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AD7868AN Arkusz danych(PDF) 2 Page - Analog Devices

Numer części AD7868AN
Szczegółowy opis  LC2MOS Complete, 12-Bit Analog I/O System
Download  16 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD7868AN Arkusz danych(HTML) 2 Page - Analog Devices

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ABT
Parameter
Version
1
Version
1
Version
1
Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
2
Signal-to-Noise Ratio
3, 4 (SNR) @ +25
°C
70
72
70
dB min
VIN = 10 kHz Sine Wave, fSAMPLE = 83 kHz
TMIN to TMAX
70
71
70
dB min
Typically 71.5 dB for 0 < VIN < 41.5 kHz
Total Harmonic Distortion (THD)
–78
–78
–76
dB max
VIN = 10 kHz Sine Wave, fSAMPLE = 83 kHz
Typically 71.5 dB for 0 < VIN < 41.5 kHz
Peak Harmonic or Spurious Noise
–78
–78
–76
dB max
VIN = 10 kHz Sine Wave, fSAMPLE = 83 kHz
Typically 71.5 dB for 0 < VIN < 41.5 kHz
Intermodulation Distortion (IMD)
Second Order Terms
–78
–78
–76
dB max
fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 50 kHz
Third Order Terms
–80
–80
–78
dB max
fa = 9 kHz, fb = 9.5 kHz, fSAMPLE = 50 kHz
Track/Hold Acquisition Time
2
2
2
µs max
DC ACCURACY
Resolution
12
12
12
Bits
Minimum Resolution
12
12
12
Bits
No Missing Codes Are Guaranteed
Integral Nonlinearity
±12
±12
±12
LSB typ
Integral Nonlinearity
±1
±1
LSB max
Differential Nonlinearity
±0.9
±0.9
±0.9
LSB max
Bipolar Zero Error
±5
±5
±5
LSB max
Positive Gain Error5
±5
±5
±5
LSB max
Negative Gain Error5
±5
±5
±5
LSB max
ANALOG INPUT
Input Voltage Range
±3
±3
±3
Volts
Input Current
±1
±1
±1
mA max
REFERENCE OUTPUT
6
RO ADC @ +25
°C
2.99/3.01
2.99/3.01
2.99/3.01
V min/V max
RO ADC TC
±25
±25
±25
ppm/
°C typ
RO ADC TC
±40
±50
ppm/
°C max
Reference Load Sensitivity (
∆RO ADC vs. ∆I)
–1.5
–1.5
–1.5
mV max
Reference Load Current Change (0
µA–500 µA),
Reference Load Should Not Be Changed
During Conversion
LOGIC INPUTS (CONVST, CLK, CONTROL)
Input High Voltage, VINH
2.4
2.4
2.4
V min
VDD = 5 V ± 5%
Input Low Voltage, VINL
0.8
0.8
0.8
V max
VDD = 5 V ± 5%
Input Current, IIN
±10
±10
±10
µA max
VIN = 0 V to VDD
Input Current
7 (CONTROL Input Only)
±10
±10
±10
µA max
VIN = VSS to DGND
Input Capacitance, CIN
8
10
10
10
pF max
LOGIC OUTPUTS
DR, RFS Outputs
Output Low Voltage, VOL
0.4
0.4
0.4
V max
ISINK = 1.6 mA, Pull-Up Resistor = 4.7 kΩ
RCLK Output
Output Low Voltage, VOL
0.4
0.4
0.4
V max
ISINK = 2.6 mA, Pull-Up Resistor = 2 kΩ
DR, RFS, RCLK Outputs
Floating-State Leakage Current
±10
±10
±10
µA max
Floating-State Output Capacitance
8
15
15
15
pF max
CONVERSION TIME
External Clock
10
10
10
µs max
Internal Clock
10
10
10
µs max
The Internal Clock Has a Nominal Value of 2.0 MHz
POWER REQUIREMENTS
For Both DAC and ADC
VDD
+5
+5
+5
V nom
±5% for Specified Performance
VSS
–5
–5
–5
V nom
±5% for Specified Performance
IDD
22
22
25
mA max
Cumulative Current from the Two VDD Pins
ISS
12
12
13
mA max
Cumulative Current from the Two VSS Pins
Total Power Dissipation
170
170
190
mW max
Typically 130 mW
NOTES
1Temperature ranges are as follows: A/B Versions, –40
°C to +85°C; T Version, –55°C to +125°C.
2V
IN =
± 3 V
3SNR calculation includes distortion and noise components.
4SNR degradation due to asynchronous DAC updating during conversion is 0.1 dB typ.
5Measured with respect to internal reference.
6For capacitive loads greater than 50 pF a series resistor is required (see INTERNAL REFERENCE section).
7Tying the CONTROL input to V
DD places the device in a factory test mode where normal operation is not exhibited.
8Sample tested @ +25
°C to ensure compliance.
Specifications subject to change without notice.
REV. B
–2–
AD7868–SPECIFICATIONS
(VDD = +5 V
5%, VSS = –5 V
5%, AGND = DGND = 0 V, fCLK = 2.0 MHz external. All specifications TMIN to TMAX-
unless otherwise noted.)
ADC SECTION


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