Datasheet

ManualsBrandsANALOG DEVICES ManualsPMICsADT7316ARQZ-REEL7

±0.5°C Accurate Digital Temperature Sensor

and Quad Voltage Output 12-/10-/8-Bit DACs

ADT7316/ADT7317/ADT7318

Rev. B

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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

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FEATURES

ADT7316—four 12-bit DACs

ADT7317—four 10-bit DACs

ADT7318—four 8-bit DACs

Buffered voltage output

Guaranteed monotonic by design over all codes

10-bit temperature-to-digital converter

Temperature range: −40°C to +120°C

Temperature sensor accuracy of ±0.5°C

Supply range: 2.7 V to 5.5 V

DAC output range: 0 V to 2 V

REF

Power-down current : <10 μA

Internal 2.28 V

REF

option

Double-buffered input logic

Buffered/unbuffered reference input option

Power-on reset to 0 V

Simultaneous update of outputs (

LDAC

function)

On-chip rail-to-rail output buffer amplifier

C®-, SMBus-, SPI®-, QSPI™-, MICROWIRE™-, and DSP-

compatible 4-wire serial interface

SMBus packet error checking (PEC) compatible

16-lead QSOP

APPLICATIONS

Portable battery-powered instruments

Personal computers

Telecommunications systems

Electronic test equipment

Domestic appliances

Process control

PIN CONFIGURATION

OUT

-A

REF

-AB

D+

GND

OUT

-B

OUT

-D

REF

-CD

SCL/SCLK

INT/INT

D– LDAC

DOUT/ADD

SDA/DIN

OUT

-C

TOP VIEW

(Not to Scale)

ADT7316/

ADT7317/

ADT7318

02661-006

Figure 1.

GENERAL DESCRIPTION

The ADT7316/ADT7317/ADT7318

combine a 10-bit

temperature-to-digital converter and a quad 12-/10-/8-bit

DAC, respectively, in a 16-lead QSOP. This includes a band

gap temperature sensor and a 10-bit ADC to monitor and

digitize the temperature reading to a resolution of 0.25°C. The

ADT7316/ ADT7317/ADT7318 operate from a single 2.7 V to

5.5 V supply. The output voltage of the DAC ranges from 0 V

to 2 V

REF

, with an output voltage settling time of 7 μs typically.

The ADT7316/ ADT7317/ADT7318 provide two serial inter-

face options, a 4-wire serial interface that is compatible with

SPI, QSPI, MICROWIRE, and DSP interface standards, and a

2-wire SMBus/I

C interface. They feature a standby mode that

is controlled via the serial interface.

The reference for the four DACs is derived either internally

or from two reference pins (one per DAC pair). The outputs

of all DACs may be updated simultaneously using the software

LDAC function or external

LDAC

pin. The ADT7316/ADT7317/

ADT7318 incorporate a power-on-reset circuit that ensures the

DAC output powers up to 0 V and remains there until a valid

write takes place.

The ADT7316/ADT7317/ADT7318 wide supply voltage range,

low supply current, and SPI-/I

C-compatible interface make

them ideal for a variety of applications, including personal

computers, office equipment, and domestic appliances.

Protected by the following U.S. patent numbers: 5,764,174; 5,867,012;

6,097,239; 6,169,442.

Summary of content (44 pages)

