Datasheet

AD7887
Rev. D | Page 4 of 24
Parameter A Version
1
B Version
1
Unit Test Conditions/Comments
CONVERSION RATE
Throughput Time 16 16 SCLK cycles
Conversion time plus acquisition time is 125 kSPS,
with 2 MHz Clock
Track/Hold Acquisition Time
2
1.5 1.5 SCLK cycles
Conversion Time 14.5 14.5 SCLK cycles 7.25 μs (2 MHz Clock)
POWER REQUIREMENTS
V
DD
+2.7/+5.25 +2.7/+5.25 V min/max
I
DD
Normal Mode
5
(Mode 2)
Static 700 700 μA max
Operational (f
SAMPLE
= 125 kSPS) 850 850 μA typ Internal reference enabled
700 700 μA typ Internal reference disabled
Using Standby Mode (Mode 4) 450 450 μA typ f
SAMPLE
= 50 kSPS
Using Shutdown Mode (Modes 1, 3) 120 120 μA typ f
SAMPLE
= 10 kSPS
12 12 μA typ f
SAMPLE
= 1 kSPS
Standby Mode
6
210 210 μA max V
DD
= 2.7 V to 5.25 V
Shutdown Mode
6
1 1 μA max V
DD
= 2.7 V to 3.6 V
2 2 μA max V
DD
= 4.75 V to 5.25 V
Normal Mode Power Dissipation 3.5 3.5 mW max V
DD
= 5 V
2.1 2.1 mW max V
DD
= 3 V
Shutdown Power Dissipation 5 5 μW max V
DD
= 5 V
3 3 μW max V
DD
= 3 V
Standby Power Dissipation 1.05 1.05 mW max V
DD
= 5 V
630 630 μW max V
DD
= 3 V
1
Temperature range for A and B versions is −40°C to +125°C.
2
See the Terminology section.
3
SNR calculation includes distortion and noise components.
4
Sample tested at +25°C to ensure compliance.
5
All digital inputs at GND except
CS
at V
DD
. No load on the digital outputs. Analog inputs at GND.
6
SCLK at GND when SCLK off. All digital inputs at GND except for
CS
at V
DD
. No load on the digital outputs. Analog inputs at GND.