Datasheet

AD9557 Data Sheet
Rev. B | Page 12 of 92
SERIAL PORT SPECIFICATIONS—SPI MODE
Table 15.
Parameter Min Typ Max Unit Test Conditions/Comments
AA
CS
EE
Input Logic 1 Voltage
2.2 V
Input Logic 0 Voltage 1.2 V
Input Logic 1 Current
44 µA
Input Logic 0 Current 88 µA
Input Capacitance
2 pF
SCLK
Internal 30 kΩ pull-down resistor
Input Logic 1 Voltage
2.2 V
Input Logic 0 Voltage 0.8 1.2 V
Input Logic 1 Current
200 µA
Input Logic 0 Current 1 µA
Input Capacitance
2 pF
SDIO
As an Input
Input Logic 1 Voltage
2.2 V
Input Logic 0 Voltage 1.2 V
Input Logic 1 Current
1 µA
Input Logic 0 Current
1 µA
Input Capacitance
2 pF
As an Output
Output Logic 1 Voltage
DVDD3 − 0.6 V 1 mA load current
Output Logic 0 Voltage
0.4 V 1 mA load current
SDO
Output Logic 1 Voltage
DVDD3 − 0.6 V 1 mA load current
Output Logic 0 Voltage
0.4 V 1 mA load current
TIMING
SCLK
Clock Rate, 1/t
CLK
40 MHz
Pulse Width High, t
HIGH
10
ns
Pulse Width Low, t
LOW
13 ns
SDIO to SCLK Setup, t
DS
3 ns
SCLK to SDIO Hold, t
DH
6 ns
SCLK to Valid SDIO and SDO, t
DV
10 ns
AA
CS
EE
AA
to SCLK Setup (t
S
) 10 ns
AA
CS
EE
AA to SCLK Hold (t
C
) 0 ns
AA
CS
EE
AA Minimum Pulse Width High 6 ns