AD7816AR ,Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature SensorSingle- and 4-Channel, 9 ms, 10-Bit ADCsawith On-Chip Temperature SensorAD7816/AD7817/AD7818FUNCTIO ..
AD7816ARM ,Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature SensorApplicationsPRODUCT HIGHLIGHTS1. The devices have an on-chip temperature sensor that allows anaccur ..
AD7816ARM-REEL7 ,Temperature Sensor: 10-Bit ADC, Temperature Monitoring Only in an SOIC/µSOIC PackageSPECIFICATIONS (V = 2.7 V to 5.5 V, GND = 0 V, REF = 2.5 V unless otherwise noted)DD INParameter A ..
AD7816AR-REEL ,Temperature Sensor: 10-Bit ADC, Temperature Monitoring Only in an SOIC/µSOIC PackageGENERAL DESCRIPTIONmade. The measurable temperature range is –55°C to +125°C.The AD7818 and AD7817 ..
AD7816AR-REEL7 ,Temperature Sensor: 10-Bit ADC, Temperature Monitoring Only in an SOIC/µSOIC PackageFEATURES FUNCTIONAL BLOCK DIAGRAM10-Bit ADC with 9 s Conversion TimeVREFDDINOne (AD7818) and Four ..
AD7817AR ,Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature SensorSPECIFICATIONSDD INParameter A Version *B Version *S Version Units Test Conditions/CommentsDYNAMIC ..
ADM207AN ,0.1 uF, +5 V Powered CMOS RS-232 Drivers/ReceiversAPPLICATIONS8 R1 9 R1R1OUT INComputers5 R2 4 R2R2 INPeripherals OUTRS-232TTL/CMOS26 R3 27 R3Modems ..
ADM207AR ,0.1 uF, +5 V Powered CMOS RS-232 Drivers/Receiversapplications where printed circuit board space+12 V supplies. An internal +12 V to –12 V charge pum ..
ADM207ARS ,0.1 uF, +5 V Powered CMOS RS-232 Drivers/ReceiversAPPLICATIONS8 R1 9 R1R1OUT INComputers5 R2 4 R2R2 INPeripherals OUTRS-232TTL/CMOS26 R3 27 R3Modems ..
ADM207ARS ,0.1 uF, +5 V Powered CMOS RS-232 Drivers/Receiversapplications where ±12 V is not available. The ADM205,All members of the ADM2xx family, except the ..
ADM207EAN ,EMI/EMC Compliant, +-15 kV ESD Protected, RS-232 Line Drivers/ReceiversAPPLICATIONSCMOS EIA/TIA-23226 R3 27 R3R3Laptop Computers OUT INOUTPUTSINPUTS**Notebook Computers22 ..
ADM207EAR ,EMI/EMC Compliant, +-15 kV ESD Protected, RS-232 Line Drivers/ReceiversGENERAL DESCRIPTIONNOTES:The ADM2xxE is a family of robust RS-232 and V.28 interface * INTERNAL 40 ..
AD7816AR-AD7816ARM-AD7817AR-AD7817ARU-AD7818AR-AD7818ARM
Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor
REV.A
Single- and 4-Channel, 9 ms, 10-Bit ADCs
with On-Chip Temperature Sensor
FUNCTIONAL BLOCK DIAGRAMFEATURES
10-Bit ADC with 9 ms Conversion Time
One (AD7818) and Four (AD7817) Single-Ended Analog
Input Channels
The AD7816 Is a Temperature Measurement Only Device
On-Chip Temperature Sensor
Resolution of 0.258C628C Error from –408C to +858C
–558C to +1258C Operating Range
Wide Operating Supply Range
+2.7 V to +5.5 V
Inherent Track-and-Hold Functionality
On-Chip Reference (2.5 V 6 1%)
Over-Temperature Indicator
Automatic Power-Down at the End of a Conversion
Low Power Operation
4 mW at a Throughput Rate of 10 SPS
40 mW at a Throughput Rate of 1 kSPS
400 mW at a Throughput Rate of 10 kSPS
Flexible Serial Interface
APPLICATIONS
Ambient Temperature Monitoring (AD7816)
Thermostat and Fan Control
High Speed Microprocessor
Temperature Measurement and Control
Data Acquisition Systems with Ambient Temperature
Monitoring (AD7817 and AD7818)
Industrial Process Control
Automotive
Battery Charging Applications
GENERAL DESCRIPTIONThe AD7818 and AD7817 are 10-bit, single- and 4-channel
A/D converters with on-chip temperature sensor that can oper-
ate from a single 2.7 V to 5.5 V power supply. Each part con-
tains a 9 ms successive-approximation converter based around
a capacitor DAC, an on-chip temperature sensor with an accu-
racy of –2°C, an on-chip clock oscillator, inherent track-and-
hold functionality and an on-chip reference (2.5 V). The
AD7816 is a temperature monitoring only device in a SOIC/SOIC package.
