AD7416 ,Temperature to Digital Converter, I2C, 10-Bit Resolution, -55癈 to +125癈, ?癈 AccuracySPECIFICATIONS (V = 2.7 V to 5.5 V, GND = 0 V, REF = 2.5 V, unless otherwise noted.)DD IN1Parameter ..
AD7416AR ,10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)SPECIFICATIONS wise noted)1Parameter A Version B Version Units Test Conditions/CommentsDC ACCURACY ..
AD7416ARM ,10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)CHARACTERISTICSSerial Clock Period, t 2.5 m s See Figure 11Data In Setup Time to SCL High, t 50 ns ..
AD7416ARMZ-REEL7 , 10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
AD7416ARZ-REEL , 10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
AD7416ARZ-REEL7 , 10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
ADF4117BRU ,RF PLL Frequency SynthesizersCHARACTERISTICSRF Input Frequency See Figure 22 for Input CircuitADF4116 45/550 45/550 MHz min/maxA ..
ADF4118BRU ,RF PLL Frequency SynthesizersFEATURESThe ADF4116 family of frequency synthesizers can be usedADF4116: 550 MHzto implement local ..
ADF4118BRU-REEL7 , RF PLL Frequency Synthesizers
ADF4118BRU-REEL7 , RF PLL Frequency Synthesizers
ADF4153 ,Fractional-N Frequency SynthesizerSpecifications subject to change without notice. No license is granted by implication www.analog.c ..
ADF4153BCP ,Fractional-N Frequency SynthesizerCHARACTERISTICS See Figure 16 for input circuit. 2REFIN Input Frequency 10/250 MHz min/max For f ..
AD7416
Temperature to Digital Converter, I2C, 10-Bit Resolution, -55癈 to +125癈, ?癈 Accuracy
REV. E
10-Bit Digital Temperature Sensor (AD7416) and
Four Single-Channel ADCs (AD7417/AD7418)
FUNCTIONAL BLOCK DIAGRAMS
REFINVDD
OTI
SCL
SDAA1A0CONVST
AIN1
AIN2
AIN3
AIN4NCGND
NC = NO CONNECT
VDD
OTI
SCL
SDA
AIN1
GND
REFIN
CONVST
FEATURES
10-Bit ADC with 15 �s and 30 �s Conversion Times
Single and Four Single-Ended Analog Input Channels
On-Chip Temperature Sensor: –55�C to +125�C
On-Chip Track-and-Hold
Overtemperature Indicator
Automatic Power-Down at the End of a Conversion
Wide Operating Supply Range: 2.7 V to 5.5 V2C® Compatible Serial Interface
Selectable Serial Bus Address Allows Connection of up
to Eight AD7416/AD7417s to a Single Bus
AD7416 is a Superior Replacement for LM75
APPLICATIONS
Data Acquisition with Ambient Temperature Monitoring
Industrial Process Control
Automotive
Battery-Charging Applications
Personal Computers
GENERAL DESCRIPTIONThe AD7417 and AD7418 are 10-bit, 4-channel and single-
channel A/D converters with an on-chip temperature sensor
that can operate from a single 2.7 V to 5.5 V power supply.
The devices contain a 15 µs successive-approximation converter,
a 5-channel multiplexer, a temperature sensor, a clock oscillator,
a track-and-hold, and a reference (2.5 V). The AD7416 is a
temperature-monitoring-only device in an 8-lead package.
The temperature sensor on the parts can be accessed via multi-
plexer Channel 0. When Channel 0 is selected and a conversion
is initiated, the resulting ADC code at the end of the conversion
gives a measurement of the ambient temperature (±1°C @ 25°C).
On-chip registers can be programmed with high and low tem-
perature limits, and an open-drain overtemperature indicator
(OTI) output is provided, which becomes active when a pro-
grammed limit is exceeded.
A Configuration Register allows programming of the sense of
the OTI output (active high or active low) and its Operating
Mode (comparator or interrupt). A programmable fault queue
counter allows the number of out of limit measurements that
must occur before triggering the OTI output to be set to prevent
spurious triggering of the OTI output in noisy environments.
(continued on page 7)2C is a registered trademark of Philips Corporation.
AD7416/AD7417/AD7418
AD7417/AD7418–SPECIFICATIONS(VDD = 2.7 V to 5.5 V, GND = 0V, REFIN = 2.5V, unless otherwise noted.)
AD7416/AD7417/AD7418NOTESB Version applies to AD7417 only with temperature range of –40°C to +85°C. A Version temperature range is –55°C to +125°C. For VDD = 2.7 V, TA = 85°C max
and temperature sensor measurement error = ±3°C.See Terminology.Refers to the input current when the part is not converting. Primarily due to reverse leakage current in the ESD protection diodes.Sample tested during initial release and after any redesign or process change that may affect this parameter.On-chip reference shuts down when external reference is applied.The accuracy of the temperature sensor is affected by reference tolerance. The relationship between the two is explained in the Temperature Sensor section.
Specifications subject to change without notice.
