LSB means least significant bit. With the 5 V input range, one LSB is 305.2 µV.
See Terminology section. These specifications do include full temperature range variation but do not include the error contribution from the external reference.
3
All specifications in dB are referred to a full-scale input FS. Tested with an input signal at 0.5 dB below full-scale, unless otherwise specified.
4
f
IN1
= 21.4 kHz, f
IN2
= 18.9 kHz, each tone at −7 dB below full-scale.
Rev Pr B | Page 3 of 28
AD7942
Table 3.
Parameter
REFERENCE
Voltage Range
Load Current
SAMPLING DYNAMICS
−3 dB Input Bandwidth
Aperture Delay
DIGITAL INPUTS
Logic Levels
V
IL
V
IH
I
IL
I
IH
DIGITAL OUTPUTS
Data Format
Pipeline Delay
V
OL
V
OH
POWER SUPPLIES
VDD
VIO
VIO Range
Standby Current
1, 2
Power Dissipation
Conditions
Min
0.5
250 kSPS, REF = 5 V
Preliminary Technical Data
VDD = 2.3 V to 5.5 V, VIO = 2.3 V to VDD, V
REF
= VDD, T
A
= –40°C to +85°C, unless otherwise noted.
Typ
Max
VDD + 0.3
TBD
2
2.5
Unit
V
µA
MHz
ns
VDD = 5 V
–0.3
0.7 × VIO
−1
−1
0.3 × VIO
VIO + 0.3
+1
+1
V
V
µA
µA
I
SINK
= +500 µA
I
SOURCE
= −500 µA
Specified Performance
Specified Performance
VDD and VIO = 5 V, 25°C
VDD = 2.5 V, 100 SPS Throughput
VDD = 2.5 V, 100 kSPS Throughput
VDD = 2.5 V, 200 kSPS Throughput
VDD = 5 V, 100 kSPS Throughput
VDD = 5 V, 250 kSPS Throughput
T
MIN
to T
MAX
Serial 14 Bits Straight Binary
Conversion Results Available Immediately
after Completed Conversion
0.4
VIO − 0.3
2.3
2.3
1.8
1
1.15
1.15
2.25
3.3
5.5
VDD + 0.3
VDD + 0.3
50
2
4
5
12.5
+85
V
V
V
V
V
nA
µW
mW
mW
mW
mW
°C
TEMPERATURE RANGE
3
Specified Performance
−40
1
2
With all digital inputs forced to VIO or GND as required.
During acquisition phase.
3
Contact Analog Devices for extended temperature range.
Rev Pr B | Page 4 of 28
Preliminary Technical Data
TIMING SPECIFICATIONS
−40°C to +85°C, VIO = 2.3 V to 5.5 V or VDD + 0.3 V, whichever is the lowest, unless otherwise stated.
Table 4. VDD = 4.5 V to 5.5 V
1
Conversion Time: CNV Rising Edge to Data Available
Acquisition Time
Time between Conversions
CNV Pulse Width ( CS Mode )
SCK Period ( CS Mode )
SCK Period ( Chain Mode )
VIO above 4.5 V
VIO above 3 V
VIO above 2.7 V
VIO above 2.3 V
SCK Low Time
SCK High Time
SCK Falling Edge to Data Remains Valid
SCK Falling Edge to Data Valid Delay
VIO above 4.5 V
VIO above 3 V
VIO above 2.7 V
VIO above 2.3 V
CNV or SDI Low to SDO D15 MSB Valid (CS Mode)
VIO above 4.5 V
VIO above 2.7 V
VIO above 2.3 V
CNV or SDI High or Last SCK Falling Edge to SDO High Impedance (CS Mode)
SDI Valid Setup Time from CNV Rising Edge (CS Mode)
SDI Valid Hold Time from CNV Rising Edge (CS Mode)
SCK Valid Setup Time from CNV Rising Edge (Chain Mode)
SCK Valid Hold Time from CNV Rising Edge (Chain Mode)
SDI Valid Setup Time from SCK Falling Edge (Chain Mode)
SDI Valid Hold Time from SCK Falling Edge (Chain Mode)
SDI High to SDO High (Chain Mode with BUSY indicator)
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