AD9146BCPZ datasheet(35/52 Pages) AD

Part #	AD9146BCPZ

Description	Dual, 16-Bit, 1230 MSPS, TxDAC Digital-to-Analog Converter

PDF	52 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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35 / 52 page

AD9146

Rev. 0 | Page 35 of 52

–3.0

–3.2

–3.4

–3.6

–3.8

–4.0

0.3

0.4

0.2

0.1

fOUT/fDAC

INVERSE SINC FILTER

The inverse sinc (sinc−1) filter is a nine-tap FIR filter. The composite

response of the sinc−1 filter and the sin(x)/x response of the DAC

is shown in Figure 46. The composite response has a pass-band

ripple of less than ±0.05 dB up to a frequency of 0.4 × fDACCLK. To

provide the necessary peaking at the upper end of the pass band,

the inverse sinc filters shown have an intrinsic insertion loss of

about 3.2 dB. Figure 46 shows the composite frequency response.

The sinc−1 filter is disabled by default. It can be enabled by setting

the bypass sinc−1 bit to 0 (Register 0x1B, Bit 6).

Figure 46. Sample Composite Responses of the Sinc−1 Filter

with sin(x)/x Roll-Off

AD9146BCPZ Datasheet(PDF) 35 Page - Analog Devices