MAX3793(2004) 查看數據表（PDF） - Maxim Integrated

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MAX3793
(Rev.:2004)

1Gbps to 4.25Gbps Multirate Transimpedance Amplifier with Photocurrent Monitor

Maxim Integrated 

1Gbps to 4.25Gbps Multirate Transimpedance

Amplifier with Photocurrent Monitor

If the amount of tolerable noise is known, the filter

capacitor can be easily selected:

CFILT = (VNOISE x CIN) / (RFILT x INOISE)

For example, with maximum noise voltage = 100mVP-P,

CIN = 0.6pF, RFILT = 750Ω, and INOISE at 350nA, the

filter capacitor is:

CFILT = (100mV x 0.6pF) / (750Ω x 350nA) = 229pF

Select RMON

If photocurrent monitoring is desired, connect a resistor

between MON and ground to monitor the average pho-

tocurrent. Select the largest RMON possible:

5-PIN HEADER

MON

OUT-

PHOTODIODE

CFILT

VCC

CVCC

OUT+

RMON = 2.0V

IMONMAX

where, IMONMAX is the largest average input current

observed. An ammeter can also be used to monitor the

current out of the MON pin.

Layout Considerations

Figure 3 shows suggested layouts for 4-pin and 5-pin

TO headers.

Wire Bonding

For high-current density and reliable operation, the

MAX3793 uses gold metalization. For best results, use

gold-wire ball-bonding techniques. Exercise caution if

attempting wedge bonding. The die size is 30 mils x 50

mils (0.762mm x 1.27mm), and the die thickness is 15

mils (380µm). Bond-pad size for the VCC, GND, OUT+,

and OUT- pads is 94µm x 94µm. Bond-pad size for the

FILT, IN, and MON pads is 79µm x 79µm; all bond-pad

metal thickness is 1.2µm. Refer to Maxim Application

Note HFAN-08.0.1: Understanding Bonding Coordinates

and Physical Die Size for additional information on bond-

pad coordinates. Recommended bonding sequence is

shown in Figure 4.

MAX3793

PHOTODIODE IS MOUNTED

ON CFILT, CASE IS GROUND.

4-PIN HEADER

PHOTODIODE

CFILT

VCC

CVCC

OUT-

OUT+

11

3

9

CFILT

1

10

7

CVCC

2

5

6

8

4

MAX3793

PHOTODIODE IS MOUNTED

ON CFILT, CASE IS GROUND.

MAX3793

Figure 3. Suggested TO Header Layouts

Figure 4. Recommended MAX3793 Bonding Scheme

8 _______________________________________________________________________________________

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