(VDD = 2.7 V to 5.5 V, GND = 0V, REFIN = 2.5V, unless otherwise noted.)DIGITAL INPUTS
DIGITAL OUTPUTS
AC ELECTRICAL CHARACTERISTICS
NOTESFor VDD = 2.7 V to 3 V, TA max = 85°C and accuracy = ±3°C.Sample tested during initial release and after any redesign or process change that may affect this parameter.
Specifications subject to change without notice.
AD7416–SPECIFICATIONS
AD7416/AD7417/AD7418
AD7417 PIN FUNCTION DESCRIPTION
AD7417 PIN CONFIGURATION
SOIC/TSSOP
AD7416 PIN FUNCTION DESCRIPTION4GND
5A2Digital Input. The highest programmable bit of the serial bus address.
6A1Digital Input. The middle programmable bit of the serial bus address.
7A0Digital Input. The lowest programmable bit of the serial bus address.
AD7418 PIN FUNCTION DESCRIPTION4GND
5AIN
7VDD
AD7416 PIN CONFIGURATION
SOIC/MSOP
AD7418 PIN CONFIGURATION
SOIC/MSOP
AD7416/AD7417/AD7418
ORDERING GUIDE
ABSOLUTE MAXIMUM RATINGS1(TA = 25°C, unless otherwise noted.)
VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +7V
VDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +7V
Analog Input Voltage to AGND
AIN1 to AIN4 . . . . . . . . . . . . . . . . . . . –0.3 V to VDD + 0.3 V
Reference Input Voltage to AGND2 . . . –0.3 V to VDD + 0.3V
Digital Input Voltage to DGND . . . . . . –0.3 V to VDD + 0.3 V
Digital Output Voltage to DGND . . . . . –0.3 V to VDD + 0.3 V
Operating Temperature Range
A Version . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
B Version . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
TSSOP, Power Dissipation . . . . . . . . . . . . . . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 120°C/W
Lead Temperature, Soldering . . . . . . . . . . . . . . . . . .260°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . .215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . .220°C
16-Lead SOIC Package, Power Dissipation . . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 100°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
8-Lead SOIC Package, Power Dissipation . . . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 157°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
MSOP Package, Power Dissipation . . . . . . . . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 206°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 permanent
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.If the reference input voltage is likely to exceed VDD by more than 0.3V (e.g.,
during power-up) and the reference is capable of supplying 30mA or more, it is
recommended to use a clamping diode between the REFIN pin and VDD pin. The
diagram below shows how the diode should be connected.
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 AD7416/AD7417/AD7418 features proprietary ESD protection circuitry, perma-
nent 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.
(continued from page 1)
An I2C compatible serial interface allows the AD7416/AD7417/
AD7418 registers to be written to and read back. The three LSBs
of the AD7416/AD7417’s serial bus address can be selected,
which allows up to eight AD7416/AD7417s to be connected to
a single bus.
The AD7417 is available in a narrow body, 0.15'', 16-lead, small
outline IC (SOIC) and in a 16-lead, thin shrink, small outline
package (TSSOP). The AD7416 and AD7418 are available in
8-lead SOIC and MSOP packages.
PRODUCT HIGHLIGHTSThe AD7416/AD7417/AD7418 have an on-chip tempera-
ture sensor that allows an accurate measurement of the
ambient temperature (±1°C @ 25°C, ±2°C overtemperature)
to be made. The measurable temperature range is –55°C to
+125°C. An overtemperature indicator is implemented by
carrying out a digital comparison of the ADC code for
Channel 0 (temperature sensor) with the contents of the
on-chip Overtemperature Register.The AD7417 offers a space-saving 10-bit A/D solution with
four external voltage input channels, an on-chip temperature
sensor, an on-chip reference, and clock oscillator.The automatic power-down feature enables the AD7416/
AD7417/AD7418 to achieve superior power performance.
At slower throughput rates, the part can be programmed to
operate in a low power shutdown mode, allowing further
savings in power consumption.
TERMINOLOGY
Relative AccuracyRelative accuracy or endpoint nonlinearity is the maximum
deviation from a straight line passing through the endpoints of
the ADC transfer function.
Differential NonlinearityThis is the difference between the measured and the ideal
1LSB change between any two adjacent codes in the ADC.
Offset ErrorThis is the deviation of the first code transition (0000...000)
to (0000...001) from the ideal, i.e., GND + 1 LSB.
Offset Error MatchThis is the difference in offset error between any two channels.
Gain ErrorThis is the deviation of the last code transition (1111...110)
to (1111...111) from the ideal, i.e., VREF – 1 LSB, after the
offset error has been adjusted out.
Gain Error MatchThis is the difference in gain error between any two channels.
Track-and-Hold Acquisition TimeTrack-and-hold acquisition time is the time required for the
output of the track-and-hold amplifier to reach its final value,
within ±1/2 LSB, after the end of conversion (the point at
which the track-and-hold returns to track mode). It also applies
to situations where a change in the selected input channel takes
place or where there is a step input change on the input voltage
applied to the selected AIN input of the AD7417 or AD7418. It
means that the user must wait for the duration of the track-
and-hold acquisition time after the end of conversion or after a
channel change/step input change to AIN before starting another
conversion, to ensure that the part operates to specification.