PAGE 1
±0.5°C Accurate Digital Temperature Sensor and Quad Voltage Output 12-/10-/8-Bit DACs ADT7316/ADT7317/ADT7318 PIN CONFIGURATION ADT7316—four 12-bit DACs ADT7317—four 10-bit DACs ADT7318—four 8-bit DACs Buffered voltage output Guaranteed monotonic by design over all codes 10-bit temperature-to-digital converter Temperature range: −40°C to +120°C Temperature sensor accuracy of ±0.5°C Supply range: 2.7 V to 5.5 V DAC output range: 0 V to 2 VREF Power-down current : <10 μA Internal 2.
PAGE 2
ADT7316/ADT7317/ADT7318 TABLE OF CONTENTS Features .............................................................................................. 1 Output Amplifier........................................................................ 21 Applications....................................................................................... 1 Thermal Voltage Output ........................................................... 21 Pin Configuration...............................................................
PAGE 3
ADT7316/ADT7317/ADT7318 SPECIFICATIONS Temperature ranges for A version: –40°C to +120°C. VDD = 2.7 V to 5.5 V, GND = 0 V, REFIN = 2.25 V, unless otherwise noted. Table 1. Parameter 1 DAC DC PERFORMANCE 2 , 3 ADT7318 Resolution Relative Accuracy Differential Nonlinearity ADT7317 Resolution Relative Accuracy Differential Nonlinearity ADT7316 Resolution Relative Accuracy Differential Nonlinearity Offset Error Gain Error Lower Dead Band Min Upper Dead Band Unit Conditions/Comments 8 ±0.15 ±0.02 ±1 ±0.
PAGE 4
ADT7316/ADT7317/ADT7318 Parameter 1 CONVERSION TIMES Slow ADC VDD Min Internal Temperature External Temperature Fast ADC VDD Internal Temperature External Temperature Typ Max Unit Conditions/Comments Single channel mode. 11.4 712 11.4 712 24.22 1.51 ms μs ms μs ms ms Averaging (16 samples) on. Averaging off. Averaging (16 samples) on. Averaging off. Averaging (16 samples) on Averaging off. 712 44.5 2.14 134 14.25 890 μs μs ms μs ms μs Averaging (16 samples) on. Averaging off.
PAGE 5
ADT7316/ADT7317/ADT7318 Parameter1 DIGITAL OUTPUT Output High Voltage, VOH Output Low Voltage, VOL Output High Current, IOH Output Capacitance, COUT INT/INT Output Saturation Voltage I2C TIMING CHARACTERISTICS7, 8 Serial Clock Period, t1 Data In Setup Time to SCL High, t2 Data Out Stable After SCL Low, t3 SDA Low Setup Time to SCL Low (Start Condition), t4 SDA High Hold Time After SCL High (Stop Condition), t5 SDA and SCL Fall Time, t6 SDA and SCL Rise Time, t6 SPI TIMING CHARACTERISTICS10, 11 CS to SCLK Se
PAGE 6
ADT7316/ADT7317/ADT7318 GAIN ERROR + OFFSET ERROR OUTPUT VOLTAGE NEGATIVE OFFSET ERROR DAC CODE ACTUAL IDEAL LOWER DEAD BAND CODES AMPLIFIER FOOTROOM 02661-007 NEGATIVE OFFSET ERROR Figure 2. DAC Transfer Function with Negative Offset GAIN ERROR + OFFSET ERROR UPPER DEAD BAND CODES OUTPUT VOLTAGE POSITIVE OFFSET ERROR DAC CODE 02661-008 ACTUAL IDEAL FULL SCALE Figure 3. DAC Transfer Function with Positive Offset (VREF = VDD) t1 SCL t4 t5 t2 SDA DATA IN t6 Figure 4.
PAGE 7
ADT7316/ADT7317/ADT7318 200µA 1.6V CL 50pF 200µA 02661-004 TO OUTPUT PIN IOL IOH Figure 5. Load Circuit for Access Time and Bus Relinquish Time VDD 4.7kΩ 4.7kΩ 200pF 02661-005 TO DAC OUTPUT Figure 6. Load Circuit for DAC Outputs CS t1 t2 t7 SCLK DIN D7 D6 D5 t6 t5 D4 D3 D2 D1 t8 D0 X X X X X X X X D5 D4 D3 D2 D1 D0 t4 DOUT X X X X X X X X D7 D6 Figure 7. SPI Bus Timing Diagram Rev.
PAGE 8
