Sony CXA1684M Datasheet

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E94X23A8Y

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any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

Absolute Maximum Ratings

• Supply voltage VCC–VEE –0.3 to +7.0 V

• Minimum input voltage VIN VEE V

• Input current IIN –1 to +1 mA

• Output current

(Continuous) IO 0 to 50 mA

(Q/QB) (Surge) 0 to 100 mA

• Storage temperature Tstg –65 to +150 °C

Recommended Operating Conditions

• DC power supply voltage

VCC–VEE 4.75 to 5.46 V

• Operating ambient temperature
Ta 0 to +85 °C

Structure

Bipolar silicon monolithic IC

Description

CXA1684M is a low noise transimpedance
amplifier, particularly suitable for fiber-optic system.
CXA1684M is fabricated using high-speed bipolar
process.

Features

• High transimpedance: (Q) 3.9 kΩ (Typ.)

(QB)3.7 kΩ (Typ.)

• Wide band width (–3dB): (Q) 630 MHz (Typ.)

(QB)390 MHz (Typ.)

• Maximum input current: 1mA

Applications

• Q output

SONET/SDH: 622 Mb/s

Fiber channel: 532 Mb/s

• Differential output

SONET/SDH: 155 Mb/s

Fiber channel: 133,266 Mb/s

ESCON: 200 Mb/s

High-Speed Transimpedance Amplifier

8 pin SOP (Plastic)

CXA1684M

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CXA1684M

Item

Supply current

Transimpedance

Q

QB

Max. Input Current before clipping

Max. Input Current

Input voltage

Output voltage

Q

QB

Input capacitance

Symbol

IEE

ZTQ

ZTQB

IIN

IIN2

VIN

VOUTQ

VOUTQB

VC

CIN

Test Condition

input pin left open

input pin left open

Min. Typ. Max. Unit

–15.1 –11.2 mA

2.3 3.9 5.6
kΩ

1.9 3.7 5.4

+100

µA

+1000

VEE+2.5
VEE+1.9

V

VCC–2.6
VEE+1.7

2.0 pF

Block Diagram and Pin Assignment

1

2

3

4

VCC

QB

Q

V

EE

VCC

IN

C

V

EE

5

6

7

8

Zt

∗1

Assumes photodiode capacitance; CPD<1.0 pF, output load capacitance; Cout=2.0 pF, Q: 620 Ω to VEE,
QB: 1.3k Ω to VEE

Electrical Characteristics

• DC Electrical Characteristics (VCC=GND, VEE=–5.46 to –4.75V, Ta=0 to +85°C)

Item

Bandwidth Q

(–3 dB) QB

Input Current Noise Spectral

Density (Mean value)

Symbol

f–3 dBQ

f–3 dBQB

In

Test Condition

∗

1

fN=1 kHz to 622 MHz

Min. Typ. Max. Unit

435 630

MHz

187 390

4.0 pA/√Hz

• AC Electrical Characteristics (VCC=GND, VEE=–5.46 to –4.75 V, Ta=0 to +85 °C)