp-p
Vp-p
V
V
V
V
2 _______________________________________________________________________________________

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3.2Gbps Adaptive Equalizer
and Cable Driver
AC ELECTRICAL CHARACTERISTICS
(VCC = +3.14V to +3.46V, TA = 0°C to +85°C. Typical values are at VCC = +3.3V and TA = +25°C, unless otherwise noted.) (Note 5)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Maximum Input Data Rate
3.2 Gbps
CABLE DRIVER SPECIFICATIONS
Random Jitter
Deterministic Jitter
(Note 6)
(Note 6)
2 4 mUIRMS
20 60 mUIp-p
Output Edge Speed
20% to 80%
59 76 ps
Input Return Loss (Single-Ended)
3.2GHz
14 dB
Output Return Loss (Single-Ended)
3.2GHz
14 dB
EQUALIZER SPECIFICATIONS
0dB cable loss (Note 8)
170 240 mUIp-p
Residual Jitter (Note 7)
24dB cable loss (Note 8)
97 200 mUIp-p
30dB cable loss (Note 8)
112 200 mUIp-p
Output Edge Speed
20% to 80%
56 77 ps
Input Return Loss (Single-Ended)
3.2GHz
14 dB
Output Return Loss (Single-Ended)
3.2GHz
14 dB
Equalization Compensation
1.6GHz (skin-effect losses only)
30
dB
Equalization Time Constant
5 µs
Note 1: Equalizer and driver total currents (equalizer with maximum equalization and driver with maximum output swing).
Note 2: Input voltage within specification limits, 50to VCC at each output.
Note 3: Minimum cable input for LOS to assert high.
Note 4: 100kload to ground.
Note 5: AC electrical characteristics are guaranteed by design and characterization.
Note 6: VDIN = 400mVp-p to 1100mVp-p (differential), 10kΩ ≤ RMOD 20k, 3.2Gbps 213-1 PRBS with 100 consecutive ones and
100 consecutive zeros substituted.
Note 7: Includes random jitter and deterministic jitter.
Note 8: Differential cable input voltage = 700mVp-p, 3.2Gbps 213-1 PRBS with 100 consecutive ones and 100 consecutive zeros
substituted. Cable loss is due to skin effect only.
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3.2Gbps Adaptive Equalizer
and Cable Driver
Typical Operating Characteristics
(TA = +25°C, VCC = +3.3V, all jitter measurements done at 3.2Gbps, 700mV cable input with 213-1 PRBS pattern with 100 consecutive
ones and 100 consecutive zeros substituted. Note: Test pattern produces near worst-case jitter results. Results will vary with pattern,
unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
70
DRIVER + EQUALIZER
65
60
55
50
45
40 EQUALIZER
35
30 DRIVER
25
CABLE DRIVER OUTPUT VOLTAGE vs. RMOD
1300
1200
1100
1000
900
800
700
600
500
DRIVER INPUT RETURN LOSS (S11)
50
40
30
20
10
0
-10
-20
-30
-40
20
0
10 20 30 40 50 60 70 80 90
TEMPERATURE (°C)
400
4
7 10 13 16 19 22
RMOD (k)
-50
0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
FREQUENCY (GHz)
DRIVER OUTPUT RETURN LOSS (S22)
50
40
30
20
10
0
-10
-20
-30
-40
-50
0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
FREQUENCY (GHz)
EQUALIZER RESIDUAL JITTER vs. POWER SUPPLY
NOISE (100mVp-p SINE WAVE) (40FT OF MADISON
#14887 SHIELDED TWISTED PAIR-DIFFERENTIAL)
55
50
45
40
35
30
0.001
0.01 0.1 1 10
NOISE FREQUENCY (MHz)
100
EQUALIZER RESIDUAL JITTER vs. CABLE
INPUT AMPLITUDE (RG179B 75
COAXIAL CABLE - SINGLE-ENDED)
140
130
120 25 FT
110
100
72 FT
90
80
70
300 400 500 600 700 800 900 1000 1100
CABLE INPUT AMPLITUDE (mV)
EQUALIZER RESIDUAL JITTER vs.
CABLE LENGTH (MADISON #13887 SHIELDED
TWISTED PAIR-DIFFERENTIAL)
100
EQUALIZER RESIDUAL JITTER vs.
CABLE LENGTH (RG179B 75COAXIAL
CABLE - SINGLE-ENDED)
160
EQUALIZER RESIDUAL JITTER vs. LINE LENGTH
(FR-4 6MIL STRIPLINE - SINGLE-ENDED)
110
90
80
70
60
50
40
30
20
10
3.05
2.5Gbps
3.2Gbps
622Mbps
140
120 3.2Gbps
100
80
2.5Gbps
100
90
80 622Mbps
70
2.5Gbps
3.2Gbps
60
20 30 40
6.1 9.14 12.19
CABLE LENGTH
60 50
622Mbps
40
50 (FEET)
25 35 45 55 65 75 85 95 (FEET)
40
40 45 50 55 60 65 70 75 80 85 (INCHES)
15.24 (METERS) 7.65 10.67 13.72 16.76 19.81 22.86 25.91 28.96 (METERS) 1.02 1.14 1.27 1.40 1.52 1.65 1.77 1.90 2.03 2.16 (METERS)
CABLE LENGTH
LINE LENGTH
4 _______________________________________________________________________________________

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3.2Gbps Adaptive Equalizer
and Cable Driver
Typical Operating Characteristics (continued)
(TA = +25°C, VCC = +3.3V, all jitter measurements done at 3.2Gbps, 700mV cable input with 213-1 PRBS pattern with 100 consecutive
ones and 100 consecutive zeros substituted. Note: Test pattern produces near worst-case jitter results. Results will vary with pattern,
unless otherwise noted.)
EQUALIZER INPUT AFTER
115FT OF CABLE (TOP)
EQUALIZER OUTPUT (BOTTOM)
EQUALIZER OUTPUT EYE DIAGRAM
AFTER 115FT OF 50GORE 89 CABLE
(DIFFERENTIAL, 27-1 PRBS)
EQUALIZER OUTPUT EYE DIAGRAM
AFTER 100FT OF 75RG179 CABLE
(SINGLE-ENDED, 27-1 PRBS)
EQUALIZER OUTPUT EYE DIAGRAM
AFTER 100FT OF BELDEN 9207 CABLE
(DIFFERENTIAL, 27-1 PRBS)
60ps/div (2.5Gbps)
EQUALIZER OUTPUT EYE DIAGRAM
AFTER 50FT OF MADISON #14887
SHIELDED TWISTED PAIR CABLE
(DIFFERENTIAL, 27-1 PRBS)
68ps/div (2.5Gbps)
CIM VOLTAGE vs. CABLE LENGTH
(RG179B 75COAXIAL CABLE -
SINGLE-ENDED)
1.8
1.7 CIM-
1.6
1.5
1.4
1.3 CIM+
60ps/div (2.5Gbps)
60ps/div (2.5Gbps)
1.2
0 10 20 30 40 50 60 70 80 90 100
CABLE LENGTH (FEET)
EQUALIZER INPUT RETURN LOSS (S11)
50
40
30
20
10
0
-10
-20
-30
-40
-50
0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
FREQUENCY (GHz)
EQUALIZER OUTPUT RETURN LOSS (S22)
50
40
30
20
10
0
-10
-20
-30
-40
-50
0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
FREQUENCY (GHz)
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