MAX3825U/D Maxim Integrated, MAX3825U/D Datasheet

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MAX3825U/D

Manufacturer Part Number
MAX3825U/D
Description
Limiting Amplifiers
Manufacturer
Maxim Integrated
Datasheet
1.MAX3825UD.pdf (8 pages)
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 tran-
simpedance gain of 3.7kΩ. The circuit features
460nA
sponding to an optical input sensitivity of -22.3dBm
(BER ≤ 1 × 10
has 20ps of deterministic jitter and a 2.4GHz small-sig-
nal bandwidth. The MAX3825 is optimized for use with
a quad PIN photodetector array with a standard fiber
pitch of 250µm.
The 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 dif-
ferential output swing over a wide range of input cur-
rents.
Each channel has an independent supply and ground
to allow all or any combination of channels to be con-
nected. This device is available in dice only.
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.
Typical Operating Circuit appears at end of data sheet.
19-1855 Rev 0; 11/00
+3.3V, 2.5Gbps Quad Transimpedance Amplifier
RMS
of input-referred noise per channel corre-
GNDO1
GNDO2
V
-14
GNDI2
GNDI1
VCCI2
VCCI1
CCFILT
GNDF
N.C.
). The quad transimpedance amplifier
________________________________________________________________ Maxim Integrated Products
37
38
39
40
41
42
43
44
General Description
V
36
CCO1
N.C.
1
OUT1+ OUT1- V
35
N.C. FILTER
2
34
3
33
CCO1
V
32
CCO2
IN1 FILT1 IN2 FILT2 IN3 FILT3 IN4 FILT4
4
OUT2+ OUT2- V
31
5
30
6
for System Interconnects
CCO2
29
7
V
CCO3
28
Chip Topography/Pad Configuration
o Single +3.3V Supply
o 93mW per Channel Power Dissipation
o 460nA
o 20ps Deterministic Jitter
o 2.4GHz Small-Signal Bandwidth
o No External Compensation
o 40dB Power-Supply Rejection Ratio
o Compact Die with 250µm Channel Pitch
o 100Ω Differential Output Impedance
*Dice are designed to operate with a 0°C to +120°C junction
temperature, but are tested and guaranteed only at T
MAX3825U/D
8
OUT3+ OUT3- V
27
System Interconnects
SDH/SONET
Backplanes
Dense Digital Cross-
Connects
PART
9
26
10
RMS
25
CCO3
11
Input-Referred Noise
V
24
CCO4
OUT4+ OUT4-V
23
TEMP. RANGE
0°C to +85°C
N.C.
12
Ordering Information
22
N.C.
13
21
CCO4
ATM Switching
Networks
High-Speed Parallel
Optical Links
20
19
18
17
16
15
14
Applications
PIN-PACKAGE
Dice*
GNDO4
GNDO3
ENABLE
GNDI4
GNDI3
VCCI3
VCCI4
Features
A
= +25°C.
1

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MAX3825U/D Summary of contents

Page 1

... No External Compensation o 40dB Power-Supply Rejection Ratio o Compact Die with 250µm Channel Pitch o 100Ω Differential Output Impedance PART MAX3825U/D *Dice are designed to operate with a 0°C to +120°C junction temperature, but are tested and guaranteed only at T System Interconnects SDH/SONET ...

Page 2

Quad Transimpedance Amplifier for System Interconnects ABSOLUTE MAXIMUM RATINGS Supply Voltage CCO1 CCO2 CCO3 CCO4 ...............-0.5V to +6.0V CCI1 CCI2 CCI3 ...

Page 3

Quad Transimpedance Amplifier AC ELECTRICAL CHARACTERISTICS (continued +3.14V to +3.6V 0°C to +85°C. Typical values are at +3.3V tance = 0.7pF.) (Note 2) Note 2: AC characteristics are guaranteed by design ...

Page 4

Quad Transimpedance Amplifier for System Interconnects (V = +3.3V +25°C, unless otherwise noted ELECTRICAL EYE DIAGRAM INPUT = 2mAp-p, 2.5Gbps, 2 10mV/div 100Ω DIFFERENTIAL 50ps/div PAD NAME 1, 2, 12, 13 ...

Page 5

Quad Transimpedance Amplifier IN_ GNDI_ GNDI_ Q4 GNDI_ Figure 1. Functional Diagram for One Channel of the MAX3825 Detailed Description The MAX3825 quad TIA circuit is designed for 2.5Gbps SONET/SDH applications. It comprises a transimped- ance amplifier, a ...

Page 6

Quad Transimpedance Amplifier for System Interconnects nally pulled low does not need to be bonded out for the DC cancellation loop to function. The MAX3825 minimizes pulse-width distortion for data sequences exhibiting a 50% duty cycle ...

Page 7

Quad Transimpedance Amplifier  µ Linear Range 10 log  10 ρ −  where ρ is the photodiode responsivity in A/W. Connect all input ground connections as close as ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2000 Maxim Integrated Products ...

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