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Part: MAX3825
Category:
Communication
-> Network
-> SONET/SDH/ATM/DS3/PHYs/E3 (T3/E3)
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Description: +3.3V, 2.5Gbps, Quad, Transimpedance Amplifier For System Interconnects
Company: Maxim Integrated Products
Datasheet: Download MAX3825 datasheet File size : 711 kB
Request For quote: Find where to buy MAX3825
Datasheet text preview:
19-1855 Rev 0; 11/00
+3.3V, 2.5Gbps Quad Transimpedance Amplifier for System Interconnects
General Description
The MAX3825 is a quad transimpedance amplifier (TIA) intended for 2.5Gbps system interconnect applications. Each of the four channels converts a small photodiode current to a measurable differential voltage with a trans i m p e d a n c e gain of 3.7k. The circuit features 460nARMS of input-referred noise per channel corresponding to an optical input sensitivity of -22.3dBm (BER 1 × 10-14). The quad transimpedance amplifier has 20ps of deterministic jitter and a 2.4GHz small-signal bandwidth. The MAX3825 is optimized for use with a quad PIN photodetector array with a standard fiber pitch of 250µm. T h e MAX3825 operates from a single +3.3V supply over a 0°C to +85°C temperature range. With a +3.3V supply, each channel dissipates 93mW of power. A DC cancellation circuit on each channel provides a true differential output swing over a wide range of input currents. Each channel has an independent supply and ground to allow all or any combination of channels to be connected. This device is available in dice only.
Typical Operating Circuit appears at end of data sheet.
Features
o o o o o o o o o Single +3.3V Supply 93mW per Channel Power Dissipation 460nARMS Input-Referred Noise 20ps Deterministic Jitter 2.4GHz Small-Signal Bandwidth No External Compensation 40dB Power-Supply Rejection Ratio Compact Die with 250µm Channel Pitch 100 Differential Output Impedance
MAX3825
Ordering Information
PART MAX3825U/D TEMP. RANGE 0°C to +85°C PIN-PACKAGE Dice*
*Dice are designed to operate with a 0°C to +120°C junction temperature, but are tested and guaranteed only at TA = +25°C.
Applications
System Interconnects SDH/SONET Backplanes Dense Digital CrossConnects ATM Switching Networks High-Speed Parallel Optical Links
Chip Topography/Pad Configuration
VCCO1 OUT1+ OUT1- VCCO1 VCCO2 OUT2+ OUT2- VCCO2 VCCO3 OUT3+ OUT3- VCCO3 VCCO4 OUT4+ OUT4-VCCO4 N.C.
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
GNDO1
37
20
GNDO4
GNDO2 GNDF
38 39
19 18 17 16 15 14
GNDO3 ENABLE
GNDI2 VCCI2 VCCI1 GNDI1 VCCFILT
40 41 42 43 44 1 N.C. 2 3 4 IN1 5 6 7 8 9 10 11 12 N.C. 13 N.C.
GNDI3 VCCI3 VCCI4 GNDI4
N.C. FILTER
FILT1 IN2 FILT2 IN3 FILT3 IN4 FILT4
________________________________________________________________ Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
+3.3V, 2.5Gbps Quad Transimpedance Amplifier for System Interconnects MAX3825
ABSOLUTE MAXIMUM RATINGS
Supply Voltage VCCO1, VCCO2, VCCO3, VCCO4, VCCI1, VCCI2, VCCI3, VCCI4, VCCFILT ......-0.5V to +6.0V Input Current: IN1, IN2, IN3, IN4...-4mA to +4mA FILTER Current........-24mA to +24mA Filter Current: FILT1, FILT2, FILT3, FILT4 ....-6mA to +6mA Output Voltage OUT1±, OUT2±, OUT3±, OUT4±....(VCC - 1.5V) to (VCC + 0.5V) ENABLE Voltage........-0.5V to (VCC + 0.5V) Operating Temperature Range (TA)......0°C to +85°C Storage Temperature Range .....-55°C to +150°C Operating Junction Temperature (TJ).......-55°C to +150°C Processing Temperature........+400°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 +3.6V, TA = 0°C to +85°C. Typical values are at +3.3V, TA = +25°C, unless otherwise noted.) MIN TYP PARAMETER SYMBOL CONDITIONS
Single channel Supply Current Input Bias Voltage DC Input Overload Transimpedance Filter Resistor RFILTER Filter Resistors RFILT14 Single-Ended Output Impedance Transimpedance Linear Range Maximum Differential Output Range Output Offset Voltage Output Common Mode Voltage V offset Z21 R FILTER RFILT_ RO (Note 1) IIN = 2mAp-p IIN = 10µAp-p 50 loads to VCC 43 50 230 -5 VCC - 0.09 340 480 +5 10µAp-p, 100 differential load ICC Dual channel Quad channel IIN = 0 1.7 3.0 3.7 180 720 50 57 4.5 28 56 112 0.89 MAX 40 80 160 0.99 mA V mA k µAp-p mVp-p mV V UNITS
Note 1: Gain at 50µAp-p is within 10% of the small signal gain.
