Datasheet

AD7938-6 Data Sheet
Rev. C | Page 4 of 32
Parameter Value
1
Unit Test Conditions/Comments
DC Leakage Current
4
±1 μA max
Input Capacitance 45 pF typ When in track
10 pF typ When in hold
REFERENCE INPUT/OUTPUT
V
REF
Input Voltage
5
2.5 V ±1% for specified performance
DC Leakage Current ±1 μA max
V
REFOUT
Output Voltage 2.5 V ±0.2% max @ 25°C
V
REFOUT
Temperature Coefficient 25 ppm/°C max
5 ppm/°C typ
V
REF
Noise 10 μV typ 0.1 Hz to 10 Hz bandwidth
130 μV typ 0.1 Hz to 1 MHz bandwidth
V
REF
Output Impedance 10 Ω typ
V
REF
Input Capacitance 15 pF typ When in track
25 pF typ When in hold
LOGIC INPUTS
Input High Voltage, V
INH
2.4 V min
Input Low Voltage, V
INL
0.8 V max
Input Current, I
IN
±5 μA max Typically 10 nA, V
IN
= 0 V or V
DRIVE
Input Capacitance, C
IN
4
10 pF max
LOGIC OUTPUTS
Output High Voltage, V
OH
2.4 V min I
SOURCE
= 200 μA
Output Low Voltage, V
OL
0.4 V max I
SINK
= 200 μA
Floating-State Leakage Current ±3 μA max
Floating-State Output Capacitance
4
10 pF max
Output Coding Straight (Natural) Binary CODING bit = 0
Twos Complement CODING bit = 1
CONVERSION RATE
Conversion Time t
2
+ 13 t
CLKIN
ns
Track-and-Hold Acquisition Time 125 ns max Full-scale step input
80 ns typ Sine wave input
Throughput Rate 625 kSPS max
POWER REQUIREMENTS
V
DD
2.7/5.25 V min/max
V
DRIVE
2.7/5.25 V min/max
I
DD
6
Digital inputs = 0 V or V
DRIVE
Normal Mode (Static) 0.8 mA typ V
DD
= 2.7 V to 5.25 V, SCLK on or off
Normal Mode (Operational) 1.5 mA max V
DD
= 4.75 V to 5.25 V
1.2 mA max V
DD
= 2.7 V to 3.6 V
Autostandby Mode 0.3 mA typ f
SAMPLE
= 100 kSPS, V
DD
= 5 V
160 μA typ Static
Full/Autoshutdown Mode (Static) 2 μA max SCLK on or off
Power Dissipation
Normal Mode (Operational) 7.5 mW max V
DD
= 5 V
3.6 mW max V
DD
= 3 V
Autostandby Mode (Static) 800 μW typ V
DD
= 5 V
480 μW typ V
DD
= 3 V
Full/Autoshutdown Mode (Static) 10 μW max V
DD
= 5 V
6 μW max V
DD
= 3 V
1
Temperature range is −40°C to +85°C.
2
See the Terminology section.
3
For full common-mode range, see Figure 25 and Figure 26.
4
Sample tested during initial release to ensure compliance.
5
This device is operational with an external reference in the range of 0.1 V to V
DD
. See the Reference section for more information.
6
Measured with a midscale dc analog input.