AD7741BN ,Single and Multichannel, Synchronous Voltage-to-Frequency ConvertersSPECIFICATIONSMAX1 B and Y Version2Parameter Min Typ Max Units Conditions/CommentsDC PERFORMANCEInt ..
AD7741BR ,Single and Multichannel, Synchronous Voltage-to-Frequency ConvertersGENERAL DESCRIPTION+2.5VCLOCKA1The AD7741/AD7742 are a new generation of synchronousREFERENCEGENERA ..
AD7742YR ,Single and Multichannel, Synchronous Voltage-to-Frequency ConvertersSPECIFICATIONS T unless otherwise noted.)MAX1 2 B Version Y Version3Parameter Min ..
AD774BAD ,Complete 12-Bit A/D ConvertersSpecifications subject to change without notice.
AD774BAR ,Complete 12-Bit Successive Approximation Analog-to-Digital Converters With Three-State Output and 8 us ConversionFEATURES FUNCTIONAL BLOCK DIAGRAMComplete Monolithic 12-Bit A/D Converters withReference, Clock, an ..
AD774BBD ,Complete 12-Bit A/D ConvertersFEATURESComplete Monolithic 12-Bit A/D Converters withReference, Clock, and Three-State Output Buff ..
ADM1232ARM ,Microprocessor Supervisory CircuitAPPLICATIONS WATCHDOGTIMERTDTIMEBASEMicroprocessor SystemsSELECTADM1232Portable EquipmentGNDCompute ..
ADM1232ARN ,Microprocessor Supervisory CircuitSPECIFICATIONSCC A MIN MAXParameter Min Typ Max Units Test Conditions/CommentsTEMPERATURE –40 +85 ° ..
ADM1232ARW ,Microprocessor Supervisory CircuitFEATURES FUNCTIONAL BLOCK DIAGRAMSuperior Upgrade for MAX1232 and Dallas DS1232Low Power Consumptio ..
ADM1385ARS ,Low Power, +3.3 V, RS-232 Line Drivers/ReceiversGENERAL DESCRIPTIONThe ADM3202/ADM3222/ADM1385 transceivers are high+3.3V TO +6.6VC1+ V0.1F + CCC3 ..
ADM1385ARS-REEL ,High-Speed, 2-Channel RS232/V.28 Interface Devicesspecifications and operates at data ratesEN SDGNDup to 460 kbps.*INTERNAL 5k PULL-DOWN RESISTOR O ..
ADM1385ARS-REEL7 ,High-Speed, 2-Channel RS232/V.28 Interface DevicesCHARACTERISTICSOperating Voltage Range 3.0 3.3 5.5 VV Power Supply Current 1.3 3 mA No LoadCC812 mA ..
AD7741BN-AD7741BR-AD7742YR
Single and Multichannel, Synchronous Voltage-to-Frequency Converters
REV. 0
Single and Multichannel, Synchronous
Voltage-to-Frequency Converters
FUNCTIONAL BLOCK DIAGRAMS
REFIN
REFOUT
CLKINCLKOUTGND
GAIN
VIN1
VIN2
VIN3
VIN4UNI/BIPVDD
fOUT
FEATURES
AD7741: One Single-Ended Input Channel
AD7742: Two Differential or Three Pseudo-Differential
Input Channels
Integral Nonlinearity of 0.012% at fOUT(Max) = 2.75 MHz
(AD7742) and at fOUT(Max) = 1.35 MHz (AD7741)
Single +5 V Supply Operation
Buffered Inputs
Programmable Gain Analog Front-End
On-Chip +2.5 V Reference
Internal/External Reference Option
Power Down to 35 mA Max
Minimal External Components Required
8-Lead and 16-Lead DIP and SOIC Packages
APPLICATIONS
Low Cost Analog-to-Digital Conversion
Signal Isolation
GENERAL DESCRIPTIONThe AD7741/AD7742 are a new generation of synchronous
voltage-to-frequency converters (VFCs). The AD7741 is a
single-channel version in an 8-lead package (SOIC/DIP) and the
AD7742 is a multichannel version in a 16-lead package (SOIC/
DIP). No user trimming is required to achieve the specified
performance.
