Datasheet

161 2 1 2 16
Power-Down
Active
Invalid Data
Invalid Data
Invalid Data
CS
SCLK
Power-Down State
(Internal)
DOUT
Power-Up Delay
1 2 16
Valid Data
1 2 16
Valid Data
T
d(PWRUP)
AL_PD
Programmed as PD
ADS8634
ADS8638
www.ti.com SBAS541A –MAY 2011– REVISED AUGUST 2011
PARAMETER MEASUREMENT INFORMATION (continued)
Table 1. Timing Requirements
(1)(2)(3)
(continued)
ADS8634, ADS8638
TEST
PARAMETER CONDITIONS MIN TYP MAX UNIT
DVDD = 1.8V 7.0 ns
t
su(DIN-SCLK)
Setup time, DIN valid to SCLK rising edge DVDD = 3V 6.0 ns
DVDD = 5V 5.0 ns
DVDD = 1.8V 9.0 ns
t
h(SCLK-DIN)
Hold time, SCLK rising to DIN valid DVDD = 3V 8.0 ns
DVDD = 5V 7.0 ns
DVDD = 1.8V 25 ns
t
W(SCLK_H)
Pulse duration, SCLK high DVDD = 3V 20 ns
DVDD = 5V 20 ns
DVDD = 1.8V 25 ns
t
W(SCLK_L)
Pulse duration, SCLK low DVDD = 3V 20 ns
DVDD = 5V 20 ns
DVDD = 1.8V 16 MHz
f
SCLK
SCLK frequency DVDD = 3V 20 MHz
DVDD = 5V 20 MHz
DVDD = 1.8V 0.84 MSPS
f
SAMPLE
Sampling frequency DVDD = 3V 1 MSPS
DVDD = 5V 1 MSPS
POWER-UP TIMING REQUIREMENTS
Table 2. TIMING REQUIREMENTS
(1)
ADS8634, ADS8638
PARAMETER MIN TYP MAX UNIT
t
d(PWRUP)
(2)
Power-up delay from first CS after power-up command 1 µs
Invalid conversions after device is active (powered up) 1 Conversion
(1) All specifications at –40°C to +125°C, unless otherwise noted.
(2) Power-up time excludes internal reference and temperature sensor.
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