Datasheet

AD9785/AD9787/AD9788
Rev. A | Page 5 of 64
Parameter Test Conditions/Comments Min Typ Max Unit
LATENCY (DACCLK CYCLES)
1× Interpolation With or without modulation 40 Cycles
2× Interpolation With or without modulation 83 Cycles
4× Interpolation With or without modulation 155 Cycles
8× Interpolation With or without modulation 294 Cycles
Inverse Sinc 18 Cycles
POWER-UP TIME
2
260 ms
DAC Wake-Up Time
3
I
OUT
current settling to 1% 22 ms
DAC Sleep Time
4
I
OUT
current to less than 1% of full scale 22 ms
1
Timing vs. temperature and data valid windows are delineated in Table 25.
2
Measured from SPI_CSB rising edge on Register 0x00; toggle Bit 4 from 0 to 1. VREF decoupling capacitor = 0.1 µF.
3
Measured from SPI_CSB rising edge on Register 0x05 or Register 0x07; toggle Bit 15 or Bit 14 from 0 to 1.
4
Measured from SPI_CSB rising edge on Register 0x05 or Register 0x07; toggle Bit 15 or Bit 14 from 1 to 0.
AC SPECIFICATIONS
T
MIN
to T
MAX
, AVDD33 = 3.3 V, DVDD33 = 3.3 V, DVDD18 = 1.8 V, CVDD18 = 1.8 V, I
OUTFS
= 20 mA, maximum sample rate, unless
otherwise noted.
Table 3.
AD9785 AD9787 AD9788
Parameter Min Typ Max Min Typ Max Min Typ Max Unit
SPURIOUS-FREE DYNAMIC RANGE (IN-BAND SFDR)
f
DACCLK
= 200 MSPS, f
OUT
= 70 MHz 1× Interpolation 80 82 83 dBc
f
DACCLK
= 200 MSPS, f
OUT
= 70 MHz 2× Interpolation 80 82 83 dBc
f
DACCLK
= 200 MSPS, f
OUT
= 70 MHz 4× Interpolation 78 80 81 dBc
f
DACCLK
= 800 MSPS, f
OUT
= 40 MHz 8× Interpolation 85 87 90 dBc
TWO-TONE INTERMODULATION DISTORTION (IMD)
f
DATA
= 200 MSPS, f
OUT
= 50 MHz 1× Interpolation 80 82 83 dBc
f
DATA
= 200 MSPS, f
OUT
= 50 MHz 2× Interpolation 78 79 80 dBc
f
DATA
= 200 MSPS, f
OUT
= 100 MHz 4× Interpolation 78 79 80 dBc
f
DATA
= 100 MSPS, f
OUT
= 100 MHz 8× Interpolation 70 70 70 dBc
NOISE SPECTRAL DENSITY (NSD), EIGHT TONE, 500 kHz TONE
SPACING
f
DACCLK
= 200 MSPS, f
OUT
= 80 MHz −154 −157 −158 dBm/Hz
f
DACCLK
= 400 MSPS, f
OUT
= 80 MHz −154 −158 −161 dBm/Hz
f
DACCLK
= 800 MSPS, f
OUT
= 80 MHz −154 −159 −162 dBm/Hz
WCDMA ADJACENT CHANNEL LEAKAGE RATIO (ACLR),
SINGLE CARRIER
f
DACCLK
= 491.52 MSPS, f
OUT
= 100 MHz 4× Interpolation 78 80 82 dBc
f
DACCLK
= 491.52 MSPS, f
OUT
= 200 MHz 4× Interpolation 72 74 76 dBc
WCDMA SECOND ADJACENT CHANNEL LEAKAGE RATIO
(ACLR), SINGLE CARRIER
f
DACCLK
= 491.52 MSPS, f
OUT
= 100 MHz 4× Interpolation 80 82 88 dBc
f
DACCLK
= 491.52 MSPS, f
OUT
= 200 MHz 4× Interpolation 78 80 82 dBc