WM8148 Wolfson Microelectronics Ltd., WM8148 Datasheet - Page 7

• Manufacturer Part Number: WM8148
• Description: WM8148 : 12-BIT/12 MSPS Ccd/cis Analogue Front End/digitiser
• Manufacturer: Wolfson Microelectronics Ltd.

WM8148
INPUT VIDEO SAMPLING (EXTERNAL VSMP)
Figure 1 Input Video Timing (External VSMP)
TEST CONDITIONS
AVDD = 4.75 to 5.25V, DVDD1 and DVDD2 = 2.97 to 5.25V, AGND = DGND = 0V, T
otherwise stated (AVDD denotes the voltage applied to all AVDD pins).
Notes: 1. t
WOLFSON MICROELECTRONICS LTD
PARAMETER
MCLK period
(dependent on mode selected)
MCLK duty cycle
VSMP set-up time
VSMP hold time
Video level set-up time
Video level hold time
Reset level set-up time
Reset level hold time
VIDEO
INPUT
MCLK
V S M P
2. The reset sample point may be relative to either the rising or the falling edge of MCLK, depending on the setting of
3. Parameters are measured at 50% of the rising/falling edge.
control bits RESREF[3:0].
VSU
and t
RSU
denote the set-up time required from when the input video signal has settled.
t
V S M P S U
t
P E R
SYMBOL
t
VSMPSU
t
VSMPH
t
t
t
t
t
PER
VSU
RSU
VH
RH
t
V S M P H
TEST CONDITIONS
t
V S U
t
V H
20.8
MIN
45
10
10
10
10
A
2
5
= 0 to 70 C, MCLK = 48MHz unless
TYP
t
R S U
t
R H
MAX
PD Rev 4.0 April 1999
55
Production Data
UNITS
ns
ns
ns
ns
ns
ns
ns
%
7