AD9653 datasheet(24/40 Pages) AD

24 / 40 page

AD9653

Data Sheet

Rev. 0 | Page 24 of 40

Figure 56. Differential Double Balun Input Configuration for Baseband Applications

Figure 57. Differential Transformer-Coupled Configuration

for Baseband Applications

If the internal reference of the AD9653 is used to drive multiple

converters to improve gain matching, the loading of the reference

by the other converters must be considered. Figure 58 and

Figure 59 show how the internal reference voltage is affected by

Figure 58. VREF = 1.0 V Error vs. Load Current

Figure 59. VREF =1.3 V Error vs. Load Current

External Reference Operation

The use of an external reference may be necessary to enhance

the gain accuracy of the ADC or improve thermal drift charac-

teristics. Figure 60 and Figure 61 show the typical drift characteris-

tics of the internal reference in 1.0 V mode and programmable

1.3 V mode, respectively.

ADC

0.1µF

2V p-p

VCM

*C1

0.1µF

33Ω

200Ω

33Ω

VIN+x

VIN–x

ET1-1-I3

5pF

*C1 IS OPTIONAL

2V p-p

*C1

*C1 IS OPTIONAL

49.9Ω

0.1μF

ADT1-1WT

1:1 Z RATIO

VIN–x

ADC

VIN+x

*C1

VCM

33Ω

200Ω

0.1µF

5pF

–0.5

–1.0

–1.5

–2.0

–2.5

–3.0

–3.5

–4.0

–4.5

–5.0

3.0

2.5

2.0

1.5

1.0

0.5

LOAD CURRENT (mA)

INTERNAL VREF = 1.0V

–1

–2

–3

–4

–5

–6

–7

–8

–9

3.0

2.5

2.0

1.5

1.0

0.5

LOAD CURRENT (mA)

INTERNAL VREF = 1.3V

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