DAC5687IPZP datasheet(17/79 Pages) TI

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f − Frequency − MHz

−130

−120

−110

−100

−90

−80

−70

−60

−50

−40

−30

−20

133

138

143

148

153

158

163

168

173

G025

fdata = 122.88 MSPS

IF = 153.6 MHz

y4 Interpolation

CMIX

Carrier Power 1 (Ref): −19.88 dBm

ACLR (5 MHz): 66.6 dB

ACLR (10 MHz): 65.73 dB

Test Methodology

DAC5687

SLWS164E – FEBRUARY 2005 – REVISED SEPTEMBER 2006

Typical Characteristics (continued)

Figure 25. WCDMA TM1: Four Carriers, PLL Off,

DVDD = 2.1 V

Typical ac specifications in external clock mode were characterized with the DAC5687EVM using the test

configuration shown in Figure 26. The DAC sample-rate clock fDAC is generated by an HP8665B signal

generator. An Agilent 8133A pulse generator is used to divide fDAC for the data-rate clock fDATA for the Agilent

16702A pattern-generator clock and provide adjustable skew to the DAC input clock. The 8133A fDAC output is

set to 1 VPP, equivalent to 2-VPP differential at CLK2/CLK2C pins. Alternatively, the DAC5687 PLLLOCK output

can be used for the pattern generator clock.

The DAC5687 output is characterized with a Rohde & Schwarz FSQ8 spectrum analyzer. For WCDMA signal

characterization, it is important to use a spectrum analyzer with high IP3 and noise subtraction capability so that

the spectrum analyzer does not limit the ACPR measurement. For all specifications, both DACA and DACB are

measured and the lowest value used as the specification.

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