CIRCUIT INFORMATIONThe AD7417 and AD7418 are single-channel and four-channel,
15 µs conversion time, 10-bit A/D converters with on-chip
temperature sensor, reference, and serial interface logic functions
on a single chip. The AD7416 has no analog input channel and
is intended for temperature measurement only. The A/D converter
section consists of a conventional successive-approximation
converter based around a capacitor DAC. The AD7416, AD7417,
and AD7418 are capable of running on a 2.7 V to 5.5 V power
supply, and the AD7417 and AD7418 accept an analog input
range of 0 V to +VREF. The on-chip temperature sensor allows
an accurate measurement of the ambient device temperature to
be made. The working measurement range of the temperature
sensor is –55°C to +125°C. The parts require a 2.5 V reference
that can be provided from the part’s own internal reference or
from an external reference source.
CONVERTER DETAILSConversion is initiated on the AD7417/AD7418 by pulsing the
CONVST input. The conversion clock for the part is internally
generated so no external clock is required except when reading
from and writing to the serial port. The on-chip track-and-hold
goes from Track to Hold Mode and the conversion sequence is
started on the falling edge of the CONVST signal. A conversion
is also initiated in the Automatic Conversion Mode every time a
read or write operation to the AD7416/AD7417/AD7418 takes
place. In this case, the internal clock oscillator (which runs the
automatic conversion sequence) is restarted at the end of the read
or write operation. The track-and-hold goes into hold approxi-
mately 3 µs after the read or write operation is complete and a
conversion is then initiated. The result of the conversion is
available either 15µs or 30µs later, depending on whether an
analog input channel or the temperature sensor is selected. The
track-and-hold acquisition time of the AD7417/AD7418 is 400 ns.
A temperature measurement is made by selecting the Channel 0
of the on-chip mux and carrying out a conversion on this
channel. A conversion on Channel 0 takes 30 µs to complete.
Temperature measurement is explained in the Temperature
Measurement section of this data sheet.
The on-chip reference is not available to the user, but REFIN
can be overdriven by an external reference source (2.5 V only).
All unused analog inputs should be tied to a voltage within the
nominal analog input range to avoid noise pickup. For mini-
mum power consumption, the unused analog inputs should be
tied to GND.
AD7416/AD7417/AD7418
TYPICAL CONNECTION DIAGRAMFigure 2 shows a typical connection diagram for the AD7417.
Using the A0, A1, and A2 pins allows the user to select from up
to eight AD7417s on the same serial bus, if desired. An external
2.5 V reference can be connected at the REFIN pin. If an external
reference is used, a 10 µF capacitor should be connected between
REFIN and GND. SDA and SCL form the 2-wire I2C compatible
interface. For applications where power consumption is of
concern, the automatic power-down at the end of a conversion
should be used to improve power performance. See Operating
Modes section of this data sheet.
Figure 2.Typical Connection Diagram
ANALOG INPUTSFigure 3 shows an equivalent circuit of the analog input struc-
ture of the AD7417 and AD7418. The two diodes, D1 and D2,
provide ESD protection for the analog inputs. Care must be
taken to ensure that the analog input signal never exceeds the
supply rails by more than 200 mV. This will cause these diodes
to become forward-biased and start conducting current into the
substrate. The maximum current these diodes can conduct
without causing irreversible damage to the part is 20 mA. The
capacitor C2 in Figure 3 is typically about 4 pF and can prima-
rily be attributed to pin capacitance. The resistor R1 is a
lumped component made up of the on resistance of a multi-
plexer and a switch. This resistor is typically about 1 kΩ. The
capacitor C1 is the ADC sampling capacitor and has a capaci-
tance of 3 pF.
Figure 3.Equivalent Analog Input Circuit
ON-CHIP REFERENCEthe REFIN pin to analog ground. This causes SW1 (see Figure 4)
to open and the reference amplifier to power up during a
conversion. Therefore, the on-chip reference is not available
externally. An external 2.5 V reference can be connected to the
REFIN pin. This has the effect of shutting down the on-chip
reference circuitry.
Figure 4.On-Chip Reference
TEMPERATURE MEASUREMENTA common method of measuring temperature is to exploit the
negative temperature coefficient of a diode, or the base-emitter
voltage of a transistor, operated at a constant current. Unfortu-
nately, this technique requires calibration to null out the effect
of the absolute value of VBE, which varies from device to device.
The technique used in the AD7416/AD7417/AD7418 is to
measure the current change in VBE when the device is operated
at two different currents.
This is given by:
where:
K is Boltzmann’s constant.
q is the charge on the electron (1.6 � 10-19 Coulombs).
T is the absolute temperature in Kelvins.
N is the ratio of the two currents.
Figure 5.Temperature Measurement Technique
Figure 5 shows the method the AD7416/AD7417/AD7418 uses to
measure the device temperature. To measure �VBE, the sensor (sub-