The on-chip temperature sensor of the AD7817 and AD7818
can be accessed via 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
with a resolution of –0.25°C. See Measuring Temperature section
of the data sheet.
The AD7816, AD7817 and AD7818 have a flexible serial inter-
face that allows easy interfacing to most microcontrollers.
The interface is compatible with the Intel 8051, Motorola
SPI™ and QSPI™ protocols and National Semiconductors
MICROWIRE™ protocol. For more information refer to the
Serial Interface section of this data sheet.
The AD7817 is available in a narrow body 0.15" 16-lead Small
Outline IC (SOIC), in a 16-lead, Thin Shrink Small Outline
Package (TSSOP), while the AD7816/AD7818 come in an
8-lead Small Outline IC (SOIC) and an 8-lead microsmall
Outline IC (mSOIC).
PRODUCT HIGHLIGHTSThe devices have an on-chip temperature sensor that allows an
accurate measurement of the ambient temperature to be
made. The measurable temperature range is –55°C to +125°C.An over-temperature 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 over-
temperature register. The over-temperature indicator pin goes
logic low when a predetermined temperature is exceeded.The automatic power-down feature enables the AD7816,
AD7817 and AD7818 to achieve superior power perfor-
mance at slower throughput rates, e.g., 40 mW at 1 kSPS
throughput rate.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
AD7816/AD7817/AD7818
AD7817–SPECIFICATIONS1(VDD = +2.7 V to +5.5 V, GND = 0␣V, REFIN = +2.5␣V unless otherwise noted)
AD7816/AD78186–SPECIFICATIONS1(VDD = +2.7 V to +5.5 V, GND = 0 V, REFIN = +2.5 V unless
otherwise noted)CONVERSION RATE
AD7816/AD7817/AD7818
NOTES
*B and S Versions apply to AD7817 only. For operating temperature ranges, see Ordering Guide.AD7816 and AD7817 temperature sensors specified with external +2.5 V reference, AD7818 specified with on-chip reference. All other specifications with external
and on-chip reference (+2.5 V). For VDD = +2.7 V, TA = +85°C max and temperature sensor measurement error = –3°C.See Terminology.The accuracy of the temperature sensor is affected by reference tolerance. The relationship between the two is explained in the section titled Temperature Measure-
ment Error Due to Reference Error.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.All specifications are typical for AD7818 at temperatures above +85°C and with VDD greater than +3.6 V.Refers to the input current when the part is not converting. Primarily due to reverse leakage current in the ESD protection diodes.
Specifications subject to change without notice.
DIN/OUT
SCLK
RD/WR
CONVSTAGNDOTI
REFINVDDFigure 1.AD7816 Functional Block Diagram
Figure 2.AD7818 Functional Block Diagram
AD7816/AD7817/AD7818–SPECIFICATIONS1
TIMING CHARACTERISTICS1, 2NOTESSample tested during initial release and after any redesign or process change that may affect this parameter. All input signals are measured with tr = tf = 1␣ns (10% to
90% of +5 V) and timed from a voltage level of +1.6␣V.See Figures 16, 17, 20 and 21.These figures are measured with the load circuit of Figure 3. They are defined as the time required for DOUT to cross 0.8 V or 2.4 V for VDD = 5 V – 10% and 0.4 V
or 2 V for VDD = 3 V – 10%, as quoted on the specifications page of this data sheet.