AC ELECTRICAL CHARACTERISTICS
(VCC = +3.14V to +3.6V, TA = 0°C to +85°C. Typical values are at +3.3V, TA = +25°C, unless otherwise noted. Total source capacitance = 0.7pF.) (Note 2)
PARAMETER AC Input Overload Input Referred Noise Low-Frequency Cutoff Deterministic Jitter (Note 5) Power-Supply Rejection Ratio Small-Signal Bandwidth Maximum Skew (Note 7) DJ PSRR BW Any two channels within a chip IN (Note 4) IIN > 100µAp-p (Note 6) SYMBOL (Note 3) CONDITIONS MIN 2 460 60 20 40 2.4 50 600 100 45 TYP MAX UNITS mAp-p nArms kHz ps dB GHz ps
2
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+3.3V, 2.5Gbps Quad Transimpedance Amplifier for System Interconnects
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.14V to +3.6V, TA = 0°C to +85°C. Typical values are at +3.3V, TA = +25°C, unless otherwise noted. Total source capacitance = 0.7pF.) (Note 2) AC characteristics are guaranteed by design and characterization. The maximum input current is specified with output deterministic jitter 45ps. No external compensation capacitors are used. Measured with IIN = 30µAavg. Deterministic jitter is the arithmetic sum of pattern-dependent jitter and pulse width distortion. Measured with a 213 -1 PRBS with 100 consecutive 0s and 100 consecutive 1s applied to a single channel. See Typical Operating Characteristics. Note 6: PSRR = -20log(VOUT / Vnoise(on VCC)), f 2MHz. Measured by applying DC current = 30µA, and applying 100mVp-p signal at power supply. Note 7: Measured by applying the same input signal to all channels. Skew measurements are made at the 50% point of the transition. Note 2: Note 3: Note 4: Note 5:
MAX3825
Typical Operating Characteristics
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
DETERMINISTIC JITTER vs. INPUT AMPLITUDE
MAX3825 toc01
FREQUENCY RESPONSE
75 50 45 PEAK-TO-PEAK JITTER (ps) 40 35 30 25 20 15 10 5 50 1 10 100 FREQUENCY (MHz) 1000 10,000 0 0
INPUT-REFERRED RMS NOISE CURRENT vs. DC INPUT CURRENT
MAX3825 toc02 MAX3825 toc03
1400 INPUT-REFERRED NOISE (nARMS) 1200 1000 800 CIN = 0.7pF 600 400 200 0
70 TRANSIMPEDANCE (dB)
65
60
55
400
800
1200
1600
2000
10
100 DC INPUT CURRENT (µA)
1000
INPUT CURRENT AMPLITUDE (µAp-p)
DIFFERENTIAL OUTPUT AMPLITUDE vs. TEMPERATURE
MAX3825 toc04
DC TRANSFER FUNCTION
DIFFERENTIAL OUTPUT VOLTAGE (mVp-p)
MAX3825 toc05
410 DIFFERENTIAL OUTPUT AMPLITUDE (mpVp-p) 390 370 350 330 310 290 270 250
INPUT = 2mAp-p VCC = +3.6V
200
100
VCC = +3.14V
0
-100
-200 -15 10 35 60 85 -100 -50 0 50 100 AMBIENT TEMPERATURE (°C) INPUT CURRENT (µA)
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