B Version applies to AD7417 only with temperature range of –40°C to +85°C. A Version temperature range is –40°C to +125°C. For V
DD
= 2.7 V, T
A
= 85°C max
and temperature sensor measurement error =
±
3°C.
2
See Terminology.
3
Refers to the input current when the part is not converting. Primarily due to reverse leakage current in the ESD protection diodes.
4
Sample tested during initial release and after any redesign or process change that may affect this parameter.
5
On-chip reference shuts down when external reference is applied.
6
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.
AD7416–SPECIFICATIONS
Parameter
(V
DD
= 2.7 V to 5.5 V, GND = 0 V, REF
IN
= 2.5 V, unless otherwise noted.)
Min
Typ
Max
±
2.0
±
3.0
Unit
°C
°C
Bits
µs
µs
ms
mA
µA
µA
°C
°C
V
V
µA
µA
pF
V
µA
ns
V
µs
ns
ns
ns
ns
ns
Test Conditions/Comments
T
A
= –25°C to +100°C
(V
DD
= 3 V min)
1
T
A
= –40°C to +125°C
(V
DD
= 3 V min)
1
TEMPERATURE SENSOR AND ADC
Accuracy
Resolution
Temperature Conversion Time
Update Rate, t
R
OTI Delay
Supply Current
10
40
400
1
×
t
R
350
0.2
80
75
V
DD
×
0.7
–0.3
+0.005
–0.005
20
6
×
t
R
1.0
600
1.5
Depends on Fault Queue Setting
I
2
C Active
I
2
C Inactive
Shutdown Mode
T
OTI
Default Temperature
T
HYST
Default Temperature
DIGITAL INPUTS
Input High Voltage, V
IH
Input Low Voltage, V
IL
Input High Current, I
IH
Input Low Current, I
IL
Input Capacitance, C
IN
DIGITAL OUTPUTS
Output Low Voltage, V
OL
Output High Current
Output Fall Time, t
f
OS Output Low Voltage, V
OL
AC ELECTRICAL CHARACTERISTICS
2
Serial Clock Period, t
1
Data In Setup Time to SCL High, t
2
Data Out Stable after SCL Low, t
3
SDA Low Setup Time to SCL Low
(Start Condition), t
4
SDA High Hold Time after SCL High
(Stop Condition), t
5
SDA and SCL Fall Time, t
6
2.5
50
0
50
50
V
DD
+ 0.5
V
DD
×
0.3
+1.0
–1.0
V
IN
= 5 V
V
IN
= 0 V
All Digital Inputs
I
OL
= 3 mA
V
OH
= 5 V
C
L
= 400 pF, I
O
= 3 mA
I
OUT
= 4 mA
AD7416/AD7417/AD7418
See Figure 1
See Figure 1
See Figure 1
See Figure 1
See Figure 1
See Figure 1
0.4
1
250
0.8
300
NOTES
1
For V
DD
= 2.7 V to 3 V, T
A
max = 85°C and accuracy =
±
3°C.
2
Sample tested during initial release and after any redesign or process change that may affect this parameter.
Specifications subject to change without notice.
t
1
SCL
t
4
SDA
DATA IN
t
2
t
5
t
3
SDA
DATA OUT
t
6
Figure 1. Diagram for Serial Bus Timing
REV. G
–3–
AD7416/AD7417/AD7418
AD7417 PIN FUNCTION DESCRIPTION
Pin No.
1, 16
2
3
4
Mnemonic
NC
SDA
SCL
OTI
Description
No Connection. Do not connect anything to this pin.
Digital I/O. Serial bus bidirectional data. Push-pull output.
Digital Input. Serial bus clock.
This is a logic output. The overtemperature indicator (OTI) is set if the result of a conversion on
Channel 0 (temperature sensor) is greater than an 8-bit word in the overtemperature register (OTR).
The signal is reset at the end of a serial read operation. Open-drain output.
Reference Input. An external 2.5 V reference can be connected to the AD7417 at this pin. To enable the
on-chip reference, the REFIN pin should be tied to GND. If an external reference is connected to the
AD7417, the internal reference will shut down.
Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry.
Analog Input Channels. The AD7417 has four analog input channels. The input channels are single-ended
with respect to GND. The input channels can convert voltage signals in the range 0 V to V
REF
. A chan-
nel is selected by writing to the configuration register of the AD7417. (See Control Byte section.)
Digital Input. The highest programmable bit of the serial bus address.
Digital Input. The middle programmable bit of the serial bus address.
Digital Input. The lowest programmable bit of the serial bus address.
Positive Supply Voltage, 2.7 V to 5.5 V.
Logic Input Signal. Convert start signal. The rising edge of this signal fully powers up the part. The
power-up time for the part is 4
µs.
If the
CONVST
pulse is greater than 4
µs,
the falling edge of
CONVST
places the track-and-hold mode into hold mode and initiates a conversion. If the pulse is less than 4
µs,
an internal timer ensures that the track-and-hold does not go into hold and conversion is not initiated
until the power-up time has elapsed. The track-and-hold goes into track mode again at the end of con-
version. (See Operating Mode section.)
5
REF
IN
6
7–10
GND
A
IN1
to A
IN4
11
12
13
14
15
A2
A1
A0
V
DD
CONVST
AD7417 PIN CONFIGURATION
SOIC/TSSOP
NC
1
SDA
2
SCL
3
OTI
4
16
NC
15
CONVST
14
V
DD
AD7417
13
A0
TOP VIEW
REF
IN 5
(Not to Scale)
12
A1
GND
6
A
IN1 7
A
IN2 8
11
A2
10
A
IN4
9
A
IN3
NC = NO CONNECT
–4–
REV. G
AD7416/AD7417/AD7418
AD7416 PIN FUNCTION DESCRIPTION
Pin No.
1
2
3
Mnemonic
SDA
SCL
OTI
Description
Digital I/O. Serial bus bidirectional data. Push-pull output.
Digital Input. Serial bus clock.
This is a logic output. The OTI is set if the result of a conversion on Channel 0 (temperature sensor) is
greater that an 8-bit word in the OTR. The signal is reset at the end of a serial read operation. Open-
drain output.
Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry.
Digital Input. The highest programmable bit of the serial bus address.
Digital Input. The middle programmable bit of the serial bus address.
Digital Input. The lowest programmable bit of the serial bus address.
Positive Supply Voltage, 2.7 V to 5.5 V.
AD7418 PIN FUNCTION DESCRIPTION
4
5
6
7
8
GND
A2
A1
A0
V
DD
Pin No.
1
2
3
Mnemonic
SDA
SCL
OTI
Description
Digital I/O. Serial bus bidirectional data. Push-pull output.
Digital Input. Serial bus clock.
This is a logic output. The OTI is set if the result of a conversion on Channel 0 (temperature sensor) is
greater that an 8-bit word in the OTR. The signal is reset at the end of a serial read operation. Open-
drain output.
Ground reference for track-and-hold, comparator and capacitor DAC, and digital circuitry.
Analog Input Channel. The input channel is single-ended with respect to GND. The input channel can
convert voltage signals in the range 0 V to V
REF
. The analog input channel is selected by writing to the
configuration register of the AD7418 and choosing Channel 4. (See Control Byte section.)
Reference Input. An external 2.5 V reference can be connected to the AD7418 at this pin. To enable the
on-chip reference, the REF
IN
pin should be tied to GND. If an external reference is connected to the
AD7418, the internal reference will shut down.
Positive Supply Voltage, 2.7 V to 5.5 V.
Logic Input Signal. Convert start signal. The rising edge of this signal fully powers up the part. The
power-up time for the part is 4
µs.
If the
CONVST
pulse is greater than 4
µs,
the falling edge of
CONVST
places the track-and-hold mode into hold mode and initiates a conversion. If the pulse is less
than 4
µs,
an internal timer ensures that the track-and-hold does not go into hold and conversion is not
initiated until the power-up time has elapsed. The track-and-hold goes into track mode again at the end
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