
AD9974
Rev. A | Page 4 of 52
TIMING SPECIFICATIONS
X = A = B, CL = 20 pF, AVDD_X = DVDD_X = 1.8 V, fCLI = 65 MHz, unless otherwise noted.
Table 3.
Parameter
Min
Typ
Max
Unit
Comments
MASTER CLOCK (CLI)
CLI Clock Period (tCONV)
15.38
ns
CLI High/Low Pulse Width (tADC)
6.9
7.7
8.9
ns
Delay from CLI Rising Edge to Internal Pixel Position 0 (tCLIDLY)
5
ns
AFE
SHP Rising Edge to SHD Rising Edge (tS1)
6.9
7.7
8.5
ns
AFE Pipeline Delay
16
Cycles
CLPOB Pulse Width (Programmable) (tCOB)1 2
20
Pixels
HD Pulse Width
tCONV
ns
VD Pulse Width
1 HD period
ns
SERIAL INTERFACE
Maximum SCK Frequency (fSCLK)
40
MHz
SL to SCK Setup Time (tLS)
10
ns
SCK to SL Hold Time (tLH)
10
ns
SDATA Valid to SCK Rising Edge Setup (tDS)
10
ns
SCK Rising Edge to SDATA Valid Hold (tDH)
10
ns
H-COUNTER RESET SPECIFICATIONS
HD Pulse Width
tCONV
ns
VD Pulse Width
1 HD period
ns
VD Falling Edge to HD Falling Edge(tVDHD)
0
VD period tCONV
ns
HD Falling Edge to CLI Rising Edge(tHDCLI)
3
tCONV 2
ns
CLI Rising Edge to SHPLOC (Internal Sample Edge) (tCLISHP)
3
tCONV 2
ns
TIMING CORE SETTING RESTRICTIONS
Inhibited Region for SHP Edge Location (tSHPINH) (See Figure 21)2 50
64/0
Edge location
Inhibited Region for SHP or SHD with Respect to H-Clocks
RETIME = 0, MASK = 0 (tSHDINH)
H × NEGLOC 15
H × NEGLOC 0
Edge location
RETIME = 0, MASK = 1 (tSHDINH)
H × POSLOC 15
H × POSLOC 0
Edge location
RETIME = 1, MASK = 0 (tSHPINH)
H × NEGLOC 15
H × NEGLOC 0
Edge location
RETIME = 1, MASK = 1 (tSHPINH)
H × POSLOC 15
H × POSLOC 0
Edge location
Inhibited Region for DOUTPHASE Edge Location (tDOUTINH)
SHDLOC + 0
SHDLOC + 15
Edge location
1 Minimum CLPOB pulse width is for functional operation only. Wider typical pulses are recommended to achieve good clamp performance.
2 Only applies to slave mode operation. The inhibited area for SHP is needed to meet the timing requirements for tCLISHP for proper H-counter reset operation.
3 When 0x34[2:0] HxBLKRETIME bits are enabled, the inhibit region for SHD location changes to inhibit region for SHP location.
4 When sequence register 0x09[23:21] HBLK masking registers are set to 0, the H-edge reference becomes H × NEGLOC.
5 The H-clock signals that have SHP/SHD inhibit regions depend on the HCLK mode: Mode 1 = H1, Mode 2 = H1, H2, and Mode 3 = H1, H3.
6 These specifications apply when H1POL, H2POL, RGPOL, and HLPOL are all set to 1 (default setting).