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AD7740KRMZ Datasheet(PDF) 4 Page - Analog Devices

Part No. AD7740KRMZ
Description  3 V/5 V Low Power, Synchronous Voltage-to-Frequency Converter
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7740KRMZ Datasheet(HTML) 4 Page - Analog Devices

 
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–4–
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
Frequency Output. FOUT goes from 10% to 90% of fCLKIN, depending on VIN.
8
BUF
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.
ORDERING GUIDE
Package
Branding
Model
Temperature Range
Package Description
Option
Information
AD7740KRM
0
°C to 85°C
microSOIC Package
RM-8
VOK
AD7740YRT
–40
°C to +105°C
SOT-23 Package
RT-8
VOY
AD7740YRM
–40
°C to +105°C
microSOIC Package
RM-8
VOY
PIN CONFIGURATIONS
8-Lead microSOIC
microSOIC
TOP VIEW
(Not to Scale)
8
7
6
5
1
2
3
4
CLKOUT
CLKIN
GND
REFIN/OUT
BUF
FOUT
VDD
VIN
AD7740
8-Lead SOT-23
SOT-23
TOP VIEW
(Not to Scale)
8
7
6
5
1
2
3
4
BUF
FOUT
VDD
VIN
CLKOUT
CLKIN
GND
REFIN/OUT
AD7740
REV. A
AD7740


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