ad7740 Analog Devices, Inc., ad7740 Datasheet - Page 3

• Manufacturer Part Number: ad7740
• Description: 3 V/5 V Low Power, Synchronous Voltage-to-frequency Converter
• Manufacturer: Analog Devices, Inc.

TIMING CHARACTERISTICS
Parameter
f
t
t
t
t
t
NOTES
1
2
3
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS
(T
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
Analog Input Voltage to GND . . . . . . . . –0.3 V to V
Reference Input Voltage to GND . . . . . –0.3 V to V
Logic Input Voltage to GND . . . . . . . . –0.3 V to VDD + 0.3 V
FOUT Voltage to GND . . . . . . . . . . . –0.3 V to VDD + 0.3 V
Operating Temperature Range
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Junction Temperature (T
SOT-23 Package
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 AD7740 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.
CLKIN
Guaranteed by design and characterization, not production tested.
All input signals are specified with tr = tf = 5 ns (10% to 90% of VDD) and timed from a voltage level of (V
See Figure 1.
HIGH
1
2
3
4
A
Commercial (K Version) . . . . . . . . . . . . . . . . 0°C to +85°C
Automotive (Y Version) . . . . . . . . . . . . . . –40°C to +105°C
Power Dissipation . . . . . . . . . . . . . . . . . . (T
θ
Reflow Soldering
= 25°C unless otherwise noted)
JA
Lead Temperature (10 secs) . . . . . . . . . . . . . . . . . . 300°C
Peak Temperature . . . . . . . . . . . . . . . . . . . . 220 + 5/0°C
Time at Peak Temperature . . . . . . . . . . . . 10 sec to 40 sec
:t
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 240°C/W
LOW
Limit at T
VDD = 3.0 V to 3.6 V
32
1
40:60
60:40
50
2.3
1.6
t
HIGH
CLKIN
FOUT
± 20
J
Max) . . . . . . . . . . . . . . . . . . 150°C
MIN
, T
t
1
MAX
t
4
1, 2, 3
Limit at T
VDD = 4.75 V to 5.25 V
32
1
40:60
60:40
35
1.8
1.4
t
HIGH
(VDD = 3.0 V to 3.6 V, 4.75 V to 5.25 V, GND = O V, REFIN = 2.5 V)
J
Max – T
± 8
t
HIGH
DD
DD
MIN
+ 0.3 V
+ 0.3 V
A
, T
)/θ
t
LOW
MAX
JA
microSOIC Package
Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
Power Dissipation . . . . . . . . . . . . . . . . . (T
θ
θ
Lead Temperature (10 secs) . . . . . . . . . . . . . . . . . . . 300°C
Reflow Soldering
JA
JC
Peak Temperature . . . . . . . . . . . . . . . . . . . . . . 220 +5/0°C
Time at Peak Temperature . . . . . . . . . . . . . 10 sec to 40 sec
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 206°C/W
Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 44°C/W
Unit
kHz min
MHz max
min
max
ns typ
ns typ
ns typ
ns typ
t
IL
2
+ V
IH
Conditions/Comments
Clock Frequency
Clock Mark/Space Ratio
CLKIN Edge to FOUT Edge Delay
FOUT Rise Time
FOUT Fall Time
FOUT Pulsewidth
)/2.
t
3
WARNING!
ESD SENSITIVE DEVICE
AD7740
J
Max – T
A
)/θ
JA