4These times are derived from the measured time taken by the data outputs to change 0.5␣V when loaded with the circuit of Figure 3. The measured number is then
extrapolated back to remove the effects of charging or discharging the 50 pF capacitor. This means that the times quoted in the timing characteristics are the true bus
relinquish times of the part and as such are independent of external bus loading capacitances.
Specifications subject to change without notice.
1.6V
IOL200mA
200mAIOL
OUTPUT
PINFigure 3.Load Circuit for Access Time and Bus Relinquish Time
(VDD = +2.7 V to +5.5 V, GND = 0␣V, REFIN = +2.5␣V. All specifications TMIN to TMAX unless
otherwise noted)
AD7816/AD7817/AD7818
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 AD7816/AD7817/AD7818 feature 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.
ABSOLUTE MAXIMUM RATINGS1(TA = +25°C unless otherwise noted)
VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3␣V to +7␣V
VDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3␣V to +7␣V
Analog Input Voltage to AGND
VIN1 to VIN4 . . . . . . . . . . . . . . . . . . . –0.3 V to VDD + 0.3 V
Reference Input Voltage to AGND2 . . . –0.3 V to VDD + 0.3␣V
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
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
TSSOP, Power Dissipation . . . . . . . . . . . . . . . . . . . . 450 mWJA 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 mWJA 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 mWJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 157°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
ORDERING GUIDESOIC Package, Power Dissipation . . . . . . . . . . . . . . 450 mWJA 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 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 condi-
tions 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.
REFINVDD
AD7816/AD7817
AD7817 PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATION
SOIC/TSSOP
CONVST
DOUT
DIN
SCLK
RD/WR
BUSY
O T I
VIN4
VDD
DGNDAGND
REFIN
VIN1
VIN2VIN3
AD7816/AD7817/AD7818
AD7816 AND AD7818 PIN FUNCTION DESCRIPTIONS
PIN CONFIGURATIONS
SOIC/mSOIC (AD7816)
CONVST
DIN/OUT
SCLK
RD/WR
VDD
AGND
REFIN
OTI
SOIC/mSOIC (AD7818)
CONVST
DIN/OUT
SCLK
RD/WR
VDD
AGND
VIN
OTI
TERMINOLOGY
Signal to (Noise + Distortion) RatioThis is the measured ratio of signal to (Noise + Distortion) at
the output of the A/D converter. The signal is the rms amplitude
of the fundamental. Noise is the rms sum of all nonfundamen-
tal signals up to half the sampling frequency (fS/2), excluding dc.
The ratio is dependent upon the number of quantization levels
in the digitization process; the more levels, the smaller the
quantization noise. The theoretical Signal to (Noise + Distortion)
Ratio for an ideal N-bit converter with a sine wave input is
Total Harmonic DistortionTotal harmonic distortion (THD) is the ratio of the rms sum of
harmonics to the fundamental. For the AD7891 it is defined as:
where V1 is the rms amplitude of the fundamental and V2, V3,
V4, V5 and V6 are the rms amplitudes of the second through the
sixth harmonics.
Peak Harmonic or Spurious NoisePeak harmonic or spurious noise is defined as the ratio of the
rms value of the next largest component in the ADC output
spectrum (up to fS/2 and excluding dc) to the rms value of the
fundamental. Normally, the value of this specification is deter-
mined by the largest harmonic in the spectrum, but for parts
where the harmonics are buried in the noise floor, it will be a
noise peak.
Intermodulation DistortionWith inputs consisting of sine waves at two frequencies, fa and
fb, any active device with nonlinearities will create distortion
products at sum and difference frequencies of mfa – nfb where
m, n = 0, 1, 2, 3, etc. Intermodulation terms are those for which
neither m nor n are equal to zero. For example, the second
order terms include (fa + fb) and (fa – fb), while the third order
terms include (2fa + fb), (2fa – fb), (fa + 2fb) and (fa – 2fb).
