AD7821 Ver la hoja de datos (PDF) - Analog Devices
Número de pieza
componentes Descripción
Lista de partido
AD7821 Datasheet PDF : 16 Pages
| |||
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 Version1
B, T Versions Unit
Comments
UNIPOLAR INPUT RANGE
Resolution2
8
8
Bits
Total Unadjusted Error3
±1
±1
LSB max
Minimum Resolution for which
No Missing Codes are Guaranteed 8
8
Bits
BIPOLAR INPUT RANGE
Resolution2
8
8
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 Noise3 –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, Tracking3
1.6
1.6
V/µs max
2.36
2.36
V/µs typ
REFERENCE INPUT
Input Resistance
VREF(+) Input Voltage Range
VREF(–) Input Voltage Range
ANALOG INPUT
Input Voltage Range
Input Leakage Current
Input Capacitance
1.0/4.0
VREF(–)/VDD
VSS/VREF(+)
1.0/4.0
VREF(–)/VDD
VSS/VREF(+)
kΩ min/kΩ max
V min/V max
V min/V max
VREF(–)/VREF(+)
±3
55
VREF(–)/VREF(+)
±3
55
V min/ max
µA max
pF typ
–5 V ≤ VIN ≤ +5 V
LOGIC INPUTS
CS, WR, RD
VINH
VINL
IINH (CS, RD)
IINH (WR)
IINL
Input Capacitance4
MODE
VINH
VINL
IINH
IINL
Input Capacitance4
2.4
2.4
V min
0.8
0.8
V max
1
1
µA max
3
3
µA max
–1
–1
µA max
8
8
pF max
Typically 5 pF
3.5
3.5
V min
1.5
1.5
V max
200
200
µA max
50 µA typ
–1
–1
µA max
8
8
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 Capacitance4 (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 Capacitance4
8
8
pF max
Typically 5 pF
POWER SUPPLY
IDD5
ISS
Power Dissipation
Power Supply Sensitivity
20
100
50
± 1/4
20
100
50
± 1/4
mA max
µA max
mW typ
LSB max
CS = RD = 0 V
CS = RD = 0 V
± 1/16 LSB typ, VDD = 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–
REV. B
Share Link: 