The AD7741 has a single buffered input whereas the AD7742
has four buffered inputs that may be configured as two fully-
differential inputs or three pseudo-differential inputs. Both parts
include an on-chip +2.5 V bandgap reference that provides the
user with the option of using this internal reference or an exter-
nal reference.
The AD7741 has a single-ended voltage input range from 0 V
to REFIN. The AD7742 has a differential voltage input range
from –VREF to +VREF. Both parts operate from a single +5 V
supply consuming typically 6 mA, and also contain a power-
down feature that reduces the current consumption to less than
35 mA.
AD7741–SPECIFICATIONS
(VDD = +4.75 V to +5.25 V; VREF = +2.5 V; fCLKIN = 6.144 MHz; all specifications TMIN to
TMAX unless otherwise noted.)NOTES
1Temperature ranges: B Version –40°C to +85°C: Y Version: –40°C to +105°C.
2See Terminology.
3Guaranteed by design and characterization, not production tested.
4Span = Maximum Output Frequency–Minimum Output Frequency.
5The absolute voltage on the input pin must not go more positive than VDD – 2.25 V or more negative than GND.
6Because this pin is bidirectional, any external reference must be capable of sinking/sourcing 400 mA in order to overdrive the internal reference.
7These logic levels apply to CLKOUT only when it is loaded with one CMOS load.
AD7741/AD7742
(VDD = +4.75 V to +5.25 V; VREF = +2.5 V; fCLKIN = 6.144 MHz; all specifications TMIN to
TMAX unless otherwise noted.)NOTES
1Temperature range: B Version: –40°C to +85°C.
2Temperature range: Y Version: –40°C to +105°C.
3See Terminology.
4Guaranteed by design and characterization, not production tested.
5Span = Maximum Output Frequency–Minimum Output Frequency.
6The absolute voltage on the input pins must not go more positive than VDD–1.75 V or more negative than +0.5 V.
AD7742–SPECIFICATIONS
AD7741/AD7742
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD7741/AD7742 features proprietary ESD protection circuitry, permanent dam-
age may occur on devices subjected to high energy electrostatic discharges. Therefore, proper
ESD precautions are recommended to avoid performance degradation or loss of functionality.
TIMING CHARACTERISTICS1, 2, 3NOTES
1Guaranteed by design and characterization, not production tested.
2All input signals are specified with tr = tf = 5 ns (10% to 90% of VDD) and timed from a voltage level of (VIL + VIH)/2.
3See Figure 1.
Specifications subject to change without notice.
(VDD = +4.75 V to +5.25 V; VREF = +2.5 V. All specifications TMIN to TMAX unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS1, 2(TA = +25°C unless otherwise noted)
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3␣V to +7 V
Analog Input Voltage to GND . . . . . . . . –5␣V to VDD + 0.3 V
Digital Input Voltage to GND . . . . . . . –0.3␣V to VDD + 0.3 V
Reference Input Voltage to GND . . . . –0.3 V to VDD + 0.3 V
fOUT to GND . . . . . . . . . . . . . . . . . . . . –0.3 V to VDD + 0.3 V
Operating Temperature Range
Automotive (Y Version) . . . . . . . . . . . . . . –40°C to +105°C
Industrial (B Version) . . . . . . . . . . . . . . . .–40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Plastic DIP Package
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . 450 mWJA Thermal Impedance (8 Lead) . . . . . . . . . . . . . 125°C/WJA Thermal Impedance (16 Lead) . . . . . . . . . . . . 117°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
SOIC Package
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . 450 mWJA Thermal Impedance (8 Lead) . . . . . . . . . . . . . 157°C/WJA Thermal Impedance (16 Lead) . . . . . . . . . . . . 125°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
NOTESStresses 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.Transient currents of up to 100 mA will not cause SCR latch-up.
ORDERING GUIDEAD7742BN
AD7742BR
CLKIN
fOUT
tHIGHt3Figure 1.Timing Diagram
AD7741 PIN FUNCTION DESCRIPTION6VIN
PIN CONFIGURATION
VDDfOUTGNDPD
CLKOUTVIN
CLKINREFIN/OUT
AD7741/AD7742
AD7742 PIN FUNCTION DESCRIPTIONPIN CONFIGURATION
fOUTPD
VDDGAIN
GNDVIN4VIN3VIN2
CLKOUTVIN1
CLKINREFIN
UNI/BIPREFOUT
