DAC5688 datasheet(6/55 Pages) TI

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DAC5688

SLLS880B – DECEMBER 2007 – REVISED MAY 2010

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ELECTRICAL CHARACTERISTICS (AC SPECIFICATIONS)

Over recommended operating free-air temperature range, AVDD, IOVDD = 3.3 V, DVDD, CLKVDD = 1.8 V, IOUTFS = 20 mA

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ANALOG OUTPUT(1)

fDAC

Maximum output update rate

800

MSPS

ts(DAC)

Output settling time to 0.1%

Transition: Code 0x0000 to 0xFFFF

10.4

DAC outputs are updated on falling edge of DAC clock.

tpd

Output propagation delay

Does not include Digital Latency (see below).

tr(IOUT)

Output rise time

10% to 90%

220

tf(IOUT)

Output fall time

90% to 10%

220

No Interp, NCO off, QMC off, ISINC = off

109

x2 Interpolation, NCO off, QMC off, ISINC = off

172

x4 Interpolation, NCO off, QMC off, ISINC = off

276

DAC

Digital Latency

x8 Interpolation, NCO off, QMC off, ISINC = off

488

clock

cycles

x8 Interpolation, NCO on, QMC off, ISINC = off

512

x8 Interpolation, NCO on, QMC on, ISINC = off

528

x8 Interpolation, NCO on, QMC on, ISINC = on

548

AC PERFORMANCE (2)

×4 Interp, PLL off, CLK2 = 800 MHz,

FOUT= 10.1 MHz

Spurious free dynamic

DAC A+B on,

SFDR

dBc

FOUT= 20.1 MHz

range

0 dBFS Single tone, FOUT = FIN

First Nyquist Zone < fDATA/2

×4 Interp, PLL off, CLK2 = 800 MHz,

NCO= 10 MHz, FOUT= 20.1 MHz

DAC A+B on,

NCO= 60 MHz, FOUT= 70.1 MHz

0 dBFS Single tone, FIN = 10.1 MHz,

SNR

Signal-to-Noise Ratio

dBc

FOUT = FIN + NCO

NCO= 140 MHz, FOUT= 150.1 MHz

NCO= 290 MHz, FOUT= 300.1 MHz

×4 Interp, PLL off, CLK2 = 800 MHz,

NCO= 40 MHz, FOUT= 51±0.5 MHz

Third-order

DAC A+B on,

IMD3

Two-Tone intermodulation

NCO= 60 MHz, FOUT= 71±0.5 MHz

dBc

FIN = 10.5 and 11. 5 MHz,

(Each tone at –6 dBFS)

FOUT = FIN + NCO

NCO= 130 MHz, FOUT= 141±0.5 MHz

Four-tone Intermodulation

×4 Interp, PLL off, CLK2 = 800 MHz, DAC A+B on,

IMD

to Nyquist

FIN = 9.8, 10.4, 11.6 and 12.2 MHz (600kHz spacing), NCO = 129 MHz,

dBc

(Each tone at –12 dBFS)

FOUT = FIN + NCO = 140±1.2 MHz

×8 Interp, PLL off, CLK2 = 737.28 MHz,

Single Carrier, FOUT = 23.04 MHz

DAC A+B on, FIN = 23 .04 MHz, NCO = off

ACLR

Adjacent Channel

×8 Interp, PLL off, CLK2 = 737.28 MHz,

Single Carrier, FOUT = 70MHz

dBc

(3)

Leakage Ratio

DAC A+B on, FIN = Baseband I/Q,

Single Carrier, FOUT = 140MHz

FOUT = NCO

Four Carrier, FOUT = 140MHz

×8 Interp, PLL off, CLK2 = 737.28 MHz,

Single Carrier Noise Floor

101

dBm

Noise Floor,

DAC A+B on,

Single Carrier NSD in 1 MHz BW

161

dBm/Hz

Noise Spectral Density

FIN = FOUT = Baseband I/Q,

(NSD)

50 MHz offset, 1 MHz BW

Four Carrier Noise Floor

101

dBm

(3)

Four Carrier NSD in 1 MHz BW

161

dBm/Hz

(1)

Measured differential across IOUTA1 and IOUTA2 or IOUTB1 and IOUTB2 with 25

Ω each to AVDD.

(2)

4:1 transformer output termination, 50

Ω doubly terminated load

(3)

W-CDMA with 3.84 MHz BW, 5-MHz spacing, centered at IF. TESTMODEL 1, 10 ms

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