MAX3825 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – +3.3V, 2.5Gbps Quad Transimpedance Amplifier for System Interconnects

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 tran-
simpedance gain of 3.7kΩ. The circuit features
460nA_RMS of input-referred noise per channel corre-
sponding 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-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.
Typical Operating Circuit appears at end of data sheet.
Features
o Single +3.3V Supply
o 93mW per Channel Power Dissipation
o 460nA_RMS Input-Referred Noise
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
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 T_A = +25°C.
Applications
System Interconnects
SDH/SONET
Backplanes
Dense Digital Cross-
Connects
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 38
GNDF 39
GNDI2 40
VCCI2 41
VCCI1 42
GNDI1 43
VCCFILT 44
12
3
N.C. N.C. FILTER
4 5 6 7 8 9 10 11
IN1 FILT1 IN2 FILT2 IN3 FILT3 IN4 FILT4
19 GNDO3
18
ENABLE
17
GNDI3
16
VCCI3
15
VCCI4
14
GNDI4
12 13
N.C. N.C.
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