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ATA01504

AGC Transimpedance Amplifier

ANADIGICS 

ATA01504

APPLICATION INFORMATION

V

CAGC

Figure 3: ATA 01504D1C Typical Bonding Diagram

Power supplies and general layout considerations

The ATA01504D1C may be operated from a positive

supply as low as +4.5 V and as high as +6.0 V. Below

+4.5 V, bandwidth, overload and sensitivity will

degrade, while at +6.0 V, bandwidth, overload and

sensitivity. Use of surface mount (preferably MIM type

capacitors), low inductance power supply bypass

capacitors (>=56pF) are essential for good high

frequency and low noise performance. The power

supply bypass capacitors should be mounted on or

connected to a good low inductance ground plane.

General layout considerations

Since the gain stages of the transimpedance

amplifier have an open loop bandwidth in excess of

1.0 GHz, it is essential to maintain good high

frequency layout practices. To prevent oscillations, a

low inductance RF ground plane should be made

available for power supply bypassing. Traces that

can be made short should be made short, and the

utmost care should be taken to maintain very low

capacitance at the photodiode TIA interface (IIN), as

excess capacitance at this node will cause a

degradation in bandwidth and sensitivity (see

Bandwidth vs. CT curves).

210

200

B(3dB) A≈ / 2 π Rf (Cin +Ct)

190

VDD = 5.5 V

180

VDD = 5.0 V

170

160 VDD = 4.5 V

150

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6

CT(pF)

Figure 4: Bandwidth vs. CT

Note: All performance curves are typical @ TA =25 °C

unless otherwise noted.

4

PRELIMINARY DATA SHEET - Rev 1

08/2001

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