ADT7316/ADT7317/ADT7318 FUNCTIONAL BLOCK DIAGRAM D– 8 ANALOG MUX A-TO-D CONVERTER VDD SENSOR VDD VALUE REGISTER LIMIT COMPARATOR TLOW LIMIT REGISTERS VDD LIMIT REGISTERS CONTROL CONFIG. 1 REGISTER EXTERNAL TEMPERATURE VALUE REGISTER DAC A REGISTERS STRING DAC A 2 VOUT-A DAC B REGISTERS STRING DAC B 1 VOUT-B DAC C REGISTERS STRING DAC C 16 VOUT-C DAC D REGISTERS STRING DAC D 15 VOUT-D CONTROL CONFIG. 2 REGISTER CONTROL CONFIG.
PAGE 9
ADT7316/ADT7317/ADT7318 DAC AC CHARACTERISTICS Guaranteed by design and characterization, but not production tested. VDD = 2.7 V to 5.5 V; RL = 4.7 kΩ to GND; CL = 200 pF to GND; 4.7 kΩ to VDD. All specifications TMIN to TMAX, unless otherwise noted. Table 2.
PAGE 10
ADT7316/ADT7317/ADT7318 ABSOLUTE MAXIMUM RATINGS Table 3.
PAGE 11
ADT7316/ADT7317/ADT7318 VOUT-B 1 16 VOUT-C VOUT-A 2 15 VOUT-D VREF -AB 3 CS 4 GND 5 VDD 6 D+ D– ADT7316/ ADT7317/ ADT7318 14 VREF -CD 13 SCL/SCLK TOP VIEW (Not to Scale) 12 SDA/DIN 11 DOUT/ADD 7 10 INT/INT 8 9 LDAC 02661-006 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 9. Pin Configuration QSOP Table 5. Pin Function Descriptions Pin No.
PAGE 12
ADT7316/ADT7317/ADT7318 TERMINOLOGY Relative Accuracy Relative accuracy or integral nonlinearity (INL) is a measure of the maximum deviation, in LSBs, from a straight line passing through the endpoints of the DAC transfer function. Typical INL vs. code plots can be seen in Figure 10, Figure 11, and Figure 12. Differential Nonlinearity (DNL) Differential nonlinearity is the difference between the measured change and the ideal 1 LSB change between any two adjacent codes.
PAGE 13
ADT7316/ADT7317/ADT7318 Multiplying Bandwidth The amplifiers within the DAC have a finite bandwidth. The multiplying bandwidth is a measure of this. A sine wave on the reference (with full-scale code loaded to the DAC) appears on the output. The multiplying bandwidth is the frequency at which the output amplitude falls to 3 dB below the input. Total Harmonic Distortion This is the difference between an ideal sine wave and its attenuated version using the DAC.
PAGE 14
ADT7316/ADT7317/ADT7318 TYPICAL PERFORMANCE CHARACTERISTICS 0.20 0.10 0.08 0.15 0.06 0.10 DNL ERROR (LSB) 0 –0.05 –0.10 0 –0.02 –0.04 –0.06 –0.15 50 100 150 DAC CODE 200 250 –0.10 0 0.6 0.3 0.4 0.2 0.2 0.1 0 –0.2 200 400 600 DAC CODE 800 1000 1000 4000 –0.1 –0.3 02661-010 0 0 1.0 2.0 0.8 1.5 0.6 1.0 0.4 DNL ERROR (LSB) 2.5 0.5 0 –0.5 –0.2 –1.5 –0.6 –2.0 –0.8 1000 1500 2000 2500 DAC CODE 3000 800 0 –0.4 500 400 600 DAC CODE 0.2 –1.0 0 200 Figure 14.
PAGE 15
ADT7316/ADT7317/ADT7318 0.30 10 0.25 INL WCP OFFSET ERROR 5 0.20 0 ERROR (LSB) 0.10 0.05 DNL WCP 0 VREF = 2.25V –5 –10 DNL WCN GAIN ERROR –15 –0.05 INL WCN 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VREF (V) –20 02661-015 –0.10 1.0 2.7 Figure 16. ADT7318 INL Error and DNL Error vs. VREF 3.3 3.6 4.0 VDD (V) 4.5 5.0 02661-018 ERROR (LSB) 0.15 5.5 Figure 19. Offset Error and Gain Error vs. VDD 2.505 0.14 INL WCP 0.12 2.500 SOURCE CURRENT 0.10 2.
PAGE 16
ADT7316/ADT7317/ADT7318 2.00 1.8 ADC OFF, DAC OUTPUTS AT 0V 1.6 1.4 DAC OUTPUT (V) ICC (mA) 1.95 1.90 1.85 1.2 1.0 0.8 0.6 0.4 1.80 3.1 3.5 3.9 4.3 VCC (V) 4.7 5.1 5.5 0 02661-021 1.75 2.7 0 2 4 6 8 10 TIME (µs) 02661-024 0.2 Figure 25. Exiting Power-Down to Midscale Figure 22. Supply Current vs. Supply Voltage @25°C 7 0.4700 0.4695 6 0.4690 0.4685 DAC OUTPUT (V) ICC (µA) 5 4 3 0.4680 0.4675 0.4670 0.4665 2 0.4660 1 3.9 4.3 VCC (V) 4.7 5.1 5.5 0.
PAGE 17
ADT7316/ADT7317/ADT7318 0 1.5 VDD = 5V TA = 25°C EXTERNAL TEMPERATURE @ 5V TEMPERATURE ERROR (°C) FULL-SCALE ERROR (mV) –2 –4 –6 –8 1.0 INTERNAL TEMPERATURE @ 3.3V 0.5 0 –0.5 –10 EXTERNAL TEMPERATURE @ 3.3V 1 2 3 4 –1.0 02661-027 –12 5 VREF (V) VDD = 3.3V TEMPERATURE = 25°C TEMPERATURE ERROR (°C) 10 2.327 2.326 2.325 2.324 2.323 D+ TO GND 5 0 –5 D+ TO VCC –10 –15 1 2 3 TIME (µs) 4 5 –25 02661-028 0 Figure 29.
