AD9508(RevA) データシートの表示（PDF） - Analog Devices
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AD9508 Datasheet PDF : 40 Pages
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AD9508
Data Sheet
Pin No.
18
19
20
21
22
23
24
Mnemonic
RESETE
A
SCLK/SCL/S0
SYNCE
A
CLK
CLKE
A
IN_SEL
SDIO/SDA/S1
EP
Description
CMOS Input. Device Reset. When this active low pin is asserted, the internal register settings enter their
default state after the RESETE is released. Note that RESETE also serves as a power-down of the device
A
A
A
A
while an active low signal is applied to the pin. The RESETE pin has an internal 24 kΩ pull-up resistor.
A
A
Serial Programming Clock/Data Clock/Programming Pin. Multipurpose pin controlled by the PROG_SEL
pin used for serial programming clock (SCLK) in SPI mode or data clock (SCL) for serial programming in
I2C Mode. The PROG_SEL pin determines which programming mode is used. In pin programming
mode, this pin becomes S0. In this mode, S0 is hardwired with a resistor to either VDD or ground. The
resistor value and resistor biasing determine the channel divider values for the outputs on Pin 2 and
Pin 3. See the Pin Strapping to Program on Power-Up section for more details.
Clock Synchronization. When this pin is active low, the output drivers are held static and then
synchronized on a low-to-high transition of this pin. The SYNCE pin has an internal 24 kΩ pull-up
A
A
resistor.
Differential Clock Input or Single-Ended CMOS Input. Whether this pin serves as the differential clock
input or the single-ended CMOS input depends on the logic state of the IN_SEL pin.
Complementary Differential Clock Input.
CMOS Input. A logic high configures the CLK and CLKE inputs for a differential input signal. A logic low
A
A
configures the input for single-ended CMOS applied to the CLK pin. AC-couple the unused CLKE to
A
A
ground with a 0.1 μF capacitor.
Serial Data Input and Output (SPI)/Serial Data (I2C)/Pin Programming. Pin 24 is a multipurpose input
controlled by the PROG_SEL pin used for SPI (SDIO), I2C (SDA), and pin strapping modes (S1). When the
device is in 4-wire SPI mode, data is written via SDIO. In 3-wire mode, both data reads and writes occur
on this pin. There is no internal pull-up/pull-down resistor on this pin. In I2C mode, SDA serves as the
serial data pin. The PROG_SEL pin determines which programming mode is used. In pin programming
mode, this pin becomes S1. In this mode, S1 is hardwired with a resistor to either VDD or ground. The
resistor value and resistor biasing determine the channel divider values for the outputs on Pin 7 and
Pin 8. See the Pin Strapping to Program on Power-Up section for more details.
Exposed Pad. The exposed die pad must be connected to ground (VSS).
Rev. A | Page 12 of 40
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