AD7740YRM-REEL Analog Devices Inc, AD7740YRM-REEL Datasheet - Page 4

• Manufacturer Part Number: AD7740YRM-REEL
• Manufacturer: Analog Devices Inc

Specifications of AD7740YRM-REEL

• Converter Function: VFC
• Full Scale Frequency: 1000
• Power Supply Requirement: Single
• Single Supply Voltage (max): 5.25V
• Single Supply Voltage (min): 3V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Package Type: MSOP
• Lead Free Status / Rohs Status: Not Compliant

AD7740
8-LEAD microSOIC PIN NUMBERS
Pin
No.
1
2
3
4
5
6
7
8
Model
AD7740KRM
AD7740YRT
AD7740YRM
Note that the SOT-23 and microSOIC packages have different pinouts.
Mnemonic
CLKOUT
CLKIN
GND
REFIN/OUT Voltage Reference Input. This is the reference input to the core of the VFC and defines the span of the VFC.
VIN
VDD
FOUT
BUF
Function
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.
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.
Ground reference for all the circuitry on-chip.
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.
The analog input to the VFC. It has a nominal input range from 0 V to V
frequency of 10% f
from whatever source is driving it.
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.
Frequency Output. FOUT goes from 10% to 90% of f
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.
Temperature Range
0°C to 85°C
–40°C to +105°C
–40°C to +105°C
REFIN/OUT
CLKOUT
CLKIN
GND
8-Lead microSOIC
1
2
3
4
(Not to Scale)
microSOIC
TOP VIEW
CLKIN
AD7740
PIN FUNCTION DESCRIPTIONS
to 90% f
8
7
6
5
PIN CONFIGURATIONS
BUF
FOUT
VDD
VIN
ORDERING GUIDE
CLKIN
Package Description
microSOIC Package
SOT-23 Package
microSOIC Package
. It has a ± 150 mV overrange. If buffered, it draws virtually no current
FOUT
VDD
BUF
VIN
CLKIN
8-Lead SOT-23
1
2
3
4
(Not to Scale)
TOP VIEW
AD7740
, depending on VIN.
SOT-23
8
7
6
5
CLKOUT
CLKIN
GND
REFIN/OUT
Package
Option
RM-8
RT-8
RM-8
REF
which corresponds to an output
Branding
Information
VOK
VOY
VOY