PAGE 18
ADT7316/ADT7317/ADT7318 10 140 VDD = 3.3V COMMON-MODE VOLTAGE = 100mV EXTERNAL TEMPERATURE 120 4 2 0 –2 100 200 300 400 NOISE FREQUENCY (Hz) 500 600 60 40 0 02661-033 1 TEMPERATURE OF ENVIRONMENT CHANGED HERE 0 10 20 30 TIME (s) 40 50 60 Figure 37. Temperature Sensor Response to Thermal Shock Figure 34. External Temperature Error vs. Common-Mode Noise Frequency 0 70 VDD = 3.
PAGE 19
ADT7316/ADT7317/ADT7318 THEORY OF OPERATION Directly after the power-up calibration routine, the ADT7316/ ADT7317/ADT7318 go into idle mode. In this mode, the device is not performing any measurements and is fully powered up. All four DAC outputs are at 0 V. To begin monitoring, write to the Control Configuration 1 register (Address 0x18), and set Bit C0 = 1. The ADT7316/ ADT7317/ADT7318 go into their power-up default measurement mode, which is round robin.
PAGE 20
ADT7316/ADT7317/ADT7318 FUNCTIONAL DESCRIPTION—VOLTAGE OUTPUT DIGITAL-TO-ANALOG CONVERTERS DIGITAL-TO-ANALOG SECTION The ADT7316/ADT7317/ADT7318 have four resistor-string DACs fabricated on a CMOS process, with resolutions of 12, 10, and 8 bits, respectively. They contain four output buffer amplifiers and are written to via an I2C serial interface or an SPI serial interface. See the Serial Interface Selection section for more information.
PAGE 21
ADT7316/ADT7317/ADT7318 VDD I N×I IBIAS OPTIONAL CAPACITOR, UP TO 3nF MAX. CAN BE ADDED TO IMPROVE HIGH FREQUENCY NOISE REJECTION IN NOISY ENVIRONMENTS D+ VOUT+ C1 TO ADC D– LOW-PASS FILTER fC = 65kHz BIAS DIODE VOUT– 02661-041 REMOTE SENSING TRANSISTOR (2N3906) Figure 41. Signal Conditioning for External Diode Temperature Sensors proportional to output voltage. Each time a temperature measurement is taken, the DAC output is updated.
PAGE 22
ADT7316/ADT7317/ADT7318 Negative Temperatures Table 7. Thermal Voltage Output (0 V to 2 VREF-AB) Offset Register Code (dec) = (0 V Temp) + 128 where D7 of Offset Register Code is set to 1 for negative temperatures. Example: Offset Register Code (dec ) = ( −40 ) + 128 = 88d = 0 x58 Because a negative temperature is input into the equation, DB7 (MSB) of the Offset Register Code is set to 1.
PAGE 23
ADT7316/ADT7317/ADT7318 FUNCTIONAL DESCRIPTION—MEASUREMENT TEMPERATURE SENSOR The ADT7316/ADT7317/ADT7318 contain an ADC with special input signal conditioning to enable operation with external and on-chip diode temperature sensors. When the ADT7316/ ADT7317/ADT7318 are operating in single-channel mode, the ADC continually processes the measurement taken on one channel only. This channel is preselected by Bit C0 and Bit C1 in the Control Configuration 2 register (Address 0x19).
PAGE 24
ADT7316/ADT7317/ADT7318 VDD Table 8. VDD Data Format, VREF = 2.28 V Digital Output Binary 01 0110 1110 01 1011 0111 10 0000 0000 10 0100 1001 10 1001 0010 10 1101 1100 11 0010 0101 11 0110 1110 11 1011 0111 11 1111 1111 Hex 16E 1B7 200 249 292 2DC 325 36E 3B7 3FF N×I IBIAS VOUT+ TO ADC INTERNAL SENSE TRANSISTOR BIAS DIODE VOUT– 02661-043 VDD Value (V) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 I Figure 44.
PAGE 25
ADT7316/ADT7317/ADT7318 The technique used in the ADT7316/ADT7317/ADT7318 is to measure the change in VBE when the device is operated at two different currents. This is given by ΔVBE = KT/q × ln (N) where: K is Boltzmann’s constant. q is the charge on the carrier. T is the absolute temperature in Kelvin. N is the ratio of the two currents. Figure 41 shows the input signal conditioning used to measure the output of an external temperature sensor.
PAGE 26
