Datasheet

DAC3484
SLAS749C –MARCH 2011–REVISED AUGUST 2012 www.ti.com
ELECTRICAL CHARACTERISTICS – AC SPECIFICATIONS
over recommended operating free-air temperature range, nominal supplies, IOUT
FS
= 20mA (unless otherwise noted)
PARAMETER TEST CONDITIONS / COMMENTS MIN TYP MAX UNIT
ANALOG OUTPUT
(1)
f
DAC
Maximum DAC rate 1250 MSPS
t
s(DAC)
Output settling time to 0.1% Transition: Code 0x0000 to 0xFFFF 10 ns
DAC outputs are updated on the falling edge of DAC clock.
t
pd
Output propagation delay 2 ns
Does not include Digital Latency (see below).
t
r(IOUT)
Output rise time 10% to 90% 220 ps
t
f(IOUT)
Output fall time 90% to 10% 220 ps
No interpolation, FIFO on, Mixer off, QMC off, Inverse sinc
128
off
2x Interpolation 216
4x Interpolation 376
DAC
8x Interpolation 726
Digital Latency clock
cycles
16x Interpolation 1427
Fine Mixer 24
QMC 32
Inverse Sinc 36
DAC Wake-up Time IOUT current settling to 1% of IOUT
FS
from output sleep 2
Power-up
μs
IOUT current settling to less than 1% of IOUT
FS
in output
Time
DAC Sleep Time 2
sleep
AC PERFORMANCE
(2)
f
DAC
= 1.25 GSPS, f
OUT
= 20 MHz 82
Spurious free dynamic range
SFDR f
DAC
= 1.25 GSPS, f
OUT
= 50 MHz 77 dBc
(0 to f
DAC
/2) Tone at 0 dBFS
f
DAC
= 1.25 GSPS, f
OUT
= 70 MHz 72
f
DAC
= 1.25 MSPS, f
OUT
= 30 ± 0.5 MHz 81
Third-order two-tone intermodulation distortion
IMD3 f
DAC
= 1.25 GSPS, f
OUT
= 50 ± 0.5 MHz 79 dBc
Each tone at –12 dBFS
f
DAC
= 1.25 GSPS, f
OUT
= 100 ± 0.5 MHz 77.5
f
DAC
= 1.25 GSPS, f
OUT
= 10 MHz 160
Noise Spectral Density
NSD dBc/Hz
Tone at 0dBFS
f
DAC
= 1.25 GSPS, f
OUT
= 80 MHz 155
f
DAC
= 1.2288 GSPS, f
OUT
= 30.72 MHz 77
Adjacent channel leakage ratio, single carrier
f
DAC
= 1.2288 GSPS, f
OUT
= 153.6 MHz 74
ACLR
(3)
dBc
f
DAC
= 1.2288 GSPS, f
OUT
= 30.72 MHz 82
Alternate channel leakage ratio, single carrier
f
DAC
= 1.2288 GSPS, f
OUT
= 153.6 MHz 80
Channel Isolation f
DAC
= 1.25 GSPS, f
OUT
= 10 MHz 84 dBc
(1) Measured single ended into 50 Ω load.
(2) 4:1 transformer output termination, 50 Ω doubly terminated load.
(3) Single carrier, W-CDMA with 3.84 MHz BW, 5-MHz spacing, centered at IF, PAR = 12dB. TESTMODEL 1, 10 ms
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