AD7740YRT 查看數據表（PDF） - Analog Devices
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AD7740YRT Datasheet PDF : 11 Pages
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AD7740
PIN CONFIGURATIONS
8-Lead microSOIC
8-Lead SOT-23
CLKOUT 1
8 BUF
CLKIN 2
AD7740
microSOIC
7 FOUT
GND 3 TOP VIEW 6 VDD
(Not to Scale)
REFIN/OUT 4
5 VIN
BUF 1
8 CLKOUT
FOUT 2
AD7740
SOT-23
7 CLKIN
VDD 3 TOP VIEW 6 GND
(Not to Scale)
VIN 4
5 REFIN/OUT
PIN FUNCTION DESCRIPTIONS
8-LEAD microSOIC PIN NUMBERS*
Pin
No. Mnemonic Function
1 CLKOUT The crystal/resonator is tied between this pin and CLKIN. In the case of an external clock driving CLKIN, an
inverted clock signal appears on this pin and can be used to drive other circuitry provided it is buffered first.
2 CLKIN
The master clock for the device may be in the form of a crystal/resonator tied between this pin and CLKOUT.
An external CMOS-compatible clock may also be applied to this input as the clock for the device. If CLKIN
is inactive low for 1 ms (typ), the AD7740 automatically enters power-down.
3 GND
Ground reference for all the circuitry on-chip.
4 REFIN/OUT Voltage Reference Input. This is the reference input to the core of the VFC and defines the span of the VFC.
If this pin is left unconnected, the internal 2.5 V reference is the default reference. Alternatively, a precision
external reference may be used to overdrive the internal reference. The internal reference has high output
impedance in order to allow it to be overdriven.
5 VIN
The analog input to the VFC. It has a nominal input range from 0 V to VREF which corresponds to an output
frequency of 10% fCLKIN to 90% fCLKIN. It has a ± 150 mV overrange. If buffered, it draws virtually no current
from whatever source is driving it.
6 VDD
Power Supply Input. These parts can be operated at 3.3 V ± 10% or 5 V ± 5%. The supply should be
adequately decoupled with a 10 µF and a 0.1 µF capacitor to GND.
7 FOUT
8 BUF
Frequency Output. FOUT goes from 10% to 90% of fCLKIN, depending on VIN.
Buffered Mode Select Pin. When BUF is tied low, the VIN input is unbuffered and the range on the VIN
pin is –0.15 V to VDD + 0.15 V. When it is tied high, VIN is buffered and the range on the VIN pin
is restricted to 0.1 V to VDD – 0.2 V.
*Note that the SOT-23 and microSOIC packages have different pinouts.
Model
AD7740KRM
AD7740YRT
AD7740YRM
Temperature Range
0°C to 85°C
–40°C to +105°C
–40°C to +105°C
ORDERING GUIDE
Package Description
microSOIC Package
SOT-23 Package
microSOIC Package
Package
Option
RM-8
RT-8
RM-8
Branding
Information
VOK
VOY
VOY
–4–
REV. A
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