ADT7316/ADT7317/ADT7318 INTERRUPTS The measured results from the internal temperature sensor, external temperature sensor, and the VDD pin are compared with the THIGH/VHIGH (greater than comparison) and TLOW/VLOW (less than or equal to comparison) limits. An interrupt occurs if the measurement exceeds or equals the limit registers. These limits are stored in on-chip registers. Note that the limit registers are 8 bits long, while the conversion results are 10 bits long.
PAGE 27
ADT7316/ADT7317/ADT7318 REGISTERS The ADT7316/ADT7317/ADT7318 contain registers that are used to store the results of external and internal temperature measurements, VDD value measurements, high and low temperature and supply voltage limits. They also set output DAC voltage levels, configure multipurpose pins, and generally control the device. A description of these registers follows. The register map is divided into registers of 8 bits.
PAGE 28
ADT7316/ADT7317/ADT7318 REGISTER DESCRIPTIONS Table 15. Internal Temperature/VDD LSBs The bit maps in this section show the register default settings at power-up, unless otherwise noted. D7 N/A N/A Interrupt Status 1 Register (Read-Only) [Address 0x00] This 8-bit, read-only register reflects the status of some of the interrupts that can cause the INT/INT pin to go active. This register is reset by a read operation, provided that any out-oflimit event has been corrected.
PAGE 29
ADT7316/ADT7317/ADT7318 External Temperature Value Register MSBs (Read-Only) [Address 0x08] This 8-bit, read-only register stores the external temperature value from the external temperature sensor in twos complement format. The 8 MSBs of the 10-bit value are stored in this register. Table 26. DAC B (ADT7317) LSBs Table 21. External Temperature Value MSBs DAC B Register MSBs (Read/Write) [Address 0x13] This 8-bit read/write register contains the 8 MSBs of the DAC B word.
PAGE 30
ADT7316/ADT7317/ADT7318 DAC D Register LSBs (Read/Write) [Address 0x16] This 8-bit read/write register contains the 4/2 LSBs of the ADT7316/ADT7317 DAC D word, respectively. The value in this register is combined with the value in the DAC D register MSBs and converted to an analog voltage on the VOUT-D pin. On power-up, the voltage output on the VOUT-D pin is 0 V. Table 35. Control Configuration 1 Bit Descriptions Bit C0 Table 31.
PAGE 31
ADT7316/ADT7317/ADT7318 Control Configuration 3 Register (Read/Write) [Address 0x1A] This configuration register is an 8-bit read/write register that is used to set up some of the operating modes of the ADT7316/ ADT7317/ADT7318. Table 41. DAC Configuration Bit D0 D1 Table 38. Control Configuration 3 D7 C7 01 1 D6 C6 01 D5 C5 01 D4 C4 01 D3 C3 01 D2 C2 01 D1 C1 01 D0 C0 01 D2 D3 Default settings at power-up. Table 39.
PAGE 32
ADT7316/ADT7317/ADT7318 Interrupt Mask 1 Register (Read/Write) [Address 0x1D] This mask register is an 8-bit, read/write register that can be used to mask out any interrupts that can cause the INT/INT pin to go active. Table 48. Internal Temperature Offset D7 D7 01 1 Table 44. Interrupt Mask 1 D7 D7 01 1 D6 D6 01 D5 D5 01 D4 D4 01 D3 D3 01 D2 D2 01 D1 D1 01 D0 D0 01 Default settings at power-up. Table 45.
PAGE 33
ADT7316/ADT7317/ADT7318 External Analog Temperature Offset Register (Read/Write) [Address 0x22] This register contains the offset value for the external thermal voltage output. A twos complement number can be written to this register which is then added to the measured result before it is converted by DAC B. Varying the value in this register has the affect of varying the temperature span. For example, the output voltage can represent a temperature span of −128°C to +127°C or even 0°C to 127°C.
