Datasheet

REV. C–2–
AD7816/AD7817/AD7818
Parameter A Version *B Version *S Version Unit Test Conditions/Comments
DYNAMIC PERFORMANCE Sample Rate = 100 kSPS, Any
Channel, f
IN
= 20 kHz
Signal to (Noise + Distortion) Ratio
2
58 58 58 dB min
Total Harmonic Distortion
2
–65 –65 –65 dB max –75 dB typ
Peak Harmonic or Spurious Noise
2
–65 –65 –65 dB max –75 dB typ
Intermodulation Distortion
2
fa =19.9 kHz, fb = 20.1 kHz
Second Order Terms –67 –67 –67 dB typ
Third Order Terms –67 –67 –67 dB typ
Channel-to-Channel Isolation
2
–80 –80 –80 dB typ f
IN
= 20 kHz
DC ACCURACY Any Channel
Resolution 10 10 10 Bits
Minimum Resolution for Which
No Missing Codes are Guaranteed 10 10 10 Bits
Relative Accuracy
2
⫾1 ⫾1 ⫾1LSB max
Differential Nonlinearity
2
⫾1 ⫾1 ⫾1LSB max
Gain Error
2
⫾2 ⫾2 ⫾2LSB max External Reference
⫾10 ⫾10 +20/–10 LSB max Internal Reference
Gain Error Match
2
⫾1/2 ⫾1/2 ⫾1/2 LSB max
Offset Error
2
⫾2 ⫾2 ⫾2LSB max
Offset Error Match ⫾1/2 ⫾1/2 ⫾1/2 LSB max
TEMPERATURE SENSOR
1
Measurement Error External Reference V
REF
= 2.5 V
Ambient Temperature 25°C ⫾2 ⫾1 ⫾2 °C max
T
MIN
to T
MAX
⫾3 ⫾2 ⫾3 °C max
Measurement Error On-Chip Reference
Ambient Temperature 25°C ⫾2.25 ⫾2.25 ⫾2.25 °C max
T
MIN
to T
MAX
⫾3 ⫾3 ⫾6 °C max
Temperature Resolution 1/4 1/4 1/4 °C/LSB
REFERENCE INPUT
3, 4
REF
IN
Input Voltage Range
3
2.625 2.625 2.625 V max 2.5 V + 5%
2.375 2.375 2.375 V min 2.5 V – 5%
Input Impedance 40 40 40 kΩ min
Input Capacitance 10 10 10 pF max
ON-CHIP REFERENCE
5
Nominal 2.5 V
Temperature Coefficient
3
80 80 150 ppm/°C typ
CONVERSION RATE
Track/Hold Acquisition Time
4
400 400 400 ns max Source Impedance < 10 Ω
Conversion Time
Temperature Sensor 27 27 27 µs max
Channels 1 to 4 9 9 9 µs max
POWER REQUIREMENTS
V
DD
5.5 5.5 5.5 V max For Specified Performance
2.7 2.7 2.7 V min
I
DD
Logic Inputs = 0 V or V
DD
Normal Operation 2 2 2 mA max 1.6 mA typ
Using External Reference 1.75 1.75 1.75 mA max 2.5 V External Reference Connected
Power-Down (V
DD
= 5 V) 10 10 12.5 µA max 5.5 µA typ
Power-Down (V
DD
= 3 V) 4 4 4.5 µA max 2 µA typ
Auto Power-Down Mode V
DD
= 3 V
10 SPS Throughput Rate 6.4 6.4 6.4 µW typ See Power vs. Throughput Section for
1 kSPS Throughput Rate 48.8 48.8 48.8 µW typ Description of Power Dissipation in
10 kSPS Throughput Rate 434 434 434 µW typ Auto Power-Down Mode
Power-Down 12 12 13.5 µW max Typically 6 µW
AD7817–SPECIFICATIONS
1
(V
DD
= 2.7 V to 5.5 V, GND = 0 V, REF
IN
= 2.5 V unless otherwise noted)