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AD7821 Fiches technique(PDF) 2 Page - Analog Devices

No de pièce AD7821
Description  LC2MOS High Speed, P Compatible 8-Bit ADC with Track/Hold Function
Download  16 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7821 Fiches technique(HTML) 2 Page - Analog Devices

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REV. B
AD7821–SPECIFICATIONS
VDD = +5 V
5%, GND = 0 V. Unipolar Input Range: VSS = GND, VREF(+) = 5 V,
VREF(–) = GND. Bipolar Input Range: VSS = –5 V
5%, VREF(+) = 2.5 V,
VREF(–) = –2.5 V. These test conditions apply unless otherwise stated. All specifications TMIN to TMAX unless otherwise noted. Specifications
apply for RD Mode (Pin 7 = 0 V).
Parameter
K Version
1
B, T Versions
Unit
Comments
UNIPOLAR INPUT RANGE
Resolution
2
88
Bits
Total Unadjusted Error
3
±1
±1
LSB max
Minimum Resolution for which
No Missing Codes are Guaranteed
8
8
Bits
BIPOLAR INPUT RANGE
Resolution
2
88
Bits
Zero Code Error
±1
±1
LSB max
Full Scale Error
±1
±1
LSB max
Signal-to-Noise Ratio (SNR)
3
45
45
dB min
VIN = 99.85 kHz Full-Scale Sine Wave with fSAMPLING = 500 kHz
Total Harmonic Distortion (THD)
3
–50
–50
dB max
VIN = 99.85 kHz Full-Scale Sine Wave with fSAMPLING = 500 kHz
Peak Harmonic or Spurious Noise
3
–50
–50
dB max
VIN = 99.85 kHz Full-Scale Sine Wave with fSAMPLING = 500 kHz
Intermodulation Distortion (IMD)
3
fa (84.72 kHz) and fb (94.97 kHz) Full-Scale Sine Waves
with fSAMPLING = 500 kHz
–50
–50
dB max
Second Order Terms
–50
–50
dB max
Third Order Terms
Slew Rate, Tracking
3
1.6
1.6
V/
µs max
2.36
2.36
V/
µs typ
REFERENCE INPUT
Input Resistance
1.0/4.0
1.0/4.0
k
Ω min/kΩ max
VREF(+) Input Voltage Range
VREF(–)/VDD
VREF(–)/VDD
V min/V max
VREF(–) Input Voltage Range
VSS/VREF(+)
VSS/VREF(+)
V min/V max
ANALOG INPUT
Input Voltage Range
VREF(–)/VREF(+)
VREF(–)/VREF(+)
V min/ max
Input Leakage Current
±3
±3
µA max
–5 V
≤ V
IN
≤ +5 V
Input Capacitance
55
55
pF typ
LOGIC INPUTS
CS, WR, RD
VINH
2.4
2.4
V min
VINL
0.8
0.8
V max
IINH (CS, RD)1
1
µA max
IINH (WR)3
3
µA max
IINL
–1
–1
µA max
Input Capacitance
4
88
pF max
Typically 5 pF
MODE
VINH
3.5
3.5
V min
VINL
1.5
1.5
V max
IINH
200
200
µA max
50
µA typ
IINL
–1
–1
µA max
Input Capacitance
4
88
pF max
Typically 5 pF
LOGIC OUTPUTS
DB0–DB7,
OFL, INT
VOH
4.0
4.0
V min
ISOURCE = 360
µA
VOL
0.4
0.4
V max
ISINK = 1.6 mA
IOUT (DB0–DB7)
±3
±3
µA max
Floating State Leakage
Output Capacitance
4 (DB0–DB7)
8
8
pF max
Typically 5 pF
RDY
VOL
0.4
0.4
V max
ISINK = 2.6 mA
IOUT
±3
±3
µA max
Floating State Leakage
Output Capacitance
4
88
pF max
Typically 5 pF
POWER SUPPLY
IDD
5
20
20
mA max
CS = RD = 0 V
ISS
100
100
µA max
CS = RD = 0 V
Power Dissipation
50
50
mW typ
Power Supply Sensitivity
±1/4
±1/4
LSB max
±1/16 LSB typ, V
DD = 4.75 V to 5.25 V,
(VREF(+) = 4.75 V max for Unipolar Mode)
NOTES
1Temperature Ranges are as follows: K Version = –40
°C to +85°C; B Version = –40°C to +85°C; T Version = –55°C to +125°C.
21 LSB = 19.53 mV for both the unipolar (0 V to +5 V) and bipolar (–2.5 V to +2.5 V) input ranges.
3See Terminology.
4Sample tested at +25
°C to ensure compliance.
5See Typical Performance Characteristics.
Specifications subject to change without notice.
–2–


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