PAGE 34
ADT7316/ADT7317/ADT7318 Manufacturer’s ID Register (Read-Only) [Address 0x4E] This register contains the manufacturers identification number. Analog Devices, Inc.’s ID is 0x41. External TLOW Limit Register (Read/Write) [Address 0x28] This limit register is an 8-bit, read/write register that stores the twos complement of the external temperature lower limit that causes an interrupt and activates the INT/INT output (if enabled).
PAGE 35
ADT7316/ADT7317/ADT7318 A CS (START HIGH) C B SPI LOCKED ON THIRD RISING EDGE A SPI FRAMING EDGE C B SPI LOCKED ON THIRD RISING EDGE 02661-048 CS (START LOW) SPI FRAMING EDGE Figure 50. Serial Interface—Selecting and Locking SPI Protocol 1 9 1 9 SCL 1 0 0 1 A2 A1 START BY MASTER A0 R/W P7 P6 ACKNOWLEDGE BY ADT7316/ADT7317/ADT7318 FRAME 1 SERIAL BUS ADDRESS BYTE P5 P4 P3 P2 P1 P0 ACKNOWLEDGE BY ADT7316/ADT7317/ADT7318 FRAME 2 ADDRESS POINTER REGISTER BYTE Figure 51.
PAGE 36
ADT7316/ADT7317/ADT7318 SERIAL INTERFACE There are two serial interfaces that can be used on this part, the I2C and the SPI interface. The device powers up with the serial interface in I2C mode, but it is not locked into this mode. To stay in I2C mode, it is recommended that the user ties the CS line to either VCC or GND. It is not possible to lock the I2C mode, but it is possible to select and lock the SPI mode. calculated using CRC-8.
PAGE 37
ADT7316/ADT7317/ADT7318 Writing to the ADT7316/ADT7317/ADT7318 SPI SERIAL INTERFACE Depending on the register being written to, there are two different writes for the ADT7316/ADT7317/ADT7318. It is not possible to do a block write to this part, that is, no I2C auto-increment. The SPI serial interface of the ADT7316/ADT7317/ADT7318 consists of four wires, CS, SCLK, DIN, and DOUT. The CS is used to select the device when more than one device is connected to the serial clock and data lines.
PAGE 38
ADT7316/ADT7317/ADT7318 Write Operation time. In Figure 54, the register address section provides the first register address that is written to. Subsequent data bytes are written into sequential writable registers. Therefore, after each data byte has been written into a register, the address pointer register auto-increments its value to the next available register.
PAGE 39
ADT7316/ADT7317/ADT7318 CS 1 8 8 1 SCLK DIN D7 D6 D5 D4 D3 D2 D1 D0 X X X X X X X X DOUT X X X X X X X X D7 D6 D5 D4 D3 D2 D1 D0 STOP READ COMMAND 02661-056 START DATA BYTE 1 Figure 56.
PAGE 40
ADT7316/ADT7317/ADT7318 The ADT7316/ADT7317/ADT7318 INT/INT output is an interrupt line that signals an over-limit/under-limit event on any of the measurement channels if the interrupt on that event has not been disabled. The ADT7316/ADT7317/ADT7318 are slave-only devices and use the SMBus/SPI INT/INT as their only means to signal other devices that an event has occurred.
PAGE 41
ADT7316/ADT7317/ADT7318 LAYOUT CONSIDERATIONS Digital boards can be electrically noisy environments, and care must be taken to protect the analog inputs from noise, particularly when measuring the very small voltages from a remote diode sensor. Take the following precautions: • • Place the ADT7316/ADT7317/ADT7318 as close as possible to the remote sensing diode.
PAGE 42
ADT7316/ADT7317/ADT7318 OUTLINE DIMENSIONS 0.197 0.193 0.189 9 16 0.158 0.154 0.150 1 0.244 0.236 0.228 8 PIN 1 0.069 0.053 0.065 0.049 0.010 0.025 0.004 BSC COPLANARITY 0.004 0.012 0.008 SEATING PLANE 0.010 0.006 8° 0° 0.050 0.016 COMPLIANT TO JEDEC STANDARDS MO-137-AB Figure 62.
PAGE 43
ADT7316/ADT7317/ADT7318 NOTES Rev.