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AD7878 Datasheet(PDF) 2 Page - Analog Devices

Part No. AD7878
Description  LC2MOS Complete 12-Bit 100 kHz Sampling ADC with DSP Interface
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7878 Datasheet(HTML) 2 Page - Analog Devices

 
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AD7878–SPECIFICATIONS
–2–
REV. A
(VDD = +5 V
5%, VCC = +5 V
5%, VSS = –5 V
5%, AGND = DGND =
0 V, fCLK = 8 MHz. All Specifications TMIN to TMAX, unless otherwise noted.)
J, A
K, L, B
S
Parameter
Versions
1
Versions Version
Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
2
Signal-to-Noise Ratio (SNR)
3 @ 25
°C
70
72
70
dB min
VIN = 10 kHz Sine Wave, fSAMPLE = 100 kHz
TMIN to TMAX
70
71
70
dB min
Typically 71.5 dB for 0 < VIN < 50 kHz
Total Harmonic Distortion (THD)
–80
–80
–78
dB max
VIN = 10 kHz Sine Wave, fSAMPLE = 100 kHz
Typically –86 dB for 0 < VIN < 50 kHz
Peak Harmonic or Spurious Noise
–80
–80
–78
dB max
VIN = 10 kHz, fSAMPLE = 100 kHz
Typically –86 dB for 0 < VIN < 50 kHz
Intermodulation Distortion (IMD)
Second Order Terms
–80
–80
–78
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
See Throughput Rate Section
DC ACCURACY
Resolution
12
12
12
Bits
Minimum Resolution for Which
No Missing Codes are Guaranteed
12
12
12
Bits
Relative Accuracy
±1/2
±1/4
±1/2
LSB typ
Differential Nonlinearity
±1/2
±1/2
±1/2
LSB typ
Bipolar Zero Error
±6
±6
±6
LSB max
Positive Full-Scale Error
4
±6
±6
±6
LSB max
Negative Full-Scale Error
4
±6
±6
±6
LSB max
ANALOG INPUT
Input Voltage Range
±3
±3
±3
Volts
Input Current
±550
±550
±550
µA max
REFERENCE OUTPUT
5
REF OUT
3
3
3
V nom
REF OUT Error @ 25
°C
±10
±10
±10
mV max
TMIN to TMAX
±15
±15
±15
mV max
Reference Load Sensitivity
(
∆REF OUT/∆I)
±1
±1
±1
mV max
Reference Load Current Change (0
µA–500 µA).
Reference Load Should Not Be Changed
During Conversion
LOGIC INPUTS
Input High Voltage, VINH
+2.4
+2.4
+2.4
V min
VCC = +5 V ± 5%
Input Low Voltage, VINL
+0.8
+0.8
+0.8
V max
VCC = +5 V ± 5%
Input Current, IIN
±10
±10
±10
µA max
VIN = 0 to VCC
Input Capacitance, CIN
6
10
10
10
pF max
LOGIC OUTPUTS
Output High Voltage, VOH
+2.7
+2.7
+2.7
V min
ISOURCE 40 µA
Output Low Voltage, VOL
+0.4
+0.4
+0.4
V max
ISINK = 1.6 mA
DB11–DB0
Floating State Leakage Current
±10
±10
±10
±10
µA max
Floating State Output Capacitance
6
15
15
15
15
pF max
CONVERSION TIME
7/7.125
7/7.125
7/7.125
µs min/µs max
Assuming No External Read/Write Operations
7/9.250
7/9.250
7/9.250
µs min/µs max
Assuming 17 External Read/Write Operations
See Internal Comparator Timing Section
POWER REQUIREMENTS
VDD
+5
+5
+5
V nom
±5% for Specified Performance
VCC
+5
+5
+5
V nom
±5% for Specified Performance
VSS
–5
–5
–5
V nom
±5% for Specified Performance
IDD
13
13
13
mA max
CS = DMWR = DMRD = 5 V
ICC
100
100
100
µA max
CS = DMWR = DMRD = 5 V
ISS
6
6
6
mA max
CS = DMWR = DMRD = 5 V
Power Dissipation
95.5
95.5
95.5
mW max
Typically 60 mW
NOTES
1Temperature range as follows: J, K, L versions: 0
°C to +70°C; A, B versions: –25°C to +85°C; S version: –55°C to +125°C.
2V
IN = ± 3 V. See Dynamic Specifications section.
3SNR calculation includes distortion and noise components.
4Measured with respect to the Internal Reference.
5For capacitive loads greater than 50 pF a series resistor is required (see Internal Reference section).
6Sample tested @ +25
°C to ensure compliance.
Specifications subject to change without notice.


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