AD809 データシートの表示（PDF） - Analog Devices
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AD809 Datasheet PDF : 8 Pages
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PIN DESCRIPTIONS
Pin
No. Mnemonic
Description
1 PECLINN
Differential 155 MHz Input
2 PECLIN
Differential 155 MHz Input
3
VCC2
Digital VCC for PECL Outputs
4 CLKOUTN Differential 155 MHz Output
5 CLKOUT
Differential 155 MHz Output
6
VCC1
7 CF1
Digital VCC for Internal Logic
Loop Damping Capacitor
8 CF2
Loop Damping Capacitor
9 AVEE
Analog VEE
10 TTL/CMOSIN TTL/CMOS Reference Clock Input
11 AVCC1
12 CLKINN
Analog VCC for PLL
PECL Differential Reference Clock Input
13 CLKIN
PECL Differential Reference Clock Input
14 AVCC2
15 MUX
Analog VCC for Input Stage
Input Signal Mux Control Input
16 VEE
Digital VEE
PIN CONFIGURATION
PECLINN 1
PECLIN 2
16 VEE
15 MUX
VCC2 3
14 AVCC2
CLKOUTN 4 AD809 13 CLKIN
TOP VIEW
CLKOUT 5 (Not to Scale) 12 CLKINN
VCC1 6
11 AVCC1
CF1 7
10 TTL/CMOSIN
CF2 8
9 AVEE
AD809
Table I.
MUX Input Input Selected
TTL “0”
TTL “1”
CLKIN/CLKINN
PECLIN/PECLINN
Table II. Applying a PECL/ECL or CMOS/TTL Reference
Input to the AD809
Input Reference
AD809 Configuration
PECL/ECL Differential
Apply the valid PECL–level reference
frequency to Pins 13 and 12.
AD809 frequency synthesizer ignores
the input at Pin 10.
TTL/CMOS
Single-Ended
Apply the reference frequency to
Pin 10.
Connect Pins 13 and 12 to AVEE
(Pins 9 and 16). The AD809 senses
the common-mode signal at these pins
as less than valid PECL and selects the
TTL/CMOS input as active.
AD809 Phase Skew
The AD809 output is in phase with the input. The falling edge
at Pin 4, CLKOUTN, occurs 700 ps before the rising edge at
Pin 10, TTL/CMOSIN at 27°C. The phase skew remains rela-
tively constant over temperature. Refer to Table III for phase
skew data.
Table III. Phase Skew vs. Temperature
Temperature
(؇C)
–35
–20
0
10
30
50
70
80
90
100
Skew (CLKOUTN, Pin 4, Relative to
TTL/CMOSIN, Pin 10 Measured in
ps at Package Pins)
–1000
–950
–850
–750
–700
–600
–450
–450
–350
–250
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD809 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. A
–3–
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