Datasheet

REV. D
–2–
AD7871/AD7872–SPECIFICATIONS
(V
DD
= +5 V 6 5%, V
SS
= –5 V 6 5%, AGND = DGND =
O V, f
CLK
= 2 MHz external, f
SAMPLE
= 83 kHz unless otherwise
noted.) All Specifications T
MIN
to T
MAX
unless otherwise noted.
J, A K T, B
Parameter Versions
1
Version
1
Versions
1
Units Test Conditions/Comments
DYNAMIC PERFORMANCE
2
Signal-to-Noise Ratio
3
(SNR) @ +25°C 80 80 79 dB min V
IN
= 10 kHz Sine Wave
T
MIN
to T
MAX
80 80 79 dB min SNR is Typically 82 dB for <V
IN
<41.5 kHz;
Total Harmonic Distortion (THD) –86 –88 dB max V
IN
= 10 kHz Sine Wave
–85 dB typ
Peak Harmonic or Spurious Noise –86 –88 dB max V
IN
= 10 kHz.
–85 dB typ
Intermodulation Distortion (IMD)
Second Order Terms –86 –88 dB max fa = 9 kHz, fb = 9.5 kHz, f
SAMPLE
= 50 kHz
–85 dB typ
Third Order Terms –86 –88 dB max fa = 9 kHz, fb = 9.5 kHz, f
SAMPLE
= 50 kHz
–85 dB typ
Track/Hold Acquisition Time 2 2 2 µs max
DC ACCURACY
Resolution 14 14 14 Bits
Minimum Resolution for Which
No Missing Codes Are Guaranteed 14 14 14 Bits
Integral Nonlinearity @ +25°C ±1/2 ±1/2 LSB typ
Integral Nonlinearity ±1 ±1 LSB max
Bipolar Zero Error ±12 ±12 ±12 LSB max
Positive Gain Error
4
±12 ±12 ±12 LSB max
Negative Gain Error
4
±12 ±12 ±12 LSB max
ANALOG INPUT
Input Voltage Range ±3 ±3 ±3 Volts
Input Current ±500 ±500 ±500 µA max
REFERENCE OUTPUT
REF OUT @ +25°C 2.99/3.01 2.99/3.01 2.99/3.01 V min/V max
T
MIN
to T
MAX
2.98/3.02 2.98/3.02 2.98/3.02 V min/V max
REF OUT Tempco ±40 ±40 ppm/°C max Typically 35 ppm
Reference Load Sensitivity
(∆REF OUT/∆I) ±1.2 ±1.2 ±1.2 mV max Reference Load Current Change (0 µA–300 µA);
Reference Load Should Not Be Changed During
Conversion
LOGIC INPUTS
Input High Voltage, V
INH
2.4 2.4 2.4 V min V
DD
= 5 V ± 5%
Input Low Voltage, V
INL
0.8 0.8 0.8 V max V
DD
= 5 V ± 5%
Input Current, I
IN
±10 ±10 ±10 µA max V
IN
= 0 V to V
DD
Input Current (14/8/CLK Input Only) ±10 ±10 ±10 µA max V
IN
= V
SS
to V
DD
Input Capacitance, C
IN
5
10 10 10 pF max
LOGIC OUTPUTS
Output High Voltage, V
OH
4.0 4.0 4.0 V min I
SOURCE
= 40 µA
Output Low Voltage, V
OL
0.4 0.4 0.4 V max I
SINK
= 1.6 mA
DB13 – DB0
Floating-State Leakage Current 10 10 10 µA max
Floating-State Output Capacitance
5
15 15 15 pF max
CONVERSION TIME
External Clock 10 10 10 µs max
Internal Clock 10.5 10.5 11 µs max The Internal Clock Has a Nominal Value of 2 MHz
POWER REQUIREMENTS
V
DD
+5 +5 +5 V nom ±5% for Specified Performance
V
SS
–5 –5 –5 V nom ±5% for Specified Performance
I
DD
13 13 13 mA max Typically 6 mA
I
SS
6 6 6 mA max Typically 4 mA
Power Dissipation 95 95 95 mW max Typically 50 mW
NOTES
1
Temperature ranges are as follows: J, K versions, 0°C to +70°C; A, B versions, –40°C to +85°C; T version; –55°C to +125°C.
2
V
IN
= ±3 V.
3
SNR calculation includes distortion and noise components.
4
Measured with respect to internal reference.
5
Sample tested @ +25°C to ensure compliance.
Specifications subject to change without notice.